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....
Replies to This Discussion
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Permalink Reply by Arthur Summers on -
I think you can straighten the blade be for it gets to room temp. I agree with you I don't think that is a good idea to heat with a torch. Or put it this way I'm not going to do that.
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Permalink Reply by Bear Goode on
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I agree with you Art. Seems to me it will leave a "weak" spot .I was alarmed,I do not think it will do anyone or "knife" any good!
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Permalink Reply by Arthur Summers on
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NO one else has a Comment ???????
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Permalink Reply by Bear Goode on
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Art, I wonder if anyone else has a better way to straighten blades after heattreating?
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Permalink Reply by Arthur Summers on
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I haven't had a blade warp yet , but have had a tapered tang warp and I just regrind to flat again.
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Permalink Reply by Bear Goode on
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Thanks Art,I told him right along the line of what you said.That grinding it out might be the best for the steel.Again Thank you.
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Permalink Reply by Ben Sobieck on -
Bear, can you post a photo of the warped knife?
As an aside, some people seek out crooked knives. Check this out.
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Permalink Reply by Bear Goode on
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Thanks Ben, Iwill try to get him to get me a pic. of the knifes.
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Permalink Reply by Ronald Rosenbaugh on
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On a stainless blade it is very difficult to correct a warp without doing another heat treat. The blade is really too brittle to "bend" back into shape without possibly causing a crack or break. When I have had stainless blades come out of heat treat warped, I will put them back into the heat treat oven for a second heat treat, including soak time at temperature, and then plate quench the blade when it is ready to come out of the oven. I have two heavy flat steel blocks that I put the hot blade between and the plates soak away the temperature and flatten the blade quickly. It is faster than an air quench so the blade gets the proper hardness. After the plate quench, do your regular temper cycles and cryo cycle if desired. Rarely do I have a problem with straightness when I plate quench.
Ron Rosenbaugh Knives
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Permalink Reply by Bear Goode on
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Thanks Ron, I will tell him about the plate quench. And the second heat treat. I thank you all for the info.Sincerly Bear Goode,Bear Knives
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Permalink Reply by Jacque W. Eagon on -
Have a look at this thread on Blade Magazine's Forum
http://forum.blademag.com/tm.aspx?m=2965&mpage=1&key=&#...
Jacque Eagon
Eagon Leather & Knives
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Permalink Reply by Bear Goode on
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Thanks J.W Eagon, This is just about what he is doing,only with stainless steel.
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