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AISI 303 – Austenitic Stainless Steel

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AISI 303 is an austenitic stainless steel, offering an excellent machinability and toughness, being the most readily machine-able of all austenitic grades of Stainless Steel. It’s corrosion resistance however, is weaken then that of type 304.


AISI 303


Element Min Max
C (Carbon) 0.12%
Cr (Chromium) 17% 19%
Mn (Manganese) 1% 2%
Ni (Nickel) 8% 11%
P (Phosphorus) 0.045%
S (Sulphur) 0.15% 0.3%w
Si (Silicon) 0.2% 1%
Mechanical Properties Min Max
Ultimate Tensile Strength (UTS) 510 MPa
0.2% Proof Stress 208 MPa
Elongation 40%
Gauge Length 5.65vSo
Hardness (Brinell) 183 HB



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