Phehlukwayo Metal, located in Cape Town, South Africa, stands out as a top manufacturer and supplier of high-quality stainless steel products, including the robust Stainless Steel 347H Flat Bars. These bars are specifically crafted for demanding environments where high temperatures and corrosive conditions are the norm. The 347H grade is a high-carbon, stabilized austenitic stainless steel, making it perfect for applications that require pressure containment. With its remarkable resistance to intergranular corrosion and impressive mechanical strength, Stainless Steel 347H is a trusted option for industries that prioritize structural integrity and longevity. At Phehlukwayo Metal, every flat bar is meticulously engineered, rigorously tested to comply with international standards, and delivered with a commitment to quality and customer satisfaction.
The composition of Stainless Steel 347H Flat Bars includes 17–20% chromium, 9–13% nickel, and trace amounts of niobium (columbium) that serve as stabilizers. The higher carbon content (0.04–0.10%) enhances creep resistance and strength at elevated temperatures, making 347H an excellent choice for high-pressure and high-heat applications. These bars boast a tensile strength ranging from approximately 515–750 MPa and a yield strength of about 205 MPa. Niobium plays a crucial role in preventing chromium carbide precipitation during welding, which helps maintain corrosion resistance. Additionally, the alloy retains good toughness, formability, and weldability, even after prolonged exposure to 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 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 sectors like power generation, chemical processing, petroleum refining, and aerospace, where high-temperature strength and resistance to stress corrosion are critical. You’ll often see them in boiler components, heat exchangers, furnace parts, welded pressure vessels, and exhaust ducts. Thanks to their ability to resist intergranular corrosion, these bars are a reliable choice for various 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.
Phehlukwayo Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Cape Town, South Africa
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