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321 Stainless Steel Flanges

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Check Dimension of ASTM A182 Gr F321h BLRF Flange, Manufacturer of SS 321 SORF Flange

Alloy 321 is an austenitic low carbon grade steel. The 321 Stainless Steel Flanges are made from chromium and nickel along with a few trace elements, which are stabilized by titanium. These flanges are highly resistant to corrosion and extreme temperatures. Along with this, they have high tensile strength, yield strength, and strength to rupture. They are commonly seen in oil and gas pipelines, chemical industries, plumbing, furnaces, heat exchangers, etc. We are one of the top Stainless Steel 321 Steel Flange manufacturers in India who focus on creating high-quality products at the most reasonable prices.

321 Stainless Steel Flanges
321 Stainless Steel Flanges
ASTM A182 Gr F321h BLRF Flange
ASTM A182 Gr F321h BLRF Flange
SS 321 SORF Flange
SS 321 SORF Flange

High Pressure ASME B16.5 UNS S32100 WNRF Flange Supplier, Check Weight Chart of A182 Gr F321h Forged Flanges

The ASTM A182 Gr F321h BLRF Flange is designed by using a rolling plate and welding the seam. This flange doesn’t have a hub but has bolt holes enabling it to seal the end of pipes and valves. The SS 321 SORF Flange is a flange dropped onto the end of the pipe and welded. This flange is quite cheap and durable. All our products are manufactured using the best raw materials and the latest technology.

The ASME B16.5 UNS S32100 WNRF Flange is a heavy-duty flange and is used in high-pressure applications. This flange has a long tapered hub, which provides support to the pipe or valve. While the A182 Gr F321h Forged Flanges combines separate machinery, parts to support them. Unlike the above two flanges, the ASTM A182 F 321 Threaded Flanges can be attached to piping systems without welding. This has a threaded bore that matches the external thread of a pipe. If you want to know more about these fittings or customized them in different sizes or dimensions, contact us.

Table of Contents


321 Stainless Steel Flanges Spec Chart

Size Chart 1/2" (15 NB) to 48" (1200NB) DN10~DN5000
JIS 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
UNI 6Bar 10Bar 16Bar 25Bar 40Bar
EN 6Bar 10Bar 16Bar 25Bar 40Bar
Pressure Rating ANSI 600 LBS, 900 LBS, 150 LBS, 2500 LBS, 300 LBS, 1500 LBS
Pressure Calculation in DIN 16Bar 6Bar 25Bar 40Bar 10Bar / PN10 PN16 PN6 PN25 PN64 PN40
Production technique Forged, Heat treated and machined
Connect Type/ Flange Face Type Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Raised Face (RF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Coating Anti-rust Paint, Zinc Plated,Oil Black Paint, Cold and Hot Dip Galvanized, Yellow Transparent
Most common types Forged / Threaded / Screwed / Plate
Uses & application
  • Nuclear power (mostly seamless).
  • Bitumen upgraders.
  • Petrochemicals and acids.
  • Heavy oil refineries.
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Export to Spain, Canada, Singapore, Indonesia, Ukraine, Ireland, Brazil, Korea, Iran, India, Saudi Arabia, Thailand, Egypt, Oman, Dubai, USA, Peru, etc
Test Hydrostatic testing machine, X-ray detector, Direct-reading Spectrograph, UI trasonic flaw detector, Magnetic particle detector
Equipment Bending machine, Pushing Machine,Press machine, electric bevelling machine, Sand-blasting machine etc
Origin Indian / West Europe / Japan / USA / Korean
Standards API7S-15, API7S-43, API605, ANSI/ASME B16.5, B16.47 Series A & B, B16.48, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, EN1092
Manufacturer of

ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange

  • B.S: BS4504 , BS3293, BS1560, BS10
  • German (DIN)
  • AS 2129: Table D; Table E; Table H
  • ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
  • ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48
  • American standard (ANSI)
  • British standard (BS)
  • ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638
  • The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
Special design

As per your drawing

AS, ANSI, BS, DIN and JIS
15 NB (1/2") to 200 NB (8")
Equal and Reducing Configurations

View Prices of ASTM A182 Gr F321 / 321H Flanges

Price list of Stainless Steel 321 Flanges ASTM A182 Gr F321 / 321H Flange Price in INR ASTM A182 Gr F321 / 321H Flange Price in USD ASTM A182 Gr F321 / 321H Flange Price in UAE Dirham
ASME SA182 F321 Blind Flange 1/2″ NB 34509.3 $497.5 UAE Dirham 1827.3

Dimension Table of ANSI B16.5 SS F321 Forged Flanges

Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS4087 PN14 95 67 4 M12 14
AS 2129 Flange Table C 95 67 4 13 14
Table D 95 67 4 13 14
Table E 95 67 4 13 14
Table F 95 67 4 13 14
Table H 114 83 4 16 17
Table J 114 83 4 16 17
ANSI B16.5 ANSI 150 89 60 4 13 16
ANSI 300 95 67 4 13 16
ANSI 600 95 67 4 13 16
ANSI 900 121 83 4 19 22
ANSI 1500 121 83 4 19 22
ISO 7005 (DIN) Flange PN6 80 55 4 M10 11
PN10 95 65 4 M12 14
PN16 95 65 4 M12 14
PN20 90 60.5 4 M14 16
PN25 95 65 4 M12 14
PN40 95 65 4 M12 14

