Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of top-notch Stainless Steel 347H Flat Bars, specifically designed for high-temperature and pressure-critical industrial applications. This SS 347H is a niobium-stabilized, high-carbon austenitic stainless steel that excels in creep strength at elevated temperatures. With a focus on precise dimensions, a smooth surface finish, and rigorous quality control, these flat bars ensure outstanding mechanical reliability and thermal stability. Hemi Metals caters to various industries, including power generation, petrochemical, refinery, and heavy engineering, where long-lasting strength and corrosion resistance are crucial.
Stainless Steel 347H is composed of about 17–19% chromium and 9–13% nickel, featuring a higher carbon content and niobium stabilization to prevent carbide precipitation at elevated temperatures. This stabilization not only enhances high-temperature strength but also provides excellent resistance to intergranular corrosion after welding. Typically, SS 347H flat bars boast a tensile strength ranging from 515–620 MPa and a yield strength of about 205–240 MPa, along with good ductility and impressive creep resistance. These bars are non-magnetic when annealed and maintain stable mechanical performance even during extended high-temperature use.
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 Bars find extensive use in high-temperature and pressure-heavy environments where both strength and corrosion resistance are essential. They are commonly utilized in boiler components, superheater and reheater structures, heat exchanger frames, furnace parts, and exhaust system supports. In the petrochemical and power generation sectors, SS 347H flat bars are integral to pressure vessels, pipelines, structural frameworks, and expansion joints. Additionally, they are employed in refinery systems, gas processing units, and thermal processing equipment, thanks to their excellent weldability and oxidation resistance.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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