dickb Posted October 9, 2015 Share Posted October 9, 2015 I've made a few knives and lots of flint and steel strikers.Some of the knives are 1084 and some are 1095. The strikers were made from worn out files.The blade are about 6 inches long not counting the tang. Some hidden tang, some full tang. The blade height is usually about one inch. I would like to try making a knife with the spine hard enough to throw sparks when struck with a piece of flint.Does anyone have a suggestion how to heat treat a blade so the edge and spine are hard and leave some softer steel near the middle to reduce the overall brittleness? Quote Link to comment Share on other sites More sharing options...
Michael Cochran Posted October 9, 2015 Share Posted October 9, 2015 My first thought would be using clay over the central part of the blade allowing for a differential hardening. I've never tried this so I cannot attest to how it would or wouldn't work. Quote Link to comment Share on other sites More sharing options...
Charlotte Posted October 9, 2015 Share Posted October 9, 2015 I have a vague memory of an article in which daggers were quenched with a heavy bar clamped on both sides. Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted October 9, 2015 Share Posted October 9, 2015 selective temper the middle much softer.... Quote Link to comment Share on other sites More sharing options...
Michael Cochran Posted October 9, 2015 Share Posted October 9, 2015 selective temper the middle much softer....Steve, forgive my ignorance but how would one do that on a blade that small? I think I know how to do something like it on a much bigger blade. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted October 9, 2015 Share Posted October 9, 2015 tempering tongs Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 9, 2015 Share Posted October 9, 2015 Forgot to hit send again!A red hot bar or a small torch flame keeping the edges quenced to slow the tempering of the edges. Quote Link to comment Share on other sites More sharing options...
Michael Cochran Posted October 10, 2015 Share Posted October 10, 2015 Thanks, Thomas and Charles. I overlooked the obvious answer again. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 10, 2015 Share Posted October 10, 2015 Na, your just not lazy enugh... Quote Link to comment Share on other sites More sharing options...
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