Harsh Metalloys, a top-notch manufacturer and supplier based in Mumbai, India, specializes in high-performance Stainless Steel 347H Tubing, perfect for high-temperature and pressure applications. SS 347H is a stabilized austenitic stainless steel alloy that boasts a higher carbon content than the standard 347, specifically designed to improve creep resistance and mechanical strength. With niobium (columbium) added for stabilization, it effectively resists intergranular corrosion and can handle repeated heating within the temperature range of 427–899°C. Our SS 347H tubing is crafted in accordance with ASTM A213 and ASTM A269 standards, making it an excellent choice for chemical processing, heat exchangers, refinery systems, and power generation units.
When it comes to composition and mechanical properties, Stainless Steel 347H Tubing features around 17–20% Chromium, 9–13% Nickel, and a higher Carbon content (0.04–0.10%) compared to SS 347. The alloy is stabilized with Columbium (Nb) to avoid carbide precipitation during welding or extended heat exposure. SS 347H delivers a tensile strength ranging from 515–690 MPa, showcasing remarkable resistance to creep, stress rupture, and oxidation at temperatures up to 870°C. It maintains good ductility and toughness even under high-temperature conditions, is non-magnetic when annealed, and offers excellent weldability and corrosion resistance, particularly in high-temperature, corrosive environments.
| Specifications | ASTM A/ASME SA213/A249/A269/A312/A358 |
| Dimensions | ASTM, ASME, and API |
| Size | 1/8″NB TO 30″NB IN |
| 304 Pipes & Tubes Size | 1/2″ NB – 16″ NB |
| ERW 304 Pipes & Tubes | 1/2″ NB – 24″ NB |
| EFW 304 Pipes & Tubes | 6″ NB – 100″ NB |
| Thickness | 0.3mm – 50 mm |
| Specialized in | Large Diameter Size |
| Schedule | SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, SCH 80S, SCH60, SCH80, SCH120, SCH140, SCH160, SCH XXS, SCH XS |
| Type | Seamless / ERW / Welded / Fabricated / LSAW Pipes |
| Form | Round, Square, Rectangular, Hydraulic, Oval, U Shape, Pan Cake Coils, Coiled Etc |
| Length | Single Random, Double Random & Required Length. |
| End | Plain End, Beveled End, Treaded |
| Stainless Steel | Nickel | Magnesium | Silicon | sulfur | Carbon | Chromium | Phosphorus | Molybdenum | Nitrogen | |
| 347H | Minimum | 9 | 00.04 | 17 | 3 | |||||
| Maximum | 13 | 2 | 1 | 00.030 | 00.10 | 19 | 00.045 | 4 | ||
| SS Grade | Tensile Strength | Yield Strength | Elongation | Hardness | |
| Rockwell B | Brinell | ||||
| SS 347H | 515 | 205 | 40 | 92 | 201 |
Contact us to get a quick quote for your requirement.
We offers highest quality in its Stainless Steel 347H Tubing with severe testing and certification. Each product is thoroughly checked for dimensional measurements, mechanical tests, and corrosion resistance. Full certification including MTCs will be provided by us for your assurance that all the international standards and requirements are met.
This high-temperature-resistant seamless tubing boasts impressive corrosion resistance and creep strength, making it perfect for applications like heat exchangers, power plants, chemical processing, and high-pressure piping systems in refineries.
Our sturdy welded tubing features a stabilized chromium-niobium alloy, delivering exceptional strength, corrosion resistance, and durability for demanding applications such as exhaust systems and thermal equipment.
Engineered for thermal efficiency and corrosion resistance, these tubes excel under high pressure and heat, making them ideal for use in condensers, heat exchangers, and chemical process systems.
This precision tubing is designed for critical instrumentation systems, providing high strength, oxidation resistance, and dimensional stability in environments like aerospace, petrochemical, and power generation.
Crafted for high-temperature service in boilers, these tubes offer excellent creep strength, thermal fatigue resistance, and corrosion resistance, making them suitable for high-pressure steam and superheater applications.
U-bent for compact heat exchanger setups, these tubes maintain their strength and corrosion resistance even under extreme thermal cycling, perfect for petrochemical, refinery, and marine heat systems.
Designed for condenser systems, these tubes are resistant to acidic corrosion and scaling, ensuring efficient heat transfer and longevity in power generation and industrial cooling processes.
These fin-enhanced tubes provide superior heat transfer, combining strength and oxidation resistance for use in air-cooled heat exchangers, process heaters, and industrial HVAC systems.
Stainless Steel 347H Tubing is widely used in high-temperature, high-pressure environments such as heat exchangers, boilers, superheaters, and furnace tubes. It is especially suited for applications in chemical plants, petroleum refineries, and power generation facilities where resistance to creep, corrosion, and thermal fatigue is essential. SS 347H is also ideal for nuclear reactor components, aerospace exhaust systems, and high-temperature chemical processing pipelines. Its stabilized composition ensures durability and long-term performance in environments involving frequent thermal cycling and aggressive media, making it a preferred material for critical and demanding industrial applications.
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