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303S31 – Austenitic Stainless Steel

Grade 303S31 is an austenitic stainless Steel and is the most readily machinable of all austenitic stainless Steel grades due to the presence of sulphur in the chemical Composition as seen below. As a result however, the toughness and corrosion resistance is lower to that of similar grades but is still somewhat excellent.


X10CrNiS18 09
Z8CNF18 09


Base Element Fe (Iron)

Element Min Max
C (Carbon) 0.1%
Cr (Chromium) 17% 19%
Cu (Copper) 1%
Mn (Manganese) 2%
N (Nitrogen) 0.11%
Ni (Nickel) 8% 10%
P (Phosphorus) 0.045%
S (Sulphur) 0.15% 0.35%
Si (Silicon) 1%
Mechanical Properties Min Max
Ultimate Tensile Strength (UTS) 500 MPa 750 MPa
0.2% Proof Stress 190 MPa
1.0% Proof Stress 225 MPa
Elongation 35%
Hardness (Brinell) 230 HB

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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