CruWear question

[Joseph Bandeko]

Hello,
Thinking about giving CPM CruWear a try and was wondering if it likes to warp in heat treat?
I will be doing 100% of the grinding pre-heat treat so I want at little warp as possible. I've tried doing this with CPM 3V and it worked great, so I guess how does it compare to 3V?

 

[HSC ///]

The details matter… how long of a blade? How thick of a spine?

I wouldn’t say it likes to warp, but you should expect some and straightening is part of the process.

For example, when I do kitchen knives in Cru wear, with a hidden tang , guaranteed theres going to be some bending at the heel tang junction

A carbide hammer works great for straightening.

I don’t know how it compares to 3V

 

[Scaniaman]

It's an average warper. I heat treat profiled blanks and use cryo

 

[Joseph Bandeko]

Perhaps I should just stick with 3V for now?

 

[Lorien]

in my limited experience, quenching in LN2 is a significant factor wrt warping in general. Personally, I don't think Cruwear NEEDS cryo, and have had good results throwing it in the freezer instead

 

[Joseph Bandeko]

in my limited experience, quenching in LN2 is a significant factor wrt warping in general. Personally, I don't think Cruwear NEEDS cryo, and have had good results throwing it in the freezer instead

I've been using dry ice with good results.

 

[Lorien]

I've been using dry ice with good results.

then warping might not be as much an issue. I like cruwear, you should try it. Even without cold treatment, it's good stuff

 

[TheEdge01]

in my limited experience, quenching in LN2 is a significant factor wrt warping in general. Personally, I don't think Cruwear NEEDS cryo, and have had good results throwing it in the freezer instead

What’s your austenizing and tempering temps???

 

[Lorien]

What’s your austenizing and tempering temps???

depends on the application, but always in the normal range. Tempering is in the low range, not the +/-1000f range

 

[Blankblank]

Generally speaking. In my experience, just doing a plate quench, and grinding in the bevels after hardening pretty much avoids warping on pretty much anything.

I've seen plenty of people complain about aebl warping. But i just did a prequench, then final austenitize and plate quench, then cryo. It came out like everything else.

If you plan to do a lot of the grinding before hand, especially something like a distal taper. Then its kind of up in the air.

 

[Seedy Lot]

I have used a decent amount of Cruwear and don't find it any more or less warp prone then other PM steels but I have occasionally experienced wrapping with all steels. If you are concerned about potential of warp run a stress releaving cycle of 1200F for 2 hours before heat treat.