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Low alloy high strength steel bar

Low alloy structural steel bars refer to alloy structural steel bars whose total alloy composition is less than 5%. The carbon content of this steel is similar to that of low carbon steel. It is mainly strengthened by a small amount of alloy elements to improve toughness and weldability. Its strength is much higher than that of carbon steel with the same carbon content. It is widely used in pressure vessels, chemical equipment, boilers, bridges, vehicles, ships and large steel structures. The alloying elements manganese, silicon and molybdenum can cause solid solution strengthening. Vanadium and niobium can refine grains and improve toughness. Molybdenum can not only improve the hardenability and obtain bainite structure, but also improve the thermal strength.

JW Steel's supply size for this kind of steel bar is 20-250mm in diameter, and the main grades are as follows:


Standard

Grade

Type

ISO 630-2

S355 Grade B, S355 Grade C,S355 Grade D,
S450 Grade C

General purpose structural steel

JIS G3101

SS490,SS540

A529/A529M

A529 Grade 50(345), A529 Grade 55(380),

ASTM A572

A572 Grade 42(290), A572 Grade 50(345),
A572 Grade 55(380), A572 Grade 60(415),
A572 Grade 65(450)

EN10025-2

S355JR, S355J0, S355J2, S355K2, S450J0

ISO 630-3

S355N, S355M, S395N, S395M, S420N,
S420M, S460N,S460M, S500N, S500M

Fine grain size structural steel

EN10025-3

S355N, S355NL, S420N, S420NL, S460N,
S460NL

ISO 630-5

S355W Grade C, S355W Grade D,
S355W Grade D1,S355WP Grade C,
S355WP Grade D

Atmospheric corrosion resistant
structural steel

EN10025-5

S355J0WP,S355J2WP, S355J0W,
S355J2W, S355K2W

ISO 4951-2

E355CC,E355DD,E420CC,E420DD,
E460CC,E460DD

Structural steel for construction

G3138

SNR400B, SNR490B,SNR400A

ISO 4951-3

E355M,E355ML,E420M,E420ML,E460M,E460ML

High yield strength TMCP structural steel

EN10025-4

S355M, S355ML, S420M, S420ML, S460M, S460ML

JIS G4053

SMn420,SMn433,SMn438,SMn443,SMnC420,SMnC433,
SCr415,SCr420,SCr430,SCr435,SCr440,SCr445,SCM415,
SCM418,SCM420,SCM421,SCM425,SCM430,SCM432,
SCM435,SCM440,SCM445,SCM822,SNC236,SNC415,
SNC631,SNC815,SNC836,SNCM220,SNCM240,
SNCM415,SNCM420,SNCM431,SNCM439,
SNCM447,SNCM616,SNCM625,SNCM630,
SNCM815,SACM645

Hot rolling of low alloy steel structure
for machinery


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