3 July 2022

SS 303 Stainless Steel Properties

SS 303 Stainless Steel

SS 303 (UNS 30300) stainless steel bars were developed for machining. Type 303 has a higher concentration of sulfur reducing the drag on cutting tools. It allows greater machining speeds and lower production costs. The alloy is useful whenever a need arises for good corrosion resistance and considerable machining is required.

SS 303 Stainless steel

Minimum Properties
Tensile Strength , psi 85,000
Yield Strength, psi 45,000
Elongation 50%
Hardness Rb 180
Chemistry
Carbon( C) .15 max
Chrome (Cr) 17.0- 19.0
Manganese (Mn) 2.0 max
Nickel ( Ni) 8.0 -10.0
Phosphorus (P) 0.20 max
Sulphur (S) .15 min
Silicon (Si) 1.00 max

Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is austenitic steel containing 18-20% chromium and 8-10% nickel.

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