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ASTM A283 Grade C is a specification for low and intermediate tensile strength carbon steel plates of structual quality for general applications. ASTM A283 Grade C has a specified minimum yield strengths of 30 ksi.
The ASTM A283 specification is the Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates used in general structural applications.ool.
ASTM A283 Chemical Properties
| Grade A | Grade B | Grade C | Grade D | |
| Carbon, max | 0.14 | 0.17 | 0.24 | 0.27 |
| Manganese, max | 0.90 | 0.90 | 0.90 | 0.90 |
| Phosphorus, max | 0.035 | 0.035 | 0.035 | 0.035 |
| Sulphur, max | 0.04 | 0.04 | 0.04 | 0.04 |
Silicon Plates 1 1/2 in and under, max Plates over 1 1/2 in | 0.40 0.15-0.40 | 0.40 0.15-0.40 | 0.40 0.15-0.40 | 0.40 0.15-0.40 |
| Copper min % when copper steel is specified | 0.20 | 0.20 | 0.20 | 0.20 |
ASTM A283 Mechanical Properties
| Grade A | Grade B | Grade C | Grade D | |
| Tensile Strength: | 45,000 -60,000 psi [310 - 415 MPa] | 50,000 -65,000 psi [345 - 450 MPa] | 55,000 75,000 psi [380 - 515 MPa] | 60,000 -80,000 psi [415 - 550 MPa] |
| Min. Yield Point: | 24,000psi [165 MPa] | 27,000psi [185 MPa] | 30,000psi [205 MPa] | 33,000psi [ 230 MPa] |
| Elongation in 8": | 27% min | 25% min | 22% min | 20% min |
| Elongation in 2": | 38% min | 28% min | 25% min | 23% min |
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