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In cases where there is a hot and pressurized line that needs to remain sealed for years without shutdown, it is the weld neck flange that is usually used. A long tapering hub is welded onto the pipe, and the inner diameter of this flange matches the pipe’s diameter, providing a smooth flow, and thus eliminating stress from building up around the joint.
Solitaire Overseas supplies alloy steel weld neck flanges forged from chrome moly steel to ASTM A182 in grades F1, F5, F9, F11, F22 and F91. They come in ASME B16.5 Class 150 to 2500 with raised face, flat face and ring type joint facings, and long weld neck flanges are made to your drawing. Each order ships with a mill test certificate to EN 10204 3.1.
| Specification | Details |
|---|---|
|
Size Range |
NPS 1/2 to 24 inch (15 NB to 600 NB) under ASME B16.5. NPS 26 to 48 inch under ASME B16.47 on request |
|
Standards |
ASME B16.5, ASME B16.47 Series A and B, ASME B16.25 for weld ends, MSS SP 44, EN 1092 1 Type 11 on request |
|
ANSI Pressure Ratings |
Class 150, 300, 600, 900, 1500 and 2500 LBS |
|
JIS Pressure Ratings |
5K to 63K to JIS B2220, on request |
|
EN Pressure Ratings |
PN 6 to PN 64 to EN 1092 1, on request |
|
Test Certificates |
EN 10204 3.1, 3.2 on request, raw material certificate, third party inspection report on request |
|
Production Process |
Forged, heat-treated and machined |
|
Flange Face Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ). Male and female and tongue and groove faces on request |
|
Testing Equipment |
Direct-reading Spectrograph, Hydrostatic Testing Machine, X-ray Detector, Ultrasonic Flaw Detector and Magnetic Particle Detector |
|
Manufacturing Standards |
ANSI, DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE and others |
| Grade | C | Mn | Si | Cr | Mo | P max | S max | Other Elements |
|---|---|---|---|---|---|---|---|---|
|
F1 |
0.28 max |
0.60 to 0.90 |
0.15 to 0.35 |
None specified |
0.44 to 0.65 |
0.045 |
0.045 |
|
|
F5 |
0.15 max |
0.30 to 0.60 |
0.50 max |
4.0 to 6.0 |
0.44 to 0.65 |
0.030 |
0.030 |
Ni 0.50 max |
|
F9 |
0.15 max |
0.30 to 0.60 |
0.50 to 1.00 |
8.0 to 10.0 |
0.90 to 1.10 |
0.030 |
0.030 |
|
|
F11 Class 1 |
0.05 to 0.15 |
0.30 to 0.60 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
0.030 |
0.030 |
|
|
F22 |
0.05 to 0.15 |
0.30 to 0.60 |
0.50 max |
2.00 to 2.50 |
0.87 to 1.13 |
0.040 |
0.040 |
|
|
F91 |
0.08 to 0.12 |
0.30 to 0.60 |
0.20 to 0.50 |
8.0 to 9.5 |
0.85 to 1.05 |
0.020 |
0.010 |
| Grade and class | Tensile, MPa minimum | Yield 0.2 per cent, MPa minimum | Elongation, per cent minimum |
|---|---|---|---|
|
F1 |
485 |
275 |
20 |
|
F5 |
485 |
275 |
20 |
|
F9 |
585 |
380 |
20 |
|
F11 Class 1 |
415 |
205 |
20 |
|
F11 Class 2 |
485 |
275 |
20 |
|
F11 Class 3 |
515 |
310 |
20 |
|
F22 Class 1 |
415 |
205 |
20 |
|
F22 Class 3 |
515 |
310 |
20 |
|
F91 |
585 |
415 |
20 |
| ANSI/ASME B16.34 | ANSI PRESSURE RATING | ||||||
|---|---|---|---|---|---|---|---|
| Temperature °F | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
|
-20 to 100 |
265 |
695 |
925 |
1390 |
2085 |
3470 |
5785 |
|
200 |
260 |
680 |
905 |
1360 |
2035 |
3395 |
5660 |
|
300 |
230 |
655 |
870 |
1305 |
1955 |
3260 |
5435 |
|
400 |
200 |
640 |
855 |
1280 |
1920 |
3200 |
5330 |
|
500 |
170 |
620 |
830 |
1245 |
1865 |
3105 |
5180 |
|
600 |
140 |
605 |
805 |
1210 |
1815 |
3025 |
5040 |
|
650 |
125 |
590 |
785 |
1175 |
1765 |
2940 |
4905 |
|
700 |
110 |
570 |
755 |
1135 |
1705 |
2840 |
4730 |
|
750 |
95 |
530 |
710 |
1065 |
1595 |
2660 |
4430 |
|
800 |
80 |
510 |
675 |
1015 |
1525 |
2540 |
4230 |
|
850 |
65 |
485 |
650 |
975 |
1460 |
2435 |
4060 |
|
900 |
50 |
450 |
600 |
900 |
1350 |
2245 |
3745 |
|
950 |
35 |
280 |
375 |
560 |
845 |
1405 |
2345 |
|
1000 |
20 |
165 |
220 |
330 |
495 |
825 |
1370 |
Alloy steel weld neck flanges are designed for severe thermal stress, elevated pressure and challenging operating conditions across several key applications:
If the line is not a high temperature one, a carbon steel flange will usually do and cost less. If it is corrosive rather than hot, look at stainless steel flanges.
Alloy steel weld neck flanges are forged chrome moly flanges with a long tapered hub that is butt welded to the pipe, with the bore matched to the pipe. The hub carries stress away from the joint, so they suit high pressure, high temperature and cyclic duty. They are made to ASTM A182.
Match the flange to your pipe and your design temperature. F11 suits general high temperature lines, F22 suits higher pressure steam and hydrogen service, and F91 suits power plant main steam. Your piping specification decides the grade, so send it with your enquiry and we confirm what we can supply.
ASTM A182 covers the forged alloy steel material and ASME B16.5 covers sizes from NPS 0.5 to 24 in classes 150 to 2500. ASME B16.47 covers NPS 26 to 60, and ASME B16.25 covers the weld bevel. Name each on your order so the flanges match your drawing.
Alloy steel weld neck flanges are made in ASME classes 150, 300, 400, 600, 900, 1500 and 2500, with class 400 less common. Tell us the class, size and facing on your datasheet and we confirm availability and delivery time.
Long weld neck flanges are made to your drawing, with the neck length, bore and wall set by you. Send the drawing with the grade, class and quantity, and we confirm whether we can supply them and the lead time.
Orders ship with a mill test certificate showing heat chemistry and mechanical test results traceable to the lot. Tell us at the enquiry stage if you need EN 10204 3.1 or 3.2, NACE testing, PMI or third party inspection, so it is planned into the delivery date.
Looking for alloy steel weld neck flanges for a refinery, power plant, petrochemical facility or industrial piping project?
Contact Solitaire Overseas with your required ASTM A182 grade, flange size, pressure class, facing and quantity. You can also share your technical datasheet or drawing to help us understand your exact requirement.