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310H Stainless Steel

Penn Stainless inventory now includes 310H Plate and Processed Flat Bar (Alloy 310H UNS S31009), ideally suited for high-temperature applications such as heat treatment and chemical processing equipment.


General Properties

Alloy 310H (UNS S31009) has a carbon content restricted to exclude the lower end of the 310 range. This makes 310H the grade of choice for high temperature applications. This steel has good resistance to oxidation at temperatures of up to 1040°C (1904°F) in intermittent service and 1150°C (2102°F) in continuous service. It is widely used in environments where sulfur dioxide gas is present at high temperatures; however it is recommended that this steel should not be continuously used at 425-860°C (797-1580°F) range due to carbide precipitation.


Grade 310H stainless steel is chiefly used in the heat treatment industry, and the chemical process industry.

  • Fans
  • Trays
  • Baskets
  • Rollers
  • Burner parts
  • Oven linings
  • Tube hangers
  • Retorts linings
  • Conveyor belts
  • Refractory supports
  • Containers for hot concentrated acids, ammonia, and sulfur dioxide
  • Used along with hot acetic and citric acid in the food processing industry.

Value Added Services:

  • Need a special length?
    • We can custom level 3/8″ thick x 72″ x 186″ from our plate line to reduce scrap
  • Polish plate inventory available
    • We supply #4, #6, and #8 mirror finish
    • Special polishes available
  • Plate processing
  • Dynamic water jet cutting
  • Plate shearing
  • Saw cutting
  • Plasma cutting and high quality plasma cutting
  • Machine cut rings and discs

Penn Stainless Alloy 310H Plate and Processed Flat Bar provides superior resistance to corrosion and heat exposure, in even the most demanding environments.

Corrosion Resistance:

  • The high chromium content – intended to increase high temperature properties – also gives this grades good aqueous corrosion resistance.
  • In high temperature service, 310H exhibits good resistance to oxidising and carburising atmospheres. 

Heat Resistance:

  • 310H has good resistance to oxidation in intermittent service in air at temperatures up to 1040°C and 1150°C in continuous service.
  • Good resistance to thermal fatigue and cyclic heating. Widely used where sulphur dioxide gas is encountered at elevated temperatures.
  • Continuous use in 425-860°C range not recommended due to carbide precipitation, if subsequent aqueous corrosion resistance is needed, but it often performs well in temperatures fluctuating above and below this range.
  • Prone to sigma phase embrittlement in the temperature range 650 – 900°C.
  • Grade 310H is generally used at temperatures starting from about 800 or 900°C – above the temperatures at which 304H and 321 are effective


  • Commonly used in the heat treatment and process industries due to high temperature and corrosive environments
  • Often fabricated into complex structures
  • Roller-forms, stamps and draws readily
  • Because 310 work hardens, severe forming operations should be followed by an anneal


  • Austenitic stainless steel is generally considered to be weldable
  • Generally considered to have weldability equivalent to 304 and 304L
  • Special consideration is needed to compensate for a higher coefficient of thermal expansion to avoid warping and distortion

Chemical Composition

Element Content (%)
Iron, Fe 49.075-45.865
Chromium, Cr 24-26
Nickel, Ni 19-22
Manganese, Mn 2
Silicon, Si 0.75
Phosphorous, P 0.045
Carbon, C 0.040-0.10
Sulfur, S 0.03

Mechanical Properties

Properties Metric Imperial
Tensile strength 515 MPa 74694 psi
Yield strength 205 MPa 29732 psi
Modulus of elasticity 200 GPa 29000 ksi
Shear modulus 77.0 GPa 11200 ksi
Poissons ratio 0.3 0.3
Elongation at break (in 50 mm) 40% 40%
Hardness, Rockwell B 95 95
Hardness, Brinell 217 217

Physical Properties

Quantity Value Unit
Thermal expansion 16 – 17 e-6/K
Thermal conductivity 16 – 16 W/m.K
Specific heat 500 – 500 J/kg.K
Melting temperature 1370 – 1400 °C
Service temperature 0 – 500 °C
Density 8000 – 8000 kg/m3
Resistivity 0.7 – 0.7 Ohm.mm2/m

Alloy 304H PDF
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