A572 Gr 50 is high strength low alloy (HSLA) structural steel. It is widely used in engineering structures, such as the construction of steel structures, construction machinery, mining machinery, heavy-duty trucks, bridges, pressure vessels. A572 Gr 50 steel has good weldability and toughness, and it is especially applied for the architectural and engineering mechanical components.
A572 Gr 50 HSLA structural steel plate finds its best application where there is need for more strength per unit of weight. Less of A572 Gr 50 material is needed to fulfill given strength requirements than is necessary with regular carbon steels. A572 Gr 50 HSLA steel is a Columbium-Vanadium steel that offers a minimum yield of 50,000 PSI.
A572 Gr 50 HSLA structural steel plate chemical composition:
| ASTM A572 | C max | Mn max | P max | S max | Si max |
| A572 Gr 50 | 0.23 | 1.35 | 0.04 | 0.05 | 0.4 |
A572 Gr 50 HSLA structural steel plate mechanical property:
| ASTM A572 | Yield strength Mpa | Tensile strength Mpa | Elongation % in 200mm | Elongation % in 50mm |
| A572 Gr 50 | 345 | 450 | 18 | 21 |
A572 Gr 50 HSLA structural steel equivalent grades:
| EU | Germany | Japan | France | China | Inter | India |
| EN | DIN,WNr | JIS | AFNOR | GB | ISO | IS |
| S355JR | ST52-3 | SM490A | E36-2 | Q345B | E355C | IS961 |
| SS490 | FE510B |
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