630 Stainless Steel: Common Forms and Applications

29 February 2024

630 stainless steel, also known as precipitation-hardening stainless steel, is a unique type of steel renowned for its diverse applications. Here's a professional introduction to its common forms and applications:

Common Forms

630 stainless steel is primarily available in forms such as sheets, bars, wires, and tubing. These forms allow 630 stainless steel to cater to various processing and manufacturing needs, making it widely applicable across multiple industries.


  1. Mechanical Components and Parts: 630 stainless steel is renowned for its high strength, hardness, and wear resistance, making it ideal for manufacturing mechanical components and parts such as bearings, gears, shafts, valves, and more. Its excellent machinability also allows for cutting, welding, bending, and other processing operations, facilitating ease of manufacturing.
  2. Aerospace Industry: Due to its high strength and corrosion resistance, 630 stainless steel finds widespread use in the aerospace industry. It can be found in aircraft and rocket engine components, structural parts, fasteners, and other critical applications.
  3. Petrochemical and Marine Engineering: In these sectors, 630 stainless steel is commonly used for manufacturing corrosion-resistant pipelines, containers, storage tanks, valves, and other equipment. Its superior corrosion resistance enables it to maintain its performance in harsh environments.
  4. Medical Devices and Automobile Manufacturing: 630 stainless steel is also extensively used in the medical device and automobile manufacturing industries. In medical applications, it's employed for surgical instruments, dental tools, and more. In automobile manufacturing, 630 stainless steel is used for engine components, exhaust systems, and other key parts.
  5. Decoration Industry: Thanks to its aesthetic appearance and good corrosion resistance, 630 stainless steel is also popular in the decoration industry. It can be found in doors, windows, railings, sculptures, and other decorative elements.


630 stainless steel boasts a high degree of hardening and ductility, allowing it to be formed into various shapes in a single process. Heat treatment further enhances its mechanical properties, achieving compressive strengths up to 1100-1300 MPa (160-190 ksi). This stainless steel also exhibits excellent corrosion resistance in atmospheric conditions and diluted acids or salts, comparable to that of 304 and 430 stainless steels.

Overall, 630 stainless steel's superior properties such as high strength, hardness, wear resistance, and corrosion resistance have made it widely applicable across multiple industries. With ongoing technological advancements, the potential applications of 630 stainless steel are expected to expand further.