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Cold rolled ultra-high strength automotive steel

Definition: Baosteel names automotive steels with tensile strength of more than 1000 MPa as X-GPa® Steels for lightweight application.

Baosteel has committed to development and production of advanced automotive steel sheets, and vigorously developed X-GPa® Steels to meet the requirements of BIW lightweight and environmental protection in recent years. X-GPa® steels which are capable to significantly improve active safety performance and meanwhile achieve weight reduction are mainly used as key structural parts in BIW. It is an typical example of Baosteel green products to fulfill the road of sustainable development.

  • BaoQP® /Quenching and Partitioning Steel
  • QE /QP Steel with High Hole Expansion
  • DP /Dual Phase Steel
  • DH /Dual Phase High Ductility Steel
  • CP /Complex Phase Steel
  • CH /Complex Phase High Ductility Steel
  • MS /Martensite Steel
  • TWIP /Twinning Induced Plasticity Steel
  • PHS /Press Hardening Steel
About Image

X-GPa® Steels are intensively applied for structural parts and safety parts in automobile body as shown in Fig.
2. The application of X-GPa® Steels can effectively carry out weight reduction and improve passive safety, and ultimately enhance cost performance, Contributing to lower carbon emission in whole life cycle.


Fig 2 Typical Applications of X-GPa® Steels in Baosteel Car Body Electric Vehicle
[Baosteel Car Body EV(BCB EV®️ Pro)]


An exemplar of "Green" and "Low Carbon"

The application of X-GPa® steel on the car body can reduce the use of traditional steel. According to the 61% application of X-GPa® steel on BCB EV® Pro, the car body weight can be reduced by 54kg with a weight reduction ratio of 15%.


By the end of 2022, Baosteel has produced 3.17 million tons of X-GPa® steel in total, which has achieved a cumulative CO2 emission reduction of 4.16 million tons in the steel plate production stage and can achieve a cumulative CO2 emission reduction of 4.74 million tons based on 200000 km in 10 years in the automobile driving stage.


From steel plate manufacturing to automobile use, 8.90 million tons of CO2 can be reduced in the whole life cycle, which is about equivalent to the CO2 absorption of 5930 km2 of forest or 80.27 million fir trees (30 years old) in one year.


BaoQP® (Quenching and partitioning) series steel

Available grades of X-GPa® steel

Table 1 shows the available varieties of X-GPa® Steels in Baosteel. Among these products, the maximum tensile strength of cold rolled steel sheets reaches 1700 MPa. In addition, the maximum tensile strength of hot galvanized steel sheets and electro galvanized steel sheets reaches 1500 MPa and 1310 MPa, respectively, the maximum tensile strength of PHS reaches 2000MPa.

Table 1 Available grades of X-GPa® steel

Steel grade

Strength grade

Cold rolled

Electro galvanizing

Hot galvanizing

Hot galvanealing

Hot dip aluminum silicon

QP

980

-

1180

-

1500

O

-

-

-

-

QE

980

-

-

DP

980(low Y)

-

980(High Y)

-

1180

-

1310

O

-

-

1500

O

-

O

O

-

DH

980(low Y)

-

-

980(High Y)

-

-

1180

O

O

O

-

-

CP

980

-

-

-

1180

-

-

-

1300

O

-

O

-

-

CH

980

-

-

-

1180

-

-

-

1370

O

-

O

-

-

Mart

980

-

-

-

-

1180

-

-

-

-

1300

O

-

-

-

1400

-

-

-

-

1500

-

-

-

-

1700

-

-

-

-

TWIP

950

-

-

-

-

PHS

1000

-

-

-

1500

-

-

-

1800

-

-

-

2000

-

-

-


  • :Mass production
  • :steel is under developing, please consult our sales agents if have ordering demand
  • :N/A
  • Note: Baosteel steel grades in the table are similar to steel grades in some other standards (tensile strength difference is within 30 MPa). Although the desigations may be different, it is feasible to refer to each other. For example, DP980 and DP1000 are regarded as same steel grade. The data of DP980 is recommended as reference. CP980 and CP1000 are regarded as same steel grade, and it recommend to use the data of CP980 as reference. Similarly, QP1500 and QP1470 are regarded as same steel grade, QP1500 usually will be set as reference.

Microstructure: The microstructure is composed of ferrite, martensite and retained austenite with a volume fraction of 8-15%. (Fig.3)



Properties: Benefiting from the TRIP effect of retained austenite, BaoQP® steels exhibit quite high strain hardening capacity, and higher ductility and formability than other UHSS with same strength level. Coated BaoQP® possess good spot welding LME-resistance based on Baosteel innovative design criterion and manufacturing technique of low LME sensibility products.

Applications: BaoQP® steels are suited for the automotive structural and safety parts with complex shapes.

The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 2 Property standards of CR QP

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC600/980QP(E+Z)

600-850

980

15

HC600/980QP-EL(E+Z)

600-850

980

20

HC820/1180QP(E+Z)

820-1100

1180

8

HC820/1180QP-EL(E+Z)

820-1100

1180

14

HC1100/1470QP

1100-1400

1470

13


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of Rel apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range 0f 0.5-0.7mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Table 3 Property standards of HDG QP

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC600/980QPD+Z/ZF

600-850

980

15

HC600/980QP-ELD+Z/ZF

600-850

980

20

HC820/1180QDP+Z/ZF

820-1100

1180

8

HC820/1180QP-ELD+Z/ZF

820-1100

1180

14


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of Rel apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range 0f 0.5-0.7mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.

