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The Newbies Arena Are you new to knife making? Here is all the help you will need. |
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#1
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1095 warped. searched archive.
I just finished HT and Tempering 4 blades.
The blades are 1/8" 1095,about 1" wide The 2 blades in question are 7 1/2 oal and warped about 0.125" at the tip and the warp starts about 3 inches from the tip. I am not looking for the answer as to why they warped. I feel silly not looking closer to see if it was before or after HT or temper. A search of the archives gives a lot of hits,but not a direct answer. My question is,with 1095 after HT and 2 cycles of 400 degrees for 2 hours, can I straighten this warp by cold bending ? If knives should bend and not break then I believe that I should be able to cold bend it straight. The cost of the steel is negligible,but I would like to save some of my time that I have in them. Question #2. I am looking for a little harder blade,for kitchen use. What temper temperature do you use for blades that you are not intending to torture by bending them ? Thanks Mike Last edited by rabbit_skinner; 10-03-2003 at 08:37 PM. |
#2
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Mike , sorry to hear about that, but it is not that uncommon,especially for newbies. Most of us have warped more than we care to admit. If it was me I would reheat and anneal the blade then straighten it, then try again. The results usually come out better.
On kitchen knives, I heat treat the exact same as I would all others. Good luck ,my friend,Dave |
#3
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#1 No, cold bending will almost surely break the blade, especially if it wasn't differentially hardened. Been there, done that. If it was differentially hardened you can usually do some cold straighteneing but the tip is not going to take much. Even though you didn't ask, the warp was probably caused during the quench, possibly the result of an uneven grind.
#2 Time to experiment. If 400 F is too soft you suit you, then try 300 F. If that's too hard, put the blade back in the oven at 350 F and soften it a little.... |
#4
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Re: 1095 warped. searched archive.
Quote:
Quench and look to see if the blade is warped... IF it is warped I put on some oven mits.. (I have some asbetos mits for high temp) and IMMEDIATELY place the HOT knife in a vise and slightly give pressure to the warp spot. This will almost always straighten it out. IF you wait until the blade is cold.. it's toooooo late.. you'll snap it. Unless you reheat it.. and anneal it. I've got a bucket with a few snapped blades to prove it. |
#5
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Thanks Dave,Ray and Fsawyer.
I will anneal,straighten,re-HT and be more aware next time. After HT and Temper is it normally difficult to file or is my 400 degree oven colder than expected? I can currently file better than I can grind,so I was going to use a file to finish 'grinding' after HT. I am going to eventually get a multimeter with a thermocouple to check the oven,but the wife believes that it is close,judging by her cooking times. Thanks again for your help. Mike |
#6
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Results can vary for a lot of reasons but I would guesstimate that a 400 F temper would give you somewhere around a Rc 58 and that would be pretty difficult to file. You may find that making 1095 any harder than that will make your edge too brittle even for a kitchen knife.
Kitchen ovens are notorious for being inaccurate so yours could easily be off. although it might not be off by much. That's why we always say there is no substitute for experimenting to see what gives the best results ..... |
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blade, knife, knives |
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