
Why Stockists in Oman should buy ASTM B381 Forged Flanges from Ganpat Industrial?
- Material advantages
- Specification clarity
- Stockist value proposition
- Traceability
Top ASME SB 381 Forged Flanges Manufacturer in India in Various Grades
Specification of ASTM B381 Forged Flanges
- SCH: Sch 5 to XXS
- NPS: 1/2″ to 48″
- Class:150 to 2500#
- Life Span:More than 50 years
- Blind
- Socket Weld
- Slip On
- Weld Neck etc.
- ASME B16.47 Series A & B
- MSS SP44
- ASME B16.5
- ASTM A182 | ASME SA 182
- Casting
- Forging
- Cutting
- Rolling
- FNPT
- BSPT
- BSPP
- NPT, MNPT
- Pressure
- Tensile
- PMI
- Hardness test
- Spiral/Concentric
- Mirror
- Smooth
- Serrated
- FF
- RF
- RTJ
- T&G
- Indian
- European
- Japan
- Korean
- Low maintenance
- High tensile strength
- Excellent resistance
- Gasket
- Flange Bolts
- Ring Joint
- X-ray Detector
- NDT
- Hydro test
ASME SB 381 Forged Flanges Standards
Most Genuine ASTM B381 Forged Flanges Manufacturer in India As Per International Standards
| Standards | |
|---|---|
| Material Standard | ASME SB 381 / ASTM B381 |
| ASME SB 348 / ASTM B348 | |
| ISO 24034 | |
| Flange Dimension Standards | ASME B16.5 |
| ASME B16.47 Series A/B | |
| ASME B16.48 | |
| EN 1092-1 | |
| DIN 2631 – 2638 | |
| JIS B2220 | |
| International Equivalents | UNS R50400 / R56400 / etc. |
| Werkstoff 3.7035 / 3.7165 | |
| BS 4504 / BS 10 | |

| Normal Pipe Size | Flanges Diameter (‘O’) |
Diameter of (B.C.) ‘A’ |
Flanges Wall Thickness ‘C’ |
Diameter of (B.H.) ‘D’ |
Holes Number |
(Flanges) Diameter of Hub ‘E’ |
Diameter (Flanges) at Weld Bevel | Diameter of (RF) R |
Depth of Socket Weld F |
Threading Length |
Length Of Through Hub | Bore (‘B’) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SORF/ SWRF (Y) |
WNRF (Y) |
Lap Joit (Y) |
SORF/ SWRF (B) |
Lap Joit (B) |
||||||||||||
| 1” | 25 | 123.8 | 88.9 | 17.5 | 19.0 | 4 | 54.0 | 33.5 | 50.8 | 12.7 | 17.5 | 27.0 | 61.9 | 27.0 | 34.5 | 35.0 |
| 1 | 32 | 133.3 | 98.4 | 20.6 | 19.0 | 4 | 63.5 | 42.2 | 63.5 | 14.3 | 20.6 | 28.6 | 66.7 | 28.6 | 43.2 | 43.7 |
| 1 | 40 | 155.6 | 114.3 | 22.2 | 22.2 | 4 | 69.8 | 48.3 | 73.0 | 15.9 | 22.2 | 31.7 | 69.8 | 31.7 | 49.5 | 50.0 |
| 2” | 50 | 165.1 | 127.0 | 25.4 | 19.0 | 8 | 84.1 | 60.4 | 92.1 | 17.5 | 25.4 | 36.5 | 73.0 | 36.5 | 62.0 | 62.5 |
| 2 | 65 | 190.5 | 149.2 | 28.6 | 22.2 | 8 | 100.0 | 73.1 | 104.8 | 19.0 | 28.6 | 41.3 | 79.4 | 41.3 | 74.7 | 75.4 |
