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ASTM A299 Grade A is a manganese–silicon alloy pressure‑vessel steel plate designed for higher strength and improved thermal resistance compared with standard carbon‑steel vessel grades.
The grade provides enhanced tensile performance, stable weldability
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ASTM A299 Grade A is a manganese–silicon alloy pressure‑vessel steel plate designed for higher strength and improved thermal resistance compared with standard carbon‑steel vessel grades. The grade provides enhanced tensile performance, stable weldability, and dependable forming behavior, making it suitable for boilers, heat‑exchangers, and medium‑temperature pressure vessels.
A299 Gr.A is widely used in industrial equipment requiring stronger plate materials than A285, while maintaining good fabrication characteristics.
Chemical Composition
Mechanical Properties
Dimensions
A299 Gr.A is widely used in industrial equipment requiring stronger plate materials than A285, while maintaining good fabrication characteristics.
Chemical Composition
| C | Mn | P | S | Si |
| ≤0.27 | 0.90-1.50 | ≤0.035 | ≤ 0.035 | 0.15-0.30 |
Mechanical Properties
| Property | Yield Strength | Tensile Strength | Elongation |
| Requirement | ≥ 205 MPa | 415-585MPa | ≥ 22% |
| Thickness | 3–150 mm |
| Width | 1220–4200 mm |
| Length | 5000–18000 mm |
| Supports custom cutting and shaping. | |
Applications
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Medium‑temperature pressure vessels
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Boilers and heat‑exchangers
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Industrial tanks and welded containers
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Petrochemical and power‑plant equipment
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Fabricated components requiring higher strength than A285
