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Solitaire Overseas produces Stainless Steel 321 Flanges as per ASTM A182 F321 and supply the clients from our Mumbai factory to various industries like Oil & Gas, Aerospace, Power generation etc. Available in ASME B16.5 / B16.47 dimensions, Class 150-2500, with PMI and mill test report standard on each order, all flanges are titanium-stabilized (Ti ≥ 5×[C+N]) to prevent carbide precipitation at weld heat-affected zones, providing reliable intergranular corrosion resistance with continuous high-temperature use up to 900℃. They are also have very good oxidation resistance and high mechanical strength at high temperatures. Available in different types, sizes, with pressure classes. Stainless Steel 321 Flanges can be utilized in different pipe and equipment fittings. Their ability to resist corrosion, being weldable and stable at high temperatures makes them suitable material for use in difficult conditions. Solitaire Overseas Flange is manufactured with high precision and strict quality control to ensure accuracy and reliability of its functioning.
Get a Free Quote for Stainless Steel 321 Flanges →| Specification Parameter | Details / Available Options |
|---|---|
| ASME / ANSI Standards | ASME B16.5, ASME B16.36, ASME B16.47, ASME B16.48 |
| Size Range | Standard: DN15 to DN1500 (NPS 1/2 " to 24") Large Diameter: 26" to 60" (Contact manufacturer for sizes above 48") |
| Pressure Ratings | PN Rating: PN2.5 to PN400 Class / PSI Rating: 150 PSI, 300 PSI, 600 PSI, 900 PSI, 1500 PSI, 2500 PSI |
| Wall Thickness / Schedule | SCH 10, SCH 20, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 180 |
| Manufacturing Process | Forged, Plate, Cast |
| Number of Bolt Holes | 4 to 48 holes |
| Flange Face Types | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Male & Female (M&F), Tongue & Groove (T&G) |
| Surface Finish | Stock & Smooth, Concentric Serrated, Spiral Serrated, Cold Water Finish, Mirror Finish |
| Connection Types | Welding, Threaded |
| Thread Profiles | NPT, MNPT, FPT, MPT, BSP, BSPT |
| Working Temperature | Up to approximately 900°C (1652°F) |
| Key Advantages | Excellent heat resistance, optimal for high-temperature environments |
| Applicable Fluids | Oil and Gas, Steam, Water & Air |
| Primary Industry Uses | Oil & gas plants, Petrochemicals, Power Generation, Nuclear Energy |
| Testing & Quality Control | PMI (Positive Material Identification) test, Tensile test, Hardness test, Impact test, Material inspection |
| Available Documentation | Raw material test reports, Material traceability records, Fumigation certificates |
| Standard Marking Info | Manufacturers Name, Standard & Heat No., Grade & Material, Size & Schedule |
| Value Added Services | Threading, Beveling end, Polishing, Minor Fabrication, Casting |
| Estimated Lifespan | Stainless Steel = 50 to 55 years |
| Logistics Modes | By Sea, By Air |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Grade | Density | Melting Point | Tensile Strength (Min) | Yield Strength (0.2% Offset Min) | Elongation (Min) |
|---|---|---|---|---|---|
| SS 321 | 8.0 g/cm³ | 1457°C (2650°F) | 515 MPa (75,000 psi) | 205 MPa (30,000 psi) | 35% |