| 1/2” | 15 | 95.2 | 66.7 | 14.3 | 15.9 | 4 | 38.1 | 21.3 | 34.9 | 9.5 | 15.9 | 22.2 | 52.4 | 22.2 | 22.3 | 22.9 |
| 3/4” | 20 | 117.5 | 82.5 | 15.9 | 19.0 | 4 | 47.6 | 26.7 | 42.9 | 11.1 | 15.9 | 25.4 | 57.1 | 25.4 | 27.7 | 28.2 |
| 3” | 80 | 209.5 | 168.3 | 31.8 | 22.2 | 8 | 117.5 | 88.9 | 127.0 | – | 30.2 | 46.0 | 82.5 | 46.0 | 90.7 | 91.4 |
| 3 | 90 | 228.5 | 184.2 | 34.9 | 22.2 | 8 | 133.4 | 101.6 | 140.0 | – | 31.7 | 49.3 | 85.7 | 49.3 | 103.4 | 104.1 |
| 4” | 100 | 273.0 | 215.9 | 38.1 | 25.4 | 8 | 152.4 | 114.3 | 157.2 | – | 33.3 | 54.0 | 101.6 | 54.0 | 116.1 | 116.8 |
| 5” | 125 | 330.2 | 266.7 | 44.4 | 28.6 | 8 | 188.9 | 141.2 | 185.7 | – | 36.5 | 60.3 | 114.3 | 60.3 | 143.8 | 144.5 |
| 6” | 150 | 355.6 | 292.1 | 47.6 | 28.6 | 12 | 222.2 | 168.4 | 215.9 | – | 39.7 | 66.7 | 117.5 | 66.7 | 170.7 | 171.4 |
| 8” | 200 | 419.1 | 349.2 | 55.6 | 31.7 | 12 | 273.0 | 219.2 | 269.9 | – | 44.4 | 76.2 | 133.3 | 76.2 | 221.5 | 222.2 |
| 10” | 250 | 508.0 | 431.8 | 63.5 | 34.9 | 16 | 342.9 | 273.0 | 323.8 | – | 49.2 | 85.7 | 152.4 | 111.2 | 276.3 | 277.4 |
| 12” | 300 | 558.8 | 488.9 | 66.7 | 34.9 | 20 | 400.0 | 323.8 | 381.0 | – | 55.6 | 92.1 | 155.6 | 117.3 | 327.1 | 328.2 |
| 14” | 350 | 603.2 | 527.0 | 69.9 | 38.1 | 20 | 431.8 | 355.6 | 412.7 | – | 57.1 | 93.7 | 165.1 | 127.0 | 359.1 | 360.2 |
| 16” | 400 | 685.8 | 603.2 | 76.2 | 41.3 | 20 | 495.3 | 406.4 | 469.9 | – | 63.5 | 106.4 | 177.8 | 139.7 | 410.5 | 411.2 |
| 18” | 450 | 742.9 | 654.0 | 82.6 | 44.4 | 24 | 546.1 | 457.2 | 533.4 | – | 68.3 | 117.5 | 184.1 | 152.4 | 461.8 | 462.3 |
| 20” | 500 | 812.8 | 723.9 | 88.9 | 44.4 | 24 | 609.6 | 508.0 | 584.2 | – | 73.0 | 127.0 | 190.5 | 165.1 | 513.1 | 514.3 |
| 24” | 600 | 939.8 | 838.2 | 101.6 | 50.8 | 24 | 717.5 | 609.6 | 692.1 | – | 82.5 | 139.7 | 203.2 | 184.1 | 615.9 | 615.9 |
Buy Custom Size ASTM B 381 Titanium Alloy Forging Stock At Reasonable Price
Class 150 ASTM B 381 Titanium Alloy Flange Dimensions
| NPS | Flange Of Outside Diameter | Diameter Of Raised Face | Hub Diameter At Welding Point | Wall Thickness Of Flange | Hub Diameter At Base | Welding Neck (WNRF) | Slip On (SORF) | Welding Neck (WNRF) | Slip On (SORF) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | mm |
| 1″ | 25 | 4.25 | 107.95 | 2.00 | 50.80 | 1.32 | 33.53 | 0.56 | 14.29 | 1.94 | 49.21 | 1.05 | 26.67 | 1.36 | 34.54 | 2.19 | 55.56 | 0.69 | 17.46 |
| 1-1/4″ | 32 | 4.63 | 117.48 | 2.50 | 63.50 | 1.66 | 42.16 | 0.63 | 15.88 | 2.31 | 58.74 | 1.38 | 35.05 | 1.70 | 43.18 | 2.25 | 57.15 | 0.81 | 20.64 |
