Harsh Metalloys is a leading manufacturer and supplier of SS 348H Bars in Mumbai, India, offering high-performance stainless steel bars designed for elevated temperature applications. SS 348H is a stabilized austenitic stainless steel with enhanced carbon content and niobium additions, making it ideal for high-temperature and pressure environments. Our SS 348H bars are known for their superior strength, excellent corrosion resistance, and reliable performance under thermal stress. With a strong focus on quality, precision, and timely delivery, Harsh Metalloys serves industries such as petrochemical, heat exchangers, power plants, and oil & gas across domestic and international markets.
SS 348H Bars are composed of 17–20% chromium, 8–13% nickel, with niobium (columbium) for stabilization and a higher carbon content (≥0.04%) to enhance creep strength. These bars exhibit tensile strength of 515–760 MPa and yield strength above 205 MPa. The alloy offers excellent resistance to intergranular corrosion, oxidation, and thermal fatigue. SS 348H maintains its mechanical integrity at elevated temperatures and has good weldability and formability. The non-magnetic, austenitic structure provides stability under thermal cycling, making these bars ideal for applications requiring consistent performance in high-stress and high-heat conditions.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 348H | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 17 – 19 | – | 9 – 13 | – |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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All Stainless Steel 348H Bars are thoroughly tested at Harsh Metalloys to ensure quality and performance. Our products are certified to the international standards and tested for mechanical strength, corrosion resistance, and high-temperature durability. We provide MTC, third-party inspection reports, and international specifications for assurance.
348H round bars offer high-temperature strength and corrosion resistance, ideal for aerospace, chemical processing, and nuclear applications requiring durability and reliable performance under extreme conditions.
348H flat bars provide excellent resistance to oxidation and intergranular corrosion, suitable for heat exchangers, boiler tubes, and furnace components in high-temperature industrial environments.
348H square bars are used in high-stress applications, offering superior strength and stability for structural components in aerospace, chemical, and nuclear industries.
348H rectangular bars deliver robust performance in high-temperature environments, ideal for critical components in chemical processing equipment, heat exchangers, and nuclear reactors.
348H hexagonal bars provide excellent mechanical properties and corrosion resistance, perfect for fasteners, fittings, and other components in demanding aerospace and industrial applications.
348H T-bars offer high strength and corrosion resistance, suitable for structural support in high-temperature environments such as chemical plants and power generation facilities.
SS 348H Bars from Harsh Metalloys are used extensively in industries requiring materials that perform reliably at elevated temperatures and in corrosive environments. Key applications include heat exchanger tubes, boiler components, superheater tubes, nuclear and power plant equipment, and chemical process systems. These bars are also suitable for furnace parts, refinery piping, and thermal processing systems. The high carbon content and stabilization with niobium make them resistant to sensitization and intergranular corrosion, ensuring long-term service in high-heat applications. SS 348H bars provide superior mechanical strength, durability, and resistance to thermal stress, making them essential for critical industrial applications.
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