Roymech engineering encyclopedia

302 Stainless Steel Material Properties

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302 Stainless Steel


Alloy 302 (also know as 18-8) is an austenitic stainless steel it provides useful resistance to corrosion on a wide range of moderately oxidising to moderately reducing environments. Alloy 302 is a slightly higher carbon version of 304, often found in strip and wire forms. It is a tough, ductile grade that demonstrates comparable corrosion resistance, is non-magnetic, and is not hardenable by heat treatment. Alloy 302 is usually used in its annealed condition and has a high ease of fabrication and formability. Alloy 302 is used widely in equipment and utensils for processing and handling of food, beverages and dairy products. Heat exchangers, piping, tanks and other process equipment in contact with fresh water also utilise these alloys. Building facades and other architectural and structural applications exposed to non-marine atmospheres also heavily utilise the 18-8 alloys. In addition, a large variety of applications involve household and industrial chemicals.
Commercial applications for this engineering material include:
- Springs
- Washers
- Screens
- Pressure vessels
- Pressure containing applications
- Sanitary & cryogenic applications

Related Specifications and Trade Names

ASTM/ASME: UNS S30200, EURONORM: FeMi35Cr20Cu4Mo2, DIN: 1.4300, Alloy 302, 18-8, X12CrNi188


Carbon (C) 0.0 - 0.15 %
Chromium (Cr) 18 %
Iron (Fe) 70 %
Manganese (Mn) 0.0 - 2.0 %
Nickel, Ni 9.0 %
Phosphorus (P) 0.0 - 0.045 %
Silicon (Si) 0.0 - 1.0 %
Sulfur (S) 0.0 - 0.030 %

Electrical Properties

Metric Imperial
Dielectric Strength∞V/m∞V/ft
Electric Resistivity (@ 20 °C)72 µΩcm28.30 µΩin
Magnetic Permeability1.0081.008

Mechanical Properties

Metric Imperial
Ductility57 %57 %
Friction Coefficient (static)0.6-0.150.60-0.15
Hardness, Rockwell B8080
Poissons Ratio0.250.25
Mass Density7860 Kg/m3490.68 lb/ft3
Shear Modulus77.2  Mpa11196.91 PSI
Tensile Strength585  MPa84847.05 PSI
Yield Strength255  MPa36984.61 PSI
Youngs Modulus193  GPa27992.28 KSI

Thermal Properties

Metric Imperial
Coefficient of Thermal Expansion (Linear @ 0-100°C)17.2 x 10-6 °C-19.56 x 10-6 °F-1
Melting Point1400-1420 °C2552.00-2588.00 °F
Service Temperature in Air Intermittent870 °C1598.00 °F
Service Temperature in Air Continous925 °C1697.00 °F
Specific Heat Capacity0.5 J/g-°C220.93 BTU/lb-°F
Thermal Conductivity16.2 W/mK9.36 BTU/hr ft°F