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631 Stainless Steel | Stainless Steel Supply

631 stainless steel, also known as SUS 631 or 17-7PH, is a type of stainless steel that is hardened through precipitation. It was developed from 18-8CrNi, an austenitic stainless steel, and has an unstable eat austenite structure after undergoing a solution . This makes it ductile and easy to process. After adjusting the components through precipitation and carbonization, it undergoes martensite transformation treatment to achieve a low-carbon tempered martensite structure with improved toughness. temperatures. Additionally, it has better corrosion resistance than most martensitic stainless steels.

631 stainless steel is commonly used in the manufacturing of high-strength springs, bearings, high-pressure gas cylinders, aircraft parts, and spacecraft parts, among others.

Chemical composition


Note: These values are approximate

Mechanical properties

Tensile strengthYield strengthElongationHardness
≥1035  MPa≥930 MPa≥10%30-32 HRC

Note: These values are approximate

Physical properties

Density7.85 g/cm³
Melting point1398-1446°C
Coefficient of thermal expansion16.5 μm/m-K
Thermal conductivity16.3 W/m-K
Specific heat capacity475 J/kg-K

Note: These values are approximate

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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