Luois Metals stands out as a top manufacturer and supplier of Stainless Steel 347 Flat Bars, proudly based in Houston, USA. This type of stainless steel is a stabilized austenitic alloy, renowned for its impressive resistance to intergranular corrosion, especially after welding and exposure to high temperatures. Perfect for tough environments, our SS 347 flat bars are crafted to comply with ASTM A276 and A240 standards. We offer precision-cut flat bars in a variety of thicknesses and lengths, catering to demanding sectors like aerospace, chemical processing, oil & gas, and heat exchanger manufacturing, ensuring top-notch quality and performance with every order.
Stainless Steel 347 is composed of 17–20% chromium, 9–13% nickel, and is stabilized with columbium (niobium) to avoid carbide precipitation during welding. It boasts a tensile strength ranging from 515 to 750 MPa and a minimum yield strength of 205 MPa, maintaining solid mechanical strength even at elevated temperatures. This alloy excels in oxidation resistance and creep strength in high-heat settings. With a density of 8.0 g/cm³, SS 347 is non-magnetic when annealed and offers excellent weldability, formability, and resistance to intergranular corrosion in harsh, oxidizing environments.
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 |
Stainless Steel 347 flat bars find extensive use in high-temperature applications and settings that experience frequent thermal cycling. They are commonly utilized in exhaust manifolds, chemical processing equipment, heat exchangers, refinery components, boiler tubes, and structural parts in aerospace. Thanks to its stabilized structure, SS 347 performs exceptionally well in post-weld conditions without sensitization, making it a great choice for welded pressure vessels and furnace components. It’s also favored in food processing, power generation, and marine industries where corrosion resistance and high-temperature performance are crucial. Luois Metals is committed to delivering SS 347 flat bars that meet these demanding needs.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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