Stainless Steel 321 Flanges Manufacturer in India
SS 321 stainless steel is a titanium-stabilized austenitic grade of stainless steel invented to perform better in the area of high temperature and corrosive applications. Titanium stabilization helps to avoid carbide forming and precipitation in the process of welding as well as during high temperature service whereas the base alloy composition offers high resistance to oxidation, corrosion and chemical attack. SS 321 Flanges are highly applied in piping systems that have to be very thermally stable, robust, resistant to corrosion, and also with extended service duration. The flanges have a good performance in high pressure, high temperature and chemically aggressive environments and provide good structural integrity, stable and leak free connections that are used in chemical processing, petrochemical plants, refineries, power generation units, aerospace systems, exhaust systems, offshore installations and other hostile industrial environments.
Table of Contents
- What Are SS 321 Flanges?
- Specification of Stainless Steel 321 Flanges
- Chemical Composition of SS 321 Flange
- Mechanical Composition of SS 321 Flanges
- Equivalent Grades of SS Grade F321 WNRF Flanges
- Size chart of Stainless Steel F321 Forged Flange
- Thickness Chart of SS UNS S32100 Flanges
- Pressure rating table of SS DIN 1.4541 Spectacle Flanges
- Different Types of Stainless Steel 321 Flanges
- Application and Industrial Usage of SS 321 Flanges
- Price Chart of SS 321 Flanges
- Frequently Asked Questions (FAQ)
What Are SS 321 Flanges?
SS 321 flanges are produced based on the ASTM A182 F321 and are made of forged and rolled stainless steel in order to make high-performance piping systems. Titanium is used in this grade as a stabilizing element, and enhances the resistance of intergranular corrosion and inhibits the formation of carbides during welding and service at long-term high-temperature. The flanges S 321 are specially adjusted to systems that are subjected to high heat, pressure and severe industrial media. They are used widely in chemical plants, refineries, petrochemical units, heat exchangers, power plants, aerospace and exhaust systems, offshore platforms and other critical industries in which thermal stability, corrosion resistance and long-term durability are vital.
Specification of Stainless Steel 321 Flanges
| Feature | Details |
| Specifications List | ASTM A182 / ASME SA182 |
| Class / Pressure Rating | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Size Chart | 1/2? (15 NB) to 48? (1200NB) |
| ASTM Standards | ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc. |
| Standard Flange | ANSI, ASME, BS, DIN, EN etc. |
Chemical Composition of SS 321 Flange
The chemical composition of SS 321 flanges is provided in the following table.
| 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 |
Mechanical Composition of SS 321 Flanges
The mechanical properties help you to understand the different factors while buying SS 321 flanges for your requirements. So the detailed information on its mechanical properties is given below.
| Property | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Value | 8.0 g/cm- | 1457 -C (2650 -F) | 515 MPa (75,000 Psi) | 205 MPa (30,000 Psi) | 35 % |
Equivalent Grades of SS Grade F321 WNRF Flanges
The equivalent grades of the SS 321 Flanges are given below.
| Standard | Werkstoff Nr. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
Size chart of Stainless Steel F321 Forged Flange(mm)
The stainless steel 321 flanges come in different size that information is given below.
| NPS | O | Q | R | X | Y (WN) | Y (S/T) | Y (LJ) | W | B (S/S) | B (LJ) | H | r | Z |
| 1/2 | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | .88 | .89 | 0.84 | 0.62 | 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 | 0.82 | 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 | 1.05 | 1/8 | 1/2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 1.38 | 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 | 1.61 | 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 | 2.07 | 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 | 2.47 | 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 | 3.07 | 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 | 3.55 | 3/8 | 7/8 |
| 4 | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 4.03 | 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 | 5.05 | 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 | 6.07 | 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 | 7.98 | 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 | 10.02 | 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 | 12.00 | 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 | 13.25 | 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 | 15.25 | 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 | 17.25 | 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 | 19.25 | 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 | 23.25 | 1/2 | 2-1/2 |
Thickness Chart of SS UNS S32100 Flanges
The thickness chart of the material helps to find out the suitable material according to your needs.
| Pipe Nom. Diam. (dn) | O.D. Flange (O) | Thk. Min (C) | Diam. Hub (X) | Diam. Raised Face (G) | Length Hub (Y) | Thread Length (T) | Bolt Circle (BC) | Bolt Hole (BH) | No. Bolts (N) | Bolt Diam. (BD) | Weight (KG) | 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 |
Pressure rating table of SS DIN 1.4541 Spectacle Flanges
The detailed pressure rating of the SS 321 Flanges is listed below.
| 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 |
Different Types of Stainless Steel 321 Flanges
Threaded Stainless Steel Flange
stainless steel ss 321 pipe flange
Stainless Steel 1.4541 Flange
JIS SUS 321 Reducing Weld Neck Flange
Flanges Stainless Steel ANSI 321
astm a182 300 f321 stainless steel forged ff plate flat flange
ASME B16.47 A182 F321stainless steel backing ringflange
ANSI B16.5 Standard StainlessSteel 321 Forged Pipe FlangesFrom Class 150 to 2500
aisi 321 RL RF Forged StainlessSteel Plate Flanges
321 Stainless steel flange, socketweld Flanges
321 ss Reducing Weld NeckFlange
321 Forged Stainless SteelFlange
Application and Industrial Usage of SS 321 Flanges
SS 321 flanges are an important element of industrial piping systems where thermal stability, high-temperature resistance, and corrosion protection are vital. Their application is prevalent in chemical processing plants, petrochemical plants, refineries, power generation units and heat exchanger systems where the system is subjected to constant heat, pressure and harsh operating conditions. They are widely used too in exhaust systems, aerospace, offshore platforms, pharmaceutical plants, heavy industry processing lines, etc., which need oxidation/thermal/long-term material resistance. Moreover, SS 321 flanges are significant in high temperature piping networks, industrial fabrication systems and critical infrastructure projects so they are generally needed in an environment where their durability, performance, and operational safety may be of a priority.
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Price Chart of SS 321 Flanges
The price of the stainless steel flanges depends on many factors, including the estimated price of this material, which is given below.
| Product Description | Price in India (INR) | Price in UAE (AED) |
| SS 321 Blind Flanges | Rs. 1,272.15 | AED 66.11 |
| 321 Stainless Steel Flanges | Rs. 1,766.88 | AED 91.82 |
| ASTM A182 Gr F321 Flanges | Rs. 1,554.85 | AED 80.80 |
| ASTM A182 Gr F321H Flanges (Mumbai) | Rs. 989.45 | AED 51.42 |
| ASTM A182 321 SS Flanges (Mumbai) | Rs. 1,342.83 | AED 69.78 |
Frequently Asked Questions (FAQ)
The 321 flanges are pipe connectors made from stainless steel 321, a titanium-stabilized steel designed for high-temperature and corrosion-resistant applications.
The titanium content prevents carbide formation at high temperatures, helping the material maintain strength and corrosion resistance.
SS 321 flanges handle high temperatures better because of titanium stabilization, while SS 304 and SS 316 are mainly focused on general corrosion resistance.
They are commonly used in petrochemical, chemical processing, power generation, aerospace, refineries, and high-temperature industrial systems.
Yes, SS 321 flanges are well-suited for petrochemical and refinery applications due to their heat resistance, strength, and corrosion protection.
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