ASTM A572 Grade 50
The most widely used structural steel grade in the United States. 345 MPa (50 ksi) yield strength HSLA steel. Has largely replaced A36 for structural applications due to higher strength-to-weight ratio. Used for building frames, bridges, heavy equipment, and general structural fabrication.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A572 Grade 50 | — | REF |
| 🇪🇺 | EN | Europe | S355JR (approx) | 1.0045 | 85% |
Sources: ASTM A572/A572M, EN 10025-2
Chemical composition comparison (wt%)
Side-by-side: ASTM A572 Grade 50 (ASTM) (ASTM A572) vs S355JR (approx) (EN)
| Element | ASTM A572 Grade 50 (ASTM) | S355JR (approx) (EN) | Overlap |
|---|---|---|---|
| C | 0–0.23% | — | — |
| Si | 0–0.4% | — | — |
| Mn | 0–1.35% | — | — |
| P | 0–0.04% | — | — |
| S | 0–0.05% | — | — |
| V | 0–0.1% | — | — |
| Nb | 0–0.05% | — | — |
Mechanical properties
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 450 | MPa |
| Yield Strength | ≥ 345 | MPa |
| Elongation | ≥ 18 | % |
| Elastic Modulus | ≥ 200 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
ASTM A572 Grade 50 and S355JR (approx): 85% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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