Alloy 303 (UNS S30300) is an austenitic stainless steel developed for applications requiring extensive machining operations. The alloy has a sulfur addition which assists in breaking up turnings while reducing drag on the cutting tool when compared to the machining characteristics of the conventional 18-8 stainless steels.
The alloy is nonmagnetic in the annealed condition , but may become slightly magnetic as a result of cold working. The addition of sulfur negatively impacts the corrosion resistance of 303 making it less resistant than 304 to mildly corrosive environments.
Weight % (all values are maximum unless a range is otherwise indicated)
|Chromium||17.0 min.-19.0 max.||Sulfer||0.15-0.35|
|Nickel||8.0 min.-10.0 max.||Silicon||1.00|
0.12 BTU/lb-°F (32 – 212°F)
502 J/kg-°K (0 – 100°C)
Modulus of Elasticity
28.0 x 106 psi
Thermal Conductivity 212°F (100°C)
2500 – 2590°F
1480 – 1530°C
28.3 Microhm-in at 68°C
72.0 Microhm-cm at 20°C
Typical Values at 68°F (20°C)
in 2 in.
|psi (min.)||(MPa)||psi (min.)||(MPa)||% (min.)||(max.)|