Purchase 321H SS Blind Flange at factory price, Held wide stock of Stainless Steel 321 Slip On Flanges

321 SS Flange Pressure Rating Chart

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

Weight Chart of Stainless Steel 321 Flange

CLASS Nominal Pipe Size Slip On Flange Threaded Flange Socket Weld Flange Lap Joint Flange Blind Flange Weld Neck Flange
150 lb ½ 1 1 2 1 2 2
¾ 2 2 2 2 2 2
1 2 2 2 2 2 3
1¼ 3 3 3 3 3 3
1½ 3 3 3 3 4 4
2 5 5 5 5 5 6
2½ 8 8 8 8 7 10
3 9 9 9 9 9 11.5
3½ 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
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
300 lb ½ 2 2 3 2 2 2
¾ 3 3 3 3 3 3
1 3 3 3 3 4 4
1¼ 4.5 4.5 4 4.5 6 5
1½ 6.5 6.5 6 6.5 7 7
2 7 7 7 7 8 9
2½ 10 10 10 10 12 12
3 13 14 13 14.5 16 18
3½ 17 17 17 17 21 20
4 23.5 24 22 24 28 26.5
5 29 31 28 28 37 36
6 39 39 39 39 50 45
8 58 58 58 58 81 69
10 81 81 81 91 124 100
12 115 115 115 140 185 142
14 165 165 165 190 250 206
16 210 220 190 234 315 250
18 253 280 250 305 414 320
20 315 325 315 375 515 400
22 370 370 370 435 640 465
24 490 490 475 550 800 580
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
400 lb ½ 2 2 2 2 2 3
¾ 3 3 3 3 3 3.5
1 3.5 3.5 3.5 3.5 4 4
1¼ 4.5 4.5 4.5 4.5 6 4.5
1½ 6.5 6.5 6.5 6.5 8 8
2 8 8 8 8 10 10
2½ 12 12 12 11 15 14
3 15 15 15 14 20 18
3½ 21 21 21 20 29 26
4 26 26 26 25 33 35
5 31 31 31 29 44 43
6 44 44 44 42 61 57
8 67 67 67 64 100 89
10 91 91 91 110 155 125
12 130 130 130 152 226 175
14 191 191 191 210 310 233
16 253 253 253 280 398 295
18 310 310 310 345 502 360
20 378 378 378 420 621 445
22 405 405 405 455 720 505
24 539 539 539 615 936 640
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
600 lb ½ 2 2 2 2 3 3
¾ 3 3 3 3 4 4
1 4 4 4 4 4 4
1¼ 5 5 5 5 6 6
1½ 7 7 7 7 8 8
2 9 9 9 9 10 12
2½ 13 13 13 12 15 18
3 16 16 16 15 20 23
3½ 21 21 21 20 29 26
4 37 37 37 36 41 42
5 63 63 63 63 68 68
6 80 80 80 78 86 81
8 115 15 15 112 140 120
10 177 177 177 195 231 190
12 215 215 215 240 295 226
14 259 259 259 290 378 347
16 366 366 366 400 527 481
18 476 476 476 469 665 555
20 612 612 612 604 855 690
22 590 590 590 670 1000 720
24 876 876 876 866 1250 977
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
900 lb ½ 6 6 6 6 4 7
¾ 6 6 6 6 6 7
1 7.5 7.5 7.5 7.5 9 8.5
1¼ 10 10 10 10 10 10
1½ 14 14 14 14 14 14
2 22 22 22 21 25 24
2½ 31 31 31 25 32 31
3 36 36 36 29 35 36
4 53 53 53 51 54 53
5 83 83 83 81 87 86
6 110 110 110 105 115 110
8 172 172 172 190 200 187
10 245 245 245 277 290 268
12 326 326 326 371 415 372
14 400 400 400 415 520 562
16 459 459 459 488 619 685
18 647 647 647 670 880 924
20 792 792 792 868 1107 1164
24 1480 1480 1480 1659 2099 2107
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
1500 lb ½ 6 6 6 6 4 7
¾ 6 6 6 6 6 7
1 8 8 8 8 9 9
1¼ 10 10 10 10 10 10
1½ 14 14 14 14 14 14
2 25 25 25 25 25 25
2½ 36 36 36 35 35 36
3 48 48 48 47 48 48
4 73 73 73 75 73 73
5 132 132 132 140 140 132
6 165 165 165 170 160 165
8 260 260 260 286 302 275
10 436 436 436 485 510 455
12 667 667 667 749 775 690
14 940 940 940 890 975 940
16 1250 1250 1250 1250 1300 1250
18 1625 1625 1625 1475 1750 1625
20 2050 2050 2050 1775 2225 2050
24 2825 2825 2825 2825 3625 3325
CLASS Nominal Pipe Size Slip On Threaded Socket Weld Lap Joint Blind Weld Neck
2500 lb ½ …. 7 …. 7 7 8
¾ …. 9 …. 8 10 9
1 …. 12 …. 12 12 13
1¼ …. 18 …. 17 18 20
1½ …. 25 …. 24 25 28
2 …. 38 …. 37 39 42
2½ …. 55 …. 53 56 52
3 …. 83 …. 80 86 94
4 …. 127 …. 122 133 146
5 …. 210 …. 204 223 244
6 …. 323 …. 314 345 378
8 …. 485 …. 471 533 576
10 …. 925 …. 897 1025 1068
12 …. 1300 …. 1262 1464 1608

