ASTM A572/A572M — Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel
Scope
HSLA structural shapes, plate, sheet piling and bar in Grades 42, 50, 55, 60 and 65 (290–450 MPa yield) micro-alloyed with niobium (columbium) and/or vanadium (Types 1–5). Thickness limits per grade; supplementary S5 (Charpy), S90/S91 (CE), S32 (fine grain). Adopted as SA-572 by ASME; A709 Grade 50 and A992 are the bridge and W-shape derivatives.
Grades covered by ASTM A572
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| A572 Grade 50 | K02303 | High-strength low-alloy (HSLA) columbium-vanadium structural steel | ≤ 0.23 | 290 | ≥ 415 | S355JR / S355J2, S355M / S355N, A992 |
Revision history and superseded standards
| Year | Change |
|---|---|
| 1966 | A572 first issued (Grades 42–65) |
| 1989 | Replaced A441 Mn-V steel |
| 2021 | A572/A572M-21 — current |
Supersedes: ASTM A441 (withdrawn 1989).
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