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309S Stainless Steel | Stainless Steel Supply

309S stainless steel is a high-temperature corrosion-resistant alloy that is part of the austenitic family of stainless steels. It is a modified version of the popular 309 stainless steel, with a lower carbon content to improve its weldability and reduce the risk of sensitization, which is a form of corrosion that can occur in the heat-affected zone of a weld.

Chemical composition



Note: These values are typical

Mechanical properties

Tensile strengthYield strengthElongation
620-720 Mpa310 Mpa40%

Note: These values are approximate

Physical properties

Density7.89 g/cm³
Melting point1398-1454°C (2550-2650°F)
Specific heat capacity502 J/kg·K
Electrical resistivity74.0 nΩ·m (at 20°C)
Thermal conductivity15.6 W/m·K
Thermal expansion coefficient14.9 μm/m·°C (at 0-100°C)

Note: These values are approximate

The high-temperature resistance and corrosion resistance of 309S stainless steel make it an ideal material for various high-temperature applications. Some common applications of 309S stainless steel include:

Manufacturing of heat exchangers, furnace parts, and other high-temperature equipment
Chemical processing equipment
Power generation equipment
Aerospace industry components
Food processing equipment

As a premium supplier of stainless steel, we offer a wide range of grades, sizes and finishes to suit your needs.
Size: according to customer requirements
Standards: GB, ASTM, EN, JIS, etc.
Austenitic type
Ferritic type
Martensitic type

Looking forward to your inquiry!