| 1-1/2″ | 40 | 5.00 | 127.00 | 2.88 | 73.03 | 1.90 | 48.26 | 0.69 | 17.46 | 2.56 | 65.09 | 1.61 | 40.89 | 1.95 | 49.53 | 2.44 | 61.91 | 0.88 | 22.23 |
| 2″ | 50 | 6.00 | 152.40 | 3.63 | 92.08 | 2.38 | 60.45 | 0.75 | 19.05 | 3.06 | 77.79 | 2.07 | 52.58 | 2.44 | 61.98 | 2.50 | 63.50 | 1.00 | 25.40 |
| 2-1/2″ | 65 | 7.00 | 177.80 | 4.13 | 104.78 | 2.88 | 73.15 | 0.88 | 22.23 | 3.56 | 90.49 | 2.47 | 62.74 | 2.94 | 74.68 | 2.75 | 69.85 | 1.13 | 28.58 |
| 3-1/2″ | 90 | 8.50 | 215.90 | 5.50 | 139.70 | 4.00 | 101.60 | 0.94 | 23.81 | 4.81 | 122.24 | 3.55 | 90.17 | 4.07 | 103.38 | 2.81 | 71.44 | 1.25 | 31.75 |
| 4″ | 100 | 9.00 | 228.60 | 6.19 | 157.16 | 4.50 | 114.30 | 0.94 | 23.81 | 5.31 | 134.94 | 4.03 | 102.36 | 4.57 | 116.08 | 3.00 | 76.20 | 1.31 | 33.34 |
| 5″ | 125 | 10.00 | 254.00 | 7.31 | 185.74 | 5.56 | 141.22 | 0.94 | 23.81 | 6.44 | 163.51 | 5.05 | 128.27 | 5.66 | 143.76 | 3.50 | 88.90 | 1.44 | 36.51 |
| 1/2″ | 15 | 3.50 | 88.90 | 1.38 | 34.93 | 0.84 | 21.34 | 0.44 | 11.11 | 1.19 | 30.16 | 0.62 | 15.75 | 0.88 | 22.35 | 1.88 | 47.63 | 0.63 | 15.88 |
| 3/4″ | 20 | 3.88 | 98.43 | 1.69 | 42.86 | 1.05 | 26.67 | 0.50 | 12.70 | 1.50 | 38.10 | 0.82 | 20.83 | 1.09 | 27.69 | 2.06 | 52.39 | 0.63 | 15.88 |
| 3″ | 80 | 7.50 | 190.50 | 5.00 | 127.00 | 3.50 | 88.90 | 0.94 | 23.81 | 4.25 | 107.95 | 3.07 | 77.98 | 3.57 | 90.68 | 2.75 | 69.85 | 1.19 | 30.16 |
| 6″ | 150 | 11.00 | 279.40 | 8.50 | 215.90 | 6.63 | 168.40 | 1.00 | 25.40 | 7.56 | 192.09 | 6.07 | 154.18 | 6.72 | 170.69 | 3.50 | 88.90 | 1.56 | 39.69 |
| 8″ | 200 | 13.50 | 342.90 | 10.63 | 269.88 | 8.63 | 219.20 | 1.13 | 28.58 | 9.69 | 246.06 | 7.98 | 202.69 | 8.72 | 221.49 | 4.00 | 101.60 | 1.75 | 44.45 |
| 10″ | 250 | 16.00 | 406.40 | 12.75 | 323.85 | 10.75 | 273.05 | 1.19 | 30.16 | 12.00 | 304.80 | 10.02 | 254.51 | 10.88 | 276.35 | 4.00 | 101.60 | 1.94 | 49.21 |
| 12″ | 300 | 19.00 | 482.60 | 15.00 | 381.00 | 12.75 | 323.85 | 1.25 | 31.75 | 14.38 | 365.13 | 12.00 | 304.80 | 12.88 | 327.15 | 4.50 | 114.30 | 2.19 | 55.56 |
| 14″ | 350 | 21.00 | 533.40 | 16.25 | 412.75 | 14.00 | 355.60 | 1.38 | 34.93 | 15.75 | 400.05 | 13.25 | 336.55 | 14.14 | 359.16 | 5.00 | 127.00 | 2.25 | 57.15 |
| 16″ | 400 | 23.50 | 596.90 | 18.50 | 469.90 | 16.00 | 406.40 | 1.44 | 36.51 | 18.00 | 457.20 | 15.25 | 387.35 | 16.16 | 410.46 | 5.00 | 127.00 | 2.50 | 63.50 |
