Difference between ASTM GrB7 & ASTM GrB7M STUDS 1

[SmallInfo]

Hi experts,
Again coming with an other query, when should we use ASTM GrB7 and B7M, as far as I know the basic difference is B7M is of low tensile and yield strength, but I am confused if there are other differences as well? we have temperature between 350C-400C
Thanks

 

[XL83NL]

In short, how I remember the difference: M is for sour service. There's more to it though, explained here

https://www.hunker.com/13415083/what-are-the-different-grades-of-bolts

https://www.portlandbolt.com/technical/faqs/astm-a193-grade-b7-vs-a193-grade-b7m/

https://www.eng-tips.com/viewthread.cfm?qid=163024

https://www.eng-tips.com/viewthread.cfm?qid=244575

https://www.eng-tips.com/viewthread.cfm?qid=297603

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

 

[SmallInfo]

XL83NL Thanks for all the links, it really helped.