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Fiber Elongation and PWHT

Fiber Elongation and PWHT

Fiber Elongation and PWHT

(OP)
This will probably be an easy one for most of you here, but I'm stuck so here goes:

I've got a Carbon Steel Vessel 5/8" thk. shell and 1/2" thk. 2:1 heads that are Cold Formed.

I'm getting a "fiber elongation exceeds 5%" warning and I'm wondering if I must heat treat the ENTIRE vessel?

If I must heat treat, can't I just heat the heads? If I would've gotten the heads "HOT Formed" I wouldn't be worried about this,
so what is the difference if I just do a quick heat treat of the heads?

Thanks in Advance
JW

RE: Fiber Elongation and PWHT

You shall read UCS-79(d) carefully. If your heads are P 1, groups 1 or 2, the extreme fiber elongation can as large as 40%, OR 5% maximum IF any of the five conditions listed in UCS-79(d) exists.

If at the end you find that you shall heat treat the heads then they shall be heat treated following the rules of UCS-56. Read also interpretations VIII-1-83-105 and VIII-1-95-50.

Hope this helps.

RE: Fiber Elongation and PWHT

Check your process for welding heat-treat as well.

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