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Description
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:
| Element | Percentage |
|---|---|
| Carbon | ≤0.08% |
| Chromium | 17.0-19.0% |
| Nickel | 9.0-12.0% |
| Titanium | 5(C+N)-0.70% |
| Manganese | ≤2.00% |
| Silicon | ≤0.75% |
Mechanical Properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 205 MPa |
| Tensile Strength (min) | 515 MPa |
| Elongation (min) | 40% |
| Hardness (max) | 217 HB |
Applications and Industries Using SUS321 Stainless Steel
SUS321 is widely used in various industries due to its excellent corrosion resistance and high-temperature properties:
- Aerospace industry: Aircraft exhaust manifolds, heat exchangers
- Automotive industry: Exhaust systems, catalytic converters
- Chemical processing: Pipes, tanks, and valves
- Food processing equipment
- Marine applications
- Petrochemical industry: Boilers, heat exchangers
Manufacturing Process of SUS321 Stainless Steel
The manufacturing process of SUS321 typically involves:
- Melting raw materials in an electric arc furnace
- Refining the molten metal using AOD or VOD processes
- Continuous casting into slabs
- Hot rolling to reduce thickness
- Cold rolling to achieve final dimensions
- Heat treatment: Solution annealing at 1050-1150°C, followed by rapid cooling
Comparison of SUS321 with Other Stainless Steel Grades
| Grade | Titanium Content | Corrosion Resistance | High-Temperature Performance |
|---|---|---|---|
| SUS321 | 5(C+N)-0.70% | Excellent | Excellent |
| SUS304 | – | Very Good | Good |
| SUS316 | – | Excellent | Good |
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.
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