Stainless Steel 321/321H Flanges are critical components in various industrial applications, known for their exceptional corrosion resistance and high-temperature strength. Composed of iron, chromium, nickel, and titanium, these flanges exhibit superior properties, making them suitable for demanding environments.
The designation "321" refers to the basic grade, while "321H" indicates the high carbon version. The inclusion of titanium in their composition offers protection against intergranular corrosion, particularly in high-temperature conditions. This feature makes Stainless Steel 321/321H flanges ideal for applications involving elevated temperatures, such as in the petrochemical, chemical processing, and power generation industries.
Corrosion resistance is a hallmark of these flanges. They provide excellent resistance to a wide range of corrosive media, including acids, alkalis, and various chemical solutions. This corrosion resistance is further enhanced by the presence of titanium, which forms a protective oxide layer on the surface of the flanges.
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Stainless Steel 321 flanges are also valued for their high-temperature strength. They maintain their mechanical properties at elevated temperatures, making them suitable for applications where exposure to heat is a concern. This attribute is crucial in industries where flanges are subjected to challenging conditions, such as in heat exchangers, boilers, and exhaust systems.
The Stainless Steel 321H Flanges are available in various types, including slip-on, weld neck, socket weld, blind, and lap joint flanges, catering to different installation requirements. Additionally, they come in different pressure ratings and sizes to meet specific project needs.
The fabrication of Stainless Steel 321 Flanges adheres to industry standards and specifications, ensuring the highest quality and performance. Common standards include ASTM A182 and ASME B16.5, which outline the requirements for materials, dimensions, and testing procedures.
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.)
| STANDARD | WERKSTOFF NR. | UNS |
| SS 321 | 1.4541 | S32100 |
| SS 321H | 1.4878 | S32109 |
| Grade | Ni | C | Mn | P | S | Si | Cr | Mo | N | TI | |
| 321 | Max | 12.00 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 19.0 | 3 – 4 | 0.10 max | 0.70 |
| Min | 9.00 | - | - | - | - | - | 17.0 | - | - | 5(C+N) | |
| 321H | Max | 12.00 | 0.08 | 2.00 | 0.045 | 0.030 | 1.75 | 19.0 | 3 – 4 | 0.10 | 0.70 |
| Min | 9.00 | 0.04 | - | - | - | - | 17.0 | - | - | 4(C+N) | |
| 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 | ||||
| 321 | 515 | 205 | 40% | 95 | 217 |
| 321H | 515 | 205 | 40% | 95 | 217 |
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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