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Rifles, Reloading, Optics, Equipment
Gunsmithing
Recoil lug thickness studies
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<blockquote data-quote="jpndave" data-source="post: 2815514" data-attributes="member: 5437"><p>Strength of parts generally can be increased in three ways, more mass (thicker part in this case), stronger material such as going from a mild steel w/strength of ~40kpsi to a high heat treated alloy that could go over 200kpsi, and third better design which would be difficult with the constraints of the existing system. Better bedding would absolutely add to the strength. If the recoil force is applied in sheer right against the action that much different than a bending force lower on the lug.</p><p></p><p>Steel is NOT all the same strength and the difference between annealed (dead soft) and a high heat treat can be substantial depending on the alloy. Generally the higher the heat treat the more brittle the steel becomes. The yield point (bend) gets a lot closer to the ultimate or failure point (break).</p><p></p><p>I am going to try a Titanium Alloy on a Kimber 84M I am building because I want to see what it does. I'll use a 145ksi titanium alloy which is stronger than most steels, even some alloys with a decent heat treat. 416 as below is 120kpsi max which is probably what is in there now and not up to the upper end heat treat either.</p><p></p><p>I'm not certain what the factory ones are, likely 416 & 4140 or 4340? Aftermarket are all over the place 416 (75-120kpsi), 4340 (ultimate 100-190kpsi), 4140 (ultimate 100-160kpsi), 17-4 (130-200kpsi). For reference 1020 mild steel (ultimate 62-67kpsi). So yes, material and heat treat do matter. In this use, the bedding is far more important though.</p></blockquote><p></p>
[QUOTE="jpndave, post: 2815514, member: 5437"] Strength of parts generally can be increased in three ways, more mass (thicker part in this case), stronger material such as going from a mild steel w/strength of ~40kpsi to a high heat treated alloy that could go over 200kpsi, and third better design which would be difficult with the constraints of the existing system. Better bedding would absolutely add to the strength. If the recoil force is applied in sheer right against the action that much different than a bending force lower on the lug. Steel is NOT all the same strength and the difference between annealed (dead soft) and a high heat treat can be substantial depending on the alloy. Generally the higher the heat treat the more brittle the steel becomes. The yield point (bend) gets a lot closer to the ultimate or failure point (break). I am going to try a Titanium Alloy on a Kimber 84M I am building because I want to see what it does. I'll use a 145ksi titanium alloy which is stronger than most steels, even some alloys with a decent heat treat. 416 as below is 120kpsi max which is probably what is in there now and not up to the upper end heat treat either. I'm not certain what the factory ones are, likely 416 & 4140 or 4340? Aftermarket are all over the place 416 (75-120kpsi), 4340 (ultimate 100-190kpsi), 4140 (ultimate 100-160kpsi), 17-4 (130-200kpsi). For reference 1020 mild steel (ultimate 62-67kpsi). So yes, material and heat treat do matter. In this use, the bedding is far more important though. [/QUOTE]
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Recoil lug thickness studies
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