QP980 was the first ‘'world first" product of BaoSteel. and now BaoQP® already has been commercially supplied to vehicles in domestic market. Moreover, BaoQP® steels are suited for manufacturing structural and safety parts, such as A-pillar reinforcement., B-pillar reinforcement. and hinge-pillar reinforcement.

Product dimensions

QE (QP steel with high hole expansion ratio) series steel



Microstructure: By replacing the martensite and ferrite phases in the DP steels or the higher content of retained austenite in QP steels, the bainite (bainite/ferrite + retained austenite) obtained in this steel is beneficial to have better organization uniformity and local plastic deformation ability. This attributes to improved hole expansion performance and flanging formability. (Fig8 )

Properties: Based on the commercial QP steels, the re-designed microstructure shows a balance of high stretch-flangeability and good elongation.

Application: It can be utilized in the safety and structural parts or seat slide parts that requiring a relatively higher stretch-flangeability, higher bending performance and better elongation.

Table 4 Mechanical properties

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HER ,λ/%,≥

HC650/980QE

650-950

980

14

50

HC650/980QED+Z/ZF

650-950

980

14

50


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.

DP (Dual Phase) series steel

Technical characteristics

Microstructure: The microstructure is mainly composed of ferrite and martensite (Fig. 11). Martensite islands disperses in the ferrite matrix. The soft ferrite makes the material have better formability, and the hard martensite makes the material have high strength. The coordination of strength and plasticity is realized through dual phase, so as to improve the comprehensive properties of dual phase steel.

Properties: No yield extension, no room-temperature aging, low yield/tensile strength ratio, high strain hardening exponent and high bake hardening value.

Adopting the high corrosion resistance combined process independently developed by Baosteel, it can effectively remove the enrichment of surface alloy elements, optimize the surface quality, improve the corrosion resistance of cold rolling products, and improve the electrophoretic coating performance. Thus, a series of DP product family with high surface quality can be obtained, which have high corrosion resistance, good coating performance and advanced surface quality. These products can be extended to parts and components with high corrosion resistance requirements in the car body, such as threshold, seat beam, door crash beam, A-pillar and B-pillar, especially in parts like non-coating seat frame.

Application: DP steels are preferred to manufacture structural parts. The products with low yield ratio are widely applied to A-pillar reinforcement, B-pillar reinforcement. and other parts, while the products with high yield ratio are mainly used for underbody cross member, threshold, door anti-collision beam, seat frame, battery pack frame structure and other parts.



The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 5 Property standards of DP-CR

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC550/980DP(E+Z)

550-720

980

9

HC650/980DP(E+Z)

650-900

980

8

HC700/980DP(E+Z)

700-920

980

8

HC750/1180DP(E+Z)

750-1050

1180

7

HC820/1180DP(E+Z)

900-1200

1180

6

HC900/1180DP(E+Z)

950-1250

1180

5

HC950/1310DP(E+Z)

1000-1300

1310

5

HC1000/1470DP

1000-1300

1470

5


Table 6 Property standards of DP-HDG

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC550/980DPD+Z/ZF

550-730

980

8

HC650/980DPD+Z/ZF

650-900

980

6

HC700/980DPD+Z/ZF

700-900

980

6

HC740/1180DPD+Z/ZF

740-980

1180

5

HC820/1180DPD+Z/ZF

820-1150

1180

5

HC950/1310DPD+Z/ZF

950-1250

1310

5

HC1000/1470DPD+Z/ZF

1000-1300

1470

5


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS Z 2241. For the tensile axis of specimens, Coated is parallel to the rolling direction, Uncoated is vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • d:For thickness less than 0.5 mm, the minimum value of EL should be reduced by 4%.n-value should be determined by the strain range of 10-20%.If maximum uniform elongation is less than 20% but more than 12%, n-value should be determined by the strain range from 10% to end uniform elongation. If uniform elongation is less than 12%, n-value shall be reported as  uniform elongation equals true strain at uniform elongation.(nUE = εUE)
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Application cases





Microstructure: The microstructure is composed of ferrite, martenstite and retained austenite with a volume fraction of 5~10%.

Properties: Benefiting from the TRIP effect of retained austenite, DH steels exhibit higher cold formability and better crash behavior as compared to conventional DP steels at same strength level. DH steels also have low susceptibility to LME.

Applications: DH steels are suitable for the automotive structural and safety parts with complex shapes, such as Front sill, A/B pillar inner panel.

