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Rifles, Reloading, Optics, Equipment
Gunsmithing
Bronzing steel?
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<blockquote data-quote="shortgrass" data-source="post: 1023387" data-attributes="member: 24284"><p>No linseed oil and charcoal. That's "charcoal bluing",, I think. CCH requires the part to be in the annealed state. If it's already hardened it needs to be annealed, otherwise it may stress crack. After annealing, the part is polished and then 'packed' in a crucible with bone or wood charcoal or a combination or both (it's up the guy doing the work). The crucible, with the part and charcoal in it are then heated in a heat treat oven. The temp must be above 1333 deg. F before quenching for hardening to actually take place on low carbon steel. The hotter the part, the higher the hardness. The colors associated with CCH are just a by product of the hardening process. I built my crucibles out of 4"x4"x 3/16" wall steel tubing. Welded a bottom on and built a good fitting but easily removable lid. I knock the lid off at the quenching tank and quickly dump the contents of the crucible into the tank. I have a screen type catch basket for easy removal of the part(s). Hardness and color are entirely dependent on the steel and the charcoal it is packed in. There are/were as many different methods used in the past as there were shops that did the process. As for the ammonium nitrate, yes its a common fertilized but was also part of the 'blend' that Tim McVay (sic) used to blow-up the Fed. building in OKC back in the late 90's. Since then it's been strictly controlled.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1023387, member: 24284"] No linseed oil and charcoal. That's "charcoal bluing",, I think. CCH requires the part to be in the annealed state. If it's already hardened it needs to be annealed, otherwise it may stress crack. After annealing, the part is polished and then 'packed' in a crucible with bone or wood charcoal or a combination or both (it's up the guy doing the work). The crucible, with the part and charcoal in it are then heated in a heat treat oven. The temp must be above 1333 deg. F before quenching for hardening to actually take place on low carbon steel. The hotter the part, the higher the hardness. The colors associated with CCH are just a by product of the hardening process. I built my crucibles out of 4"x4"x 3/16" wall steel tubing. Welded a bottom on and built a good fitting but easily removable lid. I knock the lid off at the quenching tank and quickly dump the contents of the crucible into the tank. I have a screen type catch basket for easy removal of the part(s). Hardness and color are entirely dependent on the steel and the charcoal it is packed in. There are/were as many different methods used in the past as there were shops that did the process. As for the ammonium nitrate, yes its a common fertilized but was also part of the 'blend' that Tim McVay (sic) used to blow-up the Fed. building in OKC back in the late 90's. Since then it's been strictly controlled. [/QUOTE]
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Bronzing steel?
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