View Single Post
  #2  
Old 12-09-2019, 06:44 PM
jimmontg jimmontg is offline
Guru
 
Join Date: Jan 2016
Location: Now live in Las Cruces NM.
Posts: 1,345
I was appointed the heat treater at a machine shop because I made knives (really, no other reason), but had only ever used O1, D2 and 440C. They had a product for coating carbon steels mostly is what I was told. Apparently the ATP-641 doesn't hold up to long high temp soak times very well. I tried it on a piece of 440C at 1900 degrees and it cracked and it didn't look very good at all on the test piece. Worked great for O1, but not stainless or even A2. I had to use it for machined parts I couldn't wrap and the results were mixed until I set our oven up to take an argon atmosphere. The machinists worried about some of their parts or we sent the parts out, but on some parts some pitting was allowed as cosmetics were not important.

Believe me, if there was a coating material that consistently worked well for stainless heat treaters would be using it instead of the foil wrap which is expensive and labor intensive.
Reply With Quote