warped Stainless steel blade

I have a friend who came to me on this & Im not shure about it because it has not happen to me. He has heattreated his 154-cm in oil, done the sub zero treatment,tempered twice at 2 hours ea. He is getting warped or bent blades.Question is He heated up the knife blanks with a torch just hot enough to bend them back straight then he puts them back in for at least one more temper. Is this suitable? Can he do this without damage to the blade? Won't this give him a "spot of red hardness "in a critical area that could lead to a break or weak spot? I watched him & He heats only the area around the bend the actual cutting edge is protected from any heat in the proccess,so is not an issue. Most bends are at the blade/handle junction.Your thoughts....

Tags: blades, stainless, steel, warped

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Permalink Reply by Shane Paul Atwood on December 15, 2010 at 1:36pm

I have a set of things I call blade straiteners. All they really are is 3 washers. Each washer is about an inch wide. I bent them about 3/4 of the way up at a 90degree angle so they will sit on the jaws of your bench vise with out falling off. Put 2 on one side near the eadges of the vise jaw and the other in the center of the other jaw. If I have a warped blade I usually put my blade back in the oven at the tempature I used for the temper. I let it soak about 15 to 20 minutes pull the blade out and put it in the vise so the warped spot is at the washer that is in the center of the vise jaw. Then carefully tighten the vise. The washers will then allow the blade to bend. I know this is kinda confusing to explain I might have to take a picture. This has always work for me on both stainless and carbon steel blades. One of the old time makers showed me this trick and it has saved me a lot of head aches.

Permalink Reply by Bear Goode on December 16, 2010 at 12:55pm

Shane thanks for your input.I will pass this along to my Buddy.I can envision what you are  saying about the washers. Again thank you,Bear Goode, Bear Knives

Shane Paul Atwood said:

I have a set of things I call blade straiteners. All they really are is 3 washers. Each washer is about an inch wide. I bent them about 3/4 of the way up at a 90degree angle so they will sit on the jaws of your bench vise with out falling off. Put 2 on one side near the eadges of the vise jaw and the other in the center of the other jaw. If I have a warped blade I usually put my blade back in the oven at the tempature I used for the temper. I let it soak about 15 to 20 minutes pull the blade out and put it in the vise so the warped spot is at the washer that is in the center of the vise jaw. Then carefully tighten the vise. The washers will then allow the blade to bend. I know this is kinda confusing to explain I might have to take a picture. This has always work for me on both stainless and carbon steel blades. One of the old time makers showed me this trick and it has saved me a lot of head aches.

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