Roymech engineering encyclopedia

304 Stainless Steel Material Properties

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304 Stainless Steel


304 stainless steel is a type of austenitic stainless steel, which is a widely used and versatile class of stainless steels known for their corrosion resistance, high-temperature strength, and excellent formability. Also known as A2. It belongs to the 300 series of stainless steels, which are known for their excellent corrosion resistance, durability, and ease of fabrication.
In an offshore environment 304 will tarnish and show rust especially at welds while 316 wont. 304 is preferred in cryogenic (LiN, LPG, etc) over 316 and both preferred over any carbon steel which will become brittle. 304 and 316 can both be a quick fix where offshore carbon steels would other require charpy impact testing. 304 needs consideration of consumables, pass temperature and pickling and passivation when being welded for clean but corrosive service.
Corrosion resistance: Resistance to moderately aggressive organic acids & resistance to corrosion in oxidizing environments.
Commercial applications for this engineering material include:
- Pharmaceutical processing equipment
- Chemical processing equipment
- Architectural mouldings
- Sinks & splashbacks
- Tubing
- Springs, nuts, bolts & screws

Related Specifications and Trade Names

EURONORM: 1.4301, ASTM/ASME: UNS S30400, BS 304S31, AFNOR Z2 CN 18-10, EN, DIN,UNI X5CrNi 18-10, Grade 304, Alloy 304, Type 304


Carbon (C) 0.0 - 0.080 %
Chromium (Cr) 18 - 20 %
Iron (Fe) 66.345 - 74 %
Manganese (Mn) 0.0 - 2.0 %
Nickel (Ni) 8.0 - 10.5 %
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 Permeability1.021.02

Mechanical Properties

Metric Imperial
Ductility70 %70 %
Friction Coefficient (static)0.6-0.150.60-0.15
Hardness, Rockwell B7070
Poissons Ratio0.290.29
Mass Density8000 Kg/m3499.42 lb/ft3
Shear Modulus750  Mpa108778.28 PSI
Tensile Strength517  MPa74984.49 PSI
Yield Strength206  MPa29877.77 PSI
Youngs Modulus193-200  GPa27992.28-29007.54 KSI

Thermal Properties

Metric Imperial
Coefficient of Thermal Expansion (Linear @ 0-100°C)17.3 x 10-6 °C-19.62 x 10-6 °F-1
Melting Point1400-1450 °C2552.00-2642.00 °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 Conductivity14.0-16.3 W/mK8.09-9.42 BTU/hr ft°F