Chemical Composition and Mechanical Properties of SUS321 Stainless Steel

SUS321 is an austenitic stainless steel stabilized with titanium. Its chemical composition and mechanical properties are as follows:

Chemical Composition:

Mechanical Properties:

Applications and Industries Using SUS321 Stainless Steel

SUS321 is widely used in various industries due to its excellent corrosion resistance and high-temperature properties:

1. Aerospace industry: Aircraft exhaust manifolds, heat exchangers
2. Automotive industry: Exhaust systems, catalytic converters
3. Chemical processing: Pipes, tanks, and valves
4. Food processing equipment
5. Marine applications
6. Petrochemical industry: Boilers, heat exchangers

Manufacturing Process of SUS321 Stainless Steel

The manufacturing process of SUS321 typically involves:

1. Melting raw materials in an electric arc furnace
2. Refining the molten metal using AOD or VOD processes
3. Continuous casting into slabs
4. Hot rolling to reduce thickness
5. Cold rolling to achieve final dimensions
6. Heat treatment: Solution annealing at 1050-1150°C, followed by rapid cooling

Comparison of SUS321 with Other Stainless Steel Grades

SUS321 offers improved resistance to intergranular corrosion at high temperatures compared to SUS304 due to its titanium content.

Corrosion Resistance and Heat Treatment of SUS321

SUS321 exhibits excellent corrosion resistance:

• Highly resistant to intergranular corrosion in the temperature range of 425-850°C
• Suitable for use in marine environments
• Resistant to many chemicals and acids

Heat treatment:

• Solution annealing: 1050-1150°C, followed by rapid cooling
• Does not require post-weld annealing to restore corrosion resistance

At HL Steel Company, we offer high-quality SUS321 stainless steel products tailored to meet your specific industrial needs, ensuring superior performance in corrosive environments and high-temperature applications.