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AISI 420 – Martensitic Stainless Steel

AISI 420 is a martensitic stainless steel that offers a high hardenability and strength. It also offers an excellent corrosion resistance to acidic and alkaline substances.


AISI 420
SAE 51420


Base Element Fe (Iron)

Element Min Max
C (Carbon)
Cr (Chromium) 0.15%
Mn (Manganese) 12% 14%
Mo (Molybdenum) 0.3% 0.6%
Ni (Nickel) 0.5%
P (Phosphorus) 0.04%
S (Sulphur) 0.03%
Si (Silcon) 1%
Mechanical Properties Min Max
Ultimate Tensile Strength (UTS) 1590 MPa
0.2% Proof Stress 1340 MPa
Elongation 8%
Gauge length A50mm
Hardness (Brinell) 500 HB


Common applications include but are not limited to, cutlery, plastic molds and dies, hand tools, dental and surgical instruments etc.

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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