Different Types of 321 stainless steel flange

ASME B16.5 UNS S32100 WNRF Flange
ASME B16.5 UNS S32100 WNRF Flange
A182 Gr F321h Forged Flanges
A182 Gr F321h Forged Flanges
321H SS Blind Flange
321H SS Blind Flange
Stainless Steel 321 Slip On Flanges
Stainless Steel 321 Slip On Flanges
ASTM A182 F 321 Threaded Flanges
ASTM A182 F 321 Threaded Flanges
SS 321H Socket Weld Flanges
SS 321H Socket Weld Flanges
WNR 1.4541 Weld Neck Flanges
WNR 1.4541 Weld Neck Flanges
ASTM A182 F321H RTJ Flange
ASTM A182 F321H RTJ Flange
ANSI B16.5 SS 321H SORF Flanges
ANSI B16.5 SS 321H SORF Flanges
SS Grade F321 WNRF Flanges
SS Grade F321 WNRF Flanges
ANSI B16.5 SS F321 Screwed Flanges
ANSI B16.5 SS F321 Screwed Flanges
astm a182 300# f321 stainless steel plate flat flange
astm a182 300# f321 stainless steel plate flat flange
321H Forged Stainless Steel Spectacle Blind Flange
321H Forged Stainless Steel Spectacle Blind Flange
321 ss Reducing Weld Neck Flange
321 ss Reducing Weld Neck Flange
321H 1
321H 1" SCH40S 150# Welding Neck Raised Face Flange
Stainless steel 150LB A182 F321 SW 1-1/2
Stainless steel 150LB A182 F321 SW 1-1/2" RF Flange
Best Price & Fast Delivery for ASTM A182 F 321 Threaded Flanges, One Stop Shop For SS 321 Socket Weld Flanges

Chemical Equation of SS 321 SORF Flange

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
SS 321H 0.04 - 0.10 2.0 max 1.0 max 0.045 max 0.030 max 17.00 - 19.00 0.10 max 9.00 - 12.00 4(C+N) - 0.70 max

Mechanical Properties of WNR 1.4541 Weld Neck Flanges

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi - 75000 , MPa - 515 Psi - 30000 , MPa - 205 35 %

Equivalent Grade of ANSI B16.5 SS F321 Screwed Flanges

STANDARD WERKSTOFF NR. UNS JIS EN
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9
Ask for free sample of WNR 1.4541 Weld Neck Flanges. ASTM A182 F321H RTJ Flange are available in different sizes

Check reference of material we Supplied in following countries

321 flat weld neck stainless steel floor flange Dammam -KSA, Philippines, Belgium, Canada
Forged stainless steel 321h orifice flange Qatar, Europe, Thailand, Malaysia
SS ASTM A182 F321 Flange Czechia, Thailand, Malaysia, Japan
PN40 321 stainless steel welding neck flange Malaysia, Bangladesh, Finland, Colombia
321h stainless steel pipe flange 150# 3 inch South Africa, Kuwait, Brazil, Taiwan
A182 F321 stainless steel forging 32" flange class 150 WN Bahrain, Singapore, Singapore, South Korea
3 inch dn900 321 stainless steel pipe flange Philippines, UK, Nigeria, Indonesia
321h Stainless Steel 150# SORF 1/2'' Flange Oman, Hong Kong, UAE, France
Sch40 2'' A182 F321 Stainless Steel Threaded Flange Chile, Iran, Singapore, Germany
321h 2inch class150 socket weld flange Netherlands, Romania, Ellington -United States, USA
ANSI B16.5 SS 321 Slip On Flanges Egypt, Malaysia, Singapore, Saudi Arabia (KSA)
SS GOST 08Х18Н10 Socket Weld Flanges United Kingdom -UK, Los Alamos -Mexico, Malaysia, South Africa
#150 ANSI SS UNS S32100 Pipe Flanges Sweden, NY 12203 (USA), China, Australia
ANSI B16.5 Standard Stainless Steel 321 Forged Pipe Flanges From Class 150 to 2500 UK, Malaysia, Philippines, Malaysia
JIS SUS 321 Reducing Weld Neck Flange Philippines, Poland, Malaysia, Italy
150# 8 inches astm b16.5 stainless steel rtj f321h BLIND flange Europe, Canada, Dubai, Turkey
321H CL300 Stainless Steel Forged Blind Flange United Arab Emirates (UAE), Norway, Malaysia, Europe
321 ansi b16.5 PF plate flat flange Malaysia, Russia, UAE, Malaysia
321h high precision stainless steel flange Singapore, Mexico, UK, Spain