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A350 LF2 Weld Neck Flange

A350 LF2 Weld Neck Flange is a kind of pipe fittings, which refers to a flange with a neck and a round pipe transition and is butt welded to the pipe.

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A350 LF2 Weld Neck Flange is a kind of pipe fittings, which refers to a flange with a neck and a round pipe transition and is butt welded to the pipe. Weld neck flange is not easy to deform, has good sealing, and is widely used. It is suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines.

A350 is a standard of the American Society for Testing and Materials (ASTM). The materials in A350 are used to manufacture low-temperature pressure parts, such as weld neck flanges, etc. These materials have good low-temperature toughness and other properties.In the petrochemical industry, A350 LF2 weld neck flanges are widely used in pipeline systems for transporting media such as crude oil and natural gas.

Specification of A350 LF2 Flange

Shape Type Regular and Long Neck
Sealing Face RF, FF, FTJ
Size Range 1/2″ – 48″/ DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME B16.5, ASME B16.47 Series A/B
Low Temp Carbon Steel ASTM A350 LF2/LF3

ASTM A350 LF2 Weld Neck Flange Chemical Composition

CHEMICAL LIMITS C Mn P S Si Cu Ni Cr Mo V Nb
ASTM A350 LF2 MIN 0.60 0.15
MAX 0.30 1.35 0.035 0.040 0.35 0.40 0.40 0.30 0.12 0.08 0.02

ASTM A350 LF2 Weld Neck Flange Mechanical Property

MATERIAL T.S (MPA) Y.S (MPA) EL % R/A % HARDNESS
ASTM A350 LF2 485-655 250 min 22 min 30 min 197 max

Class 150 lb Weld Neck Flange Dimensions 

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NPS A B C D E F G H I J W
inch inch inch inch inch inch inch No. of Holes inch inch kg/pc
mm mm mm mm mm mm mm mm mm
1/2 3.500 0.620 0.440 1.880 0.840 1.190 1.380 4 0.620 2.380 0.48
88.90 15.70 11.20 47.80 21.30 30.20 35.00 15.70 60.45
3/4 3.880 0.820 0.500 2.060 1.050 1.500 1.690 4 0.620 2.750 0.71
98.60 20.80 12.70 52.30 26.70 38.10 42.90 15.70 69.85
1 4.250 1.050 0.560 2.190 1.320 1.940 2.000 4 0.620 3.120 1.01
108.0 26.70 14.20 55.60 33.50 49.30 50.80 15.70 79.25
1-1/4 4.620 1.380 0.620 2.250 1.660 2.310 2.550 4 0.620 3.500 1.33
117.3 35.10 15.70 57.15 42.20 58.70 63.50 15.70 88.90
1-1/2 5.000 1.610 0.690 2.440 1.900 2.560 2.880 4 0.620 3.880 1.72
127.0 40.90 17.50 62.00 48.30 65.00 73.15 15.70 98.60
2 6.000 2.070 0.750 2.500 2.380 3.060 3.620 4 0.750 4.750 2.58
152.4 52.60 19.10 63.50 60.45 77.70 91.90 19.10 120.7
2-1/2 7.000 2.470 0.880 2.750 2.880 3.560 4.120 4 0.750 5.500 4.11
177.8 62.70 22.40 69.85 73.15 90.40 104.6 19.10 139.7
3 7.500 3.070 0.940 2.750 3.500 4.250 5.000 4 0.750 6.000 4.92
190.5 78.00 23.90 69.85 88.90 108.0 127.0 19.10 152.4
3-1/2 8.500 3.550 0.940 2.810 4.000 4.810 5.500 8 0.750 7.000 6.08
215.9 90.20 23.90 71.40 101.6 122.2 139.7 19.10 177.8
4 9.000 4.030 0.940 3.000 4.500 5.310 6.190 8 0.750 7.500 6.84
228.6 102.4 23.90 76.20 114.3 134.9 157.2 19.10 190.5
5 10.00 5.050 0.940 3.500 5.560 6.440 7.310 8 0.880 8.500 8.56
254.0 128.3 23.90 88.90 141.2 163.6 185.7 22.40 215.9
6 11.00 6.070 1.000 3.500 6.630 7.560 8.500 8 0.880 9.500 10.6
279.4 154.2 25.4 88.90 168.4 192.0 215.9 22.40 241.3
8 13.50 7.980 1.120 4.000 8.630 9.690 10.62 8 0.880 11.75 17.6
342.9 202.7 28.40 101.6 219.2 246.1 269.7 22.40 298.5
10 16.00 10.02 1.190 4.000 10.75 12.00 12.75 12 1.000 14.25 24.0
406.4 254.5 30.20 101.6 273.0 304.8 323.8 25.40 362.0
12 19.00 12.00 1.250 4.500 12.75 14.38 15.00 12 1.000 17.00 36.5
482.6 304.8 31.75 114.3 323.8 365.3 381.0 25.40 431.8
14 21.00 1.380 5.000 14.00 15.75 16.25 12 1.120 18.75 48.4
533.4 35.10 127.0 355.6 400.1 412.7 28.40 476.3
16 23.50 1.440 5.000 16.00 18.00 18.50 16 1.120 21.25 60.6
596.9 36.60 127.0 406.4 475.2 469.9 28.40 539.8
18 25.00 1.560 5.500 18.00 19.88 21.00 16 1.250 22.75 68.3
635.0 39.60 139.7 457.2 505.0 533.4 31.75 577.9
20 27.50 1.690 5.690 20.00 22.00 23.00 20 1.250 25.00 84.5
698.5 42.90 144.5 508.0 558.8 584.2 31.75 635
24 32.00 1.880 6.000 24.00 26.12 27.25 20 1.380 29.50 115
812.8 47.80 152.4 609.6 663.4 692.1 35.10 749.3

Weld Neck Flange Application Area

Oil and gas industry

Oil and gas pipelines

Offshore oil and gas platforms

Chemical industry

Low-temperature chemical processes

Chemical material transportation

Power industry

Low-temperature refrigeration systems

Construction and HVAC industries

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