A572 Grade 50
The common US high-strength structural plate: 50 ksi (345 MPa) yield, 65 ksi (450 MPa) tensile.
Compared with S355 on its equivalents table.
- Yield strength ReH
- ≥ 345MPaConfirmed≤ 101.6 mm · up to 4 in.
- Tensile strength Rm
- ≥ 450MPaConfirmed
- Elongation after fracture A
- ≥ 18%Confirmedin 8 in. (200 mm)
- ≥ 21%Corroboratedin 2 in. (50 mm)
All values
Strength
Yield strength ReH
Upper yield strength guaranteed by the product standard (minimum).
| Condition | Value | Evidence |
|---|---|---|
| ≥ 345MPa | Confirmed |
Tensile strength Rm
Ultimate tensile strength. Product standards give a range or a minimum.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 450MPa | Confirmed |
Ductility
Elongation after fracture A
Minimum elongation; depends on gauge length and test direction.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 18% | Confirmed1 | |
| ≥ 21% | Corroborated1 |
Chemical composition
Show on the periodic tableA572 Grade 50, heat analysis, % by mass, maximum
| Element | Applies to | Max % | Evidence |
|---|---|---|---|
| C | all thicknesses | 0.23 | Corroborated |
| Mn | all thicknesses | 1.35 | Corroborated |
| Si | all thicknesses | 0.40 | Corroborated |
| P | all thicknesses | 0.030 | Single source |
| S | all thicknesses | 0.030 | Single source |
Columbium (niobium) and/or vanadium are added by type (1–5); the limits depend on the type ordered.
Listed as equivalent to
- S355 (EN 10025-2:2019) — Minimum yield 345 MPa (50 ksi), 10 MPa below S355; minimum tensile 450 MPa (65 ksi) with no upper limit. No impact test unless ordered as a supplement.
Sources here are public pages that reproduce ASTM A572/A572M. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.