SLIP JOINT Heat Treat ????

T

TRACY LAROCK

Joined
Jul 31, 2014
Messages
5
Hello all,

I have completed 5 slip joints using 3/32 pg O-1, HT done in Even Heat 10 min soak at 1490, 2 2hr tempers at 500 for Blade and 840 for spring. Blades seem to perform well, spring action is good. I am checking to see if these numbers are close to what others are using.

I am interested in using ats-34 or 154 cm, ( any source for PG on these steels?) and have been unable to determine what others are using for temps on the spring temper, i would appreciate any help.

Thanks
 
Tracy...you're saying you have done some already, your own heat treat, and you're just wondering if those numbers are what everyone else is using? Just trying to clarify so we can give you the best response. Your numbers look good....not having experience with springs and the proper temper for such....the tempering temperature you mentioned for knives (500F) seems high. I think a 400F or 420F might be better for knives. 500F would make a very tough knife....but at the expense of edge holding...which O1 really shines in that category when tempered for it. I would suggest lowering the tempering temp of knives from 500F to 420F and see how that works for you. But don't change anything if you have hit what you were aiming for!
 
Your temper temp on the blades seem high. I temper at 400 F and get Rc60 on O-1. Spring temper is right on I temper at 820F and get Rc48 on my springs.
For spring temper on 154cm I use 1125F and get Rc 48. Austinize at 1990.

Stan
 
On ats-34 I"m about 10 degrees higher than Stan for that 48ish
Rc on springs, so like 1135-1145. If you have a way to check-- a
spring in that 47-49Rc range should be right on.
Ken.
 
Funny I am in the process of building a slip joint and was wondering what temp to use for back spring
 
If doing your own HT, and you have a Rockwell tester, the process is pretty simple. Just do a few test and zero in on the exact tempering spot. If sending the stainless blades and springs out for HT, give the Hter the hardness desired for the blades and the springs. For the blades Rc58-60 is good, and the springs at Rc48. They will know what to do from there.
 
Email Jared Oeser about his heat treatment of O1. He runs his knives hard because O1 loses very little toughness ran at high hardness. He's a nice guy and makes a heck of a slip joint too.
 
Thanks all for the responses

Heat treat is done in shop with evenheat oven

I had downloaded a chart that showed 500 degrees giving a 60 rc for o1
I do not currently have access to a tester. Glad the spring temper is on.

I will try 400 on a test blade and as I understand can "work my way up" if I have any chipping.

These have been of fun and I look forward to making more.


Thanks
 
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