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Rifles, Reloading, Optics, Equipment
Gunsmithing
Cracked Remington action.
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<blockquote data-quote="shortgrass" data-source="post: 1214237" data-attributes="member: 24284"><p>The only way to know for sure that what we see in the photo is a crack is by Magna-Flux testing. Can heat treated and tempered 4140 crack? Sure,,,, all it takes is a heavy enough impact in the right place. There seems to be an assumtion that actions are heat treated and tempered , by Remington, after machining is complete. If as much material was machined away to 'make' an action, before heat treatment, it would wad itself into something not useful upon quench. Going from 1600*+ into an oil quench of 100* or less tends to do that. There'd be so much warpage they'd be un-usable. These, and most other actions, are made of materials that are already heat treated at the steel mill. Steels heat treated and tempered to 32C (plus or minus) can be cut with high speed tooling. They're pretty easily cut with a mill bastard file!</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1214237, member: 24284"] The only way to know for sure that what we see in the photo is a crack is by Magna-Flux testing. Can heat treated and tempered 4140 crack? Sure,,,, all it takes is a heavy enough impact in the right place. There seems to be an assumtion that actions are heat treated and tempered , by Remington, after machining is complete. If as much material was machined away to 'make' an action, before heat treatment, it would wad itself into something not useful upon quench. Going from 1600*+ into an oil quench of 100* or less tends to do that. There'd be so much warpage they'd be un-usable. These, and most other actions, are made of materials that are already heat treated at the steel mill. Steels heat treated and tempered to 32C (plus or minus) can be cut with high speed tooling. They're pretty easily cut with a mill bastard file! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Cracked Remington action.
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