ASTM A572 Grade 50: High-Strength Low-Alloy Structural Steel
ASTM A572/A572M · Published: 2026-06-03 · Updated: 2026-06-03
ASTM A572 Grade 50 is a high-strength low-alloy (HSLA) structural steel with a 345 MPa minimum yield — approximately 38% stronger than A36. It is the standard material for bridge construction, heavy structural frames, and rolled sections where...
ASTM A572 Grade 50 is a high-strength low-alloy (HSLA) structural steel with a 345 MPa minimum yield — approximately 38% stronger than A36. It is the standard material for bridge construction, heavy structural frames, and rolled sections where weight savings justify the modest cost premium.
Quick Facts
| Category | Carbon Steel |
| Standard | ASTM A572/A572M |
| Density | 7.85 g/cm³ |
| Yield Strength | 345 MPa (50 ksi) |
| Tensile Strength | 450-620 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Can A572 Grade 50 replace A36?
Yes, A572 Gr 50 can replace A36 in most structural applications, offering weight savings through the use of thinner sections. However, the higher strength comes with reduced ductility — A572 Gr 50 elongation is typically 18% vs A36's 20%.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu