Rupal Metals stands out as a leading manufacturer and supplier of Stainless Steel 347 Flat Bars in Delhi, India, providing top-notch stainless steel solutions designed for high-temperature and corrosion-heavy environments. SS 347 is a niobium-stabilized austenitic stainless steel known for its remarkable resistance to intergranular corrosion, particularly after welding and extended heat exposure. These flat bars boast exceptional strength and oxidation resistance even at elevated temperatures. Rupal Metals offers SS 347 flat bars in a variety of sizes and surface finishes, serving industries like chemical processing, aerospace, thermal plants, food processing, and petroleum refining, where stability and reliability under thermal stress are crucial.
Stainless Steel 347 Flat Bars mainly consist of Chromium (17–19%), Nickel (9–13%), and Niobium (Columbium), along with Carbon, Manganese, Silicon, and trace elements. The inclusion of Niobium helps prevent carbide precipitation during welding, enhancing corrosion resistance. SS 347 provides a tensile strength of around 515 MPa and a yield strength of about 205 MPa, along with excellent ductility and creep strength at high temperatures. These flat bars maintain their structural integrity under significant thermal and mechanical loads and are easy to weld and form, making them perfect for heavy-duty and 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 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 are widely utilized in high-temperature settings that demand strong mechanical properties and resistance to intergranular corrosion. Common applications include heat exchangers, boiler tubes, high-temperature ducts, furnace components, and equipment for refineries and chemical plants, as well as aircraft exhaust stacks. The flat design is perfect for structural elements, supports, and reinforcements in thermally stressed systems. SS 347 is especially advantageous in environments that experience repeated thermal cycling and exposure to strong oxidizing agents. Its weldability and stability make it a go-to choice for demanding applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Rupal Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Delhi, India
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