Stainless steel 321 flanges are titanium-stabilized austenitic flanges, fabricated to ASTM A182 F321 standards, and are used in high-temperature welded assemblies where intergranular corrosion is a major issue. The titanium in UNS S32100, unlike standard SS 304 flanges, serves as a stabilizer of the carbide, and thus the chromium carbide is not formed at the weld areas; no post-weld heat treatment (PWHT) is necessary. At very high temperatures, above 538 °C (1000 °F), SS 321H flanges (UNS S32109) have better rupture strength due to creep, and so are used in aerospace exhaust stacks, heat exchangers and power generation systems.
These titanium-stabilized stainless steel flanges meet the ASME B16.5, DIN 1.4541 and WNR 1.4878 standards and come in sizes ranging from 1/2 to 48 in across the pressure classes 150 to 2500 pounds. The Aamardeep Steel provides SS 321 flanges worldwide, with ready stock, EN 10204 3.1 Mill Test Certificates and export shipments to various countries across the world.
What are Stainless steel 321 Flanges?
Stainless Steel 321 Flanges are pipe connection fittings that are made of a titanium stabilized austenitic stainless steel alloy. The purpose of these flanges is to be used for pipes and valves used under high temperatures. Titanium is added to avoid intergranular corrosion. These kinds of flanges are employed in different industries, such as the heat exchanger, chemical processing plants and aerospace applications.
Specification of Stainless Steel 321 Flanges
| Category | Specification Details |
|---|---|
| Material Specifications | ASTM A182 / ASME SA182 |
| Pressure Ratings (Class) | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Pressure Ratings (PN) | PN6, PN10, PN16, PN25, PN40, PN64, etc. |
| Size Range | 1/2″ (15 NB) to 48″ (1200 NB) |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 (Series A & B), B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Standard Flange Types | ANSI, ASME, BS, DIN, EN, etc. |
ASTM A182 Flanges Chemical Composition
| 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 | 17.0 – 19.0 | 0.10 max | 9.0 – 12.0 | 5(C+N) – 0.70 max |
SS 321 Flanges Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|---|
| 8.0 g/cm³ | 1457°C (2650°F) | 75,000 Psi (515 MPa) | 30,000 Psi (205 MPa) | 35% |
WNR 1.4878 Flanges Physical Properties
| Property | Density | Specific Heat | Modulus of Elasticity | Thermal Conductivity | Melting Range | Electrical Resistivity |
|---|---|---|---|---|---|---|
| Value (Imperial) | 0.286 lbs/in³ | 0.12 BTU/lb-°F | 28.0 × 10^6 psi | 9.3 BTU/hr·ft²/ft/°F | 2550–2635 °F | 72 Microhm-cm |
| Value (Metric) | 7.920 g/cm³ | 500 J/kg-K | 193 GPa | 16.0 W/m·K | 1398–1446 °C | 72 Microhm-cm |
Stainless Steel WNRF Flanges Equivalent Grades
| Grade | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
HSN Code of Stainless Steel 321 Flanges
| Properties | Values |
|---|---|
| HSN Code | 73072100 |
Types of Stainless Steel 321 Flanges
Stainless-Steel-321-Flanges-
SS 321H Spectacle Blind Flanges
INOX 321 Ring Type Joint Flange
SUS 321 Lap Joint Flanges
WNR 1.4541 Plate Flange
AISI 321 Orifice Flanges
Stainless Steel 321 Slip On Flange
UNS S32100 Weld Neck Flange
ASTM A182 F321 Socket Weld Flange
SS 321 Blind Flanges
ASTM A182 F321H Threaded Flange
