Originally Posted by Nick Hulme
Hot blueing chemically changes the surface layer of the steel to the same composition as haematite, it's harder than the steel and is porous allowing it to absorb and hold oil.
Cold processes do not produce a coating of the same composition or wear resistance.
Which brings up some interesting questions:
1. Does anybody know of a good web site that covers hot bluing processes from the hobbyist level?
2. Same question for color case hardening especially as an alternative to bluing.
3. Has any one tried the Cerakote type ceramic finishes for use on shop tools? I see potential here as an alternative to bluing but have no experience with respect to durability when handled in this environment.
I ask because i have some tooling bits and pieces id like to blue and was going to go with a kit from Caswell. In the back of my mind though there is this concern that the cold processes aren't as durable as the processes they replace.
In a nut shell looking for a durable but not too complicated way to finish steel parts. Especially parts that will be handled a lot.