The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 7 Property standards of DH-CR and EG

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC420/780DH(E+Z)

420-550

780

19

HC550/980DH(E+Z)

550-700

980

15

HC700/980DH(E+Z)

700-850

980

14

HC850/1180DH

850-1050

1180

13


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS Z 2241 with the tensile axis parallel to the rolling direction.
  • c:When the specified nominal thickness is in the range 0f 0.5- 0.7mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Table 8 Property standards of DH-HDG

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC420/780DHD+Z

420-550

780

19

HC550/980DHD+Z

550-700

980

15

HC700/980DHD+Z

700-850

980

14

HC850/1180DHD+Z

850-1050

1180

8


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS Z 2241 with the tensile axis parallel to the rolling direction.
  • c:When the specified nominal thickness is in the range 0f 0.5- 0.7mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.



CP (Complex Phase) series steel

Technical characteristics



Microstructure: The microstructure mainly contains bainite and (or) ferrite, and usually has a few martensite, pearlite and/or retained austenite, as shown in Fig. 18.

with DP steel of the same strength grade), and better bending and flangeability with high energy absorption.

Application: Chassis suspension, bumper, seat rail etc.

The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 9 Property standards of CP-CR

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

λ%≥

HC780/980CP

780-950

980

7

50

HC900/1180CP

900-1100

1180

6

30

HC900/1300CP

900-1100

1300

5

30


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Table 10 Property standards of CP-HDG

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

λ%≥

HC780/980CPD+Z

780-950

980 -1140

7

40

HC900/1180CPD+Z

900-1100

≥1180

6

30

HC900/1300CPD+Z

900-1100

≥1300

5

30


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • d:For the hot-rolled base plate hot-dip galvanizing,usually, the thickness t≥2.0mm,please confirm the thickness and width range of product before official order.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.





Microstructure: The microstructure contains pure lower bainite with sub-micro carbides, leading to fine grains and uniformly distributed precipitations.

Properties: CH steel has higher ductility (i.e. total elongation) than conventional CP steel, while remaining good bendability, flangeability and high hole expansion ratio,in which CH1180(CR & Gl) has good anti-delayed-crack property and hot-dip galvanized CH1180-Gl has good anti-LME property as well.

Application: Seat rail and car body safety component with high requirements on bending, (or) flangeability as well as drawing forming, such as crossmember front floor, door beam, etc.

The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 11 property standards of CH-CR

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

λ%≥

HC780/980CH

780-950

980

11

30

HC900/1180CH

900-1150

1180

8

30

HC1000/1370CH

1000-1250

1370

6

30


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Table 12 Property standards of CH-HDG

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

λ%≥

HC780/980CHD+Z

780-950

980

11

30

HC900/1180CHD+Z

900-1150

1180

8

30

HC1000/1370CHD+Z

1000-1250

1370

6

30


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • c:When the specified nominal thickness is in the range of 0.5~0.7 mm, the minimum value of EL should be reduced by 2%.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.



MS (Martensite) series steel

Technical characteristics



Microstructure: Almost all martensite

Properties: high Yield Ratio, High tensile strength, Relatively low Elongation, Delayed cracking should be noted.

Application: MS high strength steel is preferred steel for simple cold stamping parts and Roll forming parts with a relatively single interface, such as Bumper, threshold reinforcing plate and the side door anti-collision rod etc.

The products can be supplied in accordance with the requirements of international standard such as EN, ASTM, JIS, also can be supplied in accordance with customer’s standard or requirement, or Baosteel standards.

Table 13 property standards of MS-CR

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

Recommended inner bending radius

HC700/980MS

700-960

980

4

6a

HC950/1180MS

950-1200

1180

4

8a

HC1030/1300MS

1030-1300

1300

4

8a

HC1150/1400MS

1150-1400

1400

3

8a

HC1200/1500MS

1200-1500

1500

3

8a

HC1350/1700MS

1350-1700

1700

3

8a


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for No.5 tensile specimens according to standard JIS 22241 with the tensile axis vertical to the rolling direction.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.



when demand exceed the scope of the above specifications and thickness is less than 2.3mm , it can be negotiated.

TWIP (Twinning Induced Plasticity) series steel

Technical characteristics



Microstructure: Full austenite

Properties: With good stamping strain distribution, theexcessive local deformation of TWIP steel can be avoided.

Application: lt is much easier for TWIP steel to form complex parts, such as structural and car safety components, which will lighter the weight and improve the crash safety.

Product Characteristics: Due to twinning induced plasticity (TWIP) effect, T WIP steel, exhibits sufficient elongation of over 50% at the tensile strength level of 1000MPa. With the strength level of UHSS and the formability of SEDDQ steels, TWIP steel shows excellent performance which any other automotive steels can not achieve. When commercially applied in the future, this kind of steel will remarkably contribute to the weight reduction of auto-parts and the improvement of automotive safety, as well as the revolution of components design. With cold-rolling TWIP steel successfully produced in June of 2012,Baosteel has become the manufacturer of this product and Baosteel has successfully produced GI TWIP steel in May 2014.

The products listed in the tables below can be supplied in accordance with EN, ASTM, JIS, and BaoSteel standards. Ordering according to customer’s standard or requirement is also available.