| 18″ | 450 | 25.00 | 635.00 | 21.00 | 533.40 | 18.00 | 457.20 | 1.56 | 39.69 | 19.88 | 504.83 | 17.25 | 438.15 | 18.18 | 461.77 | 5.50 | 139.70 | 2.69 | 68.26 |
| 20″ | 500 | 27.50 | 698.50 | 23.00 | 584.20 | 20.00 | 508.00 | 1.69 | 42.86 | 22.00 | 558.80 | 19.25 | 488.95 | 20.20 | 513.08 | 5.69 | 144.46 | 2.88 | 73.03 |
| 24″ | 600 | 32.00 | 812.80 | 27.25 | 692.15 | 24.00 | 609.60 | 1.88 | 47.63 | 26.13 | 663.58 | 23.25 | 590.55 | 24.25 | 615.95 | 6.00 | 152.40 | 3.25 | 82.55 |
ASME SB381 Slip On Flanges Wall Thickness
| NPS | (O.D) | Number of Bolt Holes | Minimum Wall Thickness (T) |
Holes Diameter | (RF) Diameter (R) |
SO Length (SL) |
WN Length (WL) |
BC (Bolt Circle) |
Diameter Hub Base (HB) |
SO Bore Inner Diameter (SB) |
Diameter of Hub Top (HT) |
WN Bore Inner Diameter (WB) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1⁄2 | 3.50 | 4 | 0.38 | 0.62 | 1.38 | 0.56 | 1.81 | 2.38 | 1.19 | 0.88 | 0.84 | 0.62 |
| 1 | 4.25 | 4 | 0.50 | 0.62 | 2.00 | 0.62 | 2.12 | 3.12 | 1.94 | 1.36 | 1.32 | 1.05 |
| 11⁄4 | 4.62 | 4 | 0.56 | 0.62 | 2.50 | 0.75 | 2.19 | 3.50 | 2.31 | 1.70 | 1.66 | 1.38 |
| 11⁄2 | 5.00 | 4 | 0.62 | 0.62 | 2.88 | 0.81 | 2.38 | 3.88 | 2.56 | 1.95 | 1.90 | 1.61 |
| 2 | 6.00 | 4 | 0.69 | 0.75 | 3.62 | 0.94 | 2.44 | 4.75 | 3.06 | 2.44 | 2.38 | 2.07 |
| 3⁄4 | 3.88 | 4 | 0.44 | 0.62 | 1.69 | 0.56 | 2.00 | 2.75 | 1.50 | 1.09 | 1.05 | 0.82 |
| 21⁄2 | 7.00 | 4 | 0.81 | 0.75 | 4.12 | 1.06 | 2.69 | 5.50 | 3.56 | 2.94 | 2.88 | 2.47 |
| 3 | 7.50 | 4 | 0.88 | 0.75 | 5.00 | 1.12 | 2.69 | 6.00 | 4.25 | 3.57 | 3.50 | 3.07 |
| 31⁄2 | 8.50 | 8 | 0.88 | 0.75 | 5.50 | 1.19 | 2.75 | 7.00 | 4.81 | 4.07 | 4.00 | 3.55 |
| 4 | 9.00 | 8 | 0.88 | 0.75 | 6.19 | 1.25 | 2.94 | 7.50 | 5.31 | 4.57 | 4.50 | 4.03 |
| 5 | 10.00 | 8 | 0.88 | 0.88 | 7.31 | 1.38 | 3.44 | 8.50 | 6.44 | 5.66 | 5.56 | 5.05 |
| 6 | 11.00 | 8 | 0.94 | 0.88 | 8.50 | 1.50 | 3.44 | 9.50 | 7.56 | 6.72 | 6.63 | 6.07 |
| 8 | 13.50 | 8 | 1.06 | 0.88 | 10.62 | 1.69 | 3.94 | 11.75 | 9.69 | 8.72 | 8.63 | 7.98 |
| 10 | 16.00 | 12 | 1.12 | 1.00 | 12.75 | 1.88 | 3.94 | 14.25 | 12.00 | 10.88 | 10.75 | 10.02 |
| 12 | 19.00 | 12 | 1.19 | 1.00 | 15.00 | 2.12 | 4.44 | 17.00 | 14.38 | 12.88 | 12.75 | 12.00 |
| 14 | 21.00 | 12 | 1.31 | 1.12 | 16.25 | 2.19 | 4.94 | 18.75 | 15.75 | 14.14 | 14.00 | 13.25 |
| 16 | 23.50 | 16 | 1.38 | 1.12 | 18.50 | 2.44 | 4.94 | 21.25 | 18.00 | 16.16 | 16.00 | 15.25 |
| 18 | 25.00 | 16 | 1.50 | 1.25 | 21.00 | 2.62 | 5.44 | 22.75 | 19.88 | 18.18 | 18.00 | 17.25 |
