309S Stainless Steel Pipe & Tube
Jan 27, 2026
Leave a message
What is 309S Stainless Steel Pipe & Tube?
309S Stainless Steel Pipe & Tube is a high-chromium-nickel austenitic stainless steel product, focusing on high-temperature oxidation resistance. It has higher Cr and Ni content than 304 series, suitable for medium-high temperature industrial piping and furnace components.
Equivalent Grades (Horizontal)
UNS: S30908 | JIS: SUS309S | GB: 06Cr23Ni13 | EN: X5CrNi23-12 | W.Nr.: 1.4828
Chemical Composition (wt%, Horizontal)
C: ≤0.08 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 22.00-24.00 | Ni: 12.00-15.00 | Fe: Balance
Key Properties (20°C, Annealed, Horizontal)
Density: 7.98g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤217HB
Core Characteristics
• Excellent high-temperature oxidation resistance: Capable of long-term service at up to 1050°C, forming a dense oxide film to resist high-temperature corrosion • Good high-temperature creep and fatigue resistance, not easy to deform under cyclic high-temperature stress • Reliable welding and forming performance, easy to process into various high-temperature structural components • More economical than 310S series, suitable for medium-high temperature non-severe corrosion scenarios, balancing performance and cost
309S vs 310S Stainless Steel Pipe & Tube (Horizontal)
Cr Content: 309S (22.00-24.00%) | 310S (24.00-26.00%) | Ni Content: 309S (12.00-15.00%) | 310S (19.00-22.00%) | High-Temp Limit: 309S (≤1050°C) | 310S (≤1150°C) | Cost: 309S (Low) | 310S (High)
| Grade | UNS No. | EN No. | C | Cr | Ni | Mo | Others |
| 304 | S30400 | 1.4301 | 0.08 | 18.00 - 20.00 | 8.00 - 12.00 | - | - |
| 304L | S30403 | 1.4307 | 0.035 | 18.00 - 20.00 | 8.00 - 12.00 | - | - |
| 310S | S31008 | 1.4845 | 0.08 | 24.00 - 26.00 | 19.00 - 22.00 | - | - |
| 316 | S31620 | 1.4401 | 0.08 | 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | - |
| 316L | S31603 | 1.4404 | 0.035 | 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | - |
| 316H | S31603 | - | 0.04 - 0.10 | 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | - |
| 316Ti | S31635 | 1.4571 | 0.08 | 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | Ti:5X(C+N) - 0.70 |
| 317L | S31703 | 1.4438 | 0.035 | 18.00 - 20.00 | 11.00 - 15.00 | 3.00 - 4.00 | - |
| 321 | S32100 | 1.4541 | 0.08 | 17.00 - 19.00 | 9.00 - 12.00 | - | Ti:5X(C+N) - 0.70 |
| 347 | S34700 | 1.4550 | 0.08 | 16.00 - 18.00 | 10.00 - 14.00 | - | - |
| 347H | S34709 | 1.4551 | 0.04 - 0.10 | 17.00 - 20.00 | 9.00 - 13.00 | - | - |
| 904L | S8904 | 1.4539 | 0.02 | 19.00 - 23.00 | 23.00 - 28.00 | - | N:0.10 max Cu : 1.0 - 2.0 |
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