Table 14 property standards of TWIP-CR

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

n≥

HC450/950TW

450-600

950

47

0.35


  • a :If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.
  • b:Guaranteed for P17 tensile specimens according to standard GB/T 228 with the tensile axis parallel to the rolling direction.
  • Note: Please confirm the specifications of product before official order. The specifications are negotiable.
Purpose and case

TWIP steels exhibit the combination of ultra-high strength and ultra-high formability, which allows remarkable design modification and number reduction of auto-parts. According to their properties, TWIP steels are supposed to be suited for manufacturing structural and safety parts requiring both ultrahigh strength and very complex shape, such as bumper and B-pillar.




PHS (Press Hardening) series steel

Technical characteristics

The microstructure of 1500MPa grades press hardening steel in as-delivered condition is ferrite/pearlite matrix with small amounts of carbide or bainite. After press hardening, the metallographic structure is mainly martensite, and a small amount of ferrite, bainite or residual austenite is allowed under the premise that the strength meets the requirements.

Baosteel PHS includes coating free and aluminum silicon coating. The family products can achieve different strength levels through composition design optimization. Compared with PHS without coating, Al - Si coating has the advantages of reducing shot peening process, avoiding decarbonization of steel surface and improving corrosion resistance of parts.

Microstructure: Before press hardening, the substrate is mainly ferrite + pearlite, after press hardening, mainly martensite (Fig.29).



Properties: Press hardening process is to heat blank above austenitizing temperature, and hold for a certain time, and then die quenching to form martensitic. Press hardening can achieve high strength, high toughness of parts, and effectively improve the anti-collision performance of parts. Press hardened steel is mainly used in the body structure, especially in the safety structure to prevent intrusion.

Press hardening process window: Due to the characteristics of the aluminum silicon coating itself, the coating will occur alloying diffusion in the press hardening process. If the heating time or temperature is not appropriate, the coating structure will change, thus affecting the coating and welding performance of parts. The typical hardening process window recommended by Baosteel is shown in Fig.



Laser Welding Process: Baosteel adopts laser wire filling technology which is developed by Baosteel to produce hotformed tailor welded blanks with Al Si coating. The product quality is stable and controlled. With such technology, coating ablation is abandoned, the production cost of tailor welded blanks is reduced, the production efficiency is improved, and the products are more competitive in the market. Baosteel can provide tailor welded blanks or tailor welded hot stamping parts with Al Si coating according to customers' requirements.



The products can be supplied in accordance with the requirements of international standard such as EN, ASTM, JIS, also can be supplied in accordance with customer’s standard or requirement, or Baosteel standards.

Table 15 Typical mechanical properties of PHS under delivery condition

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC340/460HS(B500HS)

320

400

15

HC340/460HS +AS(B500HS+AS)

320

400

15

HC370/550HS(B600HS)

340

450

15

HC370/550HS +AS(B600HS+AS)

340

450

15

HC800/1000HS(B1000HS)

300

600

10

HC800/1000HS +AS(B1000HS+AS)

300

600

10

HC950/1300HS(B1500HS)

280

450

20

HC950/1300HS +AS(B1500HS+AS)

300

500

17

HC1100/1700HS(B1800HS)

300

500

16

HC1100/1700HS +AS(B1800HS+AS)

300

500

15

HC1200/1800HS(B2000HS)

300

500

15

HC1200/1800HS +AS(B2000HS+AS)

300

500

14


Table 16 Typical mechanical properties of PHS after quenching

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

EL(c),A 50mm,(%)≥

HC340/460HS(B500HS)

392

519

20

HC340/460HS +AS(B500HS+AS)

HC370/550HS(B600HS)

451

641

18

HC370/550HS +AS(B600HS+AS)

HC800/1000HS(B1000HS)

877

1085

9.5

HC800/1000HS +AS(B1000HS+AS)

HC950/1300HS(B1500HS)

1067

1565

7

HC950/1300HS +AS(B1500HS+AS)

HC1100/1700HS(B1800HS)

1213

1830

5.5

HC1100/1700HS +AS(B1800HS+AS)

HC1200/1800HS(B2000HS)

1345

2020

5.5

HC1200/1800HS +AS(B2000HS+AS)


X-GPa® steel processing capacity

In order to meet the shear processing requirements of X-GPa® steel and ensure the processing quality and delivery requirements of X-GPa® steel materials, the processing and distribution system of the Baosteel Marketing & Sales Center (Shanghai Baosteel International Economic&Trading Co., Ltd.) is equipped with corresponding processing capacity. It has 30 production lines with a processing capacity of 980MPa and above, with a total designed capacity of 1.65 million tons. Among them, there are 16 slitting line, cut-to-length line or blanking lines with a processing processing capacity of 920,000 tons of over 980MPa. Baosteel is equipped with 1180MPa slitting capacity in each region, and the demand above 1180MPa is extended from Shanghai to the whole country to provide processing and distribution services.

The steel service centers of Baosteel in Shanghai have been formed X-GPa® steel shear and blanking processing capacity of 450,000 tons. In order to meet the steel shear and blanking processing needs of over GPa ultra-high strength steel. Shanghai high strength steel company equipped with 1800MPa longitudinal cutting unit and 1500MPa transverse cutting unit, Baosteel Arcelor has 1200MPa blanking processing capacity. Outside Shanghai, Changchun Baosteel, Liuzhou Baosteel Autoparts, YantaiBao-Mit, Nanjing baosummit, has 1180- 1470MPa blanking capacity, which can meet requirements of X-GPa® steel blanking processing.

