What is A573 Grade 58
ASTM A573/A573M is a standard specification for structural carbon‑manganese‑silicon steel plates with improved toughness. Grade 58 is the lowest tensile‑strength band within that specification, designed for structures needing moderate strength but good notch toughness at atmospheric temperatures - e.g. storage tanks, welded structural frames, bridges, and general structural plates. ferrobend.com+2MWalloys+2
Key Properties of A573 Grade 58
| Property | Value |
|---|---|
| Yield Strength (min) | 32 ksi [≈ 220 MPa] ferrobend.com+1 |
| Tensile Strength Range | 58–71 ksi [≈ 400–490 MPa] rolfplate.com+1 |
| Elongation (8" / 200 mm gauge length) | ≥ 21 % rolfplate.com+1 |
| Elongation (2" / 50 mm gauge length) | ≥ 24 % ferrobend.com+1 |
Typical Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.23 energy-steel.com+1 |
| Manganese (Mn) | 0.60 – 0.90 energy-steel.com+1 |
| Silicon (Si) | 0.10 – 0.35 rolfplate.com+1 |
| Phosphorus (P) max | ≤ 0.035 energy-steel.com+1 |
| Sulfur (S) max | ≤ 0.04 energy-steel.com+1 |
What are the mechanical properties of A573 Grade 58?
ASTM A573 Grade 58 is a structural carbon-manganese-silicon steel designed for moderate-strength applications with improved toughness. It is widely used in structural plates for bridges, buildings, tanks, and general frameworks. The mechanical properties provide a balance between strength, ductility, and toughness.
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (min) | 32,000 psi (≈220 MPa) |
| Tensile Strength | 58,000 – 71,000 psi (≈400–490 MPa) |
| Elongation (8-inch gauge) | ≥ 21% |
| Elongation (2-inch gauge) | ≥ 24% |
| Impact Toughness | Typically suitable for atmospheric temperatures, not lower than -20°F (-29°C) in standard tests |
| Brinell Hardness | 130–160 HB (approximate) |
| Thickness Range | 3/16 inch (≈5 mm) to 6 inches (≈152 mm) |
| Weldability | Good |
Summary
Yield Strength: 32,000 psi provides adequate resistance to deformation under structural loads.
Tensile Strength: 58,000–71,000 psi allows moderate load-bearing capacity.
Ductility: Elongation ≥ 21–24% ensures good deformation capability without fracture.
Impact Resistance: Suitable for structural applications at atmospheric temperatures.
Weldability: Low carbon content ensures ease of welding for structural fabrication.
Applications: Bridges, storage tanks, structural plates, and welded frameworks where moderate strength and improved notch toughness are required.
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