Question for Mete

Kit Carson

Kit Carson

Joined
Oct 6, 1998
Messages
2,300
I'm making a full set of choke tubes using 4130. I don't have it listed in my book but best I remember, 1600° x 30 minutes, oil quench, 750° x 2 hrs. Shooting for a Rc 36 or so. Does that sound right?
Any advantage to a double temper?
 
UH, I thought he ment choke tubes for us when we get out of line and 36 seemed awful hard to me :eek: :confused:
 
Not an issue anymore. We decided to go with 6Al4V titanium :)
Jody, my son is making them for his SKB. He works for a large gun manufacturing company at their R&D division.
I'll get a picture when they are finished.

Don,
Yes, 36-38 Rc is pretty much the standard, if not a little higher than some.
 
4130 is what Ruger uses for most of their gun parts IIRC and also 4140.Very nice alloys. 36 HRcgives you about 170,000 psi tensile that's fine. But titanium ? is there anything that isn't made of titanium today ?
 
My memory is getting bad Kit. It's been years since I made any so I went back to my notes. I used pre heat treated 4140 and the factory specs showed RC 27-30.

I made a stripper choke to put on an almost smooth bored 44 mag once. It was designed to break up shot cups that encircled the inside of cylinder length cases made from 44 max.

I heat treated it in the mid 40's and it is still holding up.
 
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