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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: 452761" data-attributes="member: 25383"><p>finally somebody got it right about just how junky 416 stainless is! But you did leave out the fact that it's a "high retained martensite steel" as well. This one of the main reasons 416 is not recommeded for use in extreme cold weather. One thing to keep in mind about 17PH4 rearc melt steel is that it will rust! If it will harden (with one known exception), it also will rust. The exception is MAR-10. MAR-10 is stronger than 416, and comes shipped with a 28-32 rc (you may be able to order at a higher hardness). Machines slightly tougher than 416, but I'd say it's similar to 420 in machinability. The stuff is so rust resistant that you can put a block of it in deionized water for six weeks with no sign of rust (416 is usually about 3 or 4 days)</p><p> </p><p> So far most folks shy away from 17PH4 due to it's machining qualities, and tooling is closely guarded. So good luck to you! P.S. the stuff is kinda hard on equipment, and a Jap lathe rarely comes back after a good wreck machining the stuff. Also did do any investigation into the newer 500 series? I never did any work with that one, but the paper work looks very interesting.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 452761, member: 25383"] finally somebody got it right about just how junky 416 stainless is! But you did leave out the fact that it's a "high retained martensite steel" as well. This one of the main reasons 416 is not recommeded for use in extreme cold weather. One thing to keep in mind about 17PH4 rearc melt steel is that it will rust! If it will harden (with one known exception), it also will rust. The exception is MAR-10. MAR-10 is stronger than 416, and comes shipped with a 28-32 rc (you may be able to order at a higher hardness). Machines slightly tougher than 416, but I'd say it's similar to 420 in machinability. The stuff is so rust resistant that you can put a block of it in deionized water for six weeks with no sign of rust (416 is usually about 3 or 4 days) So far most folks shy away from 17PH4 due to it's machining qualities, and tooling is closely guarded. So good luck to you! P.S. the stuff is kinda hard on equipment, and a Jap lathe rarely comes back after a good wreck machining the stuff. Also did do any investigation into the newer 500 series? I never did any work with that one, but the paper work looks very interesting. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
17-4 PH Stainless cut rifled barrels
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