Harsh Metalloys, a well-respected manufacturer and supplier located in Mumbai, India, specializes in high-quality Stainless Steel 348H Tubing designed for high-temperature and high-stress environments. SS 348H is a stabilized austenitic stainless steel alloy, enhanced with Columbium (Niobium) to boost its resistance to intergranular corrosion and to prevent carbide precipitation during welding. With a higher carbon content compared to SS 348, it offers better creep resistance and strength at elevated temperatures. Our SS 348H tubing meets ASTM A213 and ASTM A269 standards, ensuring outstanding performance in heat exchangers, pressure vessels, and furnace applications across the chemical, petrochemical, and power industries.
Stainless Steel 348H Tubing generally consists of 17–20% Chromium, 9–13% Nickel, and a higher Carbon content (0.04–0.10%) to enhance its strength at high temperatures. It’s stabilized with Columbium (C≥5xNb) to avoid sensitization during welding. This alloy boasts a tensile strength of about 515–690 MPa and excellent oxidation resistance at temperatures reaching up to 870°C. SS 348H is non-magnetic in its annealed state and maintains impressive mechanical properties even in extreme thermal conditions. Its exceptional creep and stress rupture resistance make it perfect for applications that require continuous exposure to high heat and pressure.
| Sizes: | 1/8″ to 24″ |
| ASTM A312 Steel grades: | TP304/304L/304H |
| ASTM A312 Schedules: | STD, XS, XXS, SCH5S, SCH10/10S, SCH20, SCH30, SCH40/40S, SCH60, SCH80/80S, SCH100, SCH120, SCH140, SCH160 |
| Standards: | ASTM A312, ASME SA312 |
| Lengths: | SRL and DRL 5meters up to 11meters available from Stock or Production. |
| Ends: | Plain/Bevelled |
| AISI 348H Chemical Properties | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Cr | Ni | Cb | Co | Ta |
| 0.08 Max | 2.00 Max | 0.045 Max | 0.030 Max | 1.00 Max | 17.0-20.0 | 9.0-13.0 | 1.10 Max | 0.20 Max | 0.10 Max |
| Yeild strength | Tensile strength | Elongation | Reduction |
| Min 0.2% Mpa | Min Mpa | Min % | Min % |
| 205 | 515 | 30 | 50 |
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We maintains the maximum quality levels by conducting a serious testing and testing certification process to ensure Stainless Steel 348H Tubing quality. Each of the products, before they reach the customers’ doorstep, will undergo proper tests including dimensional verification, chemical analysis, and some mechanical testing procedures. The respective company issues an MTR ensuring the material conformity to international norms and specifications.
348H seamless tubing is known for its impressive high-temperature strength and resistance to corrosion, making it a perfect fit for pressure systems and demanding industrial applications like refineries and chemical plants.
348H welded tubing offers a great blend of thermal stability and corrosion resistance, making it suitable for high-temperature applications that are less critical, particularly in power generation, petrochemical, and process industries.
348H heat exchanger tubes excel in creep resistance and thermal conductivity, specifically designed for effective heat transfer in high-temperature environments such as chemical processing, oil refining, and nuclear reactors.
348H instrumentation tubing guarantees precise dimensions, clean internal surfaces, and strong corrosion resistance, making it perfect for control systems that operate in high-heat and corrosive settings.
348H boiler tubes are built to withstand prolonged exposure to high temperatures and pressures, making them ideal for steam boilers and superheater tubes in both thermal and nuclear power plants.
348H U-tubes are designed for efficient heat transfer in compact exchangers, boasting excellent stress rupture properties for high-pressure, high-temperature conditions in the chemical and energy sectors.
348H condenser tubes are resistant to oxidation and thermal fatigue, making them well-suited for use in condensers at power plants and refineries that face severe cyclic thermal conditions.
348H fin tubes increase surface area for better heat transfer, commonly used in air-cooled heat exchangers, economizers, and various heat recovery systems in challenging environments.
Stainless Steel 348H Tubing is extensively used in high-temperature services such as heat exchangers, superheaters, boiler tubes, and pressure vessels in power generation and chemical processing industries. Its ability to withstand thermal cycling and resist intergranular corrosion makes it suitable for reactor cores, high-pressure steam lines, and petrochemical refinery systems. SS 348H tubing is also ideal for furnace components, aerospace exhaust systems, and oil and gas processing pipelines. Its stabilized structure ensures long-term durability and reliability, even under extreme temperature and pressure conditions, making it a preferred choice for critical thermal and structural applications.
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