| 20 | 27.50 | 20 | 1.62 | 1.25 | 23.00 | 2.81 | 5.62 | 25.00 | 22.00 | 20.20 | 20.00 | 19.25 |
| 22 | 29.50 | 20 | 1.75 | 1.38 | 25.25 | 3.07 | 5.82 | 27.25 | 24.25 | 22.22 | 22.00 | 21.25 |
| 24 | 32.00 | 20 | 1.81 | 1.38 | 27.25 | 3.19 | 5.94 | 29.50 | 26.12 | 24.25 | 24.00 | 23.25 |
| Normal Pipe Size | DN |
|---|---|
| 1 | 25 |
| 1 1/4 | 32 |
| 1 1/2 | 40 |
| 1/2 | 15 |
| 3/4 | 20 |
| 2 | 50 |
| 2 1/2 | 65 |
| 3 | 80 |
| 4 | 100 |
Best ASME SB381 Slip On and Blind Flanges Supplier in Mumbai With Pressure Class 150 to 2500#
ASME B381 Weld Neck Flange Pressure Temperature Rating
| ASME/ ANSI B16.5 | Pressure Rating | ||||||
|---|---|---|---|---|---|---|---|
| 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 |
| 1050 | 20 | 310 | 410 | 615 | 925 | 1545 | 2570 |
| 650 | 125 | 430 | 575 | 860 | 1290 | 2150 | 3580 |
| 700 | 110 | 425 | 565 | 850 | 1275 | 2125 | 3540 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 1100 | 20 | 255 | 345 | 515 | 770 | 1285 | 2145 |
| 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 |
| 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 |
SB 381 Pipe Flanges Weight Chart
Certified ASTM B381 Forged Flanges Supplier in India of high-integrity products with proven resistance to fatigue.
| NPS | Holes | Diameter of Bolts | Diameter of Bolt Circle | Welding Neck (WN) | Blind (BLRF) | Slip On (SORF) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | mm | # | Inch | mm | Inch | mm | LB | Kilogram | LB | kg | LB | kg |
| 2-1/2″ | 65 | 4 | 0.63 | 15.88 | 5.50 | 139.70 | 5.02 | 2.28 | 4.05 | 1.84 | 4.37 | 1.98 |
| 1″ | 25 | 4 | 0.50 | 12.70 | 3.13 | 79.38 | 1.56 | 0.71 | 1.70 | 0.77 | 1.56 | 0.71 |
| 1-1/4″ | 32 | 4 | 0.50 | 12.70 | 3.50 | 88.90 | 1.88 | 0.85 | 1.88 | 0.85 | 1.88 | 0.85 |
| 1-1/2″ | 40 | 4 | 0.50 | 12.70 | 3.88 | 98.43 | 2.50 | 1.13 | 2.20 | 1.00 | 2.50 | 1.13 |
| 1/2″ | 15 | 4 | 0.50 | 12.70 | 2.38 | 60.33 | 0.94 | 0.43 | 1.26 | 0.57 | 0.94 | 0.43 |
| 3/4″ | 20 | 4 | 0.50 | 12.70 | 2.75 | 69.85 | 1.26 | 0.57 | 1.56 | 0.71 | 1.26 | 0.57 |
| 2″ | 50 | 4 | 0.63 | 15.88 | 4.75 | 120.65 | 3.76 | 1.71 | 2.50 | 1.13 | 3.13 | 1.42 |
| 3″ | 80 | 4 | 0.63 | 15.88 | 6.00 | 152.40 | 6.26 | 2.84 | 5.63 | 2.55 | 5.32 | 2.41 |
| 3-1/2″ | 90 | 8 | 0.63 | 15.88 | 7.00 | 177.80 | 7.37 | 3.34 | 8.45 | 3.83 | 6.87 | 3.12 |
| 4″ | 100 | 8 | 0.63 | 15.88 | 7.50 | 190.50 | 9.40 | 4.26 | 10.75 | 4.88 | 8.13 | 3.69 |
