What is 321H (UNS S32109) Stainless Steel
Jan 22, 2026
Leave a message
321H (UNS S32109, 1.4541, SUS321H) is high-carbon titanium-stabilized stainless steel, combining 321's corrosion resistance with enhanced high-temp creep strength.
Equivalent Grades (Horizontal)
UNS: S32109 | JIS: SUS321H | GB: 07Cr18Ni11Ti | EN: X7CrNiTi18-10
Chemical Composition (wt%, Horizontal)
C: 0.04-0.10 | 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
Superior high-temperature creep strength (600-870°C); excellent post-weld corrosion resistance; mandatory post-weld annealing; suitable for high-temp stress-bearing components.
321 vs 321H (Horizontal)
Carbon Content: 321 (≤0.08%) | 321H (0.04-0.10%) | High-Temp Creep: 321 (Ordinary) | 321H (Excellent) | Post-weld Annealing: 321 (Optional) | 321H (Mandatory)
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.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.
Send Inquiry