doing PWHT on material not requiring it by code
doing PWHT on material not requiring it by code
(OP)
Hi, greetings!
Is there any problem if WPS requiring PWHT (say 2hrs @720degC) is used for metal of lesser thickness(say 8mm -not rquiring PWHT)for P4 material. Is there any requirement of minimum value of hardness -will long pwht on small thckness affect its UTS or any other property.
Thanks
Is there any problem if WPS requiring PWHT (say 2hrs @720degC) is used for metal of lesser thickness(say 8mm -not rquiring PWHT)for P4 material. Is there any requirement of minimum value of hardness -will long pwht on small thckness affect its UTS or any other property.
Thanks





RE: doing PWHT on material not requiring it by code
Normally there is no problem with PWHT on thinner sections and you can call it a stress relief treatment. A PWHT is done on equipment that will see service in an environment that can cause SCC regardless of thickness.a
RE: doing PWHT on material not requiring it by code
The material is A335P11(P No 4). I think the PWHT temp 720 is OK as per code.Also, is there any minimum hardness and max pwht time specified any where after PWHT? Only minimum soaking time and max hardness are seen specified.
RE: doing PWHT on material not requiring it by code
RE: doing PWHT on material not requiring it by code
RE: doing PWHT on material not requiring it by code
It clears my doubt which I was pondering for some time.