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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

For more information about Alloy 431 for use in medical applications, visit our medical division at www.ammedicalalloys.com

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.