Alloy 20, designated as UNS N08020, is a high-performance nickel-iron-chromium alloy with excellent corrosion resistance in various environments, particularly those containing sulfuric acid. Alloy 20 is also known as Carpenter 20 and provides exceptional resistance to pitting, crevice corrosion, and intergranular corrosion. This makes it a popular choice for applications in chemical processing, pharmaceuticals, food processing, and other industries where corrosion resistance is critical.
Alloy 20 Flanges play a crucial role in connecting pipes, valves, and other equipment in a piping system. These flanges are available in various types, such as slip-on, weld neck, blind, lap joint, threaded, and socket weld flanges, among others. Each type serves specific purposes in different applications, allowing for flexibility and adaptability in diverse industrial settings.
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One of the key features of Alloy 20 flanges is their corrosion resistance, which extends the life of the flanges and the overall integrity of the piping system. The alloy's resistance to sulfuric acid, phosphoric acid, nitric acid, and other corrosive substances makes it a preferred choice in challenging environments. This corrosion resistance is attributed to the alloy's composition, which includes nickel, chromium, molybdenum, and copper.
Alloy 20 Flanges are manufactured to conform to various industry standards such as ASTM B462 and ASME SB462, ensuring high-quality and reliable performance. These standards specify the dimensions, tolerances, and material requirements for Alloy 20 flanges, ensuring compatibility and interchangeability with other components in the system.
The choice of the appropriate type of Alloy 20 flange depends on the specific requirements of the application, including factors such as pressure, temperature, and the nature of the fluid or gas being transported. Alloy 20 Weld neck flanges are suitable for high-pressure applications, while alloy 20 slip-on flanges are commonly used in lower-pressure environments. Alloy 20 Blind flanges are employed to seal the end of a pipe, and threaded flanges provide ease of installation in certain systems.
ASTM B462 / ASME SB462, 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.)
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Alloy 20 | N08020 | 2.4660 | Z2NCUD31-20AZ | NiCr20CuMo | – | – | – |
| Alloy 20 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| 32 – 38 | 0.02 max | 2 – 3 | 1 – 2 | 0.7 max | Bal | 3 – 4 | 0.005 max | 0.02 max | 19 – 21 |
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.1 g/cm3 | 1443 °C (2430 °F) | Psi – 35000 , MPa – 241 | Psi – 80000 , MPa – 551 | 30 % |
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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