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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  
Old 12-17-2015, 08:19 PM
torchart torchart is offline
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question about tempering

I am using 5160 to build my knives with. and I know what the book says about time and temperature.but I would like to tell you what I am doing and if you would tell me what ill effects if any I can expect.
first In my electric kiln I bring the blank blade up to 1600 F. and turn the kiln off leaving the blade in to slowly cool till the next day. after that I drill holes and do some grinding. then to harden the blade I return the blade to the kill and bring it back up to 1600F. and quench in 125F. oil. after that it goes in the oven at 400F. for two hours. I know this isn't just what the book says. but can I expect this knife to hold a edge. or is it junk ?
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Old 12-17-2015, 08:41 PM
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ricky_arthur ricky_arthur is offline
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I would heat to 1525-1550. Other than that I see nothing wrong with your process. 5160 is fairly forgiving.
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Old 12-17-2015, 09:55 PM
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Hunter10139 Hunter10139 is offline
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According to Kevin cashens heat treatment info you only want to go to 1525 F for 5160 to harden it. 1600 is a little too hot.


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Old 12-18-2015, 05:14 AM
jmccustomknives jmccustomknives is offline
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The nice thing about 5160 is it is very forgiving. I'd suggest breaking one of your blades before tempering and reading the grain structure. If the grain is good then you are ok in what you are doing. A large grain structure indicates your overheating.
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Old 12-18-2015, 07:11 AM
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Hunter10139 Hunter10139 is offline
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Compare the grain to that of a file if you do break it. You want your grain to look similar to that of a file.


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Old 12-19-2015, 05:57 AM
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Crex Crex is offline
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Looks like velvet - all good
Looks like cornbread - too hot


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Old 12-19-2015, 01:55 PM
Doug Lester Doug Lester is offline
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The tempering is going to effect the edge retention most. I would start out at 375? and check the edge. Of course this would depend on the use I intended to put the blade too. If I was making a big chopper I might well go to 400? for a softer edge but if it was going to be used as a slicer you might well be better off with a harder blade.

As far as the annealing goes, I've abandoned it a long time ago without any problems. Some say that a critical anneal like you are doing can cause the carbides to clump but 5160 with it's relatively low carbon doesn't have much in the way of carbides to start with.

Doug


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5160, 550, art, back, blade, blades, book, build, carbon, chopper, drill, edge, file, grinding, harden, heat, heat treatment, hot, knife, knives, making, retention


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