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HOW DOES ASTM A574 COMPARE TO B7?

thread177-128159

HOW DOES ASTM A574 COMPARE TO B7?

HOW DOES ASTM A574 COMPARE TO B7?

(OP)
Can anyone tell me how A574 compares to B7 with regard to high  temperature applications? My situation is that a B7 Socket Head Cap Screw (3/4"-10 X 3") was sheared during removal. Our vendor does not have any of these in B7, but assures me that A574 will perform just as well under my high temperature application. I can see that the A574 has higher Tensile Strength, Yield, And Hardness qualities, but I am still concerned about the temperature, which is nominal 800 Deg F. I have not been able to find any data to support the supposition that A574 will perform at this temperature range.

TIA

RE: HOW DOES ASTM A574 COMPARE TO B7?

Yes, there are differences in allowable stress values. Your source for information is ASME B&PV Code, Section II, Table 3  - Maximum Allowable Stress Values for Bolting Materials.

The SA-574 AISI 4140 material is limited to 550 deg F. The SA 193 Grade B7 is suitable for a maximum service temp of 1000 deg F.

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