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ASTM A350 Gr. LF3 Flanges

ASTM A350 Gr. LF3 CL.2; WNRF flanges, ASME B16.5 Class 900, 10" SCH120; Supplied to an Indonesian client.

  • Description

Pipe flanges made from ASTM A350 Grade LF3 are generally used in low temperature services with notch toughness testing requirements. The ASTM A350 Grade LF3 refers to a low-alloy steel designated as “3.5% nickel steel” or “3.5-Ni steel”. The deliberately controlled addition of nickel content can reduce the brittle-ductile transition temperature, whereupon improve its low temperature notch toughness significantly. The flanges may be manufactured in accordance with ASME B16.5 or ASME B16.47, or custom-designed.

Pressure-Temperature Ratings

The pressure-temperature ratings of ASTM A350 Gr. LF3 flanges are the same as that of ASTM A105 flanges. The pressure-temperature ratings of 3.5Ni-steel flanges are provided in Tables 1-1 & 1-2 in bar and °C units, while those in Tables 2-1 & 2-2 are provided in psi and °F units.

Temp. °CWorking Pressures by Classes, bar
75#150#300#400#
−29~389.819.651.168.1
509.619.250.166.8
1008.817.746.662.1
1507.915.845.160.1
2006.913.843.858.4
2506.012.141.955.9
3005.110.239.853.1
3254.69.338.751.6
3503.18.437.650.1
375-7.436.448.5
400-6.534.746.3
425-5.528.838.4
450-4.623.030.7
475-3.717.423.2
500-2.811.815.7
538-1.45.97.9
*Table 1-1.

Temp. °CWorking Pressures by Classes, bar
600#900#1500#2500#
-29~38102.1153.2255.3425.5
50100.2150.4250.6417.7
10093.2139.8233.0388.3
15090.2135.2225.4375.6
20087.6131.4219.0365.0
25083.9125.8209.7349.5
30079.6119.5199.1331.8
32577.4116.1193.6322.6
35075.1112.7187.8313.0
37572.7109.1181.8303.1
40069.4104.2173.6289.3
42557.586.3143.8239.7
45046.069.0115.0191.7
47534.952.387.2145.3
50023.535.358.897.9
53811.817.729.549.2
*Table 1-2.

Temp. °FWorking Pressures by Classes, psi
75#150#300#400#
-20~100140285740985
200130260680905
300115230655870
400100200635845
50085170605805
60070140570755
65060125550730
700-110530710
750-95505675
800-80410550
850-65320425
900-50230305
950-35135185
1000-2085115
*Table 2-1.

Temp. °FWorking Pressures by Classes, psi
600#900#1500#2500#
-20~1001480222037056170
2001360203533955655
3001310196532705450
4001265190031705280
5001205181030155025
6001135170528404730
6501100165027454575
7001060159026554425
7501015152025354230
800825123520553430
85064095515952655
90046069011501915
9502754106851145
1000170255430715
*Table 2-2.

Chemical Composition Requirements

ASTM A350 Grade LF3
Chemical Requirements
ElementWeight %
C≤0.20
Mn≤0.90
P≤0.035
S≤0.040
*Si0.20~0.35
Ni3.3~3.7
Cr≤0.30
Mo≤0.12
Cu≤0.40
Nb≤0.02
V≤0.03
*When flanges made to ASTM A350 LF3 are required to be vacuum carbon deoxidized, the silicon content shall be 0.12% maximum.

Tensile Properties at Room Temperature

Tensile Strength
ksi [MPa]
70~95
[485~655]
Yield Strength
min. ksi [MPa]
37.5
[260]
Elongation
min. % in 2"
30
Reduction of Area
min. %
35
*All values are applicable to both ASTM A350 LF3 Class 1 and Class 2.

Charpy V-Notch Impact Test

Flanges made from ASTM A350 LF3 Class 1 or Class 2 shall take the Charpy V-notch impact test at a standard testing temperature of -150°F [-101°C]. The specimens shall be prepared in three pieces in size of 10 by 10 mm with the same heat number of the flange. The minimum impact energy required for average of each set of three specimens shall be 15 ft*lbf [20 J] for Class 1 and 20 ft*lbf [27 J] for Class 2; The minimum impact energy required for each one specimen only is 12 ft*lbf [16J] for Class 1 and 15 ft*lbf [20 J] for Class 2.

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