304H Stainless Steel Pipe & Tube
Jan 27, 2026
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What is 304H Stainless Steel Pipe & Tube?
304H Stainless Steel Pipe & Tube is the high-carbon variant of 304 series, specially formulated to enhance high-temperature creep strength. It is designed for high-temperature, high-stress piping applications such as boiler superheaters and industrial furnace tubes.
Equivalent Grades (Horizontal)
UNS: S30409 | JIS: SUS304H | GB: 07Cr19Ni10 | EN: X6CrNi18-10 | W.Nr.: 1.4307
Chemical Composition (wt%, Horizontal)
C: 0.04-0.10 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 18.00-20.00 | Ni: 8.00-10.50 | N: ≤0.10 | Fe: Balance
Key Properties (20°C, Annealed, Horizontal)
Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤201HB
Core Characteristics
• High carbon content: Significantly improves high-temperature creep strength, maintaining structural integrity under 600-870°C long-term stress • Good high-temperature oxidation resistance, suitable for continuous high-temperature service in oxidizing atmospheres • Mandatory post-weld annealing: Ensures uniform structure and stable high-temperature performance, avoiding performance attenuation • Ideal for high-temperature, high-pressure piping components in power plants, boilers and industrial furnaces
304 vs 304H Stainless Steel Pipe & Tube (Horizontal)
Carbon Content: 304 (≤0.08%) | 304H (0.04-0.10%) | High-Temp Creep Strength: 304 (General) | 304H (Excellent) | Annealing: 304 (Optional) | 304H (Mandatory) | High-Temp Adaptability: 304 (≤800°C) | 304H (≤870°C)
| 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 |
304 Stainless Steel Suppliers
If you have project requirements for 304 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.
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