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.
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)]
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.
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.
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 |
● |
- |
- |
- |
● |
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.
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 |
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 |
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.
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.
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 |
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.
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 |
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 |
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.
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 |
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 |
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.
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 |
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 |
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.
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 |
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 |
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.
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 |
when demand exceed the scope of the above specifications and thickness is less than 2.3mm , it can be negotiated.
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.
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 |
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.
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.
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 |
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) |
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 |
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.
The wheel steels are killed in oxygen converter. Aftersecondary refining and continuous casting, the slabs arereheated and rolled into coil in TMCP rolling process.
The wheel steels may be delivered in hot-rolled coils.
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 |
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 |
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.
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.
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).
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.
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.
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° |
Thickness,mm |
Width,mm |
Length,mm |
1.5-12 |
900-1800 |
2000-13000 |
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 |
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 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.
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.
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 |
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.
Type |
Grade |
Product Features |
HSLA |
BW300 |
Low grade,apply to road dump truck body,etc. |
BW |
BW450 |
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. |
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 |
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.
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.
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 |
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 |
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.
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.
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.
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 |
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.
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 can reach the strength above 1200MPa by utilizing metal elongation property under high temperature (Austenite) and rapid cooling (quenching) in die.
Grade |
C |
Si |
Mn |
Nb+Ti |
BR1200HS |
≤0.3 |
≤1.2 |
≤2.0 |
≤0.10 |
BR1500HS |
≤0.3 |
≤1.2 |
≤2.0 |
≤0.10 |
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 |
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.
Widely used in B pillar, side intrusion beam and bumper, etc.