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rolland
01-07-2010, 09:32 PM
Has anyone worked with cold finished 4140 and de-carb free 4140 annealed . I am interested in what the difference is in machining if there is a difference

smalltime
01-07-2010, 09:48 PM
If you are talking about tooling plate: I have worked with it a bunch. Reduce cutting speed, and feeds you should be OK. It will work harden pretty easily.

Also, NO OIL

motorworks
01-07-2010, 09:52 PM
Hi
I use 4140-HTSR in the shop.
Never tried the 2 you spoke of.
That said, the HTSR ie Heat Treated Stress Relived
is not something for the faint of heart
Requires HP and Carbide tooling, but oh those 6 and 9 chips are nice :)

If you need quality bar why not use C1144 - Stressproof
Very easy to machine and very nice finish. Bloody strong as well
100,000 psi D)
e

rolland
01-07-2010, 10:27 PM
I will need 2 1/2 square bar for the project and apparently 1144 does not come in anything other than round.

MTNGUN
01-07-2010, 11:49 PM
Has anyone worked with cold finished 4140 and de-carb free 4140 annealed . I am interested in what the difference is in machining if there is a difference
I use a lot of cold rolled (but not heat treated) 4140 bar. It's not a joy to work with, produces sharp slivers. But, before I used 4140, I used 0-1 bar (not heat treated) and 4140 is a little easier to machine than 0-1, in my experience (the advertised machinabilty rating may or may not agree with my experience).