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303se Stainless Steel | Stainless Steel Supply

303se stainless steel is a free-machining variation of the basic 18-8 austenitic stainless steel. It is an ideal choice for applications that require excellent machinability and good corrosion resistance. The “se” in 303se stands for “selenium”, which is added to enhance the machinability of the alloy. Compared to 303 stainless steel, the addition of selenium in 303se results in better machinability, improved chip breaking, and reduced tool wear.

Chemical composition


Note: These values are typical

Mechanical properties

Tensile strengthYield strengthElongation
620 Mpa275 Mpa50%

Note: These values are approximate

Physical properties

Density8.03 g/cm³
Melting Point1455-1510 °C
Electrical Conductivity2.10e6 S/m
Thermal Conductivity16.2 W/m-K
Specific Heat Capacity500 J/kg-K
Elastic Modulus200 GPa
Poisson’s Ratio0.28

Note: These values are approximate

303se stainless steel has good corrosion resistance in mildly corrosive environments and can be used in a wide range of applications, such as fittings, fasteners, and bushings. However, it is not recommended for use in highly corrosive environments or where the material is exposed to high temperatures.

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

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