» Technical » ASTM A537 Class 1 Applied to ASME B31.3

ASTM A537 Class 1 Applied to ASME B31.3

June 12, 2020

Application & product forms in process piping

ASTM A537 Cl.1 plates

Pressure vessel plates, ASME A537 Class 1, 2.5 m x 1.2 m x 32 mm.

The ASTM A537 Class 1 steel plate with a thickness no greater than 64 mm [2-1/2″] can be applied to ASME B31.3 process piping. The plates shall be normalized with minimum yield strength and tensile strength of 50 ksi [345 MPa] and 70 ksi [485 MPa], respectively. The UNS designation of ASTM A537 Class 1 is K12437 and its P-Number is 1. The B31.3 Code has endorsed three other product forms equivalent to ASTM A537 Class 1 including ASTM A671 Gr. CD70 eletric-fusion-welded (EFW) steel pipes for atmospheric and lower temperatures, ASTM A672 Gr. D70 electric-fusion-welded (EFW) steel pipes for high-pressure service at moderate temperatures, and ASTM A691 Gr. CMSH-70 EFW steel pipes for high-pressure service at high temperatures.

Basic allowable stresses

*Temp.*S
Min. ~10023.3
20023.3
30022.8
40022.7
50022.7
60022.4
65021.9
70018.3
*S & Temp.: basic allowable stress, S, ksi, at metal temperature, °F.
*All tabulated stress values are basic allowable stresses in tension; allowable stresses in shear shall be 0.80 times the basic allowable stress in tension and allowable stress in bearing shall be 1.60 times that values; allowable stresses in compression shall be no greater than the basic allowable stresses in tension.
*All stress values are applicable to ASTM A537 Cl.1, ASTM A671 Gr. CD70, ASTM A672 Gr. D70, and ASTM A691 Gr. CMSH-70.

Maximum & minimum use temperatures

Curve-D

Figure-1: Curve-D for minimum temperatures without impact testing for ASTM A537 Cl.1; Note 1: impact testing is required for any design minimum temperature below -48°C [-55°F].

The maximum use temperature of ASTM A537 Class 1 steel is 371°C [700°F]. According to ASME B31.3, the minimum use temperature shall be determined by a minimum temperature-thickness curve, Curve D. As illustrated in Figure-1, the left vertical axis is design minimum temperature in °C while the right vertical axis is design minimum temperature in °F. The horizontal axis represents nominal thickness T, in mm unit. If a design minimum temperature-thickness combination is on or above the curve, impact testing may be exempted. The tabulated values for minimum temperatures without impact testing for ASTM A537 Class 1 material are presented in the table below.

T
mm
T
inch
Curve D
°C
Curve D
°F
6.40.25-48.3−55
7.90.3125-48.3−55
9.50.375-48.3−55
10.00.394-48.3−55
11.10.4375-48.3−55
12.70.5-48.3−55
14.30.5625−45.6−55
15.90.625−43.9-47
17.50.6875−41.7-43
19.10.75−40.0-40
20.60.8125−38.3-37
22.20.875−36.7-34
23.80.9375−35.6-32
25.41.0−34.4-30
27.01.0625−33.3-28
28.61.125−32.2-26
30.21.1875−30.6-23
31.81.25−29.4-21
33.31.3125−28.3-19
34.91.375−27.8-18
36.51.4375−26.7-16
38.11.5−25.6-14
39.71.5625−25.0-13
41.31.625−23.9-11
42.91.6875−23.3-10
44.51.75−22.2-8
46.01.8125−21.7-7
47.61.875−21.1-6
49.21.9375−20.6-5
50.82.0−20.6-4
52.42.0625−19.4-3
54.02.125−18.9-2
55.62.1875−18.3-1
57.22.25−17.80
58.72.3125−17.21
60.32.375−16.72
61.92.4375−16.13
63.52.5−15.64
65.12.5625−15.05
66.72.625−14.46
68.32.6875−13.97
69.92.75−13.38
71.42.8125−13.38
73.02.8125−12.89
74.62.9375−12.210
76.23.0−11.711
*All values are extracted from Table 323.2.2A of ASME B31.3; T: nominal thickness; Curve D: lowest exemption temperature.
*For blind flanges and blanks made from ASTM A537 Class 1, the T shall be 1/4 of the total thickness, where the total thickness is the thickness of the blind flange or blank including the thickness of the facing.

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