| Temperature (°F) | Class 150 | Class 300 | Class 400 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|---|
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 650 | 125 | 430 | 575 | 860 | 1290 | 2150 | 3580 |
| 700 | 110 | 425 | 565 | 850 | 1275 | 2125 | 3540 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 800 | 80 | 405 | 540 | 805 | 1210 | 2015 | 3360 |
| 850 | 65 | 395 | 530 | 790 | 1190 | 1980 | 3300 |
| 900 | 50 | 390 | 520 | 780 | 1165 | 1945 | 3240 |
| 950 | 35 | 380 | 510 | 765 | 1145 | 1910 | 3180 |
| 1000 | 20 | 320 | 430 | 640 | 965 | 1605 | 2675 |
| 1050 | 20 | 310 | 410 | 615 | 925 | 1545 | 2570 |
| 1100 | 20 | 255 | 345 | 515 | 770 | 1285 | 2145 |
| 1150 | 20 | 200 | 265 | 400 | 595 | 995 | 1655 |
| 1200 | 20 | 155 | 205 | 310 | 465 | 770 | 1285 |
| 1250 | 20 | 115 | 150 | 225 | 340 | 565 | 945 |
| 1300 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
| 1350 | 20 | 60 | 80 | 125 | 185 | 310 | 515 |
| 1400 | 20 | 50 | 65 | 95 | 145 | 240 | 400 |
| 1450 | 15 | 35 | 45 | 70 | 105 | 170 | 285 |
| 1500 | 10 | 25 | 35 | 55 | 80 | 135 | 230 |
| NPS (in) | Outside Diam. (O) | Thk. Min (Q) | Diam. Raised Face (R) | Hub Diam. Base (X) | Length Thru Hub WN (Y) | Length Thru Hub SO/Thd (Y) | Length Thru Hub LJ (Y) | Bore Slip-On (B) | Bore Lap Joint (H) | Hub Diam. Bevel (W) | Fillet Radius (r) | Socket Depth (Z) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | 0.88 | 0.90 | 0.84 | 1/8 | 3/8 |
| 3/4" | 3-7/8 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.09 | 1.11 | 1.05 | 1/8 | 7/16 |
| 1" | 4-1/4 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.36 | 1.38 | 1.32 | 1/8 | 1/2 |
| 1-1/4" | 4-5/8 | 5/8 | 2-1/2 | 2-3/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 3/16 | 9/16 |
| 1-1/2" | 5 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.95 | 1.97 | 1.90 | 1/4 | 5/8 |
| 2" | 6 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.44 | 2.46 | 2.38 | 5/16 | 11/16 |
| 2-1/2" | 7 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.94 | 2.97 | 2.88 | 5/16 | 3/4 |
| 3" | 7-1/2 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.57 | 3.60 | 3.50 | 3/8 | 13/16 |
| 3-1/2" | 8-1/2 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.07 | 4.10 | 4.00 | 3/8 | 7/8 |
| 4" | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-3/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 7/16 | 15/16 |
| 5" | 10 | 15/16 | 7-5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.66 | 5.69 | 5.56 | 7/16 | 15/16 |
| 6" | 11 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.72 | 6.75 | 6.63 | 1/2 | 1-1/16 |
| 8" | 13-1/2 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.72 | 8.75 | 8.63 | 1/2 | 1-1/4 |
| 10" | 16 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.88 | 10.92 | 10.75 | 1/2 | 1-5/16 |
| 12" | 19 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.88 | 12.92 | 12.75 | 1/2 | 1-9/16 |
| 14" | 21 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 2-1/4 | 3-1/8 | 14.14 | 14.18 | 14.00 | 1/2 | 1-5/8 |
| 16" | 23-1/2 | 1-7/16 | 18-1/2 | 18 | 5 | 2-1/2 | 3-7/16 | 16.16 | 16.19 | 16.00 | 1/2 | 1-3/4 |
| 18" | 25 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 2-11/16 | 3-13/16 | 18.18 | 18.20 | 18.00 | 1/2 | 1-15/16 |
