Stainless Steel 347H Flanges are a carbon-rich variant of the 347 grade designed to have superior strength at high temperatures. They contain iron, 17–19% chromium, 9–13% nickel, with columbium (niobium) and tantalum additions to make them more stable and resistant to corrosion. The stabilizing additions resist intergranular corrosion and carbide precipitation effectively. Mechanical properties are tensile strength of 515–700 MPa, yield strength of 205 MPa, and elongation of 40–50%. With outstanding resistance to 900°C (1652°F), 347H flanges are well-suited for applications in high-stress, high-temperature conditions where both strength and toughness are needed.
Stainless Steel 347H Flanges are a carbon-rich variant of the 347 grade designed to have superior strength at high temperatures. They contain iron, 17–19% chromium, 9–13% nickel, with columbium (niobium) and tantalum additions to make them more stable and resistant to corrosion. The stabilizing additions resist intergranular corrosion and carbide precipitation effectively. Mechanical properties are tensile strength of 515–700 MPa, yield strength of 205 MPa, and elongation of 40–50%. With outstanding resistance to 900°C (1652°F), 347H flanges are well-suited for applications in high-stress, high-temperature conditions where both strength and toughness are needed.
| Standard | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges |
| Size | 1/2″ (15 NB) to 48″ (1200NB) |
| Class/Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Grade | C | Mn | Si | P | S | Cr | Cb | Ni | Fe |
| 347H | 0.08 | 2.0 | 1.0 | 0.045 | 0.030 | 17.00 – 20.00 | 10xC – 1.10 | 9.00 – 13.00 | 62.74 min |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 347H | 515 | 205 | 35 | 92 | 201 |
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SS 347Hsocket weld flanges, manufactured from stainless steel alloy 347H, ensure secure pipe connections with enhanced corrosion resistance and high-temperature strength, suitable for high-pressure systems in various industries.
SS 347H ring type joint flanges, constructed from stainless steel alloy 347H, provide leak-proof connections with excellent corrosion resistance and high-temperature performance, ideal for high-pressure and critical service applications.
SS 347H forged flanges, made from stainless steel alloy 347H, offer superior strength, excellent corrosion resistance, and high-temperature endurance, making them ideal for demanding industrial applications and high-pressure environments.
We conduct various rigorous tests, including dimensional, mechanical, and chemical analysis, to ensure the highest quality of our Stainless Steel 347H Flanges. Our in-house quality control team oversees all processes, complemented by third-party inspections to guarantee compliance with industry standards. With a commitment to prompt delivery we ensure that our clients receive their products on time, every time.
Stainless Steel 347H Flanges find extensive application in processes involving resistance to corrosion and oxidation under severe conditions. They find special application in chemical plants, refineries, and power generation units where equipment needs to be withstood at high pressure and high temperature. Some common applications are in boilers, heat exchangers, reactors, and other process equipment handling aggressive chemicals and thermal cycling. The incorporation of columbium and tantalum gives durability and avoids intergranular corrosion, so these flanges are trustworthy even in harsh surroundings. Their resistance to temperature along with their durability and structural integrity leads them to be the most popular among petrochemical, pharmaceutical, and food processing industries.
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