| 5″ | 125 | 8 | 0.75 | 19.05 | 8.50 | 215.90 | 12.00 | 5.44 | 12.00 | 5.44 | 9.40 | 4.26 |
| 6″ | 150 | 8 | 0.75 | 19.05 | 9.50 | 241.30 | 15.00 | 6.80 | 17.00 | 7.71 | 12.25 | 5.56 |
| 8″ | 200 | 8 | 0.75 | 19.05 | 11.75 | 298.45 | 24.50 | 11.11 | 28.75 | 13.04 | 18.25 | 8.28 |
| 10″ | 250 | 12 | 0.88 | 22.23 | 14.25 | 361.95 | 32.50 | 14.74 | 42.50 | 19.27 | 25.50 | 11.56 |
| 12″ | 300 | 12 | 0.88 | 22.23 | 17.00 | 431.80 | 50.00 | 22.68 | 67.00 | 30.39 | 38.75 | 17.57 |
| 14″ | 350 | 12 | 1.00 | 25.40 | 18.75 | 476.25 | 62.25 | 28.23 | 80.00 | 36.28 | 52.00 | 23.58 |
| 16″ | 400 | 16 | 1.00 | 25.40 | 21.25 | 539.75 | 78.00 | 35.37 | 103.00 | 46.71 | 57.00 | 25.85 |
| 18″ | 450 | 16 | 1.13 | 28.58 | 22.75 | 577.85 | 86.00 | 39.00 | 127.00 | 57.60 | 74.00 | 33.56 |
| 20″ | 500 | 20 | 1.13 | 28.58 | 25.00 | 635.00 | 104.00 | 47.17 | 166.00 | 75.28 | 94.00 | 42.63 |
| 24″ | 600 | 20 | 1.25 | 31.75 | 29.50 | 749.30 | 159.00 | 72.11 | 251.00 | 113.83 | 128.00 | 58.05 |
Offer European Origin B381 Weld Neck Flange Ready Stock As Per ASME B16.5 With Sch 5 to XXS
ASME B381 Weld Neck Flange Schedule Chart
| Flange Schedule | Pipe Size – Pipe Flanges | Max. Pressure | Flange Connection Type |
|---|---|---|---|
| ASME B16.5 Class 150 | 1/2″ | 150 psi | FNPT |
| 1/2″ | 275 psi | Socket Weld | |
| 1/2″ | 150 psi | Welded | |
| 3/4″ | 150 psi | FNPT | |
| 3/4″ | 275 psi | Socket Weld | |
| 1-1/4″ | 275 psi | Socket Weld | |
| 1-1/2″ | 275 psi | Socket Weld | |
| 2″ | 150 psi | FNPT | |
| 2″ | 275 psi | Socket Weld | |
| 2-1/2″ | 275 psi | Socket Weld | |
| 3″ | 275 psi | Socket Weld | |
| 4″ | 150 psi | FNPT | |
| 4″ | 275 psi | Socket Weld | |
| ASME B16.5 Class 300 | 1/2″ | 720 psi | Slip On |
| 1/2″ | 720 psi | Slip On | |
| 1″ | 720 psi | Slip On | |
| 1″ | 720 psi | Slip On | |
| 1-1/4″ | 720 psi | FNPT | |
| 1-1/4″ | 720 psi | Slip On | |
| 1-1/2″ | 720 psi | Slip On | |
| 1-1/2″ | 720 psi | Slip On | |
| 2″ | 720 psi | Slip On | |
| 2″ | 720 psi | Slip On | |
| 2-1/2″ | 720 psi | Slip On | |
| 2-1/2″ | 720 psi | Slip On | |
| 3″ | 720 psi | Slip On | |
| 3″ | 720 psi | Slip On | |
| 4″ | 720 psi | Slip On | |
| 4″ | 720 psi | Slip On |
Most Common Types Of ASTM B381 Flange
Best ASTM B381 Flange Supplier in India, Stock and Supply Custom Shapes As Per Your Project Requirment
ASTM B 381 Titanium Alloy Forging Testings
Reliable ASTM B381 Forged Flanges Manufacturer in India with a commitment to innovation and product integrity.
