321 Stainless Steel Coil and Sheet Basic Information
321 is equivalent to
- ASTM: 321
- AISI: 321
- JIS: SUS321
- EN: 1.4541
- DIN: X6CrNiTi18-10
- UNS: S32100
321 Stainless Steel Processing
Corrosion Resistance of 321 Stainless Steel
321 stainless steel offers similar corrosion resistance to 304, with added resistance to intergranular corrosion due to its titanium content.
Heat Resistance of 321 Stainless Steel
Good resistance to oxidation in intermittent service up to 900°C and in continuous service to 925°C.
Machinability of 321 Stainless Steel
321 stainless steel is similar to 304 in terms of machinability, with a hardening rate that makes it less machinable than 410 stainless steel. It is more difficult to machine due to its titanium stabilization.
Welding of 321 Stainless Steel
321 stainless steel is similar to 304 in terms of machinability, with a hardening rate that makes it less machinable than 410 stainless steel. It is more difficult to machine due to its titanium stabilization.
Hot Working of 321 Stainless Steel
321 stainless steel is similar to 304 in terms of machinability, with a hardening rate that makes it less machinable than 410 stainless steel. It is more difficult to machine due to its titanium stabilization.
Annealing of 321 Stainless Steel
Solution heat treatment should be conducted at 920-1150℃ with rapid cooling. Stabilization treatment can be performed at 850-930℃ if specified. The solution temperature should not exceed 1066℃ to avoid chromium precipitation.
Heat Treatment of 321 Stainless Steel
321 stainless steel cannot be hardened by heat treatment; it can only be hardened by cold working.
Cold Working of 321 Stainless Steel
321 stainless steel is similar to 304 in terms of machinability, with a hardening rate that makes it less machinable than 410 stainless steel. It is more difficult to machine due to its titanium stabilization.
321 Stainless Steel Mechanical Property and Physical Property
| 321 Stainless Steel Mechanical Property | ||||
| Property | Yield Strength, min. (ksi) | Tensile Strength, min. (ksi) | Elongation, min. (%) | Hardness, max. (Rb) |
| Value | 30 | 75 | 40 | 95 |
| Physical Properties of 321 Stainless Steel | ||
| Property | Value | Unit |
| Density | 0.286 | lb/in³ |
| Modulus of Elasticity | 28.0 x 106 | psi |
| Coefficient of Thermal Expansion (68-212°F) | 9.2 x 10-6 | /°F |
| Thermal Conductivity | 9.3 | Btu/ft·hr·°F |
| Specific Heat | 0.12 | Btu/lb·°F |
| Electrical Resistivity | 28.4 | Microohm-in |
321 Stainless Steel Chemical Composition
Grade | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Fe (balance) | N (max) | Ti(max) |
321 | 0.08 | 2 | 0.75 | 0.045 | 0.03 | 17.00-19.00 | 9.00-12.00 | Approximately 68-73% | 0.1 | 0.70% |
Why Choose 321 Stainless Steel?
Intergranular Corrosion Resistance
Stabilized with titanium, 321 stainless steel resists intergranular corrosion even after exposure to temperatures in the carbide precipitation range.
High Temperature Stability
321 maintains strength and toughness at temperatures up to 900°C (1652°F).
Good Mechanical Properties
321 provides excellent mechanical properties, making it suitable for high-stress applications.
Versatility
321 is suitable for various manufacturing processes, including welding and forming.
321 or Other?
Takeaway
What is the difference between 321 vs 304 stainless steel?
- Corrosion Resistance: 321 offers better resistance to intergranular corrosion than 304, especially after exposure to high temperatures.
- High-Temperature Performance: 321 can withstand higher temperatures than 304, maintaining mechanical properties and preventing carbide precipitation.
- Cost: 304 is generally more cost-effective for general-purpose applications, but 321 is preferred for high-temperature environments and specific corrosion-resistant applications.
What is the difference between 321 vs 316 stainless steel?
- Corrosion Resistance: 316 stainless steel provides better overall corrosion resistance, particularly in marine and chloride environments, due to its molybdenum content.
- High-Temperature Performance: 321 is better suited for high-temperature applications up to 900°C, whereas 316 performs well up to 800°C (1472°F).
- Application Specifics: Choose 316 for environments with severe corrosion issues and 321 for applications requiring high-temperature stability and resistance to intergranular corrosion.
Sanmei's 321 Stainless Steel Coil and Shhet Specification
For Coil
| Type | Width (mm) | Weight (MT) | Thickness (mm) | ||||
| 321 Coil | 1000, 1219, 1240, 1500 or Customized | 3-10 | 0.15-3.0 | ||||
For Sheets
| Type | Width (mm) | Length (mm) | Thickness (mm) | |||||||||
| 321 Sheets | 1000, 1219, 1240, 1500 or Customized | 2000, 2438, 2500, 3000, 3048 | 0.3-3.0 | |||||||||
Basic Surfaces for Stainless Steel Coils and Sheets
The basic finish options for 201, 304, 304L, 316, 316L, and 430, etc. stainless steel coils and sheets include 2B, BA, No. 1, and No. 4 finishes. Please get in touch with our professional sales team for details on other grades and finishes.
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