Steel 347 and 347H Flanges are high-strength, corrosion-resistant austenitic stainless steels that offer excellent mechanical properties and elevated temperature resistance. These alloys are widely used in various industrial applications, and their versatility extends to the realm of flanges, where they play a crucial role in connecting pipes, valves, and other components in piping systems.
Chemical Composition: Stainless Steel 347 is a stabilized alloy with niobium that provides improved intergranular corrosion resistance. The addition of niobium also promotes high-temperature strength. Stainless Steel 347H is the high-carbon version of 347, designed for enhanced creep resistance. Both alloys exhibit a similar chemical composition, primarily composed of iron, chromium, nickel, and small amounts of other elements.
Properties: The key properties of Stainless Steel 347/347H include exceptional corrosion resistance, high-temperature strength, and good mechanical properties. These alloys can withstand prolonged exposure to elevated temperatures, making them suitable for applications in heat exchangers, boiler tubes, and other high-temperature environments.
Table Of Content
Flanges: Flanges are integral components in piping systems, providing a means to connect pipes, valves, and other equipment. Stainless Steel 347/347H flanges are preferred in applications where corrosion resistance and elevated temperature performance are critical. These flanges come in various types, including slip-on, weld neck, socket weld, and blind flanges, each serving specific purposes in different piping configurations.
Applications: The applications of Stainless Steel 347/347H flanges are diverse and include industries such as chemical processing, petrochemical, oil and gas, pharmaceuticals, and more. Their ability to withstand corrosive environments and high temperatures makes them suitable for demanding conditions.
ASTM A182 / ASME SA182, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
1/2" (15 NB) to 48" (1200NB)
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Forged / Threaded / Screwed / Plate
Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange.
All Flanges are marked as follows: Grade, Standard, Thickness, Heat No. (Or according to the customer’s request.)
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 347 | S34700 | – | X6CrNiNb18-10 | 1.4550 | – | – | – |
| 347H | S34709 | – | – | 1.4961 | – | – | – |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347 | min. | – | – | – | – | – | 17.0 | 2.00 | 9.0 | – |
| max. | 0.08 | 2.0 | 1.00 | 0.045 | 0.030 | 20.0 | 3.00 | 13.0 | – | |
| 347H | min. | 0.04 | – | – | – | – | 17.0 | 3.00 | 9.0 | – |
| max. | 0.10 | 2.0 | 1.00 | 0.045 | 0.030 | 19.0 | 4.00 | 13.0 | – | |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347 | min. | – | – | – | – | – | 17.0 | 2.00 | 9.0 | – |
| max. | 0.08 | 2.0 | 1.00 | 0.045 | 0.030 | 20.0 | 3.00 | 13.0 | – | |
| 347H | min. | 0.04 | – | – | – | – | 17.0 | 3.00 | 9.0 | – |
| max. | 0.10 | 2.0 | 1.00 | 0.045 | 0.030 | 19.0 | 4.00 | 13.0 | – | |
Oil & Gas Industrires
Chemical Industries
Construction Industries
Offshore Pipelines & Pipe Works
Petrochemical Industry
Shipbuilding Industries
Hydraulic Applications
Piping Systems
Refining Industry
Food Processing Industry
Pulp & Paper Industry
Power Plant Industry
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