Anucha Metals, a well-respected manufacturer and supplier located in Bangkok, Thailand, specializes in high-quality Stainless Steel 321 Flanges that are built to last. These flanges are designed to withstand heat and provide excellent corrosion protection, making them perfect for demanding applications. Crafted to meet international quality standards, they excel in high-temperature environments and when dealing with corrosive substances. Stainless Steel 321 is an austenitic grade that’s stabilized with titanium, which enhances its resistance to intergranular corrosion and boosts its strength during thermal cycling. Anucha Metals offers a wide range of Stainless Steel 321 Flanges in various types, sizes, pressure classes, and specifications, catering to industries such as petrochemical, oil & gas, power generation, marine, and chemical processing.
The composition of Stainless Steel 321 Flanges includes iron, chromium (17–19%), nickel (9–12%), and titanium, along with carefully controlled amounts of carbon, manganese, silicon, phosphorus, and sulfur. The titanium addition helps stabilize the structure against chromium carbide formation during welding or exposure to high temperatures, which in turn enhances mechanical strength and oxidation resistance. Thanks to their austenitic structure, these flanges provide toughness, good creep strength, and reliable performance at temperatures reaching up to about 870°C, making them ideal for heat-intensive applications.
| Standard | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.5, B 16.47 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) |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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We offers the best quality Stainless Steel 321 Flanges Chanchai Stainless,which has undergone intense testing to produce top quality and performance. The flange is thoroughly tested for meeting international standards and specifications. Products supplied by us are certified by recognized authorities for traceability and reliability in each batch. With modern technology and strict quality control, we ensure durability, corrosion resistance, and good mechanical properties. Chanchai Stainless stands by the delivery of flanges with the highest level of industry standards in functionality and safety.
SS 321 slip-on flanges are designed for high-temperature and corrosion-resistant applications. Made from stainless steel, they provide reliable connections in piping systems, offering ease of installation and durability.
SS 321 weld neck flanges are engineered for high-stress applications, providing strong, reliable connections in piping systems. Crafted from stainless steel, they offer excellent resistance to high temperatures and corrosion.
SS 321 socket weld flanges are ideal for high-pressure and high-temperature applications. Made from stainless steel, they offer strong, reliable connections with ease of installation and excellent resistance to corrosion.
SS 321 blind flanges are used to seal the end of a piping system. Crafted from stainless steel, they provide a robust, corrosion-resistant solution for maintaining system integrity and pressure.
SS 321 ring type joint flanges offer a secure, leak-proof seal in high-pressure environments. Made from stainless steel, they feature a ring groove design for reliable, corrosion-resistant performance in demanding applications.
SS 321 forged flanges are crafted from stainless steel for high strength and durability. They are ideal for demanding applications, offering excellent resistance to high temperatures, corrosion, and mechanical stress.
You’ll find Stainless Steel 321 Flanges commonly used in refinery piping, exhaust manifolds, heat exchangers, furnace parts, boiler equipment, chemical plants, and even aerospace components. They’re perfect for connecting pipes and valves in systems that face high temperatures, corrosive conditions, or frequent temperature changes, all while ensuring mechanical integrity and leak-proof performance. With their impressive stability, durability, and resistance to high-temperature oxidation, Stainless Steel 321 Flanges are the go-to choice for industries looking for long-lasting, secure, and high-performance piping connections.







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