The 1700MPa Martensitic steel straightening line is under construction, and will form a processing capacity in Shanghai by 2024.


 

Parameters of 13 slitting lines

Parameters of 3 Cut-to-Length(including pendulum shear)lines

Parameters of 14 Blanking lines

Cutting Strenght Max

980-1800MPa

980-1500MPa

980-1470MPa

Yield Strenght Max

780-1500Mpa

750-1200Mpa

700-1150MPa

Coil Weight Max

25-30t

30t

20-25t

Entrance Width

300-1650mm

300-1650mm

300-1850mm

Exit Width

30-1650mm

-

-

Cutting Length

-

300-6000mm

-

OD Max

2100mm

2100mm

-

OD Min

900mm

900mm

 

ID

Φ508 or 610mm

Φ508 or 610mm

Φ508 or 610mm

Thickness Range

0.5-6.0mm

0.5-4.0mm

0.5-3.2mm

Table size

-

-

4500x2500mm

Blanking step distance

-

-

220-4000mm

Clamping height

-

-

1100mm

SPM values

-

-

10-80

Stacking Weight Max

-

5t

4-5t

Stacking Height Max

-

750mm

700mm(including maerial shelt)

Annual Capacity

820,000T

150,0000T

680,000T

Hot rolled wheel steel

Wheel steels consist of plain steel type, the high strength low alloy (HSLA) type and advanced high strength (AHS) type. The plainsteels are strengthened by solid solution strengthening and have low strength, excellent weldability and formability. HSLA steels arestrengthened by Nb and Ti with high strength, good weldability, excellent cold formability. AHs steels are mainly strengthened byphase transformation such as Dp steels with low yield ratio and FB steels with hieh hole expansion ratio with High strength, goodweldability, low yield ratio, excellent cold formability, high fatigue resistance.

About Image

PROCESS AND DELIVERY CONDITION

Table 4 Mechanical properties

The wheel steels are killed in oxygen converter. Aftersecondary refining and continuous casting, the slabs arereheated and rolled into coil in TMCP rolling process.

Delivery condition

The wheel steels may be delivered in hot-rolled coils.


PRODUCT RANGE OF DIMENSIONS


Steel Type

Thickness(mm)

Width(mm)

Plain Steel

1.6-14.0

800-1400

HSLA

1.6-14.0

800-1400

DP Steel

1.6-6.0

800-1400

FB Steel



COMPOSITION WT%


Steel Type

Steel Grade

C

Si

Mn

P

S

Alt

Plain Steel

B330CL

≤0.10

≤0.30

≤0.80

B380CL

≤0.12

≤0.30

≤1.50

B420CL

≤0.12

≤0.30

≤1.50

B450CL

≤0.10

≤0.30

≤1.50

HSLA

B500CL

≤0.12

≤0.30

≤1.60

≤0.025

≤0.020

≥0.01

B530CL

≤0.12

≤0.30

≤1.60

B550CL

≤0.12

≤0.30

≤2.0

B600CL

≤0.15

≤0.30

≤2.0

B650CL

≤0.15

≤0.50

≤2.0

DP Steel

BR330/580DP

≤0.23

≤2.0

≤3.30

≤0.09

≤0.015

≥0.015

BR380/650DP

≤0.23

≤2.0

≤3.30

BR400/700DP

≤0.23

≤2.0

≤3.30

BR450/780DP

≤0.23

≤2.0

≤3.30

FB Steel

BR300/450HE

≤0.18

≤1.20

≤2.0

≤0.05

≤0.010

≥0.015

BR440/590HE

≤0.06

≤1.00

≤2.0

≤0.03

≤0.010

≥0.02

BR600/780HE

≤0.18

≤1.20

≤2.0

≤0.05

≤0.010

≥0.015



MECHANICAL PROPERTIES


Steel Type

Steel Grade

YS(a,b),RP(0.2),MPA

TS,Rm,MPa≥

El%

λ%≥

Plain Steel

B330CL

≥225

330-430

≥33

 

B380CL

≥235

380-480

≥28

 

B420CL

≥290

420-520

≥28

 

B450CL

350-470

450-570

≥28

 

HSLA

B500CL

400-530

500-620

≥26

 

B530CL

430-560

530-650

≥24

 

B550CL

450-580

550-680

≥24

 

B600CL

500-630

600-750

≥22

 

B650CL

550-680

650-800

≥20

 

DP Steel

BR330/580DP

330-470

580-700

≥19

 

BR380/650DP

380-550

≥650

≥16

 

BR400/700DP

400-550

≥700

≥15

 

BR450/780DP

450-610

780-900

≥14

 

FB Steel

BR300/450HE

300-400

450-600

≥24

≥80

BR440/590HE

440-600

590-700

≥15

≥75

BR600/780HE

600-760

780-900

≥12

≥50


a. lf the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of Rel apply.

