Stainless Steel 347 Flat Bar is highly regarded for its outstanding resistance to corrosion, impressive strength at high temperatures, and overall durability, making it a go-to choice for tough industrial and engineering tasks. This titanium-stabilized austenitic stainless steel grade is designed to resist intergranular corrosion and keep its structural integrity even when the heat is on. These flat bars are known for their precise dimensions, excellent surface finish, and reliable mechanical performance, which makes them perfect for applications in chemical processing, aerospace, and high-temperature machinery. With a long lifespan, robust strength, and great corrosion resistance, Stainless Steel 347 Flat Bar stands out as a dependable option for industries that operate in harsh, high-temperature conditions.
The composition of Stainless Steel 347 Flat Bar primarily includes iron, along with about 17–19% chromium, 9–13% nickel, and titanium to stabilize the steel. The addition of titanium helps prevent chromium carbide from forming during welding or when exposed to heat for extended periods, ensuring it remains resistant to intergranular corrosion. This material boasts excellent tensile strength, ductility, and resistance to oxidation at high temperatures. Even when faced with thermal cycling and mechanical stress, Stainless Steel 347 Flat Bar maintains its dimensional stability and structural integrity. Its blend of mechanical performance, corrosion resistance, and heat stability makes it an ideal choice for high-precision industrial components that need to be reliable over the long haul.
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 Bar is widely used across various sectors, including chemical processing, petrochemical, aerospace, power generation, and high-temperature industrial applications. Its exceptional resistance to intergranular corrosion and oxidation makes it suitable for heat exchangers, furnace components, pressure vessels, exhaust systems, and structural frameworks that are regularly exposed to high temperatures. The flat bar shape allows for easy fabrication, machining, and assembly in industrial environments.
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