Go-to source for steel ttt diagrams?

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Pattonias
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I am working on a heat treatment plan, and I am curious if there is a go-to source for ttt diagrams for particular materials. I am working with SA-516 70, but it would be nice if there was one place where I could go to get current/reliable information. So far google searches have been unsuccessful.
 
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I don't quite understand .

Manufacturers and suppliers of metals generally provide all the information needed .

Have you any specific difficulty ?
 
Pattonias said:
I am working on a heat treatment plan, and I am curious if there is a go-to source for ttt diagrams for particular materials. I am working with SA-516 70, but it would be nice if there was one place where I could go to get current/reliable information. So far google searches have been unsuccessful.
What kind of heat treatment? Is it a post weld heat treatment?