Dimension Chart of ASTM A182 SS F321 Flanges
| NPS | OD (O) | Thk (Q) | RF Dia (R) | Hub Base (X) | WN Length (Y) | SORF/THD Length (Y) | Lap Joint Length (Y) | Bore (B) | Hub Bevel (H) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 3.50 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | 0.88 | 0.84 |
| 3/4″ | 3.88 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.11 | 1.05 |
| 1″ | 4.25 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.38 | 1.32 |
| 1-1/4″ | 4.62 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.72 | 1.66 |
| 1-1/2″ | 5.00 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.97 | 1.90 |
| 2″ | 6.00 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.46 | 2.38 |
| 2-1/2″ | 7.00 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.97 | 2.88 |
| 3″ | 7.50 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.60 | 3.50 |
| 3-1/2″ | 8.50 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.10 | 4.00 |
| 4″ | 9.00 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.60 | 4.50 |
| 5″ | 10.00 | 15/16 | 7-5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.69 | 5.56 |
| 6″ | 11.00 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.75 | 6.63 |
| 8″ | 13.50 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.75 | 8.63 |
| 10″ | 16.00 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.92 | 10.75 |
| 12″ | 19.00 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.92 | 12.75 |
| 14″ | 21.00 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 3-1/8 | 2-1/4 | 14.18 | 14.00 |
| 16″ | 23.50 | 1-7/16 | 18-1/2 | 18 | 5 | 3-7/16 | 2-1/2 | 16.19 | 16.00 |
| 18″ | 25.00 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 3-13/16 | 2-11/16 | 18.20 | 18.00 |
| 20″ | 27.50 | 1-11/16 | 23 | 22 | 5-11/16 | 4-1/16 | 2-7/8 | 20.25 | 20.00 |
| 24″ | 32.00 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 4-3/8 | 3-1/4 | 24.25 | 24.00 |
Stainless steel 321 Flanges Weight Chart
| NPS | Slip-On (SORF) | Threaded (NPT) | Socket Weld (SWRF) | Lap Joint | Blind (BLRF) | Weld Neck (WNRF) |
|---|---|---|---|---|---|---|
| 1/2″ | 1 | 1 | 2 | 1 | 2 | 2 |
| 3/4″ | 2 | 2 | 2 | 2 | 2 | 2 |
| 1″ | 2 | 2 | 2 | 2 | 2 | 3 |
| 1-1/4″ | 3 | 3 | 3 | 3 | 3 | 3 |
| 1-1/2″ | 3 | 3 | 3 | 3 | 4 | 4 |
| 2″ | 5 | 5 | 5 | 5 | 5 | 6 |
| 2-1/2″ | 8 | 8 | 8 | 8 | 7 | 10 |
| 3″ | 9 | 9 | 9 | 9 | 9 | 11.5 |
| 3-1/2″ | 11 | 12 | 11 | 11 | 13 | 12 |
| 4″ | 13 | 13 | 13 | 13 | 17 | 16.5 |
| 5″ | 15 | 15 | 15 | 15 | 20 | 21 |
| 6″ | 19 | 19 | 19 | 19 | 27 | 26 |
| 8″ | 30 | 30 | 30 | 30 | 47 | 42 |
| 10″ | 43 | 43 | 43 | 43 | 70 | 54 |
| 12″ | 64 | 64 | 64 | 64 | 123 | 88 |
| 14″ | 90 | 90 | 90 | 105 | 140 | 114 |
| 16″ | 106 | 98 | 98 | 140 | 180 | 140 |
| 18″ | 130 | 130 | 130 | 160 | 220 | 165 |
| 20″ | 165 | 165 | 165 | 195 | 285 | 197 |
| 22″ | 185 | 185 | 185 | 245 | 355 | 225 |
| 24″ | 220 | 220 | 220 | 275 | 430 | 268 |
SS 321 Flange UNS S32100 (ASME B16.5 Class 150) Thickness Chart
| Pipe Size (NPS) | DN | O.D. (O) | Thk (C) | Hub Dia (X) | RF Dia (G) | Hub Len (Y) | Bolt Circle (BC) | Hole Dia (BH) | Bolt Qty | Bolt Size | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 89.0 | 11.2 | 30.2 | 35.1 | 15.7 | 60.5 | 15.8 | 4 | 1/2″ | 0.4 |
| 3/4″ | 20 | 98.5 | 12.7 | 38.1 | 42.9 | 15.7 | 69.9 | 15.8 | 4 | 1/2″ | 0.7 |
