347H Stainless Steel Seamless Pipe ASTM A312 DN10-DN400
Price:
5-8 USD/Kg
MOQ:
500 kgs
Delivery Time:
5 - 12 days based on the quantity
Brand:
DELTA
Product Description
SMLS Stainless Steel Pipe Tube Alloy TP347H ASTM A312 Alloy OD89MM 108MM 168MM 219MM
Products Specification
| Products Name | 347 Stainless Steel Seamless Pipe |
Grade: |
304 304L 309S 310S 314 316L 316Ti 321 329 347H 410 2205 2507 S32760 904L 254SMO and equal grade in GB JIS EN DIN Standard |
| Standards: | ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect. |
| DIN 17456-85 DIN 17458-85 DIN 17459-92.ect | |
| JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect. | |
| GB13296-1991 GB14975-2002 GB14976-2002,ect. | |
| Size: | ND5 - DN400 |
| Length: | 6m length or cutting any length as request |
| Applications: | fluid and gas transport, structure , boiler, heat exchanger, super heater |
347H stainless steel is a high-performance austenitic stainless steel alloy, renowned for its exceptional high-temperature strength and resistance to intergranular corrosion. Its unique composition, particularly the addition of niobium (Nb), stabilizes the material by preventing carbide precipitation at grain boundaries, making it ideal for demanding industrial environments involving elevated temperatures and corrosive conditions.
Chemical Composition
The precise alloying elements in 347H stainless steel are as follows:
| Element | Content Range (%) | Purpose |
|---|---|---|
| Chromium (Cr) | 17.0 – 19.0 | Enhances corrosion resistance and oxidation resistance at high temperatures. |
| Nickel (Ni) | 9.0 – 13.0 | Stabilizes the austenitic structure, improving ductility and toughness. |
| Niobium (Nb) | ≥ 5 × C (min) | Prevents carbide precipitation (sensitization), enhancing intergranular corrosion resistance. |
| Carbon (C) | 0.04 – 0.10 | The "H" designation indicates higher carbon content, boosting high-temperature strength. |
| Manganese (Mn) | ≤ 2.0 | Aids in deoxidation and improves hot workability. |
| Silicon (Si) | ≤ 1.0 | Enhances oxidation resistance and acts as a deoxidizer. |
| Phosphorus (P) | ≤ 0.045 | Controlled to minimize brittleness. |
| Sulfur (S) | ≤ 0.030 | Reduces hot cracking during welding when kept at low levels. |
Mechanical Properties
347H exhibits robust mechanical performance, especially under high-temperature conditions:
| Property | Minimum Value | Testing Condition |
|---|---|---|
| Tensile Strength | 515 MPa (75,000 psi) | Room temperature |
| Yield Strength (0.2% offset) | 205 MPa (30,000 psi) | Room temperature |
| Elongation (in 50 mm) | 40% | After annealing |
| Hardness (HRB) | 95 (max) | Room temperature |
Key Characteristics & Advantages
- High-Temperature Stability: Maintains strength and structure at temperatures up to 816°C (1500°F), resisting creep and oxidation.
- Corrosion Resistance: Niobium stabilization prevents sensitization (carbide formation at grain boundaries), even after welding, reducing intergranular corrosion risk.
- Weldability: Suitable for most welding processes (e.g., TIG, MIG) without significant loss of mechanical properties.
- Formability: Can be cold-worked (e.g., bending, rolling) and hot-formed (e.g., forging) with proper process control.
Typical Applications
347H stainless steel is widely used in industries requiring both heat resistance and corrosion resistance:
| Industry | Applications |
|---|---|
| Power Generation | Boiler tubes, superheaters, reheaters, and high-pressure steam pipelines. |
| Petrochemical | Refinery equipment, catalytic crackers, and high-temperature process piping. |
| Chemical Processing | Reactors, heat exchangers, and pipelines handling corrosive fluids. |
| Aerospace | Exhaust systems and high-temperature structural components. |
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Company
JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
Location
No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
Contact Person
Gao Ben