Stainless Steel 347H
Plate, Pipe, Tube & Bar | ASTM A240 / A213 / A182
High-temperature stabilized stainless steel ideal for pressure vessels, boilers, and thermal processing. Stock available globally.
Updated: July 2025
Stainless Steel 347H Plate | 1500 × 3000 mm | Thickness: 5 – 40 mm
4.9
6.4
5.6
Stainless Steel 347H Pipe (Seamless/Welded) | OD: Custom | Wall: Custom
6..2
8.1
7.0
Product Form Minimum Order
** Trial orders possible for qualified EPC and plant users.
Beyond Certified: Introducing The Alloy360 VANTAGE™ Program
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- Certified 347H stainless in plate, pipe, and bar – ready for shipment.
Forms: Plate / Seamless Pipe / Welded Pipe / Bar / Tube
Standards: ASTM A240, A213, A182
UNS: S34709
W.Nr.: 1.4961
Property
value
FAQs
347H has a higher carbon content than standard 347, which enhances its strength at elevated temperatures. This makes it better suited for pressure vessels and boiler tubes operating at 550°C and above.
Yes. 347H has good weldability, but post-weld cleaning is important to remove scale and reduce sensitization risk. For critical welds, use stabilized welding rods like ER347.
In many high-temp environments, yes. 347H offers similar high-temperature strength as 316H but with better intergranular corrosion resistance due to its columbium stabilization. It’s also more cost-effective than 321 in some markets.
347H is rated for service up to ~870°C (1600°F). However, for long-term exposure, the ideal range is below 800°C to minimize embrittlement.
Yes. 347H is commonly used under ASME Section VIII Div. 1 and meets the requirements for pressure and high-temperature service in thermal plants, refineries, and more.
Non-Destructive Testing (NDT):
Destructive Testing (DT):
Certifications:
• EN 10204 3.1 / 3.2
• ASME / ASTM compliance
• TPI: SGS, BV, Lloyd’s, TÜV accepted
** Full traceability, suitable for PED / pressure vessel documentation.
Smart Message
Stainless 347H – Heat-Resistant and Pressure-Ready
Designed for sustained high-temperature service. Stabilized with columbium for excellent creep resistance and intergranular corrosion protection.
Perfect for petrochemical, refining, and thermal plant applications.
Used in high-temp boilers, refineries, and thermal power plants
For heat exchangers, condensers, and superheaters
Ideal for process piping in elevated temperature service