ASTM A350 LF2 Flange

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$60 $58

Weld Neck Flange 1" to 24" Class 150, 300, 600, 900, 1500, 2500 ASME B16.5

SKU: ZZ108 Category:

ASTM A350 LF2 WN Flange RFAs a leading steel flange manufacturer, we have been providing ASTM A350 LF2 CL1 flanges to European customers for a long time.

Common use grade is ASTM A350 LF2 Class 1, corresponding material for piping in ASTM A333 Grade 6 and pipe fittings in ASTM A420 WPL6. With yield strength minimum 240 Mpa, and tensile strength in 480 Mpa to 655 Mpa, impact test temperature at -45℃.

ASTM A350 Grade LF2 is a standard material specification for carbon and low alloy steel forgings, requiring notch toughness testing for piping components. This specification covers requirements such as chemical composition, mechanical properties and impact test for notch toughness.

LTCS LF2 Flange Material Properties

ASTM A350 LF2 WN flange RF, available in all pressure ratings and sizes, are butt-welded to the end of the pipe, and are usually specified when service conditions are severe and excellent workmanship necessary.

A350 LF2 is a low carbon alloy steel widely use in the manufacture of flanges, fittings, valves and other piping components. The LF2 designation specifically refers to low-temperature carbon steel flanges. These flanges are designed for use in low-temperature service applications, making them suitable for environments where temperatures can drop significantly.

We Can Supply ASTM A350 LF2 Flange Range

Grades: ASTM A350/ ASME SA350 Grade LF2 Class 1, 2, 3

Outer Diameters: 1/2” to 24” in ASME B16.5, up to 60” in ASME B16.47A/B

Wall Thickness Schedule: SCH 10, SCH 40, SCH 160 comply with ASME B16.9

Pressure Class: Class 150, 300, 600, 900, 1500, 2500

Seal Face:RF RJ FF

Manufacturing Standards: ASME B16.5, ASME B16.47 A, B

WN Flange RF Specification

Standard ASME B16.5 ASME B16.47 A, B
Diameter Range 1/2 to 60 inch / DN15-DN1500
Pressure Rate Class 150, 300, 600, 900, 1500, 2500
Product Weld Neck Flange & Long Neck Flange
Stainless Steel ASTM A182 F316/316L, F304/304L, SS317, SS321, SS310
Duplex Steel ASTM A182 F51, F53, F55
Carbon Steel ASTM A105N, A350 LF2, LF3
Alloy Steel ASTM A182 F1, F5, F9, F11, F12, F22 ,F91

ASTM A350 LF2 Flange Application

Oil and Gas Industries

Food Processing Industries

Pipeline

Power Industries

Ship Building Industries

Paper Industries

Cement Industries

Chemical Industries

ASTM A350 LF2 WN 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

Mechanical Properties

MATERIAL

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

197 max

Impact Test Temperature under ASTM A350 LF2 Flange

Impacet Test Temerature at -50°F[-46℃]

Size, mm

 Average/min, ft.lbs[J] One Specimen Only of a Set,ft.lbs[J]
10X10 15[20]

12[16]

Dimension & Weight of Weld Neck Flange

Class 150
Nominal
Pipe Size		 A B C D E F G H I J Weight
inch mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 88.90 15.70 11.20 47.80 21.30 30.20 35.00 4 15.70 60.45 0.48
3/4 26.70 98.60 20.80 12.70 52.30 26.70 38.10 42.90 4 15.70 69.85 0.71
1 33.40 108.0 26.70 14.20 55.60 33.50 49.30 50.80 4 15.70 79.25 1.01
11/4 42.20 117.3 35.10 15.70 57.15 42.20 58.70 63.50 4 15.70 88.90 1.33
11/2 48.30 127.0 40.90 17.50 62.00 48.30 65.00 73.15 4 15.70 98.60 1.72
2 60.30 152.4 52.60 19.10 63.50 60.45 77.70 91.90 4 19.10 120.7 2.58
21/2 73.00 177.8 62.70 22.40 69.85 73. 15 90.4 104.6 4 19.10 139.7 4.11
3 88.90 190.5 78.00 23.90 69.85 88.90 108.0 127.0 4 19.10 152.4 4.92
31/2 101.6 215.9 90.20 23.90 71.40 101.6 122.2 139.7 8 19.10 177.8 6.08
4 114.3 228.6 102.40 23.90 76.20 114.3 134.9 157.2 8 19.10 190.5 6.84
5 141.3 254.0 128.3 23.90 88.90 141.2 163.6 185.7 8 22.40 215.9 8.56
6 168.3 279.4 154.2 25.40 88.90 168.4 192.0 215.9 8 22.40 241.3 10.6
8 219.1 342.9 202.7 28.40 101.6 219.2 246.1 269.7 8 22.40 298.5 17.6
10 273.0 406.4 254.5 30.20 101.6 273.0 304.8 323.8 12 25.40 362.0 24.0
12 323.8 482.6 304.8 31.75 114.3 323.8 365.3 381.0 12 25.40 431.8 36.5
14 355.6 533.4 35.10 127.0 355.6 400.1 412.7 12 28.40 476.3 48.4
16 406.4 596.9 36.60 127.0 406.4 475.2 469.9 16 28.40 539.8 60.6
18 457.2 635.0 39.60 139.7 457.2 505.0 533.4 16 31.75 577.9 68.3
20 508.0 698.5 42.90 144.5 508.0 558.8 584.2 20 31.75 635.0 84.5
24 609.6 812.8 47.80 152.4 609.6 663.4 692.1 20 35.10 749.3 115

