Stainless Steel 347/347H Hex Bars are high-performance austenitic stainless steel long products engineered for demanding industrial, mechanical, and structural engineering applications. Steel Icon Stainless Pvt. Ltd. manufactures precision hex bars that deliver reliable strength and excellent resistance to intergranular corrosion, especially in high-temperature environments. These hexagonal stainless steel bars are widely used in fabrication, fastener production, pressure equipment, and critical structural assemblies across refineries, petrochemical plants, and power generation facilities.

The hexagonal shape provides improved grip and torque transmission, making Stainless Steel 347/347H Hex Bars ideal for bolts, nuts, shafts, and machined components. Their consistent dimensional tolerance and superior metallurgical stability ensure dependable performance in environments where temperature fluctuations and corrosive media are common.

What Are Stainless Steel 347/347H Hex Bars?

Stainless Steel 347 and 347H are stabilized austenitic chromium-nickel stainless steels containing columbium, also known as niobium. The addition of niobium stabilizes the material against chromium carbide precipitation, which helps prevent intergranular corrosion after welding or exposure to elevated temperatures. The 347H grade features a higher carbon content compared to 347, enhancing high-temperature strength for applications requiring improved creep resistance. The typical chemical composition includes approximately 17 to 19 percent chromium and 9 to 13 percent nickel, along with controlled niobium additions. This composition forms a stable austenitic microstructure that provides excellent toughness, ductility, and oxidation resistance. Stainless Steel 347/347H Hex Bars maintain mechanical integrity under continuous service temperatures and are well suited for heat exchangers, boiler components, and exhaust systems.

These hex bars exhibit strong tensile properties, reliable yield strength, and good elongation. They resist scaling at elevated temperatures and perform effectively in oxidizing and moderately corrosive environments. Their structural stability and weldability make them suitable for complex fabrication and heavy engineering applications.

Advantages of Stainless Steel 347/347H Hex Bars?

Stainless Steel 347/347H Hex Bars offer superior resistance to intergranular corrosion due to niobium stabilization. This feature is particularly valuable in welded components used in pressure vessels and industrial piping systems. The 347H grade provides enhanced high-temperature strength, making it suitable for thermal processing units and furnace components. Durability is another key advantage. These stainless steel hex bars maintain structural performance under cyclic heating and cooling conditions. Their oxidation resistance ensures long service life in high-temperature industrial settings such as power plants and chemical processing facilities.

In addition, Stainless Steel 347/347H Hex Bars provide good machinability for a stabilized grade. The hexagonal profile supports efficient manufacturing of fasteners and precision components. Their long-term cost efficiency comes from reduced maintenance, lower risk of corrosion-related failures, and dependable mechanical performance in critical equipment.

In petrochemical and refinery operations, Stainless Steel 347/347H Hex Bars Manufacturers supply high-temperature resistant materials for reactor components, heat exchangers, and pressure retaining parts. The material’s ability to withstand prolonged heat exposure makes it suitable for demanding process environments. Within thermal power plants and boiler systems, Stainless Steel 347/347H Hex Bars Suppliers support the fabrication of superheater components, steam lines, and structural supports exposed to elevated temperatures and stress. The enhanced creep resistance of 347H ensures reliable long-term service.

For industrial fabrication and heavy engineering workshops, Stainless Steel 347/347H Hex Bars Stockists maintain ready inventory for fastener manufacturing, shafts, and structural connectors used in high-temperature assemblies. Immediate availability helps reduce project delays and supports maintenance schedules. In international markets serving oil and gas, chemical processing, and infrastructure projects, Stainless Steel 347/347H Hex Bars Exporters deliver certified materials for use in offshore platforms, industrial furnaces, and high-pressure systems. Compliance with global standards ensures consistent quality and traceability across borders.

Stainless Steel 347/347H Hex Bars are manufactured in accordance with ASTM A276 and ASTM A479 specifications for stainless steel bars and shapes used in general and pressure vessel applications. For elevated temperature service and boiler components, ASME SA276 and ASME SA479 are the corresponding standards. These specifications define chemical composition limits, mechanical properties, heat treatment requirements, and testing procedures to ensure suitability for industrial piping systems, heat exchangers, and structural components operating under high stress and temperature conditions. Compliance with these standards ensures consistent quality, certification, and traceability for critical applications.

Steel products such as hex bars, round bars, pipes, tubes, plates, sheets, and coils are classified according to internationally recognized standards including ASTM, ASME, EN, DIN, JIS, and ISO. ASTM and ASME standards are commonly used in North American and Middle Eastern projects, particularly for pressure equipment and industrial fabrication. EN and DIN standards define European material grades, while JIS governs Japanese industrial specifications. ISO standards harmonize testing methods and quality management systems globally. Stainless Steel 347 and 347H are designated based on their alloy composition and performance characteristics, enabling engineers and procurement specialists to specify appropriate materials for structural engineering, process equipment, and high-temperature service applications.

Specification of Stainless Steel 347/347H Hex Bars?

Chemical Composition of Stainless Steel 347/347H Hex Bars?

Mechanical Properties of Stainless Steel 347/347H Hex Bars?

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