403 Martensitic Stainless Steel (UNS S40300)
403 alloy is a corrosion and heat resistant 12% Cr martensitic stainless steel.
This alloy offers a wide range of mechanical properties that are obtainable by appropriate heat treatments.
It is easily hardened by oil, fan or air cooling and may be tempered at temperatures of up to 1350°F (732°C) to improve fracture toughness. Oil or fan cooling is required in thicker sections.
403 alloy has a composition that falls within the limits designated for 410 stainless;
however, it has a tighter range of chromium content and lower maximum silicon and nickel contents.
This composition was developed to meet the exacting requirements of turbine blade constructions, which demand a material
that combines corrosion resistance with a high elastic limit and high impact strength.
The following table shows a comparison of the nominal composition of 403 alloy with that of 410 material.
We are specialised in stainless martensitic steels, products in forms of hot- and cold-rolled sheet, plate, strip, coil and bars.
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