 

Class 300
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
 1/2 21.30 95.20 15.70 14.20 52.30 21.30 38.10 35.00 4 15.70 66.55 0.75
 3/4 26.70 117.3 20.80 15.70 57.15 26.70 47.70 42.90 4 19.00 82.50 1.26
1 33.40 123.9 26.70 17.50 62.00 33.50 53.80 50.80 4 19.00 88.90 1.52
1 1/4 42.20 133.3 35.10 19.00 65.00 42.20 63.50 63.50 4 19.00 98.50 2.03
1 1/2 48.30 155.4 40.90 20.60 68.30 48.30 69.85 73. 15 4 22.30 114.3 2.89
2 60.30 165. 1 52.60 22.30 69.85 60.45 84.00 91.90 8 19.00 127.0 3.4
2 1/2 73.00 190.5 62.70 25.40 76.20 73.15 100.0 104.6 8 22.30 149.3 5.17
3 88.90 209.5 78.00 28.40 79.25 88.90 117.3 127.0 8 22.30 168.1 6.93
3 1/2 101.6 228.6 90.20 30.20 81.00 101.6 133.3 139.7 8 22.30 184.1 8.67
4 114.3 254.0 102.4 31.70 85.80 114.3 146.0 157.2 8 22.30 200.1 11.2
5 141.3 279.4 128.3 35.00 98.50 141.2 177.8 185.7 8 22.30 234.9 15.1
6 168.3 317.5 154.2 36.50 98.50 168.4 206.2 215.9 12 22.30 269.7 19.1
8 219.1 381.0 202.7 41.10 111.2 219.2 260.3 269.7 12 25.40 330.2 29.9
10 273.0 444.5 254.5 47.70 117.3 273.0 320.5 323.8 16 28.40 387.3 42.7
12 323.8 520.7 304.8 50.80 130.0 323.8 374.6 381.0 16 31.70 450.8 61.8
14 355.6 584.2 53.80 142.7 355.6 425.4 412.7 20 31.70 514.3 85.8
16 406.4 647.7 57.15 146.0 406.4 482.6 469.9 20 35.00 571.5 106
18 457.2 711.2 60.45 158.7 457.2 533.4 533.4 24 35.00 628.6 131
20 508.0 774.7 63.50 162.0 508.0 587.2 584.2 24 35.00 685.8 158
24 609.6 914.4 69.85 168.1 609.6 701.5 692.1 24 41.10 812.8 230

 

Class 400
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 95.30 14.20 52.30 21.30 38.10 35.00 4 15.70 66.55 0.87
3/4 26.70 117.3 15.70 57.15 26.70 47.80 42.90 4 19.10 82.60 1.45
1 33.40 124.0 17.50 62.00 33.50 53.80 50.80 4 19.10 88.90 1.76
11/4 42.20 133.4 20.60 66.55 42.20 63.50 63.50 4 19.10 98.60 2.49
11/2 48.30 155.4 22.40 69.85 48.30 69.85 73.15 4 22.40 114.3 3.49
2 60.30 165.1 25.40 73.15 60.45 84.10 91.90 8 19.10 127.0 4.36
21/2 73.00 190.5 28.40 79.25 73.15 100.1 104.6 8 22.40 149.4 6.43
3 88.90 209.6 31.75 82.60 88.90 117.3 127.0 8 22.40 168. 1 8.53
31/2 101.6 228.6 35.10 85.90 101.6 133.4 139.7 8 25.40 84.2 10.7
4 114.3 254.0 35.10 88.90 114.3 146.1 157.2 8 25.40 200.2 12.8
5 141.3 279.4 38.10 101.6 141.2 177.8 185.7 8 25.40 235.0 16.9
6 168.3 317.5 41.10 103.1 168.4 206.2 215.9 12 25.40 269.7 22.0
8 219. 1 381.0 47.80 117.3 219.2 260.4 269.7 12 28.40 330.2 34.7
10 273.0 444.5 53.80 124.0 273.0 320.5 323.8 16 31.75 387.4 48.5
12 323.8 520.7 57.15 5.380
136.7		 323.8 374.7 381.0 16 35.10 450.9 69.6
14 355.6 584.2 60.45 149.4 355.6 425.5 412.7 20 35.10 514.4 95.5
16 406.4 647.7 63.50 152.4 406.4 482.6 469.9 20 38.10 571.5 118
18 457.2 711.2 66.55 165.1 457.2 533.4 533.4 24 38.10 628.7 145
20 508.0 774.7 69.85 168.1 508.0 587.2 584.2 24 41.10 685.8 173
24 609.6 914.4 76.20 174.8 609.6 701.5 692.1 24 47.80 812.8 249

