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The Water Cooler
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Hardening Mild Steel - Anyone know any tricks
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<blockquote data-quote="dennishoddy" data-source="post: 1626375" data-attributes="member: 5412"><p>Why not just buy some 4140, or tool steel, and be done with it.</p><p></p><p>You can buy oil quench or air quench in the tool steel. </p><p></p><p>If you get oil quench, its really easy to harden and then temper.</p><p></p><p>Oil quench tool steel, is magnetic, but at proper quench temperature, it will loose its ability to be magnetic.</p><p></p><p>Suspend it over a vessel of quench oil on a magnet, heat it until it looses its magnetism, and it will drop into the quench oil.(google quench oil)</p><p></p><p>The material will be in excess of 60 Rockwell when it cools.</p><p></p><p>Hold it with some vice grips, and use a cutting torch with a heating tip, and brush it back and forth across the material.</p><p></p><p>When it turns a light brown patina, it will Rockwell around a 45. The darker the patina, the softer the metal will be.</p><p></p><p>I was shown this in 1980 by a machinist that was 85 years old. He learned it as a young man.</p><p></p><p>You asked for some tricks of the trade. you just got a good one. <img src="/images/smilies/biggrin.png" class="smilie" loading="lazy" alt=":D" title="Big Grin :D" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="dennishoddy, post: 1626375, member: 5412"] Why not just buy some 4140, or tool steel, and be done with it. You can buy oil quench or air quench in the tool steel. If you get oil quench, its really easy to harden and then temper. Oil quench tool steel, is magnetic, but at proper quench temperature, it will loose its ability to be magnetic. Suspend it over a vessel of quench oil on a magnet, heat it until it looses its magnetism, and it will drop into the quench oil.(google quench oil) The material will be in excess of 60 Rockwell when it cools. Hold it with some vice grips, and use a cutting torch with a heating tip, and brush it back and forth across the material. When it turns a light brown patina, it will Rockwell around a 45. The darker the patina, the softer the metal will be. I was shown this in 1980 by a machinist that was 85 years old. He learned it as a young man. You asked for some tricks of the trade. you just got a good one. :D [/QUOTE]
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Hardening Mild Steel - Anyone know any tricks
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