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| Chemical Composition Limits | |||||||||||
| Weight% | C | P | Si | Ni | Mn | S | Cr | Fe | Mo | Cu | N |
| Alloy 431 | 0.12-0.17 | 0.040 max | 0.20-0.60 | 2-3 | 0.3 | 0.030 | 15.50-16.50 | Bal | 0.25 | 0.50 | 0.10 |
Alloy 431 is the most corrosion resistant of the martensitic grades. Due to Alloy 431's excellent tensile and torque strength and good toughness it is used in structural parts that are exposed to marine atmosphere, also for aircraft fasteners and fittings.
| Material | Condition | Tensile Strength (MPa) | Proof Stress 0.2% (MPa) | Elongation 2"% | Reduction of Area | Brinell Hardness |
| Alloy 431 | Alloy 431 Annealed | 862 | 655 | 20 | 55 | 260 |
| Alloy 431 | Alloy 431 Heat Treated AMS 5628 | 1379 | 1034 | 10 | 40 | - |
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