stress relieving brass
stress relieving brass
(OP)
In summary, a C37700 alloy threaded plumbing component failed in service due to definite evidence of a combination of SCC and dezincification. Metallurgical examination did not indicate any abnormalities in the microstructure; it was characteristic for free machining α-β brass, forged and cold-worked (drawn). I would appreciate any comments on how one can determine if the brass component was stress-relieved since this procedure it is usually done at a temperature below the recrystallization temperature and as such, it has little or no effect on the microstructure.





RE: stress relieving brass
RE: stress relieving brass
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Plymouth Tube
RE: stress relieving brass
The stress relieving temperature for C37700 is 500F or 260C. The recystallisation temperature of copper alloys is influence by cold working, so a temperature of 260 C is almost certainly going to cause structural changes in the alloy. Do a hardness survey on a cross section and if there is a lot of variation in hardness it will almost certainly not been stress relieved after machining. It is common practice in China not to do stress relieving treatment on plumbing fittings after machining as the alloy is normally supplied in bar which have been stress relieved and the Chinese believe that no further treatment after machining is necessary. They is a famous quote by Confucius. "The people may be made to follow a path of action, but they may not be made to understand it".
RE: stress relieving brass
RE: stress relieving brass