ASTM A283 Grade C: Low-Tensile Structural Carbon Steel
ASTM A283/A283M · Updated: 2026-05-24
ASTM A283 Grade C is a low-to-intermediate tensile strength carbon steel for general structural applications where higher-strength grades are not required. It offers good formability and weldability at economical cost, commonly used for storage tanks, building frames, floor plates, and non-critical structural components. Available in four grades (A, B, C, D) with increasing strength levels—Grade C is the most commonly specified. The lower carbon content (≤0.24%) ensures excellent field weldability without special procedures.
Quick Facts
| Category | Carbon Steel |
| Standard | ASTM A283/A283M |
| Density | 7.85 g/cm³ |
| Yield Strength | 205 MPa (30 ksi) |
| Tensile Strength | 380-515 MPa (55-75 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| S235JR | Compare |
| Q215 | Compare |
| SS330 | Compare |
| St33 | Compare |
| E235 | Compare |
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Frequently Asked Questions
When should A283 Gr C be chosen over A36?
Choose A283 Gr C when cost is the primary driver and the application does not require A36's higher minimum yield strength (205 MPa vs 250 MPa). A283 is commonly used for non-structural building components, tank bottoms, floor plates, and concrete reinforcement where the 10-15% cost savings outweighs the strength reduction. For primary structural members, A36 or A572 should be used.