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AISI 431 – Martensitic Stainless Steel

AISI 431 is a high chromium martensitic stainless steel that offers a high yield strength and good corrosion resistance within both organic and industrial environments.


AISI 431
UNS S43100
SAE 51431


Base Element Fe (Iron)

Element Min Max
C (Carbon) 0.2%
Cr (Chromium) 16.6%
Mo (Molybdenum) 1.6%
Mechanical Properties Min Max
Ultimate Tensile Strength (UTS) 770 MPa
Yield Strength 490 MPa
Elongation 20%
Gauge Length A5D
Hardness (Brinell) 230 HB
Charpy V-Notch Impact = Room Temp 55 Joules


Used within the Aearospace Industry, typical applications of grade AISI 431 include but are not limited to; fasteners, bolts & nuts, pump and propeller shafts and Aircraft parts.

Information is given for illustrative purposes only. Tachart accepts no responsibility for the accuracy of the data contained within or the use of the data by any other party.
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