MICROSTRUCTURES

BASIC CHARACTERISTIC CURVE

FORMING PROCEDURE

Baosteel's wheel steel has good formability and can meet various manufacturing process requirements such as stamping, spinningand rolling. Baosteel has complete forming and performance analysis software, and has servo press machine, power spinning machineiatigue testing machine and so on. We can provide our users with material performance analvsis, material selection optimizationforming CAE analysis, wheel performance CAE analysis and other technical support work, and cooperate with users to complete newproducts, new process development and sample trial production.

WELDING PROCEDURE

Butt welding is the main welding method for joining rims, which includes resistance butt welding and flash butt welding.

The resistance butt welding could be classified by welding pressure, direction of current, frequency of current and so on.

The flash butt welding could be classified by preheating or no, direction of current, mode of current and so on.

Compared with flash butt welding, the process of resistance butt welding is usually implemented for the rim with smaller cross sectionbut its process is more simple and the surface of joint is more smooth with smaller burs. On the contrary, the flash butt welding canachieve the joint with larger cross section under a smaller power. Meanwhile, the requirement of clamping accuracy for flash butwelding is lower. However, the welding spatter,slag inclusion, smoke of welding and environmental pollution is more serious for flashbutt welding.

For the butt welding of the rim, Baosteel Co. Ltd has a lot of experience. We have perfect detecting methods and equipment to detectthe quality of the joint (as shown in Fig.1).

APPLICATIONS

Hot-rolled Automotive Steel Sheets

With the increasing awareness for safety, energy saving andenvironment protection, there is an une for high strengthsteel for automotive. Hot-rolled high strength steel sheetswhich are widely used in wheel, beam, carriage, axle, driveshaft, chassis,suspension and other important parts, canprovide great potential for weight reduction.

Baosteel began to develop hot-rolled high strength steelfor automobile in 2004 and successfully developed varioustypes of high strength steel which can satisfy differentperformance requirements, such as:
①:550-700MPa low alloy high strength steels in yieldstrength with good formability and weldability, whichcan be used in beam, carriage, drve shaft and otherstructural parts of automobiles.
②450-650MPa wheel steels in tensile strength.
③600MPa grade steel for axle housing in tensilestrength.Advanced high strength steel 4440-780MPa highhole expansion steels, 580 and 780MPa dual-phasesteels,580 and 780MPa TRlP steels
④formability and high anti-fatigue property, which isapplicable to parts with complex shapes.
⑤Heat treated ultra high strength steel and wearrest steel.

Baosteel adopts advanced smelting techndlogy to gainpure steel with low inclusion. Precisely controlled rolling andcontrolled cooling technologies are used to obtain expectedmicrstructures to meet application requirements

Baosteel hot-rolled high strength steels for automobiles arewidely used in car and truck factories, auto parts factoriesand car tuning shops. High strength steel sheets makeit possible to reduce auto body weight, which therebycontributes to improved manufacturing cost.

Commercial Vehicles Beam Steels

Beam structure bears the main loads of the commercial vehicles. The beam steels must show good strength and toughness, and high fatigue property. From the forming methods, commercial vehicles beams can be divided into stamping beam, rolling beam, and welding beam. For stamping beam and rolling beam, the steels should have high cold forming performance. For welding beam, the steels should show good weldability.



Baosteel beam steels mainly include microalloyed high strength beam steels and ultra high strength beam steels, with a highest yield strength of 960MPa

High strength beam steels reach the highest yield strength level of 700MPa. The steels not only have good purity, excellent toughness, and good fatigue performance, but also The steels are suitable for stamping beam, rolling beam, and welding beam.

Ultra high strength beam steels reach the highest yield strength level of 960MPa, delivered by heat treatment. The steels show high purity, excellent toughness, good fatigue performance, good weldability, excellent flatness and surface quality. The steels are suitable for welding beam.

Mechanical Properties

Classification

Level,MPa

Typical Grades

Tensile Test

Diameter for Bending Test

ReH,MPa

Rm,MPa

%,A

Common beam steel

355

B510L

≥355

510-630

≥24

D=0.5a,180°

High strength beam steel

500

B550L,QStE500TM

≥500

550-700

≥17

D=1.5a,180°

550

B600L,QStE550TM

≥550

600-760

≥16

D=1.5a,180°

600

B650L,QStE600TM

≥6050

650-820

≥15

D=0.5a,180°

650

B700L,QStE650TM

≥650

700-880

≥14

D=2a,180°

700

B750L,QStE700TM

≥700

750-950

≥13

D=2a,180°

B750LD

≥700

750-950

≥13

D=2a,180°

Ultra high strength beam steel

800

B850LE

≥800

≥850

≥12

D=4a,90°

960

B980LE

≥960

≥980

≥12

D=6a,90°


Available Size

Thickness,mm

Width,mm

Length,mm

1.5-12

900-1800

2000-13000


Application Case

A lightweight design for welding beam of a flatbed truck
Welding beam of ultra high strength steel, specified load 40 tons
Material: ultra high strength steel B980LE replace high strength steel B750L
After lightweight design, weight decreases from 840kg to 600kg.
The weight reduction is 240kg, and weight loss rate is 28.6%

Structure

Original Design (B750L)

New Design (B980LE)

