Roymech engineering encyclopedia

304L Stainless Steel Material Properties

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304L Stainless Steel


304L 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. The 304 in its name refers to its composition, primarily composed of iron, chromium, and nickel. The L stands for low carbon, indicating that this variant has a lower carbon content compared to standard 304 stainless steel. Excellent welding properties; post-weld annealing is not required when welding thin sections.
304L stainless steel is highly resistant to corrosion and staining, making it suitable for a wide range of applications, including use in corrosive environments and exposure to chemicals.
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 1.4307, ASTM/ASME: UNS S30403, BS 304S11, AFNOR Z2 CN 18-9, EN X5CrNi18-9, DIN X5CrNi18-9, UNI X5CrNi18-9, Grade 304L, Alloy 304L and Type 304L.


Carbon (C) 0.0 - 0.03%
Chromium (Cr) 17.50 - 19.50%
Manganese (Mn) 0.0 - 2.00%
Silicon (Si) 0.0 - 1.00%
Phosphorous (P) 0.0 - 0.05%
Sulphur (S) 0.0 - 0.02%
Nickel (Ni) 8.00 - 10.50%
Nitrogen (N) 0.0 - 0.11%
Iron (Fe) Balance

Electrical Properties

Metric Imperial
Dielectric Strength∞V/m∞V/ft
Electric Resistivity (@ 20 °C)70 µΩcm27.51 µΩin
Magnetic Permeability1.0081.008

Mechanical Properties

Metric Imperial
Ductility58 %58 %
Friction Coefficient (static)0.6-0.150.60-0.15
Hardness, Rockwell B8282
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