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X8CrNiS18 9 – Austenitic stainless steel

X8CrNiS18 9 is an austenitic stainless steel that offers the most machinability then any other austenitic grade due to it’s inclusion of Sulphur in the composition.  This does however lower the the corrosion resistance and toughness of this grade, though the toughness is still excellent as with other austenitic grades.

Alias

X8CrNiS18 9
1.4305
BS EN 10088-5

Chemistry

Element Min Max
C (Carbon) 0.1%
Cr (Chromium) 17% 19%
Cu (Copper) 1%
Mn (Manganese) 2%
N (Nitrogen) 0.1%
Ni (Manganese) 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%
Gauge Length A80mm
Hardness (Brinell) 230 HB

Applications

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