I've been asked to quote a job in D2, but have no experience of heat treatment, other than chisels in a forge !
The job is a round collet, 3.5" dia, 3/4" thick, with a bore of 0.375" Close tolerance. The piece is then cut into 4 segments, then heat treated. It's used to hold the tube on a hydraulic tube bender.
I'm good with turning, and I thought I'd ream the bore, then cut segments on a band saw.
I have access to an electric furnace, but no vacuum, or controlled atmosphere.
So, from what I've read:
- wrap in SS foil
- heat to 1400 f and soak for 1 hour or so.
- heat to 1800 f and soak for 1 hour.
- remove from oven, leave in foil to cool in air, with some movement, down to 150 f.
- temper - not clear on the best approach.
I'm thinking to clean the job up after heat treating, media blast, and call it good.
If I have to grind the segments after heat treatment it'll need a fixture plate made for the grinder.
I'll discuss this approach with customer beforehand, to make sure he's good.
What do I need for tempering please ?
Bob