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How do you "Harden" Metal
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<blockquote data-quote="bgm" data-source="post: 188778" data-attributes="member: 1754"><p>I'm a tool & die maker at my full time job, so I can say your right on the money with steel types and hardening.</p><p></p><p>Use of the wrong hardening procedures will damage the part. For instance if you quench a piece of air hardening steel in water, you will have cracks form and I have even seen the part turn to "gravel" in the bottom of the quench bucket.</p><p></p><p>After the steel is hard it must be tempered or drawn back to a useful state. If it's left full hard it will be brittle and crack VERY easily. Dropping some steels in full hard condition will cause them to shatter against the concrete floor.</p><p></p><p>As someone else pointed out, welding a hard face on unknown material can present possible problems as well. The heat affected zone at the weld can become embrittled and hard. Without the knowledge of the steel type it's difficult to know how to draw it back properly. You can end up with the built up hard face edge broken neatly off the piece right at the weld line.</p><p></p><p>Since it's in an auger application with replaceable teeth, failure of the tooth will not likely be catastrophic, so it doesn't hurt alot to experiment.</p><p></p><p>Just some info for what it's worth.</p><p></p><p>Good luck</p><p></p><p>Bryan</p></blockquote><p></p>
[QUOTE="bgm, post: 188778, member: 1754"] I'm a tool & die maker at my full time job, so I can say your right on the money with steel types and hardening. Use of the wrong hardening procedures will damage the part. For instance if you quench a piece of air hardening steel in water, you will have cracks form and I have even seen the part turn to "gravel" in the bottom of the quench bucket. After the steel is hard it must be tempered or drawn back to a useful state. If it's left full hard it will be brittle and crack VERY easily. Dropping some steels in full hard condition will cause them to shatter against the concrete floor. As someone else pointed out, welding a hard face on unknown material can present possible problems as well. The heat affected zone at the weld can become embrittled and hard. Without the knowledge of the steel type it's difficult to know how to draw it back properly. You can end up with the built up hard face edge broken neatly off the piece right at the weld line. Since it's in an auger application with replaceable teeth, failure of the tooth will not likely be catastrophic, so it doesn't hurt alot to experiment. Just some info for what it's worth. Good luck Bryan [/QUOTE]
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