Page 52 - Design Criteria.qxd

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Bolting Data
Design Stress Values (ksi) vs Temperature
TEMPERATURE °C/°F
SPEC GRADE
345/650 370/700 400/750 425/800 455/850 480/900 510/950 540/1000 565/1050 595/1100
B6 21.2 21.2 21.2 19.6 15.6 12.0
B7 * 25.0 25.0 23.6 21.0 17.0 12.5 8.5 4.5
ASTM
A193 B7M * 20.0 20.0 20.0 18.5 16.2 12.5 8.5 4.5
B8-CL1 11.2 11.0 10.8 10.5 10.3 10.1 9.9 9.7 9.5
B16 25.0 25.0 25.0 25.0 23.5 20.5 16.0 11.0 6.3 2.8
ASTM L7 20.0 20.0 20.0 20.0 16.2 12.5 8.5 4.5
A320
ASTM 660 20.2 20.1 20.0 19.9 19.9 19.9 19.8 19.8
A453
TEMPERATURE °C/°F
MATERIAL
MIN. MAX.
Carbon Steel -30/-20 300/570
B7 -30/-20 400/750
L7 -100/-150 400/750
B6 -30/-20 510/950
B8 -200/-325 580/1075
B16 -30/-20 525/975
B17/660 -30/-20 650/1200
B80A -250/-420 760/1400
Inconel 625 -250/-420 815/1500
Inconel 718 -250/-420 760/1400
* For Bolt Diameters = 2-1/2”
Please note that the above values are for reference purposes only. Values should be extracted from ASME or BS 5500.
Recommended Working Temperatures
of Bolt Materials
Stress Retention Properties
of Bolt Materials
Stress relaxation behavior of various bolting materials showing
percentage of initial stress retained at temperature
100
75
50
25
0
100 200 300 400 500 600 700
Carbon Steel
B7
B8M
B16
B80A
B17/660
B8
0
Temperature °C
Residual Stress (% of initial s
tress)
800