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Rifles, Reloading, Optics, Equipment
Gunsmithing
Nitride Coater
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<blockquote data-quote="Trickymissfit" data-source="post: 1372466" data-attributes="member: 25383"><p>I have not been around liquid salt heat treating in a long time (thank God), but it melts at 1460 degrees if memory is right (at least 1200 degrees). The quench is via 65 to 75 degree water that is agitated via circulation pumps. In an intricate part like a rifle bolt, I'd expect some warpage, and worse yet a serious amount of shrinkage in the part (perhaps five to eight thousandths). The shock of the quench could induce cracks in sharp corners (under .025" radius).</p><p></p><p>To the OP: nitriding and salt color bath are completely different animals. One is for case hardening, and one will color a piece of steel to a pretty blur or even a straw color. Depending on the time in the liquid salt. There are several Nitride processes out now, with plasma being the most popular. When you submerge the bolt in the salt bath, you immediately start the draw process (one of the reasons it was developed). You do not want that! </p><p></p><p>What you can do:</p><p>1. have the bolt body TIN coated (better anyway)</p><p>2. have the bolt body black chromed</p><p>3. just have it blued like the gun</p><p></p><p>most other processes require machine work</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 1372466, member: 25383"] I have not been around liquid salt heat treating in a long time (thank God), but it melts at 1460 degrees if memory is right (at least 1200 degrees). The quench is via 65 to 75 degree water that is agitated via circulation pumps. In an intricate part like a rifle bolt, I'd expect some warpage, and worse yet a serious amount of shrinkage in the part (perhaps five to eight thousandths). The shock of the quench could induce cracks in sharp corners (under .025" radius). To the OP: nitriding and salt color bath are completely different animals. One is for case hardening, and one will color a piece of steel to a pretty blur or even a straw color. Depending on the time in the liquid salt. There are several Nitride processes out now, with plasma being the most popular. When you submerge the bolt in the salt bath, you immediately start the draw process (one of the reasons it was developed). You do not want that! What you can do: 1. have the bolt body TIN coated (better anyway) 2. have the bolt body black chromed 3. just have it blued like the gun most other processes require machine work gary [/QUOTE]
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Nitride Coater
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