Upper wing plate

8mm

4.5mm

Lower wing plate

10mm

6.5mm

Vertical plate

6mm

4.5mm

A lightweight design for stamping beam of a heavy truck

Stamping beam of high strength steel, specified load 30-55 tons
Material: high strength steel QStE700TM replace B510L
After lightweight design, weight decreases from 686.5kg(7+5mm double beams) to 469.5kg (8mm single beam).
The weight reduction is 217kg, and weight loss rate is 31.6%

Wheel Steels

Product Characteristics

Wheel steels consist of the high strength low alloy (HSLA) type and advanced high strength (AHS) type. HSLA steels are strengthened by Nb and Ti with high strength, good weldability, excellent cold formability. AHS steels are mainly strengthened by phase transformation such as DP steels with low yield ratio and FB steels with high hole expansion ratio with High strength, good weldability, low yield ratio, excellent cold formability, high fatigue resistance.

Microstructures

Mechanical Properties

Steel Type

Steel Grade

YS,RP(0.2),MPA

TS,Rm,MPa

El%

λ%≥

HSLA

B500CL

380-500

500-620

≥26

 

B550CL

450-570

550-680

≥24

 

B600CL

500-620

600-750

≥22

 

B650CL

550-680

650-800

≥20

 

DP Steel

BR330/580DP

330-470

≥580

≥19

 

BR450/780DP

450-610

≥780

≥14

 

FB Steel

BR300/450HE

300-420

≥450

≥24

≥80

BR440/590HE

440-620

≥580

≥14

≥75

BR600/780HE

600-800

≥780

≥12

≥55


a. If the yield point is not pronounced, the values of Rp0.2 apply. Otherwise, the values of ReL apply.

Available Specification

Steel Type

Steel Grade

Thickness

Width mm

HSLA

B500CL

1.6-14.0

800-1400

B550CL

1.6-14.0

800-1400

B600CL

1.6-14.0

800-1400

B650CL

1.6-14.0

800-1400

DP Steel

BR330/580DP

1.6-6.0

800-1400

BR450/780DP

1.6-6.0

800-1400

FB Steel

BR300/450HE

1.6-6.0

800-1400

BR440/590HE

1.6-6.0

800-1400

BR600/780HE

1.6-6.0

800-1400


Steel for Truck Body

Truck body or mixer tank body in service will withstand wear,severe loading impact, strain load condition, with overload control more and more strict, highway vehicles will face more and more urgent demand for lightweight, Baosteel has developed a series of truck body, high strength hot rolled steel plate and wear-resistant steel plate to meet the user’s requirement of lightweight design, easy processing, longevity and durability, low cost and so on.

The dump truck body adopts wear-resistant steel instead of ordinary steel structure, can reduce the body weight 30-50%. Truck body made by wear-resistant steel,perform high strength and high rigidity, anti impact dent with good toughness, abrasion resistance and long service life. Baosteel can provide package of technical support, such as material recommending, processing, welding, and the lightweight design as well.

Truck Body Steels and Typical Application

Type

Grade

Product Features

HSLA

BW300

Low grade,apply to road dump truck body,etc.

BW
Wear resistent steel

BW450
BW500

High grade,apply to mining dump truck body,etc.

BW300TP

Easy forming wear resistent steel,apply to concrete mixer tank body,etc.

XT

High strength steel

B650XT

B700XT

B800XT

High strength steel plate, with good plasticity,easy processing, easy welding, high strength and durable, suitable for the modification of the truck body cold formed tube, side panels, frame structure, crashproof beam and so on.


XT Mechanical Properties

Grade

Re,MPa

Rm,MPa

A,%

180°bend

B650XT

≥600

≥650

≥11

d=2a

B700XT

≥620

≥700

≥11

d=2a

B800XT

≥700

≥800

≥11

d=2a


Application Case



1. Lighweight semi trailer manufactured with B700XT

2. Italy a user using BW450 wear resistant steel manufacturing mining dump truck body.

3. Road dump truck body manufactured by BW300 wear resistent steel.

4. Concrete mixer drum using BW300TP, exported to Southeast Asia market.

High Strength Steel for Shaft Tube and Axle

Applications

Baosteel has developed a series of high strength cold forming and hot stamping hot-rolled steelfor Shaft Tube and Axle, which provides a variety of solutions for the lightweight of axle housing.

Cold forming axle housing steel with high strength, easy forming, good welding performance and high production efficiency, suitable for the production of light truck axle housing.

Hot stamping steel axle housing is suitable for hot stamping forming process, its special designed microstructure ensured the high strength and good fatigue performance after hot stamping. The steel is mainly used in thick axle housing of heavy truck for the purpose of reducing weight, and has been certified by a famous German commercial vehicle enterprise.

