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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, |
General purpose structural steel |
|
JIS G3101 |
||
|
A529/A529M |
A529 Grade 50(345), A529 Grade 55(380), |
|
|
ASTM A572 |
A572 Grade 42(290), A572 Grade 50(345), |
|
|
EN10025-2 |
||
|
ISO 630-3 |
S355N, S355M, S395N, S395M, S420N, |
Fine grain size structural steel |
|
EN10025-3 |
||
|
ISO 630-5 |
S355W Grade C, S355W Grade D, |
Atmospheric corrosion resistant |
|
EN10025-5 |
||
|
ISO 4951-2 |
Structural steel for construction |
|
|
G3138 |
||
|
ISO 4951-3 |
High yield strength TMCP structural steel |
|
|
EN10025-4 |
||
|
JIS G4053 |
SMn420,SMn433,SMn438,SMn443,SMnC420,SMnC433, |
Hot rolling of low alloy steel structure |