UG-85(b)
UG-85(b)
(OP)
Dear respected experts,
I would like to have an inquiry regarding the definition of heat treatment as per UG-85(b) of ASME BPVC Sec VIII Division 1. As per UG-85(b). Heat treatment for carbon and alloy steel is considered as thermal treatment exceeding 480°C. I'm just curious where this do ASME derived this 480°C. Is this the lower critical transformation temperature for carbon and low alloy steel.
Hoping for someone will clarify.
Thank you and good day.
I would like to have an inquiry regarding the definition of heat treatment as per UG-85(b) of ASME BPVC Sec VIII Division 1. As per UG-85(b). Heat treatment for carbon and alloy steel is considered as thermal treatment exceeding 480°C. I'm just curious where this do ASME derived this 480°C. Is this the lower critical transformation temperature for carbon and low alloy steel.
Hoping for someone will clarify.
Thank you and good day.





RE: UG-85(b)
Regards
r6155
RE: UG-85(b)
the requirement of UG-85(b)is specified that when the impact test is required by ASME viii-1,the heat treatment of test coupon plates must be same with the plates which will be fabricated the produces. this heat treatment condition indicates the finial deliver condition,including hot rolling (control rolling), Normalizing, quench+temper.
This issue has been discussed many times in the ASME code thread of this forum,you can search the topic in the forum, and the ASME commission given a very clear interpretation in earlier year. you can find it in the web.
RE: UG-85(b)
RE: UG-85(b)
RE: UG-85(b)
RE: UG-85(b)
In my opinion, the 900degF (480degC) pertains to the minimum temperature where heat treatment takes place (e.g. applicable to Aging treatment/Precipitation Hardening) on a material. The Code 'maybe' simply specify it to consider not only the common heat treatment range-from 1100degF (595degC).
Ciao!