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Rifles, Reloading, Optics, Equipment
Gunsmithing
Pedersoli Sharps chamber pressures?
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<blockquote data-quote="Trickymissfit" data-source="post: 431124" data-attributes="member: 25383"><p>Tom, an excellent post!!</p><p> </p><p>* 1020 0r 1018 is just plain old cold rolled steel like you said. Where as 8620 is a hot rolled steel with very good machining properties to it. You can carburize and harden 8620 (that is the process used to add a hard shell to the surface of 8620. But you can also just carburize it (this will imbed carbon into the surface), and then take it thru a nitride process (I rarely used this process). Now with the Chinese M14's being made of chrome moly steel, I now see something very interesting! One could dissassemble the rifle, and then take the reciever and a few other choice items (bolt carrier and gas piston assembly come to mind) and have them nitrided for about a .012" to a .018" case. Takes about one full day at the max. The action sizes will change little if any when done correctly. (note: I have had some steels shrink about .0009" and even a couple grow a similar amount!). I'm sure that's all the Fulton Armory is doing.</p><p> Back to Chi Com M14's a second. I doubt they are even doing a full hardening of the reciever group when all they needed was a piece of 4150 pretreat steel or even 4350 pretreat steel. C/M maxes out in the mid to low forties on the Rockwell C scale (I think 4350 may reach about 47 RC if it good quality stuff). A piece of 4150 or 4350 Pretreat steel is shipped 28-32RC (I used to buy the stuff by the truck loads), and it's all pretty much the same till you start machining it. The off shore steel is junk! But just as importantly, you can take a piece of 4150 and send it strait to nitride without ever doing anything else to it! 29 Hours in a good furnace at 900 degrees will get about .035" case that will go about 62RC.</p><p> Lastly, the United States has some very good steel producers. I like the pretreat stuff from Baldwin in PA the best by far! I've learned that if the steel is cheap the results are just as cheap. The very best steel sold out there period comes from Timken, but it's also the most expensive (you make that high cost up down the road)</p><p> gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 431124, member: 25383"] Tom, an excellent post!! * 1020 0r 1018 is just plain old cold rolled steel like you said. Where as 8620 is a hot rolled steel with very good machining properties to it. You can carburize and harden 8620 (that is the process used to add a hard shell to the surface of 8620. But you can also just carburize it (this will imbed carbon into the surface), and then take it thru a nitride process (I rarely used this process). Now with the Chinese M14's being made of chrome moly steel, I now see something very interesting! One could dissassemble the rifle, and then take the reciever and a few other choice items (bolt carrier and gas piston assembly come to mind) and have them nitrided for about a .012" to a .018" case. Takes about one full day at the max. The action sizes will change little if any when done correctly. (note: I have had some steels shrink about .0009" and even a couple grow a similar amount!). I'm sure that's all the Fulton Armory is doing. Back to Chi Com M14's a second. I doubt they are even doing a full hardening of the reciever group when all they needed was a piece of 4150 pretreat steel or even 4350 pretreat steel. C/M maxes out in the mid to low forties on the Rockwell C scale (I think 4350 may reach about 47 RC if it good quality stuff). A piece of 4150 or 4350 Pretreat steel is shipped 28-32RC (I used to buy the stuff by the truck loads), and it's all pretty much the same till you start machining it. The off shore steel is junk! But just as importantly, you can take a piece of 4150 and send it strait to nitride without ever doing anything else to it! 29 Hours in a good furnace at 900 degrees will get about .035" case that will go about 62RC. Lastly, the United States has some very good steel producers. I like the pretreat stuff from Baldwin in PA the best by far! I've learned that if the steel is cheap the results are just as cheap. The very best steel sold out there period comes from Timken, but it's also the most expensive (you make that high cost up down the road) gary [/QUOTE]
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Pedersoli Sharps chamber pressures?
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