Cold Service Carbon steel
Cold Service Carbon steel
(OP)
We are manufacturing carbon steel valves for -30°C (-22F)servce I am looking for a steel specification for tube and bar that will operate at these temperatures with a minimum of pre and post weld heat treatment.
At present we intend to make most the valve from SA516-70N.
Dave
At present we intend to make most the valve from SA516-70N.
Dave





RE: Cold Service Carbon steel
RE: Cold Service Carbon steel
RE: Cold Service Carbon steel
When the PWHT is not required, the DBTT (ductile-Brittle Transition Temperature) of welds may be decreased because it can reduce the residual stress. However ASME BPV codes do not mention the mitigation of impact test exemption curve due to the preheating because it is difficult to prove the quality of the final product by the preheating.
2. PWHT (per UCS-56)
ASME Section VIII Div.1, UCS-68(c) permits the mitigation of impact test exemption curve due to PWHT (when it is not otherwise a requirement of this division).
3. Normalizing
ASME Section VIII Div.1, Fig. UCS-66 permits the mitigation (more than PWHT’s) of impact test exemption curve due to normalizing.
Thomas Eun
RE: Cold Service Carbon steel
John
RE: Cold Service Carbon steel