Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
Add to Cart
ASTM A182 F321H Stainless Steel Flange UNS S32109 Forged WNRTJ Flange
ASTM A182 F321H is a high-temperature, stabilized stainless steel grade used for Weld Neck (WN) Ring Type Joint (RTJ) flanges. These flanges are engineered for extreme environments requiring leak-tight seals, high pressure, and thermal stability. Their titanium-stabilized composition and RTJ design make them indispensable in critical HPHT systems, such as oil and gas, petrochemical, and power generation systems. The "H" suffix indicates a higher carbon content (0.04–0.10%) for enhanced creep resistance at elevated temperatures.
Key Features
High-Temperature Performance:
Suitable for continuous service up to 800°C (1472°F).
Resists oxidation, scaling, and creep deformation under stress.
Stabilized with Titanium:
Prevents sensitization (chromium carbide formation) during welding or high-temperature exposure.
WN RTJ Design:
Weld Neck (WN): Tapered hub for stress distribution, ideal for high-pressure systems.
RTJ Face: Machined groove for metal ring gaskets (e.g., oval/octagonal), ensuring leak-proof seals in HPHT environments.
| Trade Name | Grade | UNS # | Flanges |
| 321 | F321 | S32100 | A182 / SA182 |
| 321H | F321H | S32109 | A182 / SA182 |
F321 vs. F321H: F321H has higher carbon for improved high-temperature strength.
ASTM A182 F321/F321H Flanges Specification
| Specification | ASTM A182 / A240 & ASME SA182 / SA240 |
| Grade | ASTM A182 F321 |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Size | 1/2″ to 48″ |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Type | SO, WN, LWN, BL, SW |
| Flange Face | FF, RF, RTJ |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Other materials | Stainless Steel Flange:F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F317L, F347, F347H, F904L etc Duplex Steel Flange: UNS S31803, 2205, S31254 (254SMO) Super Duplex Steel Flange: UNS S32750, UNS S32760, UNS S32304, S31500 Carbon Steel Flange: ASTM A105, A105N etc. Alloy Steel Flange: F1, F11, F22, F5, F9, F91 etc. Nickel Alloy Flange as below Monel 400 & K500, Inconel 600, 601, 617, 625, 690, 718, X-750. Incolloy 800, 800H, 800HT, 825, 925. Hastelloy C22, C4, C276, S, C2000, G-30, G-35, X, N, B, B-2, B-3. |
Applications
Oil & Gas: Wellhead equipment, pipelines, and refinery systems.
Power Plants: Steam lines, boilers, and turbine connections.
Chemical Processing: High-temperature reactors and heat exchangers.
Aerospace: Exhaust systems and combustion components.