What Is 321 (UNS S32100) Stainless Steel
Jan 22, 2026
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321 (UNS S32100, 1.4541, SUS321) is titanium-stabilized austenitic stainless steel, preventing intergranular corrosion, similar to 304 but with better high-temp stability.
Equivalent Grades (Horizontal)
UNS: S32100 | JIS: SUS321 | GB: 06Cr18Ni11Ti | EN: X6CrNiTi18-10
Chemical Composition (wt%, Horizontal)
C: ≤0.08 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 17.00-19.00 | Ni: 9.00-12.00 | Ti: 4×C-0.70 | Fe: Balance
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
| 321 | min. max |
- 0.08 |
2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 |
- | 9.0 12.0 |
0.10 | Ti=5(C+N) 0.70 |
| 321H | min. max |
0.04 0.10 |
2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 |
- | 9.0 12.0 |
- | Ti=4(C+N) 0.70 |
Key Properties (20°C, Annealed, Horizontal)
Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | 0.2% Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness (HB): ≤201
Core Characteristics
Excellent post-weld intergranular corrosion resistance (titanium-stabilized); good high-temp stability (up to 870°C); good weldability; suitable for high-temp welding components.
304 vs 321 (Horizontal)
Ti Content: 304 (None) | 321 (4×C-0.70%) | High-Temp Stability: 304 (Ordinary) | 321 (Good) | Intergranular Corrosion: 304 (Poor post-weld) | 321 (Excellent)
Stainless Steel Suppliers
If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com
Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
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