A-387-B - Equivalent Class? 2

[HRS713]

Hello everyone,

I have a 1970s built reactor with vessel material listed as A-387-B N&T. Is this material equivalent to today's A-387-12?

I appreciate the time in advance!

Edit: To clarify, I ask this because I've seen conflicting responses on different forums between A-387-11 and A-387-12 superseding A-387-B. So was just looking for some assistance confirming which current material spec applies.

 

[mrfailure]

I can give you a partial answer: yes,, they are equivalent but the current edition of the spec is actually ASTM A387-17a (i.e. it was issued in 2017). The material in your reactor was given a normalize and temper heat treatment. What I don't know is what the "B" denotes. What you need to know is the grade of chrome-moly steel (ASTM A387 has several), and the strength class (1 or 2) to know what you have.

 

[weldstan]

1 Cr -1/2 Mo

 

[mrfailure]

Stan, where does that come from? That is Grade 12 under the spec as currently written.

 

[weldstan]

Vol. 1 of the 1961 Metals Handbook.

 

[HRS713]

Thank you @mrfailure & @weldstan very much for the quick responses and help! Greatly appreciated!