 

Class 600
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 95.30 14.20 52.30 21.30 38.10 35.00 4 15.70 66.55 0.87
3/4 26.70 117.3 15.70 57.15 26.70 47.80 42.90 4 19.10 82.60 1.45
1 33.40 124.0 17.50 62.00 33.50 53.80 50.80 4 19.10 88.90 1.76
11/4 42.20 133.4 20.60 66.55 42.20 63.50 63.50 4 19.10 98.60 2.49
11/2 48.30 155.4 22.40 69.85 48.30 69.85 73. 15 4 22.40 114.3 3.49
2 60.30 165. 1 25.40 73.15 60.45 84.10 91.90 8 19.10 127.0 4.36
21/2 73.00 190.5 28.40 79.25 73.15 100.1 104.6 8 22.40 149.4 6.43
3 88.90 209.6 31.75 82.60 88.90 117.3 127.0 8 22.40 168.1 8.53
31/2 101.6 228.6 35.10 85.90 101.6 133.4 139.7 8 25.40 184.2 10.7
4 114.3 273. 1 38.10 101.6 114.3 152.4 157.2 8 25.40 215.9 17.4
5 141.3 330.2 44.50 114.3 141.2 189.0 185.7 8 28.40 266.7 29.2
6 168.3 355.6 47.80 117.3 168.4 222.3 215.9 12 28.40 292.1 34.9
8 219.1 419. 1 55.60 133.4 219.2 273.1 269.7 12 31.75 349.3 53.9
10 273.0 508.0 63.50 152.4 273.0 342.9 323.8 16 35.10 431.8 86.5
12 323.8 558.8 66.55 155.4 323.8 400.1 381.0 20 35.10 489.0 103
14 355.6 603.3 69.85 165.1 355.6 431.8 412.7 20 38.10 527.1 122
16 406.4 685.8 76.20 177.8 406.4 495.3 469.9 20 41.10 603.3 170
18 457.2 743.0 82.60 184.2 457.2 546.1 533.4 20 44.50 654.1 204
20 508.0 812.8 88.90 190.5 508.0 609.6 584.2 24 44.50 723.9 254
24 609.6 939.8 101.6 203.2 609.6 717.6 692.1 24 50.80 838.2 358

 

Class 900
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 120.6 22.30 60.45 21.30 38.10 35.00 4 22.30 82.50 1.87
3/4 26.70 130.0 25.40 69.85 26.70 44.00 42.90 4 22.30 88.90 2.56
1 33.40 149.3 28.40 73.15 33.50 52.30 50.80 4 25.40 101.6 3.74
11/4 42.20 158.7 28.40 73.15 42.20 63.50 63.50 4 25.40 111.2 4.33
11/2 48.30 177.8 31.70 82.50 48.30 69.85 73.15 4 28.40 123.9 5.94
2 60.30 215.9 38.10 101.6 60.45 104.6 91.90 8 25.40 165.1 10.8
21/2 73.00 244.3 41.10 104.6 73.15 123.9 104.6 8 28.40 190.5 15.0
3 88.90 241.3 38.10 101.6 88.90 127.0 127.0 8 25.40 190.5 13.7
4 114.3 292.1 44.40 114.3 114.3 158.7 157.2 8 31.70 234.9 22.5
5 141.3 349.2 50.80 127.0 141.2 190.5 185.7 8 35.00 279.4 37.4
6 168.3 381.0 55.60 139.7 168.4 234.9 215.9 12 31.70 317.5 47.7
8 219. 1 469.9 63.50 162.0 219.2 298.4 269.7 12 38.10 393.7 81.3
10 273.0 546.1 69.85 184. 1 273.0 368.3 323.8 16 38.10 469.9 119
12 323.8 609.6 79.25 200. 1 323.8 419.1 381.0 20 38.10 533.4 157
14 355.6 641.3 85.80 212.8 355.6 450.8 412.7 20 41.10 558.8 180
16 406.4 704.8 88.90 215.9 406.4 508.0 469.9 20 44.40 615.9 217
18 457.2 787.4 101.6 228.6 457.2 565.1 533.4 20 50.80 685.8 292
20 508.0 857.2 107.9 247.6 508.0 622.3 584.2 20 53.80 749.3 362
24 609.6 1041.4 139.7 292. 1 609.6 749.3 692.1 20 66.55 901.7 665

