Stainless Steel 347 and 347H Pipes & Tubes supplied by Neonox Overseas are high-quality austenitic stainless steels stabilized with niobium, making them especially suitable for high-temperature applications where carbide precipitation and intergranular corrosion can be a concern. Grade 347 is known for its excellent resistance to oxidation and corrosion in strongly oxidizing environments, as well as its superior creep and stress rupture properties compared to standard 304 and 321 stainless steels. Grade 347H is a higher carbon version of 347, developed to offer even better strength retention at elevated temperatures, making it an ideal choice for boilers, superheaters, heat exchangers, and refinery equipment.
Neonox Overseas manufactures and exports Stainless Steel 347/347H Pipes & Tubes in a wide range of types including Seamless, Welded, ERW, EFW, Fabricated, and LSAW pipes to meet diverse industrial requirements. These pipes and tubes are produced as per international standards such as ASTM A312, A213, A269, A358, and ASME SA312/SA213, ensuring global quality compliance. The dimensions range from 6 mm to 610 mm outer diameter with wall thickness between 0.5 mm to 50 mm, and lengths available up to 12 meters or custom cut sizes, providing flexibility for engineering and fabrication projects.
The mechanical properties of Stainless Steel 347/347H are well-suited for harsh service environments. With a minimum tensile strength of 515 MPa, yield strength of 205 MPa, elongation of 40%, and hardness up to 201 HB, these pipes and tubes deliver robust performance in demanding conditions. Their density of 8.0 g/cm³ and melting range of 1400–1425 °C ensure durability under both cryogenic and high-temperature operations. The addition of niobium provides superior resistance to intergranular corrosion after welding, which is a critical advantage in petrochemical, power generation, and chemical processing industries.
Applications of 347/347H Pipes & Tubes are widespread across multiple sectors. They are extensively used in boilers, pressure vessels, chemical plants, refineries, marine environments, heat exchangers, and nuclear power applications. Their excellent weldability, machinability, and ability to withstand highly corrosive and high-pressure environments make them a trusted material for mission-critical operations.
At Neonox Overseas, we are committed to delivering premium quality stainless steel pipes and tubes that meet international standards. Our Stainless Steel 347 and 347H Pipes & Tubes undergo stringent quality testing, including PMI, mechanical tests, hydrostatic tests, and non-destructive examinations to ensure reliability. With global exports across the USA, Europe, Middle East, Asia, and Africa, we continue to be a preferred supplier for industries seeking high-performance stainless steel solutions.
| Property | 347 | 347H |
|---|---|---|
| UNS Number | S34700 | S34709 |
| EN Number | 1.4550 | 1.4961 |
| Equivalent Standards | ASTM A312 / A213 / A269 / A358 / A249 / A554 / ASME SA312 / SA213 | |
| Product Types | Seamless Pipes, Welded Pipes, ERW Pipes, EFW Pipes, Fabricated Pipes, LSAW Pipes, Seamless Tubes, Welded Tubes | |
| Outer Diameter (OD) | 6 mm to 610 mm | |
| Wall Thickness | 0.5 mm to 50 mm | |
| Length | Up to 12 Meters (Custom Cut Lengths Available) | |
| Density (g/cm³) | 8.0 | |
| Melting Point (°C) | 1400–1425 | 1400–1425 |
| Tensile Strength (MPa) | 515 min | 515–750 |
| Yield Strength (0.2% MPa) | 205 min | 205 min |
| Elongation (%) | 40 | 40 |
| Hardness (HB, max) | 201 | 201 |
| Corrosion Resistance | Excellent resistance to intergranular corrosion, oxidation, and stress rupture at elevated temperatures | |
| Weldability | Excellent | Good (due to higher carbon content) |
| Applications | Boilers, Superheaters, Heat Exchangers, Petrochemical Plants, Refineries, Marine Applications, Nuclear Power, Pressure Vessels | |
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