Products and Mechnical Properties

Steel Grade

Re,MPa

Rm,MPa

A,%

180°bend

Field of Application

B600QZR

≥550

600-760

≥14

1.5a

Steel for Shaft Tube

B700QZR

≥600

700-850

≥13

1.5a

B750QZR

≥700

750-900

≥13

1.5a

B440QK

≥295

≥440

≥34

1a

Cold Forming for Axle

B500QK

≥460

≥500

≥19

1a

B600QK

≥550

≥600

≥15

1.5a

B700QK

≥600

≥700

≥14

2a

BQT800(Hot-rolled Plate)

BQT800(Hot-stamping housing)

≥600

≥460

≥700

≥550

≥12

≥21

-

-

Hot Stamping for Axle

Microstructure

Product Range of Dimensions

Application

Thickness,mm

Width,mm

Length,mm

Steel for Shaft Tube

2-8

900-1800

2000-12000

Cold forming axle housing

2-8

900-1800

2000-12000

Hot stamping axle housing

8-14

900-1800

2000-12000


Application Case

Baosteel recommended axle housing user to use BQT800 instead of Q420 to produce 13tons heavy truck axle housing, and the hot stamping steel plate thickness decreased from 14mm to 11mm, the whole axle housing weight loss by 20% (21KG).
Baosteel provides full-service including the simulation design, hot forming process, welding and fatigue test.

Special Steel for Automobile

Products Overview

Hot rolled special steel in Baosteel includes carbon structural steel, alloy structural steel, carbon tool steel, sping steel etc. Hot rolled special steel have a wide range of applications, they are used in saw blades, automobile parts, engineering machinery, oilers, chemicl energy and other fieleds. At presently, Baosteel has formed a full range of hot-rolled special steel, and greatly meet the needs of our customers.

Product Characteristics

High purity: the strictly controlled refining and continuous casting process makes steel more pure and more uniform, and greatly improved the service life of the product.

High precision: the precisely controlled by the world class hot mill plant, the microstructure and the tolerance of the products satisfy even the most stringent requirements.

Multiple delivery conditions: including hot-rolled, annealing, quenching and tempering conditions, greatly satisfy the needs of users.

Main Varieties and Grades

Product Categories

Main Standards

Steel Grade

Applications

Carbon steel for machine structure

JIS

JIS standard

S15C-S55C

Various type of mechanical parts,including automovile parts,chain,friction plate and used for cold-rolled.

SAE

SAE1010-SAE1070

EN

European standard

C10-C75

Carbon tool steel

JIS

JIS standard

SK5,SK4

Saw,blade,kinfe,agricultural machine parts and for clod-rolled use.

SAE

SAE standard

SAE1074,SAE1078

EN

European standard

C80

Alloy steel for structural use

JIS

JIS standard

SCM,SNCM

Various type of automobile parts,chain,seat adjustment systems,clutch plates and used for clod-rolled.

ASTM

ASTM standard

SAE4130,SAE4140

EN

16MnCr5,34CrMo4,42CrMo4

Alloy tool steel

JIS

JIS standard

SKS51

Cutlery,saw,circular saws and for cold-rolled steel strip.

EN

European standard

75Cr1,80CrV2/8CrV,75Ni8

Spring steel

JIS

JIS standard

SUP6,SUP9

Various elastic parts in winding apparatus,etc.

EN

European standard

50CV4/51CrV4,58CrV4,GB

GB

27SiMn,65Mn,60Si2MnA.62Si2MnA

GB

15CrMo,12Cr1MoV

ASME

15CrMo,12Cr1MoV


Application Case
Special steel plate for automobile power system

The power system parts needs high reliability of material, for example engine rocker steel 16MnCr5 and engine flywheel steel SAE1050. The manufacturing process of complex parts involves complex forming, so high demands on high purity and stability properties are required.

Special steel plate for automobile transmission system

The clutch is the core of the transmission sytem and diaphragm spring is the important component of cluth. Spring steel provided by Baosteel, for example 50CrV4 and 58CrV4, has been widely used in various types of clutch, including traditional AT and Volkswagen DSG dual clutch gearbox, the fatigue life of the products reach the international advanced level.

According to statistics, a car contains ablut 70-100 kinds of fine-blanking parts. They are existed in the transmission system, braking system, seat system, air conditioning systems, exhaust systems, airbans and other key components. Baosteel as a pioneer in China firstly developed a aeries of fine-blanking steel, which greatly promoted the upgrading of domestic fine blanking industry technology.

Hot forming Steel for Automobile

Product Features

Hot forming Steel for Automobile can reach the strength above 1200MPa by utilizing metal elongation property under high temperature (Austenite) and rapid cooling (quenching) in die.

Chemical Composition (Heat Analysis) (%)

Grade

C

Si

Mn

Nb+Ti

BR1200HS

≤0.3

≤1.2

≤2.0

≤0.10

BR1500HS

≤0.3

≤1.2

≤2.0

≤0.10


Mechanical Properties

Grade

Status

Rpl(MPa)

Rm(MPa)%

A,L0-80mm()

BR1200HS

Hot-rolled

350-630

≤700

≥18

After heat treatment

900-1200

≤1200

≥8

BR1500HS

Hot-rolled

≥280

420-800

≥15

After heat treatment

950-1250

1300-1800

≥6


Available Specifications and Sizes

Grade

Status

Rpl(MPa)

BR1200HS

1.8-6.0

800-1850

BR1500HS

1.8-6.0

800-1850


To those requirements out of the spec range, trial production can be arranged based on further discussion and agreement.

Typical Applications

Widely used in B pillar, side intrusion beam and bumper, etc.