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Design Stress Values (KSI) VS Temperature

 
SPEC GRADE TEMPERATURE deg F (deg C)
    650 700 750 800 850 900 950 1000 1050 1100
    343 371 399 427 454 482 510 538 566 593
ASTM A193 B6 21.2 21.2 21.2 19.5 15.6 12        
ASTM A193 B7(*)                    
ASTM A193 B7M 25 25 23.6 21 17 12.5 8.5 4.5    
ASTM A193 (*) 20 20 20 18.5 16.2 12.5 8.5 4.5    
ASTM A193 B8-CL1 11.2 11 10.8 10.5 10.3 10.1 9.9      
ASTM A193 B8-CL2 25                  
ASTM A193 (* *) 25 25 25 25 23.5 20.5 16 11 6.3 2.8
ASTM A193 B16                    
ASTM A320 L7 25 25                
BS B17B 20 19.8 19.8 19.8 19.7 19.7 19.6 19.4 19.3 16.6
ASTM 453 660 20.2 20.1 20 19.9 19.9 19.9 19.8 19.8    

(*) 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.
(**) FOR BOLT DIAMETERS < 3/4"

 

Recommended Working Temperatures of Bolt Materials

 
MATERIAL TEMPERATURE °C ( °F )
  MIN. MAX.
CARBON STEEL -29 (-20) 300 (572)
B7, L7 -73 (-100) 400 (752)
B6 0 (32) 500 (932)
B8 -200 (-325) 575 (1067)
B16 0 (32) 520 (968)
B17B -29 (-20) 650 (1202)
INC 718 0 (32) 750 (1382)
660 -29 (20) 538 (1000)

Chart

 

ASTM A – 194 “Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High-Pressure and High-Temperature Service”

 
Identification AISI Type Outstanding Chemical
Ferritic
L-7 4140-4142-4145 Chromium-Moylbdenum
L-7M 4140-4142-4145 Chromium-Moylbdenum
L-7A 4037 Carbon-Moylbdenum
L-7B 4137 Chromium-Moylbdenum
L-7C 8740 Nickel-Chromium-Moylbdenum
L-43 4340 Nickel-Chromium-Moylbdenum
Austenitic
B8, B8A 304 Unstabilized 18 Chromium-8 Nickel
B8-C, B8CA 347 Stabilized 18 Chromium-8 Nickel
B-8M, BBMA 316 18 Chromium-10-Nickel-2 Molybdenum
B-8T, B8TA 321 Stabilized 18 Chromium-8 Nickel
B-8F, B8FA 303 Free Machining 18 Chromium-8 Nickel

The Ferritic Steel Grades L7 and L7M together with the Austenitic Grades B8 and B8M are normally stocked for immediate shipment, with the other Grades available on special order. Grade L7 is normally used to -50°F without a Charpy Test and to -150°F with a Charpy Test. Grade L7M is normally used in H2S service with a required Charpy Test at -100°F. All of the Austenitic steels listed above may be used to -325°F without a Charpy Impact Test and at lower temperatures with the requisite Impact Tests.

 

ASTM A – 320 “Standard Specification for Alloy-Steel and Stainless-Steel Bolting Materials for Low-Temperature Service”

 
Identification AISI Type Outstanding Chemical
Ferritic
2-HM   Carbon
2-H   Carbon
4   Carbon-Moylbdenum
3 501 5% Chromium
6 410 12% Chromium
6-F 416 12% Chromium
7 4140-4142-4145 Chromium-Moylbdenum
Austenitic
8 304 18 Chromium-8 Nickel
8-C 347 18 Chromium-8 Nickel
8-M 316 18 Chromium-10-Nickel-2 Molybdenum
8-T 321 18 Chromium-8 Nickel
8-F 303 18 Chromium-8 Nickel
8-P 305 18 Chromium-10 Nickel

Dan-Loc Group stocks the Ferritic steel nuts in Grades 2H, 2HM, 7, L7, and L7M which are normally used in conjunction with Grade B7, B7M, B16, L7 and L7M studs. The Austenitic steel nuts, Grade 8 and 8M are also available from stock for use on stainless steel studs and bolts. Dan-Loc Group stocks heavy pattern hex nuts in the grades listed above to the dimensional requirements of ANSI B18.22.1. Unless otherwise specified, these nuts are tapped UNC-2B in sizes 1” and under, and 8UN-2B over 1” diameter. All other grades of nuts listed may require special order.