ASTM A182 F321 Flanges | ASME B16.5 Manufacturer & Supplier
We are a professional manufacturer and exporter of ASTM A182 F321 stainless steel flanges, designed and produced according to ASME B16.5 and B16.47 standards.
A182 Grade F321 is a stabilized austenitic stainless steel containing titanium, offering excellent resistance to intergranular corrosion and high-temperature oxidation.
Our F321 flanges are ideal for use in heat exchangers, refineries, power plants, and chemical process piping systems.
Available Types of ASTM A182 F321 Flanges
- ASTM A182 F321 Weld Neck Flange (WN)
- ASTM A182 F321 Slip On Flange (SO)
- ASTM A182 F321 Socket Weld Flange (SW)
- ASTM A182 F321 Blind Flange (BL)
- Lap Joint Flange (LJ)
- Threaded Flange (TH)
- Long Weld Neck (LWN)
- Plate Flange / Flat Face Flange
Size Range: ½” to 48” (DN15–DN1200)
Pressure Rating: Class 150 to 2500
Standard: ASME B16.5 / ASME B16.47 / EN 1092-1 / MSS SP-44
Chemical Composition (ASTM A182 F321)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C% – ≤ 0.70 |
The Titanium addition in 321 prevents carbide precipitation during welding or high-temperature exposure, maintaining excellent corrosion resistance.
Mechanical Properties of ASTM A182 F321
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (HB) | ≤ 217 |
Difference between A182 F321 and ASTM F321H
Both A182 F321 and A182 F321H are titanium-stabilized austenitic stainless steels based on Type 304 stainless steel, but stabilized with titanium (Ti) to prevent carbide precipitation during welding and high-temperature exposure.
The main difference lies in their carbon content and intended service temperature.
The “H” in F321H stands for High Carbon, meaning it contains more carbon (0.04–0.10%) than F321 (max 0.08%).
F321H performs better under high temperature and high stress (creep) conditions — making it preferred for pressure vessels, heaters, and reformer tubes.
ASTM A182 F321 Flanges Manufacturing & Testing
All flanges are forged, heat-treated, and machined in-house to ensure high dimensional accuracy and performance.
Testing includes:
- Visual & dimensional inspection
- PMI (Positive Material Identification)
- UT / RT / PT / MT NDT tests
- Hydrostatic testing on request
- Surface finish: Pickled, polished, or machined
ASTM A182 F321 Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32100 |
| EN | 1.4541 |
| JIS | SUS 321 |
| DIN | X6CrNiTi18-10 |
Applications of ASTM A182 F321 Flanges
- Chemical process and petrochemical industries
- Heat exchangers and boiler piping
- Power generation systems
- Aerospace exhaust and manifolds
- Oil & gas refineries
Download ASTM A182 F321 Specification
Order Example – ASTM A182 F321 Stainless Steel Flanges
| Item No. | Description | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | ASTM A182 F321 Weld Neck Flange, Class 150, Size: 6” (DN150), Raised Face (RF), ASME B16.5, ANSI Standard | 40 | Pieces | EN 10204 3.1 Certificate |
| 2 | ASTM A182 F321 Slip On Flange, Class 300, Size: 4” (DN100), Raised Face | 60 | Pieces | For refinery pipeline project |
| 3 | ASTM A182 F321 Blind Flange, Class 600, Size: 8” (DN200), Raised Face | 25 | Pieces | With full traceability (Heat No. marking) |
| 4 | ASTM A182 F321 Socket Weld Flange, Class 150, Size: 2” (DN50), Raised Face |
Related Products
- ASTM A182 F321H Flanges
- ASTM A240 TP321 Plates & Sheets
- ASME SA213 TP321 Seamless Tubes
- ASTM A276 321 Round Bars
- ASME B16.47 Series A/B Flanges
