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ASTM A240 347H Stainless Steel Plate UNS S34709 with High Carbon and Creep Strength up to 1500°F
| MOQ: | 5Ton |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A240 347H stainless steel plate for global distributors, fabricators, equipment manufacturers, and EPC contractors requiring high-temperature strength and creep resistance. Produced to ASTM A240/A240M as UNS S34709 (also equivalent to EN 1.4961 and SUS 347H), this high-carbon variant of 347 stainless steel is specifically engineered for sustained elevated-temperature service where creep and stress-rupture performance are critical .
347H is the high-carbon version of 347, with carbon content controlled to 0.04-0.10%—higher than standard 347 (≤0.08%) . The higher carbon provides enhanced creep and stress-rupture performance at temperatures above 1000°F (537°C) . Niobium stabilization (typically ≥10× carbon content) prevents chromium carbide precipitation during welding or high-temperature exposure, preserving intergranular corrosion resistance in the 800-1500°F (427-816°C) service range . The alloy offers good oxidation resistance up to 1500°F (816°C) and is commonly used for superheaters, reheaters, steam piping, and petrochemical heat exchangers .
| Dimension | Specification |
|---|---|
| Product Name | ASTM A240 347H Stainless Steel Plate |
| Product Alias | UNS S34709 Plate / EN 1.4961 Plate / SUS 347H Sheet / High Carbon 347 Plate / X8CrNiNb16-13 |
| Material Type | Niobium-Stabilized Austenitic Stainless Steel (High Carbon) |
| Key Feature | High carbon (0.04-0.10%) provides enhanced creep strength and stress-rupture performance at temperatures above 1000°F (537°C) |
| Chemical Composition | Cr 17.0-19.0% / Ni 9.0-13.0% / C 0.04-0.10% / Nb ≥10×C% (max 1.0%) / Fe Balance |
| Mechanical Properties | Tensile ≥515 MPa / Yield ≥205 MPa / Elongation ≥40% / Hardness ≤95 HRB |
| Physical Properties | Density ~8.0 g/cm3 / Elastic Modulus ~193 GPa / Melting Point ~1400-1425°C |
| Manufacturing Process | Hot Rolling / Cold Rolling / Solution Annealing / Rapid Cooling |
| Surface Finish | 2B / BA / No.1 / No.4 / HL / 8K |
| Primary Applications | Superheater Tubes / Boiler Components / Petroleum Refining / Solar Power / Power Generation / Pressure Vessels |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A240/A240M, ASTM A480, ASME SA-240 |
| Grade Equivalents | UNS S34709 / EN 1.4961 / JIS SUS 347H |
| Thickness | Cold Rolled: 0.4-6.0mm; Hot Rolled: 6.0-200mm (heavier on request) |
| Width | 1000mm, 1219mm (4ft), 1500mm, 2000mm, or customized |
| Length | 2000mm-12000mm (standard 4×8ft: 1219×2438mm) or customized |
| Surface Finish | 2B / BA / No.1 / No.4 / HL / 8K |
| Edge Condition | Mill Edge / Slit Edge / Sheared Edge |
| Inspection | PMI / Tensile Test / Hardness Test / Intergranular Corrosion Test (ASTM A262) |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A240 347H stainless steel plate is specified for applications requiring enhanced creep strength and high-temperature structural performance.
Typical applications include:
- Superheater and reheater tubes
- Steam piping and fired-heater tubing
- Fluid catalytic cracking units (FCC) and petroleum refining equipment
- Solar thermal power generation molten salt storage tanks (10-36mm thickness)
- Hanger rods, recuperator tube sheets, and furnace supports
- Pressure vessels in high-temperature service
- Chemical processing and petrochemical heat exchangers
- Equipment resistant to polythionic acid stress corrosion
Key selection considerations: 347H is the grade of choice for high-temperature applications above 1000°F where enhanced creep resistance is required . The higher carbon content provides deliberate carbide strengthening that improves high-temperature load-bearing capacity compared to standard 347. At 600°C (1112°F), 347H offers a creep-rupture strength of 166 MPa over 10,000 hours and 115 MPa over 100,000 hours . The niobium stabilization allows welding without post-weld annealing . In most instances, the carbon content enables dual certification as both 347 and 347H .
Shangyou Stainless Steel provides value-added processing including cut-to-length, slitting, polishing, laser cutting, bending and forming, and protective film application.
All plates are packed with export-standard protection including protective paper between sheets, edge protection, steel strapping, waterproof wrapping, and wooden pallets or steel frames.
Quality documents include MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection (SGS, TUV, BV) can be arranged upon request.
1. What is the difference between 347 and 347H stainless steel?
The primary difference is carbon content. 347H has 0.04-0.10% carbon (higher than 347 at ≤0.08%), providing enhanced creep strength and stress-rupture performance at temperatures above 1000°F (537°C) .
2. What is the UNS number for 347H?
UNS S34709 is the designation for 347H stainless steel .
3. What is the EN equivalent for 347H?
EN 1.4961 (X8CrNiNb16-13) is the European equivalent for UNS S34709 / 347H .
4. What is the maximum service temperature for 347H?
347H offers good oxidation resistance and creep strength up to 1500°F (816°C), with meaningful proof strength retained into the 550-850°C service range .
5. What thickness ranges are available for 347H plate?
Cold rolled sheet from 0.4mm to 6.0mm; hot rolled plate from 6.0mm to 200mm. Heavier thicknesses available on request .
6. What is the creep strength of 347H at elevated temperatures?
At 600°C (1112°F), 347H offers 166 MPa over 10,000 hours and 115 MPa over 100,000 hours .
7. Is 347H stainless steel magnetic?
347H is fully austenitic and non-magnetic in the annealed condition.
8. Can 347H be welded?
Yes. 347H offers excellent weldability. The niobium stabilization eliminates sensitization in the heat-affected zone, allowing welding without post-weld annealing .
9. What documents are provided with delivery?
MTC 3.1, inspection reports, packing list, and heat number traceability.
10. Is third-party inspection available?
Yes, SGS, TUV, or BV upon request.
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Need ASTM A240 347H stainless steel plate for high temperature boiler, superheater, or petroleum refining applications requiring enhanced creep strength? Send requirements including grade, thickness/width/length, surface finish, quantity, and application.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