- Flattening test
- Intergranular corrosion test
- Pitting resistance test
- Spectro analysis
- Micro and macro tests
- PMI (Positive Material Identification) testing
- Hardness test
Find Forged and Rolled SB 381 Pipe Flanges With Different Face like FF, RF, RTJ For High-Temperature Application
Rolled SB 381 Pipe Flanges Applications

ASME SB381 Blind Flanges Faces
| Face Type | Surface Finishes | |
|---|---|---|
| FF | Flat Face | 125-250 µin (3.2-6.3 µm) Ra |
| RF | Raised Face | 125-250 µin (3.2-6.3 µm) Ra for soft gaskets 63-125 µin (1.6-3.2 µm) Ra for metallic gaskets |
| RTJ | Ring Type Joint | Precision machined groove surface |
| TG | Tongue and Groove | 63-125 µin (1.6-3.2 µm) Ra |
| MJ | Male and Female | 63-125 µin (1.6-3.2 µm) Ra |
| LG | Lap Joint (Flat Face) | 125-250 µin (3.2-6.3 µm) Ra |
| SWF | Small / Smooth Wave Face | 125-250 µin (3.2-6.3 µm) Ra or per design |
ASTM B 381 Titanium Alloy Forging Equivalent
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Titanium Grade 2 | R50400 | 3.7035 |
| Titanium Grade 5 | R56400 | 3.7165 |
B381 Weld Neck Flange Mechanical Properties
| Grade | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
|---|---|---|---|
| Titanium Grade 2 | Psi – 39900 , MPa – 275 | Psi – 49900 , MPa – 344 | 20 % |
| Titanium Grade 5 | Psi – 128000 , MPa – 880 | Psi – 138000 , MPa – 950 | 14 % |
SB 381 Pipe Flanges Chemical Composition
| Grades | UNS Number | Fe | O | C | Al | V | N | H |
|---|---|---|---|---|---|---|---|---|
| Grade 1 | R50250 | 0.20 max | 0.18 max | 0.08 max | – | – | 0.03 max | 0.015 max |
| Grade 2 | R50400 | 0.30 max | 0.25 max | 0.08 max | – | – | 0.03 max | 0.015 max |
| Grade 3 | R50550 | 0.30 max | 0.35 max | 0.08 max | – | – | 0.05 max | 0.015 max |
| Grade 4 | R50700 | 0.50 max | 0.40 max | 0.08 max | – | – | 0.05 max | 0.015 max |
| Grade 5 | R56400 | 0.40 max | 0.20 max | 0.08 max | 5.5 – 6.75 | 3.5 – 4.5 | 0.05 max | 0.015 max |
| Grade 7 | R52400 | 0.30 max | 0.25 max | 0.08 max | – | – | 0.03 max | 0.015 max |
| Grade 9 | R56320 | 0.25 max | 0.20 max | 0.08 max | 2.5 – 3.5 | 2.0 – 3.0 | 0.03 max | 0.015 max |
Physical Properties of ASME SB 381 Forged Flanges
| Grades | Density (g/cm³) | Melting Point (°C) | Modulus of Elasticity (GPa) |
|---|---|---|---|
| Grade 1 | 4.51 | 1660 | 103 |
| Grade 2 | 4.51 | 1660 | 105 |
| Grade 3 | 4.51 | 1660 | 110 |
| Grade 4 | 4.51 | 1660 | 115 |
| Grade 5 | 4.43 | 1604 – 1660 | 113 |
| Grade 7 | 4.51 | 1660 | 105 |
| Grade 9 | 4.48 | 1650 | 102 |
SB 381 Lap Joint Flanges Documentations
- Certificate of Origin
- Fumigation Certificates
- Raw Material Test Reports
- Material Traceability Records
- Heat Treatment Charts
- Material Test Certificates (MTC)
- Quality Assurance Plan (QAP)
- NABL approved Laboratory Test Reports
B381 Weld Neck Flange Delivery Time As Per Country
| Export To | Shipping Time |
|---|---|
| Libya | 45-60 |
| Cambodia | 9 |
| Thailand | 7 |
| Kenya | 19 |
| Sri lanka | 6 |
| Russia | 20 |
| Norway | 45 |
| Egypt | 18 |
| Turkey | 21 |
| Kazakhstan | 45-60 |
| Australia | 21 |

