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431 Stainless Steel has been designed to improved corrosion resistance and toughness properties than other 400 stainless grades especially in a quench-hardenable stainless. 431 would work well in marine environments as well as in aerospace applications such as aircraft fasteners and fittings. This alloy has great impact strength at a high hardness level.
Out of all the martensitic grades of stainless steel 431 has the best corrosion resistance. Some other applications include: bomb racks, bolts, pump shafts, valve stems and aircraft fasteners. Only the age hardenable martensitic stainless grades could achieve greater resistance to corrosion. 431 is available in round bar, strip and wire.
Stainless Steel Grade 431
Technical Data Sheet
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.
| 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 |
Typical Mechanical Properties
| 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 | - |
Availability
Grade 431 is available in Bar (Round), Strip, Wire, Rod, Billet. For all stock availability contact Sales.
Specifications
Grade 431 Stainless Steel Bar, Wire, Forgings, Tube
AMS 5628 Bars / wire / forgings
AMS-S-18732
MIL-S-18732
QQ-S-763
ASTM A276 / ASME SA276
ASTM A478 / ASME A478
ASTM A314 / ASME SA314
ASTM A484 / ASME SA484
ASTM A580 / ASME SA580
BS 7S80
BS 970; 431S29
EN57
UNS S43100
DMS-1565
