17-7 SS discoloration
17-7 SS discoloration
(OP)
hello everyone.
I have surgical parts that are 17-7 SS (.050 thick)annealed that were heat treated per RH 950 to RC 45 min, but they were not heat treated in a vacuum atmosphere as directed so they are discolored. Our in-house cleaning methods will not work. Is a bright dip a good recommendation? and if not please advise other recommendations...thanks for your help.
Aubry
I have surgical parts that are 17-7 SS (.050 thick)annealed that were heat treated per RH 950 to RC 45 min, but they were not heat treated in a vacuum atmosphere as directed so they are discolored. Our in-house cleaning methods will not work. Is a bright dip a good recommendation? and if not please advise other recommendations...thanks for your help.
Aubry





RE: 17-7 SS discoloration
http://www.surtec.com/TB/TB08E.pdf
RE: 17-7 SS discoloration
RE: 17-7 SS discoloration
In the section about using HNO3/HF the following statement is very important as a means to shorten the process.
"Removal of loosened scale may be facilitated by the use of high-pressure water or steam spray." This has to be done before the parts dry down.
We make a lot of PH SS parts every year and our procedure for processing after machining is Vapor degrease, harden, and acid pickle with HNO3/HF. The immersion time we use is around 10-15 seconds and use a steam spray to knock the loosened scale off. After we throughly rinse in pure water and dry down.
Look at the 17/7 Data Bulliten
http://w
RE: 17-7 SS discoloration