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The Range
NFA & Class III Discussion
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<blockquote data-quote="Sanjuro82" data-source="post: 1882261" data-attributes="member: 14058"><p>It can harm the heat treat, but done correctly the heat treat can be left pretty much unharmed. Most barrel are 4141 or 4150 and once you get above 500-600 degrees that type of steel will begin to temper. Disregard the annealing comment. Most folks can be a bit confused with heat treating. In particular terms like tempering and annealing can get mixed around. An annealed piece of steel is one that has been heated up to critical temp (the point at which is loses magnetism), and then it is cooled very slowly. When annealed properly, the steel will be in it's most mailable and soft form at room temp. Critical temp will be well above 1600 so annealing won't come into play unless you bring the whole barrel up to cherry red.</p><p></p><p>You could lose up to 10-30 off the Rockwell if you bring the barrel up to 1100-1200 degrees carelessly. To minimize the loss of the barrel's temper there are a few things you can do to.</p><p></p><p>1. Heat the muzzle up as quick as possible by using an oxy-acetylene torch. The longer it takes to get to the soldering temp, the more heat will be transfer down the barrel. Heat transfer is what you want to minimize. </p><p>2. Use a heat stop paste on area of the barrel that aren't being soldered. </p><p>3. The barrel/rifle (minus the muzzle) can be suspended in water, again to prevent/slow the heat transfer down the barrel.</p></blockquote><p></p>
[QUOTE="Sanjuro82, post: 1882261, member: 14058"] It can harm the heat treat, but done correctly the heat treat can be left pretty much unharmed. Most barrel are 4141 or 4150 and once you get above 500-600 degrees that type of steel will begin to temper. Disregard the annealing comment. Most folks can be a bit confused with heat treating. In particular terms like tempering and annealing can get mixed around. An annealed piece of steel is one that has been heated up to critical temp (the point at which is loses magnetism), and then it is cooled very slowly. When annealed properly, the steel will be in it's most mailable and soft form at room temp. Critical temp will be well above 1600 so annealing won't come into play unless you bring the whole barrel up to cherry red. You could lose up to 10-30 off the Rockwell if you bring the barrel up to 1100-1200 degrees carelessly. To minimize the loss of the barrel's temper there are a few things you can do to. 1. Heat the muzzle up as quick as possible by using an oxy-acetylene torch. The longer it takes to get to the soldering temp, the more heat will be transfer down the barrel. Heat transfer is what you want to minimize. 2. Use a heat stop paste on area of the barrel that aren't being soldered. 3. The barrel/rifle (minus the muzzle) can be suspended in water, again to prevent/slow the heat transfer down the barrel. [/QUOTE]
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