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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Musings on barrel life...
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<blockquote data-quote="Dzaw" data-source="post: 193716" data-attributes="member: 7794"><p>AISI / SAE steel classifications:</p><p></p><p>41xx - Chromium 0.5% - 0.95% and Molybdenum 0.12% - 0.20%</p><p></p><p>the xx is the standard notation for carbon content 4150 has approximately 0.5% carbon, 4160 has approximately 0.6% carbon.</p><p></p><p>The letters CM after the name are a redundancy - they are completely unneccessary, as being in the 41XX family of steels, they are, by definition a CM formula.</p><p></p><p>Depending on how exatly the steel mill made a particular batch, their quality control, etc, 4150 and 4160 are close enough that they could end up being functionally identical. Certainly, the extra .1% carbon does make a pretty big difference, but standard tolerance levels in carbon content mean that 4150 can have as much as 0.55% carbon and still meet grade, and 4160 can have as little as 0.56% and still meet grade. </p><p></p><p>In a perfect world, there would be a reliable and stark difference between the two, and steel from hign quality, reputable mills does show a notieable distinction, but that isn't ALWAYS the case.</p><p></p><p>I've looked at the 5C rifling design. It's an interesting idea, canting the rifling like that. It looks like a sharp cornered version of polygonal rifling, being about halfway from traditional to poly. It seems to offer many of the same benefits of polygonal rifling, and has been showing off pretty well in competition.</p></blockquote><p></p>
[QUOTE="Dzaw, post: 193716, member: 7794"] AISI / SAE steel classifications: 41xx - Chromium 0.5% - 0.95% and Molybdenum 0.12% - 0.20% the xx is the standard notation for carbon content 4150 has approximately 0.5% carbon, 4160 has approximately 0.6% carbon. The letters CM after the name are a redundancy - they are completely unneccessary, as being in the 41XX family of steels, they are, by definition a CM formula. Depending on how exatly the steel mill made a particular batch, their quality control, etc, 4150 and 4160 are close enough that they could end up being functionally identical. Certainly, the extra .1% carbon does make a pretty big difference, but standard tolerance levels in carbon content mean that 4150 can have as much as 0.55% carbon and still meet grade, and 4160 can have as little as 0.56% and still meet grade. In a perfect world, there would be a reliable and stark difference between the two, and steel from hign quality, reputable mills does show a notieable distinction, but that isn't ALWAYS the case. I've looked at the 5C rifling design. It's an interesting idea, canting the rifling like that. It looks like a sharp cornered version of polygonal rifling, being about halfway from traditional to poly. It seems to offer many of the same benefits of polygonal rifling, and has been showing off pretty well in competition. [/QUOTE]
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