Stainless steels 310, 310S and 310H combine excellent high-temperature properties with good ductility and excellent weldability.
• 310 (UNS S31000): Resistant to oxidation up to 1150°C.
• 310S (UNS S31008): Low carbon content version for improved corrosion resistance in humid environments.
• 310H (UNS S31009): High carbon content version for optimised mechanical strength at high temperatures.
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Chemical Composition (%)

Grade C Mn Si P S Cr Ni
310 ≤0.25 ≤2.00 ≤1.50 ≤0.045 ≤0.030 24.0–26.0 19.0–22.0
310S ≤0.08 ≤2.00 ≤1.50 ≤0.045 ≤0.030 24.0–26.0 19.0–22.0
310H 0.04–0.10 ≤2.00 ≤0.75 ≤0.045 ≤0.030 24.0–26.0 19.0–22.0
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Mechanical Properties

Grade Tensile Strength (MPa) 0.2% Yield Strength (MPa) Elongation (%) Hardness (HRB) Hardness (HB)
310 / 310S / 310H ≥515 ≥205 ≥40 ≤95 ≤217
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Physical Properties

(annealed condition)
Property Value
Density 7750 kg/m³
Modulus of Elasticity 200 GPa
Coefficient of Thermal Expansion (0–538°C) 17.0 µm/m·°C
Thermal Conductivity 14.2 W/m·K (100°C) / 18.7 W/m·K (500°C)
Specific Heat 500 J/kg·K
Electrical Resistivity 720 nΩ·m
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Key Features

• Excellent oxidation resistance up to 1150°C.
• Good corrosion resistance in humid environments (especially 310S).
• Excellent creep and thermal fatigue resistance (especially 310H).
• Good weldability with 310S electrodes recommended.
• Hardness not achievable through heat treatment (cold working only).
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Heat Treatments

• Annealing: 1040–1150°C followed by rapid cooling.
• No thermal hardening possible; cold working to increase strength.
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Industrial Applications

• Furnace parts.
• Burner components.
• Carburising boxes.
• Baskets and supports for heat treatments.
• Heat exchangers.
• Welding electrodes.
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Corrosion Resistance

• Resistant to nitric acid fumes at room temperature and molten nitrates up to 425°C.
• Good resistance in oxidising and carburising atmospheres at high temperature.
• Susceptible to carbide precipitation between 425–860°C if resistance in aqueous environment is required.