Harsh Metalloys, a reputable manufacturer and supplier located in Mumbai, India, specializes in high-quality Stainless Steel 347 Flanges that are built to last in tough, high-temperature, and corrosive settings. Crafted from a stabilized austenitic stainless steel alloy enriched with niobium (columbium), these SS 347 flanges are designed to resist intergranular corrosion and carbide precipitation, ensuring they perform reliably in welded applications. Adhering to ASTM A182 and ASME standards, these flanges boast impressive mechanical strength and oxidation resistance even at elevated temperatures. They find extensive use in industries such as petrochemical, power generation, chemical processing, and oil & gas, providing secure, leak-proof pipe connections.
Stainless Steel 347 Flanges are composed of 17–20% Chromium and 9–13% Nickel, with Niobium stabilization (Nb ≥ 10xC) to effectively prevent carbide precipitation and intergranular corrosion. This alloy features a higher carbon content than standard stainless steels, enhancing its creep resistance and strength at high temperatures. SS 347 flanges demonstrate tensile strengths between 515 and 690 MPa and maintain excellent resistance to oxidation and scaling up to 870°C. In their annealed state, these flanges are non-magnetic, highly weldable, and maintain mechanical stability even under thermal cycling and in corrosive environments.
| 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 |
| 347 | 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 | ||||
| 347 | 515 | 205 | 35 | 92 | 201 |
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347 slip-on flanges are designed for easy alignment and offer moderate pressure resistance along with corrosion protection, making them a great choice for low to medium-pressure piping in chemical and industrial systems.
These durable 347 weld neck flanges are built to last, providing high strength and excellent corrosion resistance while handling extreme temperatures, which makes them ideal for high-pressure, critical piping applications.
347 blind flanges are perfect for securely sealing pipe ends in high-temperature, corrosive environments. They are commonly used to isolate sections or safely terminate piping systems.
With 347 socket weld flanges, you get strong, leak-proof joints that resist corrosion, making them suitable for small-diameter, high-pressure industrial and chemical piping systems.
These precision-engineered 347 ring type joint flanges deliver superior sealing capabilities for high-pressure, high-temperature applications in the oil, gas, and chemical industries.
Robust forged 347 flanges provide exceptional strength, durability, and corrosion resistance, making them widely used in heavy-duty industrial, petrochemical, and power plant piping systems.
Stainless Steel 347 Flanges are extensively used in high-temperature piping systems, boilers, heat exchangers, and pressure vessels in chemical, petrochemical, and power generation industries. They are ideal for applications requiring resistance to intergranular corrosion and thermal fatigue, such as refinery plants, oil & gas pipelines, and industrial furnaces. These flanges provide secure, leak-proof joints for welded assemblies exposed to harsh chemical and thermal environments. Additionally, SS 347 flanges are utilized in aerospace, nuclear, and marine sectors where high strength, durability, and corrosion resistance are critical for operational safety and efficiency.
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