ASTM A572 is a high-strength low-alloy steel plate that is utilized in a variety of structural applications. This specification is produced in Grades 42, 50, 55, 60 & 65, the grades representing the yield strength. Plates that are 4” and thicker are made to a 42 KSI yield, although material can be modified to reach the 50 KSI min yield.
A572 Grade 50 is dual certified to A709 Grade 50. Carbon Steels A709-50 material is stocked primarily in Flat Rolled Products, but is also available to a lesser extent in Structural and Bar Products. A709-50 ASTM A709 is fracture critical and covers the requirements for structural steel for bridges and other structures. Grade 50 steel of this specification requires a minimum yield strength of 50 ksi
ASTM A572 Chemical Composition:
|
| Grade 42 | Grade 50 | Grade 60 | Grade 65 |
| Carbon | 0.21% | 0.23% | 0.26% | 0.23-0.26% |
| Manganese | 1.35% | 1.35% | 1.35% | 1.35-1.65% |
| Phosphorus | 0.03% | 0.03% | 0.03% | 0.03% |
| Sulfur | 0.03% | 0.03% | 0.03% | 0.03% |
| Silicon | 0.15-0.4% | 0.15-0.4% | 0.4% | 0.4% |
The ASTM A572 plates and bars for applications in bolted, riveted and welded structures in bridges and buildings.

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