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Rifles, Reloading, Optics, Equipment
Reloading
Lee vs RCBS presses and equipment
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<blockquote data-quote="Trickymissfit" data-source="post: 932804" data-attributes="member: 25383"><p>The curved train rails are made of a higher grade alloy than the typical strait stuff. I think I was told they contain a higher amount of molybdenum, but don't quote me on that as it's been fifty years since I was told that by a steel supplier. </p><p> </p><p>A further note on cast irons and cast steels. Cast iron can be extremely rigid, or can be a little flexible; depending on the grade and of course type. The better grades (more rigid) are also somewhat more expensive. There is a common grade of cast iron that is cast and reheat treated into a "pearlite state". This is what Ford used to make their third members out of because it was stronger. Yet also flexed a little bit under higher pressure loads. Mehinite (sp) is the best grade money can buy. Very rigid with a very fine grain in it. An aged chunk of it is a prized possession! Most machine frames are cast from a good grade of cast iron, but not mehinite. Over time folks have added chrome and even nickel to the alloy to give it better properties (how much and why is closely guarded). Then there is a form of cast iron known as semi steel. Machines easier and is cheaper, but not as rigid. Cast steel is much more ductile than cast iron, so it will flex under high pressures, but is also known to be stronger depending on what you add into the alloy mix. You can also add graphite to either one to make it a little more rigid, but how much of an improvement is constantly debated unless your selling it. </p><p> </p><p>In a reloading press, I doubt any one here is going to achieve the pressure loads to move a good grade of cast iron that much. Still somebody will in the end!</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 932804, member: 25383"] The curved train rails are made of a higher grade alloy than the typical strait stuff. I think I was told they contain a higher amount of molybdenum, but don't quote me on that as it's been fifty years since I was told that by a steel supplier. A further note on cast irons and cast steels. Cast iron can be extremely rigid, or can be a little flexible; depending on the grade and of course type. The better grades (more rigid) are also somewhat more expensive. There is a common grade of cast iron that is cast and reheat treated into a "pearlite state". This is what Ford used to make their third members out of because it was stronger. Yet also flexed a little bit under higher pressure loads. Mehinite (sp) is the best grade money can buy. Very rigid with a very fine grain in it. An aged chunk of it is a prized possession! Most machine frames are cast from a good grade of cast iron, but not mehinite. Over time folks have added chrome and even nickel to the alloy to give it better properties (how much and why is closely guarded). Then there is a form of cast iron known as semi steel. Machines easier and is cheaper, but not as rigid. Cast steel is much more ductile than cast iron, so it will flex under high pressures, but is also known to be stronger depending on what you add into the alloy mix. You can also add graphite to either one to make it a little more rigid, but how much of an improvement is constantly debated unless your selling it. In a reloading press, I doubt any one here is going to achieve the pressure loads to move a good grade of cast iron that much. Still somebody will in the end! [/QUOTE]
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Lee vs RCBS presses and equipment
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