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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
17-4 PH Stainless cut rifled barrels
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<blockquote data-quote="Trickymissfit" data-source="post: 453165" data-attributes="member: 25383"><p>I'm with you Tom! 15-5 and all the way into 18 & 19 series are steels I'm not at my best. I had some 15-5 laying around for a project, but never had the time to cut a chip. 17PH4 is one that I've done some things with, and it's an extremely strong steel, but I never was completely in love with it for an ordenance grade steel (somebody probably knows more than I do). What I found out was that 17PH4 rearc melt and MAR-10 were very similar, but with the latter being much more rust resistent. I could not see any advantage one had over the other in high heat, but others thought the MAR-10 seemed to come out with a better surviving thread form under serious heat (as I said I could see no real difference). But what I did see was a steel that fit somewhere between 330 and 349 stainless, but seemed to have a little carbon to harden. Both steel were shipped 28-32rc, but when you were cutting it you knew the difference. The shavings comming off MAR-10 were extremely hot! Was one stronger than the other? This I'd have to research again as I don't have the paperwork in front of me. (I'd guess they were similar in shear and tensil strength). But MAR-10 is expensive! I remember buying three six foot rounds five inches in diameter at $6500 about seven years back. The stuff was so tough that when we tried to cut it in a Makino MC the drives went into fault! Ended up cutting it on a big G&L MC that just groaned all the time it was working. I'd be afraid to run it on an Okuma lathe unless it was a big one. Tool pressure is serious. Kinda reminded me of a long day with Graphmo</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 453165, member: 25383"] I'm with you Tom! 15-5 and all the way into 18 & 19 series are steels I'm not at my best. I had some 15-5 laying around for a project, but never had the time to cut a chip. 17PH4 is one that I've done some things with, and it's an extremely strong steel, but I never was completely in love with it for an ordenance grade steel (somebody probably knows more than I do). What I found out was that 17PH4 rearc melt and MAR-10 were very similar, but with the latter being much more rust resistent. I could not see any advantage one had over the other in high heat, but others thought the MAR-10 seemed to come out with a better surviving thread form under serious heat (as I said I could see no real difference). But what I did see was a steel that fit somewhere between 330 and 349 stainless, but seemed to have a little carbon to harden. Both steel were shipped 28-32rc, but when you were cutting it you knew the difference. The shavings comming off MAR-10 were extremely hot! Was one stronger than the other? This I'd have to research again as I don't have the paperwork in front of me. (I'd guess they were similar in shear and tensil strength). But MAR-10 is expensive! I remember buying three six foot rounds five inches in diameter at $6500 about seven years back. The stuff was so tough that when we tried to cut it in a Makino MC the drives went into fault! Ended up cutting it on a big G&L MC that just groaned all the time it was working. I'd be afraid to run it on an Okuma lathe unless it was a big one. Tool pressure is serious. Kinda reminded me of a long day with Graphmo gary [/QUOTE]
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17-4 PH Stainless cut rifled barrels
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