| 1″ | 25 | 108.0 | 14.2 | 49.3 | 50.8 | 17.5 | 79.3 | 15.8 | 4 | 1/2″ | 0.8 |
| 1-1/4″ | 32 | 117.5 | 15.7 | 58.7 | 63.5 | 20.6 | 88.9 | 15.8 | 4 | 1/2″ | 1.2 |
| 1-1/2″ | 40 | 127.0 | 17.5 | 65.0 | 73.2 | 22.4 | 98.6 | 15.8 | 4 | 1/2″ | 1.5 |
| 2″ | 50 | 152.5 | 19.1 | 77.7 | 91.9 | 25.4 | 120.7 | 19.1 | 4 | 5/8″ | 2.3 |
| 2-1/2″ | 65 | 178.0 | 22.4 | 90.4 | 104.6 | 28.4 | 139.7 | 19.1 | 4 | 5/8″ | 3.7 |
| 3″ | 80 | 190.5 | 23.9 | 108.0 | 127.0 | 30.2 | 152.4 | 19.1 | 4 | 5/8″ | 4.1 |
| 3-1/2″ | 90 | 216.0 | 23.9 | 122.2 | 139.7 | 31.8 | 177.8 | 19.1 | 8 | 5/8″ | 5.1 |
| 4″ | 100 | 228.5 | 23.9 | 134.9 | 157.2 | 33.3 | 190.5 | 19.1 | 8 | 5/8″ | 5.9 |
| 5″ | 125 | 254.0 | 23.9 | 163.6 | 185.7 | 36.6 | 215.9 | 22.4 | 8 | 3/4″ | 7.0 |
| 6″ | 150 | 279.5 | 25.4 | 192.0 | 215.9 | 39.6 | 241.3 | 22.4 | 8 | 3/4″ | 8.4 |
| 8″ | 200 | 343.0 | 28.4 | 246.1 | 269.7 | 44.5 | 298.5 | 22.4 | 8 | 3/4″ | 13.0 |
| 10″ | 250 | 406.5 | 30.2 | 304.8 | 323.9 | 49.3 | 362.0 | 25.4 | 12 | 7/8″ | 18.0 |
| 12″ | 300 | 482.5 | 31.8 | 365.3 | 381.0 | 55.6 | 431.8 | 25.4 | 12 | 7/8″ | 29.0 |
| 14″ | 350 | 533.5 | 35.1 | 400.1 | 412.8 | 57.2 | 476.3 | 28.5 | 12 | 1″ | 39.0 |
| 16″ | 400 | 597.0 | 36.6 | 457.2 | 469.9 | 63.5 | 539.8 | 28.5 | 16 | 1″ | 47.0 |
| 18″ | 450 | 635.0 | 39.6 | 505.0 | 533.4 | 68.3 | 577.9 | 31.8 | 16 | 1 1/8″ | 57.0 |
| 20″ | 500 | 698.5 | 42.9 | 558.8 | 584.2 | 73.2 | 635.0 | 31.8 | 20 | 1 1/8″ | 76.0 |
| 24″ | 600 | 813.0 | 47.8 | 663.4 | 692.2 | 82.6 | 749.3 | 35.1 | 20 | 1 1/4″ | 97.0 |
ANSI/ASME B16.34 Pressure Rating Chart
| Temperature (°F) | 150# | 300# | 400# | 600# | 900# | 1500# | 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 |
ASTM A182 Grade F321 Flange Price List
| Flange Description | Price in India (INR) | Price in UAE (AED) |
|---|---|---|
| SS ASTM A182 F321 Blind Flanges | ₹1,272.15 / Piece | 66.11 AED |
| 321 Stainless Steel Flanges (General) | ₹1,766.88 / Piece | 91.82 AED |
| ASTM A182 Gr F321 Flanges | ₹1,554.85 / Piece | 80.80 AED |
| ASTM A182 Gr F321H Flanges (Mumbai) | ₹989.45 / Piece | 51.42 AED |
| ASTM A182 321 SS Flanges (Mumbai) | ₹1,342.83 / Piece | 69.78 AED |
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Frequently Asked Questions
What is Stainless Steel 321 flange?
A Stainless Steel 321 flange is a titanium-stabilized austenitic stainless steel pipe fitting used to connect pipes and equipment, offering excellent resistance to high temperatures and intergranular corrosion.
What is ASTM A182 F321 flange specification?
ASTM A182 F321 is a standard specification for forged stainless steel flanges made from SS 321, designed for high-temperature and corrosion-resistant applications.
What is the difference between 321 and 321H flanges?
The main difference is carbon content — 321H has higher carbon content than 321, which improves high-temperature strength, while 321 offers better resistance to corrosion after welding.
What are the applications of SS 321 flanges?
SS 321 flanges are used in aerospace, heat exchangers, exhaust systems, chemical processing, and power generation industries due to their high-temperature resistance.
What is the temperature range of SS 321 flanges?
SS 321 flanges can typically withstand temperatures up to around 870°C in continuous service and up to 925°C in intermittent conditions.