| 20" | 27-1/2 | 1-11/16 | 23 | 22 | 5-11/16 | 2-7/8 | 4-1/16 | 20.20 | 20.25 | 20.00 | 1/2 | 2-1/8 |
| 24" | 32 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 3-1/4 | 4-3/8 | 24.25 | 24.25 | 24.00 | 1/2 | 2-1/2 |
| Nominal Pipe Size | Outside Diam. of Flange (O) | Min Thk. of Flange (C) | Diam. of Hub (X) | Diam. of Raised Face (G) | Length Thru Hub (Y) | Min Thread Length (T) | Bolt Circle Diam. (BC) | Bolt Hole Diam. (BH) | Number of Bolts (BN) | Bolt Diam. (BD) | Approx. Weight (KG) | Approx. Weight (LB) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 89.00 | 11.20 | 30.20 | 35.10 | 15.70 | 15.70 | 60.50 | 15.80 | 4 | 1/2" | 0.4 | 0.9 |
| 3/4" | 98.50 | 12.70 | 38.10 | 42.90 | 15.70 | 15.70 | 69.90 | 15.80 | 4 | 1/2" | 0.7 | 1.5 |
| 1" | 108.00 | 14.20 | 49.30 | 50.80 | 17.50 | 17.50 | 79.30 | 15.80 | 4 | 1/2" | 0.8 | 1.8 |
| 1-1/4" | 117.50 | 15.70 | 58.70 | 63.50 | 20.60 | 20.60 | 88.90 | 15.80 | 4 | 1/2" | 1.2 | 2.6 |
| 1-1/2" | 127.00 | 17.50 | 65.00 | 73.20 | 22.40 | 22.40 | 98.60 | 15.80 | 4 | 1/2" | 1.5 | 3.3 |
| 2" | 152.50 | 19.10 | 77.70 | 91.90 | 25.40 | 25.40 | 120.70 | 19.10 | 4 | 5/8" | 2.3 | 5.1 |
| 2-1/2" | 178.00 | 22.40 | 90.40 | 104.60 | 28.40 | 28.40 | 139.70 | 19.10 | 4 | 5/8" | 3.7 | 8.1 |
| 3" | 190.50 | 23.90 | 108.00 | 127.00 | 30.20 | 30.20 | 152.40 | 19.10 | 4 | 5/8" | 4.1 | 9.0 |
| 3-1/2" | 216.00 | 23.90 | 122.20 | 139.70 | 31.80 | 31.80 | 177.80 | 19.10 | 8 | 5/8" | 5.1 | 11.2 |
| 4" | 228.50 | 23.90 | 134.90 | 157.20 | 33.30 | 33.30 | 190.50 | 19.10 | 8 | 5/8" | 5.9 | 13.0 |
| 5" | 254.00 | 23.90 | 163.60 | 185.70 | 36.60 | 36.60 | 215.90 | 22.40 | 8 | 3/4" | 7.0 | 15.4 |
| 6" | 279.50 | 25.40 | 192.00 | 215.90 | 39.60 | 39.60 | 241.30 | 22.40 | 8 | 3/4" | 8.4 | 18.5 |
| 8" | 343.00 | 28.40 | 246.10 | 269.70 | 44.50 | 44.50 | 298.50 | 22.40 | 8 | 3/4" | 13.0 | 28.6 |
| 10" | 406.50 | 30.20 | 304.80 | 323.90 | 49.30 | 49.30 | 362.00 | 25.40 | 12 | 7/8" | 18.0 | 39.5 |
| 12" | 482.50 | 31.80 | 365.30 | 381.00 | 55.60 | 55.60 | 431.80 | 25.40 | 12 | 7/8" | 29.0 | 64.0 |
| 14" | 533.50 | 35.10 | 400.10 | 412.80 | 57.20 | 57.20 | 476.30 | 28.50 | 12 | 1" | 39.0 | 86.0 |
| 16" | 597.00 | 36.60 | 457.20 | 469.90 | 63.50 | 63.50 | 539.80 | 28.50 | 16 | 1" | 47.0 | 103.0 |
| 18" | 635.00 | 39.60 | 505.00 | 533.40 | 68.30 | 68.30 | 577.90 | 31.80 | 16 | 1 1/8" | 57.0 | 126.0 |
| 20" | 698.50 | 42.90 | 558.80 | 584.20 | 73.20 | 73.20 | 635.00 | 31.80 | 20 | 1 1/8" | 76.0 | 167.0 |
| 24" | 813.00 | 47.80 | 663.40 | 692.20 | 82.60 | 82.60 | 749.30 | 35.10 | 20 | 1 1/4" | 97.0 | 214.0 |
Stainless Steel 321 Flanges are titanium-stabilized stainless steel flanges used to connect piping systems while providing excellent resistance to heat and corrosion.
The UNS designation for Stainless Steel 321 Flanges is UNS S32100.
SS 321H contains a higher carbon content than SS 321, providing improved strength and creep resistance at elevated temperatures.
The Werkstoff number for Stainless Steel 321 Flanges is 1.4541.
Titanium stabilization means titanium is added to the alloy to prevent chromium carbide formation, improving resistance to intergranular corrosion after welding.