 

Class 1500
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 120.6 22.30 60.45 21.30 38.10 35.00 4 22.30 82.50 1.87
3/4 26.70 130.0 25.40 69.85 26.70 44.00 42.90 4 22.30 88.90 2.56
1 33.40 149.3 28.40 73.15 33.50 52.30 50.80 4 25.40 101.6 3.74
11/4 42.20 158.7 28.40 73.15 42.20 63.50 63.50 4 25.40 111.2 4.33
11/2 48.30 177.8 31.70 82.50 48.30 69.85 73. 15 4 28.40 123.9 5.94
2 60.30 215.9 38.10 101.6 60.45 104.6 91.90 8 25.40 165.1 10.8
21/2 73.00 244.3 41.10 104.6 73.15 123.9 104.6 8 28.40 190.5 15.0
3 88.90 266.7 47.70 177.3 88.9 133.3 127.0 8 31.70 203.2 19.9
4 114.3 311.1 53.80 123.9 114.3 162.0 157.2 8 35.00 241.3 29.9
5 141.3 374.6 73.15 155.4 141.2 196.8 185.7 8 41.10 292.1 55.4
6 168.3 393.7 82.50 171.4 168.4 228.6 215.9 12 38.10 317.5 68.4
8 219.1 482.6 91.90 212.8 219.2 292.1 269.7 12 44.40 393.7 117
10 273.0 584.2 107.9 254.0 273.0 368.3 323.8 12 50.80 482.6 194
12 323.8 673. 1 123.9 282.4 323.8 450.8 381.0 16 53.80 571.5 288
14 355.6 749.3 133.3 298.4 355.6 495.3 412.7 16 60.45 635.0 380
16 406.4 825.5 146.0 311. 1 406.4 552.4 469.9 16 66.55 704.8 485
18 457.2 914.4 162.0 327.1 457.2 596.9 533.4 16 73.15 774.7 644
20 508.0 984.2 177.8 355.6 508.0 641.3 584.2 16 79.25 831.8 775
24 609.6 1168.4 203.2 406.4 609.6 762.0 692.1 16 91.90 990.6 1232

 

Class 2500
Nominal
Pipe Size		 A B C D E F G H I J Weight
mm mm mm mm mm mm mm mm Holes mm mm kg/
piece
1/2 21.30 133.4 30.20 73. 15 21.30 42.90 35.00 4 22.40 88.90 3.12
3/4 26.70 139.7 31.75 79.25 26.70 50.80 42.90 4 22.40 95.30 3.70
1 33.40 158.8 35.10 88.90 33.50 57.15 50.80 4 25.40 108.0 5.24
11/4 42.20 184.2 38.10 95.30 42.20 73.15 63.50 4 28.40 130.0 7.74
11/2 48.30 203.2 44.50 111.3 48.30 79.25 73.15 4 31.75 146. 1 10.9
2 60.30 235.0 50.80 127.0 60.45 95.30 91.90 8 28.40 171.5 16.2
21/2 73.00 266.7 57.15 142.7 73.15 114.3 104.6 8 31.75 196.9 23.7
3 88.90 304.8 66.55 168.1 88.90 133.4 127.0 8 35.10 228.6 36.2
4 114.3 355.6 76.20 190.5 114.3 165.1 157.2 8 41.10 273. 1 55.3
5 141.3 419.1 91.90 228.6 141.2 203.2 185.7 8 47.80 323.9 92.5
6 168.3 482.6 108 273.1 168.4 235.0 215.9 8 53.80 368.3 143
8 219.1 552.5 127.0 317.5 219.2 304.8 269.7 12 53.80 438.2 215
10 273.0 673.1 165.1 419.1 273.0 374.7 323.8 12 66.55 539.8 406
12 323.8 762.0 184.2 463.6 323.8 441.5 381.0 12 73.15 619.3 572

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