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  • + (91) 98201 73071
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    Theater, Mumbai - 400004

Weld Neck Flange

Weld Neck Flange

Weld Neck Flange

At AK Steel (India), we supply premium-grade Weld Neck Flanges designed for high-pressure, high-temperature, and critical pipeline applications. Weld Neck Flanges provide superior strength due to their long tapered hub, which ensures smooth stress distribution and prevents turbulence at the weld joint. These flanges are widely used in Oil & Gas, Petrochemical, Power Generation, Shipbuilding, and High-Pressure Steam Applications.

Manufactured from Stainless Steel, Carbon Steel, Alloy Steel, and Duplex materials, our Weld Neck Flanges comply with global standards such as ASME B16.5, ASTM, DIN, and EN specifications. As an ISO 9001:2015 certified company, all flanges undergo rigorous testing including Hydro Testing, Ultrasonic Testing, Radiography, and PMI Testing to ensure mechanical stability, leak-proof performance, and dimensional accuracy. We maintain extensive stock for immediate delivery.

  • Materials: SS 304/316/316L/310, CS, Alloy Steel, Duplex.
  • Standards: ASME B16.5, B16.47, ASTM A182/A105.
  • Face Types: RF, RTJ, FF.
  • Manufacturing: Forged, CNC Machined, Heat Treated.
  • Quality: EN 10204 3.1 Certified, 100% PMI & Hydro Tested.
  • Size Range: ½" to 60" (DN15 to DN1500).

Specification Table of Weld Neck Flange

Product Name
Weld Neck Flange (Long Weld Neck & Standard Weld Neck)
Stainless Steel
Grades: 304, 304L, 316, 316L, 321, 347, 310S
Standard ASTM A182 F304/304L, F316/316L
Alloy Steel
Grades: ASTM A182 F5, F9, F11, F22
Use: High Temp & Pressure Applications
Carbon Steel
Standard: ASTM A105, A350 LF2 (Low Temp)
Use: Refineries, Power Plants
Duplex & Exotic
Duplex 2205, Super Duplex 2507, Inconel 625/718, Monel 400, Hastelloy C276
Size Range
½" to 60" (DN15 – DN1500)  |  Class 150 to Class 2500
Standards
ASME B16.5, ASME B16.47 Series A/B, DIN, EN 1092-1, JIS
Types
Standard Weld Neck, Long Weld Neck, RF/RTJ/FF Face, Heavy Hub, Custom Bored
Finish
Serrated Finish, Smooth Finish, Mirror Finish (SS)

Flange Weights by Pressure Class and Size in mm kg

Pipe Size (inch) 150 # 300 # 600 # 900 # 1500 # 2500 #
WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD
1/2″ 2 1 1 2 1 1 2 2 2 SEE 1500 # WEIGHTS 5 4 4 7 7 7
3/4″ 2 2 2 3 3 3 4 3 3 SEE 1500 # WEIGHTS 6 5 6 8 8 8
1″ 3 2 2 4 3 3 4 4 4 SEE 1500 # WEIGHTS 9 8 8 12 11 11
1 1/2″ 4 3 3 7 6 6 8 7 8 SEE 1500 # WEIGHTS 13 12 13 25 22 23
2″ 6 5 5 9 7 8 12 9 10 SEE 1500 # WEIGHTS 25 25 25 42 37 39
2 1/2″ 8 7 7 12 10 12 18 13 15 SEE 1500 # WEIGHTS 36 36 35 52 55 56
3″ 10 8 9 15 13 16 23 16 20 31 26 29 48 48 48 94 83 86
4″ 15 13 17 25 22 27 42 37 41 53 53 54 73 73 73 145 125 130
5″ 19 15 20 32 28 35 68 63 68 86 83 87 130 130 140 245 210 225
6″ 24 19 26 42 39 50 81 80 86 110 110 115 165 165 160 380 325 345
8″ 39 30 45 67 58 81 120 115 140 175 170 200 275 260 300 580 485 530
10″ 52 43 70 91 81 124 190 170 230 260 245 290 455 435 510 1075 930 1025
12″ 80 64 110 140 115 185 225 200 295 325 325 415 690 580 690 1525 1100 1300
14″ 110 90 140 180 165 250 280 230 355 400 400 520 940 NA 975 NA NA NA
16″ 140 98 180 250 190 295 390 330 495 495 425 600 1250 NA 1300 NA NA NA
18″ 150 130 220 320 250 395 475 400 630 680 600 850 1625 NA 1750 NA NA NA
20″ 180 165 285 400 315 505 590 510 810 830 730 1075 2050 NA 2225 NA NA NA
22″ 225 185 355 465 370 640 720 590 1000 NA NA NA NA NA NA NA NA NA
24″ 260 220 430 580 475 790 830 730 1250 1500 1400 2025 3325 NA 3625 NA NA NA