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Cracked Remington action.
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<blockquote data-quote="Trickymissfit" data-source="post: 1214449" data-attributes="member: 25383"><p>In the modern world (say the last thirty years or maybe even forty), we started learning machine processes known as "hard turning." Steel started coming thru that was called out as pre-hardened. Earliest I've dealt with was Maxell 3 1/2, and it was nothing like today's steels. Yet we learned fast. Maxell was prone to surface cracks, but still was pretty good. Then a couple new steels showed up around 1980. One I can't for the life of me remember the name, and the other was Versalloy. These two changed everything! Yet all three were 4*** series steel (I suspect all three were 4150 or 4160 C/M steel). The real issue back then was that they only came in round stock except for Maxell, and trust me this was important. Versalloy came in a centerless ground finish that was .020" to .035" over size. Then Baldwin and a couple others started doing 4150 pre-treat flat stock, but in a rough finish. Sometime around 1990 one of the big players offered it in a ground finish similar to gauge stock. And we just kept evolving from there till Baldwin offered a pretreat 17PH-4 stainless steel (pricey stuff by the way).</p><p></p><p>Now one would think hey they do 4*** steel in a pre-hardened for, so why not A2 or O-1? Not worth the time as these steels are rarely hardened under 54RC. Your typical 4350 or 4360 tops out at 47RC. Strength wise the 4*** series is the best. Yes you can cut a piece of A2 with a 60RC, but not on a production line! You can pretty much forget about 4*** with a 40 Rockwell. Yet 28 to 32RC does pretty well. </p><p></p><p>S why do I buy 4150,4350,4360 pre-hard steels? MONEY! I can machine it to size without adding extra stock because I have to heat treat it. Modern C/M steels are pretty much drama free, and the same can be said of the better brands of pre-hard steels. Forget the Asian stuff, and I'm not very impressed with much of the European steels these days. C/M pre hard steels with cracks or retained martensite are a rare sight. Just doesn't happen. Even if you nitride the pre-hard steels! </p><p></p><p>I would suspect that manufacture tried a new steel supplier, or the supplier added some Asian steel into their truck load of steel. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 1214449, member: 25383"] In the modern world (say the last thirty years or maybe even forty), we started learning machine processes known as "hard turning." Steel started coming thru that was called out as pre-hardened. Earliest I've dealt with was Maxell 3 1/2, and it was nothing like today's steels. Yet we learned fast. Maxell was prone to surface cracks, but still was pretty good. Then a couple new steels showed up around 1980. One I can't for the life of me remember the name, and the other was Versalloy. These two changed everything! Yet all three were 4*** series steel (I suspect all three were 4150 or 4160 C/M steel). The real issue back then was that they only came in round stock except for Maxell, and trust me this was important. Versalloy came in a centerless ground finish that was .020" to .035" over size. Then Baldwin and a couple others started doing 4150 pre-treat flat stock, but in a rough finish. Sometime around 1990 one of the big players offered it in a ground finish similar to gauge stock. And we just kept evolving from there till Baldwin offered a pretreat 17PH-4 stainless steel (pricey stuff by the way). Now one would think hey they do 4*** steel in a pre-hardened for, so why not A2 or O-1? Not worth the time as these steels are rarely hardened under 54RC. Your typical 4350 or 4360 tops out at 47RC. Strength wise the 4*** series is the best. Yes you can cut a piece of A2 with a 60RC, but not on a production line! You can pretty much forget about 4*** with a 40 Rockwell. Yet 28 to 32RC does pretty well. S why do I buy 4150,4350,4360 pre-hard steels? MONEY! I can machine it to size without adding extra stock because I have to heat treat it. Modern C/M steels are pretty much drama free, and the same can be said of the better brands of pre-hard steels. Forget the Asian stuff, and I'm not very impressed with much of the European steels these days. C/M pre hard steels with cracks or retained martensite are a rare sight. Just doesn't happen. Even if you nitride the pre-hard steels! I would suspect that manufacture tried a new steel supplier, or the supplier added some Asian steel into their truck load of steel. gary [/QUOTE]
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