1. Differences in mechanical properties
| Items | A36 Welded Pipe | A283GrC Welded Pipe |
|---|---|---|
| Yield Strength | ≥250 MPa(thickness ≤50mm) | 205 MPa |
| Tensile Strength | 400~550 MPa | 380~515 MPa |
| Low temperature impact energy | -29℃ impact energy ≥27J (thickness ≤50mm) | No mandatory requirement |
| Elongation | ≥20%1 | ≥22% |
2. Comparison of Chemical Composition
| Elements | A36 welded pipe | A283GrC welded pipe |
|---|---|---|
| C | ≤0.29% | ≤0.24% |
| Mn | 0.8~1.2% | ≤0.90% |
| P | ≤0.04% | ≤0.035% |
| S | ≤0.05% | ≤0.040% |
Key differences:
A36 enhances strength through high manganese content, while A283GrC focuses on phosphorus and sulfur impurity control to improve purity;
A36 has a higher carbon equivalent (Ceq=0.35~0.47%), and the risk of cold cracking during welding needs to be prevented.
3. Application Scenarios and Features
| Type | Applications | Limitations and Advantages |
|---|---|---|
| A36 welded pipe | Dynamically loaded structures (bridges, building frames, machinery foundations) | High weldability/machinability Higher cost |
| A283GrC welded pipe | Static pressure equipment (low-pressure storage tanks, general structural parts) | Strict surface quality Not suitable for heavy load scenarios |
4. Standards and manufacturing requirements
Implementation standards:
A36: Follow ASTM A36/A36M (general structural pipe);
A283GrC: Execute ASTM A283/A283M (focus on static equipment).
Delivery status:
Both are delivered in hot-rolled state, and A283GrC can be additionally required for normalizing treatment;
A36 welded pipes are required to have weld flaw detection, and A283GrC focuses on surface defect control
