Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of top-notch Stainless Steel 347 Flat Bars, perfect for high-temperature and corrosion-resistant industrial uses. SS 347 is a niobium-stabilized austenitic stainless steel, specifically crafted to resist intergranular corrosion after welding and during high-temperature service. With a focus on precise dimensions, a smooth surface finish, and rigorous quality control, these flat bars guarantee outstanding mechanical reliability and a long lifespan. Hemi Metals provides SS 347 flat bars to industries like petrochemical, power generation, refinery, and heavy engineering, where thermal stability and structural strength are crucial.
Stainless Steel 347 is made up of about 17–19% chromium and 9–13% nickel, with niobium included to prevent carbide precipitation. This unique blend offers remarkable resistance to intergranular corrosion and solid oxidation resistance at high temperatures. Typically, SS 347 flat bars boast a tensile strength of around 515 MPa and a yield strength close to 205 MPa, along with good ductility and impact toughness. These bars are non-magnetic when annealed, have dependable weldability, and maintain consistent mechanical performance even after extended exposure to moderately high temperatures.
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 347 | 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 347 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 347 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 347 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 347 Flat Bars find extensive use in high-temperature and welded structural applications where corrosion resistance and mechanical strength are vital. They are commonly found in boiler structures, heat exchanger frames, furnace components, exhaust system supports, and pressure vessel parts. In the petrochemical and power generation sectors, SS 347 flat bars are utilized for valve bodies, pipeline supports, structural frames, and expansion joints. They are also employed in chemical processing equipment and thermal processing systems, thanks to their excellent weldability, oxidation resistance, and long-term durability.
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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