Neil Metals stands out as a top manufacturer and supplier of Stainless Steel 347H Flat Bar, proudly based in Kolkata, India. They specialize in high-performance stainless steel products that are built to thrive in high-temperature and high-pressure environments. Renowned for its exceptional stability, strength, and resistance to intergranular corrosion, Stainless Steel 347H is perfect for tough industrial applications. Neil Metals employs cutting-edge technology and rigorous quality control measures to ensure their flat bars meet international standards. With a strong commitment to customer satisfaction, timely deliveries, and tailored solutions, they cater to a diverse array of industries, including petrochemical, power generation, and aerospace, both in India and around the globe.
Stainless Steel 347H Flat Bar is essentially a high-carbon variant of 347 stainless steel, enhanced with niobium (columbium) to boost its resistance to sensitization and intergranular corrosion. Typically, it contains 17–20% chromium, 9–13% nickel, and ≤0.10% carbon, along with stabilizing elements like niobium. This alloy boasts a tensile strength of about 515 MPa and a yield strength of 205 MPa, along with excellent creep resistance at elevated temperatures. The higher carbon content significantly enhances its performance in high-temperature and pressure situations, making it ideal for continuous operation in extreme conditions.
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.
You’ll find Stainless Steel 347H Flat Bar widely used in high-temperature and high-stress applications across various sectors. It’s commonly utilized in heat exchangers, boilers, superheaters, furnace components, and high-pressure steam systems. Thanks to its impressive resistance to oxidation and intergranular corrosion post-welding, it’s a go-to choice for equipment in chemical processing, power plants, and petroleum refineries. Its formability and durability also make it a great fit for structural applications in the aerospace and marine industries. With robust mechanical properties and excellent heat resistance, 347H flat bars are reliable for extended use in demanding service conditions.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Neil Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Kolkata, India
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