Bolting for Cryogenic Service

[af09]

Are ASTM A193 B8M Class 1 (316 stainless steel) bolts rated for cryogenic service? I see some online resources stating a temperature range of -450 °F to +1500 °F. Is this accurate?

My concern is that the standard itself is titled "Bolting for High Temperature and High Pressure Service". Does this mean these bolts are not suitable for low temperature service for some reason? If so, what bolting material would be an appropriate alternative for cryogenic service?

 

[GBTorpenhow]

If you want to be technical about it the low temperature equivalent is A320, but there is no mechanical or chemical difference between A320 and A193 bolts of the same grade. Ordering A320 usually gets you an email from the vendor asking if the A193 equivalent is ok.

 

[af09]

If they're identical, what's the point of two different standards? Is there any difference between the two at all?

 

[GBTorpenhow]

A320 includes other low temperature grades than the ones that are common to A193.

https://www.portlandbolt.com/technical/specifications/astm-a320/

https://www.portlandbolt.com/technical/specifications/astm-a193/

 

[XL83NL]

If they're identical, what's the point of two different standards? Is there any difference between the two at all?

Have you read both standards to find out any differences? They’re not identical all the way. Try A320 ch. 6 vs A193 ch. 9.

Huub
- You never get what you expect, you only get what you inspect.

 

[WKTaylor]

FYI... more stuff...

ASTM A320 STANDARD SPECIFICATION FOR ALLOY-STEEL AND STAINLESS-STEEL BOLTING FOR LOW-TEMPERATURE SERVICE
ASTM A962 STANDARD SPECIFICATION FOR COMMON REQUIREMENTS FOR BOLTING INTENDED FOR USE AT ANY TEMPERATURE FROM CRYOGENIC TO THE CREEP RANGE

Regards, Wil Taylor
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