Stainless Steel 347H Flat Bar is sourced from a reputable manufacturer and supplier in Safat, Kuwait, known for delivering top-notch flat bars that excel in high-temperature and corrosive environments. As a high-carbon variant of grade 347, SS 347H boasts enhanced creep strength and outstanding resistance to intergranular corrosion. These flat bars are crafted with a superb surface finish, precise dimensions, and impressive mechanical strength to meet the rigorous demands of various industries. In Kuwait, Stainless Steel 347H Flat Bar is favored for its remarkable thermal stability, durability, and weldability, making it a go-to choice for petrochemical equipment, heat exchangers, and high-temperature processing systems.
Stainless Steel 347H Flat Bar is composed of 17–19% chromium and 9–13% nickel, featuring niobium stabilization and a higher carbon content than standard 347, which enhances its strength at elevated temperatures. This unique composition provides excellent resistance to intergranular corrosion, oxidation, and carbide precipitation during welding. On the mechanical side, SS 347H delivers high tensile and yield strength, exceptional creep resistance, and reliable performance even at temperatures up to 900°C. The alloy maintains good toughness and structural integrity under thermal stress while also offering solid formability and weldability, making it perfect for critical high-temperature applications.
Dimensions : ASTM, ASME
Standard : ASTM / ASME SA A582, A276, A564, ASTM A484, 484M
Surface : hrap, hot rolled pickled or sand blasting finished, cold drawn, polished, hairline
Range : Range – 3.17mm to 350mm dia
| Element | C | Cr | Mn | Ni | P | S | Si |
| SS 347 | 0.08 max. | 17.0 – 19.0 | 2.00 max. | 9.0-13.0 | 0.045 max. | 0.03 max. | 0.75 max. |
| SS 347H | 0.04 – 0.10 | 17.0 – 19.0 | 2.00 max. | 9.0-12.0 | 0.045 max. | 0.03 max. | 0.75 max. |
| Element | Density | Melting Range,℃ | Tensile Strength | Yield Strength | Elongation | Hardness (Brinell) |
| SS 347H | 7.96 | 1450 ℃ | 515 | 205 | 40 | 201 |
| STANDARD | WERKSTOFF NR. | UNS |
| SS 347 | 1.4961 | S34700 |
| SS 347H | 1.4550 | S34709 |
The primary alloying element in Stainless Steel 347H is niobium (Nb), which stabilizes the material against carbide precipitation during welding and high-temperature exposure. This enhances its resistance to intergranular corrosion and improves its overall high-temperature strength.
Stainless Steel 347H is most suitable for applications in the temperature range of 800°C to 1500°F (427°C to 815°C). This range allows it to maintain its strength, corrosion resistance, and stability, particularly in high-temperature environments like furnaces.
Typical dimensions of a Stainless Steel 347H flat bar range from 0.25 inches (6 mm) to 6 inches (150 mm) in thickness and 1 inch (25 mm) to 12 inches (300 mm) in width. Custom sizes are also available.
Stainless Steel 347H Flat Bar finds extensive use in industries that demand materials capable of enduring extreme heat and corrosive conditions. It’s a common choice in petrochemical plants for components like heat exchangers, furnace parts, and thermal equipment. The power generation sector relies on it for boiler tubes, superheaters, and high-temperature piping systems, thanks to its superior creep strength. In chemical processing, it’s utilized for reactors, tanks, and pipelines that come into contact with aggressive media. SS 347H Flat Bar is also used in aerospace applications, showcasing its versatility and reliability in challenging environments.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Nimish Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Safat, Kuwait
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