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I Forge Iron

4140 steel to forge a machete

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I usually quench in oil and then flame temper immediately.  Oil flames at about 600 - 650 degrees fahrenheit.  I dip in my quench oil and flame off several times.  It is not too critical as these medium carbon steels will not have the extreme hardening that you might get with high carbon steels so they are not prone to cracking or bending as much as higher carbon steels are.  You get a nice edge that will sharpen up well and has medium durability with quite good toughness... all good qualities for impact tools like axes and machetes!  

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I want to experiment to make an hollow handle for the machete. I do not have any 5160 rod, but I have a 4140 rod. Since I do not like so much seams for hollow handles, I will just drill a bit of the 4140 rod to make the handle. If needed I will make adjustments of the hollow handle in the forge...

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