ASTM A514 Grade B: Quenched-and-Tempered High-Strength Structural Steel Plate
ASTM A514/A514M · Published: 2026-06-03 · Updated: July 2026
ASTM A514 Grade B is a quenched-and-tempered alloy steel plate with 690 MPa minimum yield — nearly 3× the strength of A36. It is specified for heavy equipment (crane booms, mining truck frames), pressure vessels requiring high strength-to-weight,...
ASTM A514 Grade B is a quenched-and-tempered alloy steel plate with 690 MPa minimum yield — nearly 3× the strength of A36. It is specified for heavy equipment (crane booms, mining truck frames), pressure vessels requiring high strength-to-weight, and structural nodes where section thickness must be minimized. Welding requires low-hydrogen practices and careful heat input control.
Quick Facts
| Category | Alloy Steel |
| Standard | ASTM A514/A514M |
| Density | 7.85 g/cm³ |
| Yield Strength | 690 MPa (100 ksi) |
| Tensile Strength | 760-895 MPa (110-130 ksi) |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
What welding precautions are required for A514?
Critical: (1) Use low-hydrogen electrodes (H4 or H8 classification) — hydrogen-induced cracking is the #1 failure mode. (2) Maintain preheat at 100-150°C depending on thickness. (3) Control heat input (1.5-3.5 kJ/mm) — excessive heat input softens the heat-affected zone, reducing strength. (4) Post-weld dehydrogenation at 200-250°C for 2 hours minimum for sections above 25mm.
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