SA516-Gr.70的材料，36mm，封头时热冲压成型，终压温度920摄氏度，成型后，这个封....

Hot forming heads, PFHT necessary?
thread292-447220

ElCidCampeador (Mechanical)(OP)11 Dec 18 07:53
Hi,
I have an ellipsoidal head (Mat. SA 516 GR.70, D.I.1000 Thk.60mm) that has to be welded to a pressure vessel designed acc.to ASME VIII Div.1.
The vessel is impact tested acc. to UCS 66.

The supplier of head will hot press @ 920°C the head without PFHT of normalization.
Acc. to ASME I need to do a welding test coupon and have PQR with impact test.
Do you think it's necessary a PFHT of normalization for the head? (N.B: Vessel will take PWHT per ASME later, but I know that PWHT and PFHT are not the same)

Vessel is impact tested, the fact that normalization could change curves in figure UCS-66 doesn't change the mandatory request of a test coupon (which is required in any case), so why doing a PFHT which will increase costs?

This is my idea, I wait your opinions. Thanks.


david339933 (Industrial)11 Dec 18 16:57
PFHT is required when heads are cold formed...your head is hot formed. PFHT is not required.

PWHT and PFHT are essentially the same thing, if the governing thickness is considered to be the full thickness of the plate.

FROM:
https://www.eng-tips.com/viewthread.cfm?qid=447220
仅供参考。个人觉得不一定对。

SA516-Gr.70的材料，36mm，封头时热冲压成型，终压温度920摄氏度，成型后，这个封........................................

你的问题是什么？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？

SA516-Gr.70的材料，36mm，封头时热冲压成型，终压温度920摄氏度，成型后，按照ASME规范，这个封头还需要做正火处理吗？在哪里有规定？

https://www.eng-tips.com/viewthread.cfm?qid=325888
另一个帖子，FYI

mikeheseri 发表于 2019-1-24 12:57
https://www.eng-tips.com/viewthread.cfm?qid=325888
另一个帖子，FYI

从你分享的帖子来看，你确实是个行家