A572 steel
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ASTM A572 steel is a common high strength, low alloy (HSLA) structural steel used in the United States.[1] A572 steel properties are specified by ASTM International standards.[2]
A572 steel has five different grades: 42, 50, 55, 60 and 65.[2] Each of these grades differ in their mechanical properties and chemical composition.
Chemical Composition
| A572 Grade | Carbon | Manganese | Phosphorus | Sulfur | Silicon |
|---|---|---|---|---|---|
| Grade 42 | 0.21% | 1.35% | 0.030% | 0.030% | 0.15-0.40% |
| Grade 50 | 0.23% | 1.35% | 0.030% | 0.030% | 0.15-0.40% |
| Grade 55 | 0.25% | 1.35% | 0.030% | 0.030% | 0.15-0.40% |
| Grade 60 | 0.26% | 1.35% | 0.030% | 0.030% | 0.40% |
| Grade 65 Less Than 1/2" Thick | 0.26% | 1.35% | 0.030% | 0.030% | 0.40% |
| Grade 65 Over 1/2" to 1 1/4" Thick | 0.23% | 1.65% | 0.030% | 0.030% | 0.40% |
Material Properties
| A572 Grade | Yield Point (KSI) [MPa] | Tensile Strength (KSI) [MPa] | Min. 8” Elongation % |
|---|---|---|---|
| Grade 42 | 42 [290] | 60 [414] | 20 |
| Grade 50 | 50 [345] | 65 [448] | 18 |
| Grade 55 | 55 [379] | 70 [483] | 17 |
| Grade 60 | 60 [414] | 75 [517] | 16 |
| Grade 65 | 65 [448] | 80 [552] | 15 |