Nakamura Stainless, located in Pulau Ujong, Singapore, is a reliable manufacturer and supplier of high-performance stainless steel products, including stainless steel 348H bars. These bars are made for high-temperature applications where excellent mechanical strength, creep resistance, and resistance to intergranular corrosion are essential. Stainless steel 348H is a niobium-stabilized austenitic stainless steel with a higher carbon content. This composition improves strength during prolonged exposure to high temperatures. Nakamura Stainless focuses on precision manufacturing and strict quality control, which makes their 348H bars ideal for critical applications in power plants, chemical processing, and heat exchanger systems.
Stainless steel 348H bars contain about 17% to 19% chromium and 9% to 13% nickel, with added niobium (columbium) to stabilize the alloy against carbide precipitation. The increased carbon content in 348H boosts creep strength and high-temperature performance. These bars usually have a tensile strength between 550 and 750 megapascals and maintain structural integrity at temperatures above 800°C. The niobium stabilization helps prevent intergranular corrosion during welding and thermal cycling, making 348H bars suitable for applications where long-term thermal exposure is a concern.
| 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 Nakamura Stainless 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.
Stainless steel 348H bars are commonly used in high-temperature and corrosive environments, especially in industries such as petrochemical, power generation, and aerospace. Typical applications include boiler tubes, heat exchanger components, pressure vessels, and high-temperature piping systems. Their resistance to oxidation, intergranular corrosion, and thermal fatigue makes them ideal for welded structures and systems exposed to continuous heat. 348H bars offer reliable strength, stability, and corrosion resistance, ensuring long-lasting performance in challenging service conditions.
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