warped heat treat

T

TJ Smith

Joined
Sep 17, 1999
Messages
863
440c warped

Just got my 440c filet knife back from Texas Knife makers. WARPED wtf.
Has anybody had any trouble with them? Wasn't warped when I sent it.
Can a warp be straightened out without breaking And losing hardening.
Any help
TJ Smith
 
If it was carbon steel i would just clamp it against a piece of angle iron and retemper it but stainless i would call them and see if they will fix it.
 
If able, build some bending jigs to get out large warps. in the absence of such jigs, a short piece of angle iron, a couple of small C clamps, and some nails serve quite well, and can be particularly helpful from removing warped blade tips. Clamp it up and bend it to about the opposite deflection that it is currently at. Place it in your home oven to the desired temper temperature. Leave it for a couple of hours, cool it off and remove the clamps. Repeat as necessary. If you have a large warp, clamp lightly to start, and tighten down once the piece has been brought to temperature.

Be patient with it.
 
A thin fillet blade is so easy to wrap - While they should have caught the wrap and included a note, *hit happens.

As other's have said, clamp and heat staying below tempering temp.
 
Use a bead blaster and blast the concave side where the warp is. Go slow and check your progress. This is the easiest way I've found to straighten warps.
 
Was the edge bevels ground befor heat treating. On thin knives I grind the edge bevels after heat treating. If all you have is a file then that won't happen.
 
What was the thickness of the blade at the time of HT? Peters says anything under .020" and you risk warpage but I like to stay above that to be safe. Was it normalized? Thin knives are so easily warped. Unfortunately, its part of the business.
 
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