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| Grade | Chemical Composition (%) | Mechanical Properties | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mo | Ni | Fe | C | N | H | O | Each | Total | Tensile Strength | Yield Strength | Elongation | Reduction | |
| GR12 | 0.2-0.4 | 0.6-0.9 | ≤0.30 | ≤0.08 | ≤0.03 | ≤0.015 | ≤0.25 | ≤0.10 | ≤0.40 | ≥485 MPa | ≥345 MPa | ≥18% | ≥25% |
| Corrosive Environments | GR12 Performance (Annual Rate) | Comparative Materials |
|---|---|---|
| Boiled hydrochloric acid (20%) | <0.1 mm/y | GR5: >1.2 mm/y, 316L: perforated |
| High temperature sulfuric acid (50°C) | 0.05 mm/y | GR2: 0.5 mm/y |
| Wet hydrogen sulfide with Cl | Zero-stress corrosion cracking | 316L: Cracking within 3 months |