Chemical Composition
The carbon content and other chemical elements in A283 Grade D are very similar to those in A283 Grade C, but there are slight differences in the allowable ranges of elements that could affect their strength and toughness.
| Element | A283 Grade C | A283 Grade D |
|---|---|---|
| Carbon (C) | 0.26–0.30% | 0.23–0.28% |
| Manganese (Mn) | 0.60–1.35% | 0.60–1.35% |
| Silicon (Si) | 0.10–0.40% | 0.10–0.40% |
| Phosphorus (P) | Max 0.035% | Max 0.035% |
| Sulfur (S) | Max 0.035% | Max 0.035% |
Mechanical Properties
The mechanical properties of these two grades are very similar, but A283 Grade D has a slightly lower yield and tensile strength due to its lower carbon content.
| Property | A283 Grade C | A283 Grade D |
|---|---|---|
| Tensile Strength | 60,000–80,000 psi (415–550 MPa) | 60,000–75,000 psi (415–515 MPa) |
| Yield Strength | 32,000 psi (220 MPa) | 30,000 psi (205 MPa) |
| Elongation | 20% (in 8" or 200 mm length) | 20% (in 8" or 200 mm length) |
| Hardness | Max 170 HB | Max 170 HB |
A283 Grade C has slightly higher tensile and yield strength due to its higher carbon content, while A283 Grade D has slightly lower strength.
Applications
Both grades are used for general structural applications, but A283 Grade C is more suitable for situations where slightly higher strength is needed.
| Applications | A283 Grade C | A283 Grade D |
|---|---|---|
| Typical Uses | Structural fabrication, tanks, bridges | Structural fabrication, general construction |
| Industries | General construction, bridge construction | General construction, fabrication |
Summary of Key Differences
| Aspect | A283 Grade C | A283 Grade D |
|---|---|---|
| Carbon Content | 0.26–0.30% | 0.23–0.28% |
| Tensile Strength | 60,000–80,000 psi (415–550 MPa) | 60,000–75,000 psi (415–515 MPa) |
| Yield Strength | 32,000 psi (220 MPa) | 30,000 psi (205 MPa) |
| Applications | More demanding structures | General structural use |
conclusion
A283 Grade C is generally preferred for applications requiring slightly higher strength and toughness.
A283 Grade D is more commonly used for general structural purposes but is not suitable for high-strength applications compared to Grade C.
Both grades are versatile for structural work, but A283 Grade C is better for applications that require slightly higher strength.
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