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Rifles, Reloading, Optics, Equipment
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High Pressure Tool Steel
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<blockquote data-quote="Trickymissfit" data-source="post: 959736" data-attributes="member: 25383"><p>Seriously, I could build you a cartridge case that would easily handle 100K psi, but also send you to the trauma ward. You could never resize it, and cost alone would be unreal. In a rifle, you want the weak link to be much weaker than the action and a planned point of failure. Somewhere along the way an engineer sat down with a calculator and steel manuals figuring out what kind of strength he's built into the action. He's not always looking at what it takes to blow the action up, but probably looking at the yield strength of the steel (or whatever they used). Once a piece of steel surpasses it's yield point, it can never come back to what it was in it's original form. It's like bending a piece of steel in a vise. Another issue is metal fatigue, and how soon the steel is taxed beyond a point that is acceptable. As you fire the rifle under high pressure (lets think of 65K psi) the typical action is moving in several directions at the sametime for a very few milliseconds. Not a lot, but it's moving. The bridge alone expands and then contracts back to the OEM spec. The bolt actually compresses, and the stretches a little bit. Plus a twisting motion is transferred back to the bolt face from the stress created by the bullet striking the lands and grooves. These stresses done over and over fatigues the metal if the forces are too high, and trust me that engineer has the square inches of metal calculated, and will build in a safety factor to keep us alive. Many work on a two to one safety factor and some probably think of four to one. This also is tested from time to time in destructive testing, where they want to blow the action up. A good read on this is from either Bob Greanleaf or maybe M.L. McPherson on how to blow up an action as written in precision Shooting magazine. (believe he seriously blew up a Savage action). The article is an eye opener! A case made of tool steel (lets say something really good like A2 or S5 (S5 would be my pick) would not react well to the constant stretching and compression for starters. The granular structure is virtually inflexible, but also very fine in structure. Strength wise it has it all, but is also a fish out of water. On the otherhand a case made of brass will flex, stretch, and fill the voids of the chamber effortlessly. Yes it's not as strong , but also remember the actions are designed for 70K and less (really 65K and less). Ever break a drill bit while drilling a hole? We all have! That's what the case would be like with 60K psi in it! </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 959736, member: 25383"] Seriously, I could build you a cartridge case that would easily handle 100K psi, but also send you to the trauma ward. You could never resize it, and cost alone would be unreal. In a rifle, you want the weak link to be much weaker than the action and a planned point of failure. Somewhere along the way an engineer sat down with a calculator and steel manuals figuring out what kind of strength he's built into the action. He's not always looking at what it takes to blow the action up, but probably looking at the yield strength of the steel (or whatever they used). Once a piece of steel surpasses it's yield point, it can never come back to what it was in it's original form. It's like bending a piece of steel in a vise. Another issue is metal fatigue, and how soon the steel is taxed beyond a point that is acceptable. As you fire the rifle under high pressure (lets think of 65K psi) the typical action is moving in several directions at the sametime for a very few milliseconds. Not a lot, but it's moving. The bridge alone expands and then contracts back to the OEM spec. The bolt actually compresses, and the stretches a little bit. Plus a twisting motion is transferred back to the bolt face from the stress created by the bullet striking the lands and grooves. These stresses done over and over fatigues the metal if the forces are too high, and trust me that engineer has the square inches of metal calculated, and will build in a safety factor to keep us alive. Many work on a two to one safety factor and some probably think of four to one. This also is tested from time to time in destructive testing, where they want to blow the action up. A good read on this is from either Bob Greanleaf or maybe M.L. McPherson on how to blow up an action as written in precision Shooting magazine. (believe he seriously blew up a Savage action). The article is an eye opener! A case made of tool steel (lets say something really good like A2 or S5 (S5 would be my pick) would not react well to the constant stretching and compression for starters. The granular structure is virtually inflexible, but also very fine in structure. Strength wise it has it all, but is also a fish out of water. On the otherhand a case made of brass will flex, stretch, and fill the voids of the chamber effortlessly. Yes it's not as strong , but also remember the actions are designed for 70K and less (really 65K and less). Ever break a drill bit while drilling a hole? We all have! That's what the case would be like with 60K psi in it! gary [/QUOTE]
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