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Flanges Made from ASTM A537 Class1 Plates

Blind flange with RF, ASME B16.47 Series A 150LB, material: ASTM A537 Class 1.

  • Description

Standards & flange types

StandardsTypes
ASME B16.5Blind Flange,
Reducing Flange without hub,
S/O Plate
ASME B16.47Blind Flange,
Reducing Flange without hub,
S/O Plate
ASME B16.48Figure-8 blank,
Paddle blank,
Paddle Spacer
*Flange types available made from ASTM A537 Cl.1 plates.

A series of pipe flanges can be manufactured from ASTM A537 Class 1 plates covering blind flanges, line blanks, slip-on plate flanges, and reducing flanges without hub. The ASTM A537 Class 1 plates refer to normalized C-Mn-Si steel pressure vessel plates intended for fusion welded pressure vessels and structures. The flanges may be manufactured in accordance with ASME B16.5, ASME B16.47, or ASME B16.48.

Pressure-Temperature ratings

ASTM A537 Class 1 steel is listed in material group 1.1 and it has the same pressure-temperature ratings as that of ASTM A350 Gr. LF2 and ASTM A516 Gr.70, etc.

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: Pressure-temperature ratings for flanges made from ASTM A537 Class 1, Class 75 ~ Class 400, in metric units.

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: Pressure-temperature ratings for flanges made from ASTM A537 Class 1, Class 600 ~ Class 2500, in metric units.

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: Pressure-temperature ratings for flanges made from ASTM A537 Class 1, Class 75 ~ Class 400, in US customary units.

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: Pressure-temperature ratings for flanges made from ASTM A537 Class 1, Class 600 ~ Class 2500, in US customary units.

Chemical composition requirements

ASTM A537 Class 1
ElementComposition
Cmax0.24
Mn*H.A.
t≤1-1/2"
0.70-1.35
*P.A.
t≤1-1/2"
0.64-1.46
*H.A.
t>1-1/2"
1.00-1.60
*P.A.
t>1-1/2"
0.92-1.72
Pmax0.025
Smax0.025
Si*H.A.0.15–0.50
*P.A.0.13–0.55
Cu*H.A. max0.35
*P.A. max0.38
Ni*H.A. max0.25
*P.A. max0.28
Cr*H.A. max0.25
*P.A. max0.29
Mo*H.A. max0.08
*P.A. max0.09
*H.A.: heat analysis; *P.A.: product analysis; *t: flange/ plate thickness.

Mechanical requirements

ASTM A537Class 1
*T.S.
ksi
[MPa]
t≤2-1/2"70-90
[485-620]
2-1/2"<t≤4"65-85
[450-585]
4"<t≤6"A
*Y.S.
ksi
[MPa]
t≤2-1/2"≥50
[≥345]
2-1/2"<t≤4"≥45
[≥310]
4"<t≤6"A
*EL. 2"
min. %
2"-
4"≤t<2"22
t>4"A
*EL. 8"
min. %
[200mm]18
*Mechanical requirements for ASTM A537 Class 1 flanges are thickness-dependent.

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