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The Range
NFA & Class III Discussion
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<blockquote data-quote="Shadowrider" data-source="post: 1882714" data-attributes="member: 3099"><p>Only to reach 100% total heat saturation. Then like Sanjuro said, cool it very slowly over a number of hours.</p><p> </p><p></p><p></p><p>Tempering and anealing are as different as black and white.</p><p></p><p>If you are losing hardness (temper) you have gotten to critical temp. If you use a torch it's quite easy to get the surface and slightly below it (where you hardness testing it later) to critical. That may be why you've seen it happen. Also that's why almost every heat treat specification I've ever heard of specifically forbids open flame furnaces, among a myriad of other reasons. You can put the barrel into an electric oven and subject it to no more than 1100° and leave it for days. Cool it down slow, and you won't lose any hardness. </p><p></p><p></p><p></p><p>Good idea, if you can control the heat.</p></blockquote><p></p>
[QUOTE="Shadowrider, post: 1882714, member: 3099"] Only to reach 100% total heat saturation. Then like Sanjuro said, cool it very slowly over a number of hours. Tempering and anealing are as different as black and white. If you are losing hardness (temper) you have gotten to critical temp. If you use a torch it's quite easy to get the surface and slightly below it (where you hardness testing it later) to critical. That may be why you've seen it happen. Also that's why almost every heat treat specification I've ever heard of specifically forbids open flame furnaces, among a myriad of other reasons. You can put the barrel into an electric oven and subject it to no more than 1100° and leave it for days. Cool it down slow, and you won't lose any hardness. Good idea, if you can control the heat. [/QUOTE]
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