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Main Material Property List
Stainless Steel 431 is stocked by 14 North American distributors and produced by 17large mills. Distributors will offer small quantity buys while mills willgenerally only sell large quantities, with delivery times anywhere from 10 to50 weeks depending on size and form required
This material is stocked primarily in BarProducts by 11 distributors but is also available to a lesser extent inFasteners, Forging Products, Piping Components, Tubular Products, and Wire Products.
The following specifications cover Stainless Steel 431
AISI 431AMS 5628ASTM A276ASTM A473ASTM A493ASTM A511ASTM A579ASTM A580DIN 1.4057MIL S-18732MIL S-8967UNS S43100
Carbon 0.2 max
Chromium 15 - 17
Manganese 1 max
Nickel 1.25 - 2.5
Phosphorus 0.04 max
Silicon 1 max
Sulphur 0.03 max
Principal Design Features :431 is amartensitic stainless combining excellent impact strength at high hardnesslevels with the best corrosion resistance of any martensitic stainless steels.
Applications: 431 has been successfullyused in a variety of aircraft and general industrial applications. Theseinclude fasteners, bolts, valve components and chemical equipment.
Machinability:In the fully annealedcondition, 431 will gall and build up on the tools. Good surface finishes arenot easily obtained.
Welding: Mostelectric welding procedures have proven successful with 431 stainless. Fillermetal should be AWS E/ER410.To avoid cracking, pre-heat the workpiece to 400-600F (204-316 C). After air cooling, treat at 1200 F (649 C) to reattain maximumproperties.
Hot Working: Heat to 2100-2200 F (1149-1204 C) for best results. Do not workmaterial below 1650 F (900 C).
Cold Working :This alloy is easily drawn, spun, headed, sheared and bent comparedwith other stainless steels.
Hardening:1800-1950 F (982-1066 C), oilquench or ail cool for maximum properties.
Density (lb / cu. in.) 0.28
Specific Gravity 7.75
Specific Heat (Btu/lb/Deg F - [32-212 DegF]) 0.11
Electrical Resistivity (microhm-cm (at 68Deg F)) 432
Melting Point (Deg F) 2700
Modulus of Elasticity Tension 29
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