Alloy 303 Stainless Steel

Alloy 303 Stainless Steel

Alloy 303 Stainless Steel General Properties 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...
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Alloy 303 Stainless Steel

General Properties

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.


Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)





Chromium17.0 min.-19.0 max.Sulfer0.15-0.35
Nickel8.0 min.-10.0 max.Silicon1.00
Carbon0.10Copper1.00
Manganese2.00Nickel0.110
Phosphorus0.20IronBalance


Physical Properties

Density

0.285 lbs/in3
7.89 g/cm3

Specific Heat

0.12 BTU/lb-°F (32 – 212°F)
502 J/kg-°K (0 – 100°C)

Modulus of Elasticity

28.0 x 106 psi
193 GPa

 

Thermal Conductivity 212°F (100°C)

112 BTU/hr/ft2/ft/°F
16.2 W/m-°K

Melting Range

2500 – 2590°F
1480 – 1530°C

Electrical Resistivity

28.3 Microhm-in at 68°C
72.0 Microhm-cm at 20°C


Mechanical Properties

Typical Values at 68°F (20°C)

Yield Strength
0.2% Offset
Ultimate Tensile
Strength
Elongation
in 2 in.
Hardness

psi (min.)(MPa)psi (min.)(MPa)% (min.)(max.)
45,00031085,00058650202 (HBN)


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