Chemical Composition and Mechanical Property
| C max | Si max | Mn | P max | S max | Als | Nb | V | Ti max. | Cu max. | Cr max. | Ni max. | Mo max. | N max. |
|
0.18 |
0.50 | 0.90-1.60 |
0.030 |
0.030 |
0.015 | 0.02-0.05 | 0.05-0.10 | 0.02 | 0.35 | 0.20 | 0.40 | 0.08 |
- |
| Yield Strength (MPa) min. | Tensile Strength (MPa) | Elongation min. % |
| 315 | 450-570 | 22 |
1. What are the key mechanical properties of ABS AH32 plates?
Answer:
ABS AH32 is a high-strength shipbuilding steel with:
Tensile strength: 450-570MPa
Yield strength: ≥315 MPa
Elongation: ≥22% (for t≤16mm)
Impact toughness: ≥34J at -20°C
Thickness range: 5-100mm
Certification: ABS (American Bureau of Shipping) approval
2. How does AH32 differ from ordinary shipbuilding steel (Grade A/B)?
Answer:
Key advantages vs. Grade A/B:
| Property | AH32 | Grade A |
|---|---|---|
| Yield Strength | ≥315 MPa | ≥235 MPa |
| Impact Test | -20°C mandatory | Optional |
| CEV | ≤0.40 | ≤0.45 |
| Application | Hull structures | Non-critical parts |
3. What chemical composition ensures its performance?
Answer:
Critical alloying elements:
| Element | Content | Purpose |
|---|---|---|
| C | ≤0.18% | Weldability |
| Mn | 0.90-1.60% | Strength & toughness |
| Nb/V/Ti | Microalloyed | Grain refinement |
| P | ≤0.025% | Ductility |
| S | ≤0.015% | Weld quality |
4. What welding procedures are approved?
Answer:
ABS-approved practices:
Preheat: 50-100°C (for t>25mm)
Consumables: AWS E7016 or equivalent
Heat Input: 1.5-3.5 kJ/mm
Interpass Temp: ≤250°C
Testing: ABS surveyor witness required
5. Where is AH32 typically used in shipbuilding?
Answer:
Primary applications:
Hull plating (high-stress areas)
Deck structures
Longitudinal stiffeners
Bulwarks
Ice-class vessel components
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