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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Melonite barrel treatment
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<blockquote data-quote="Pdvdh" data-source="post: 956516" data-attributes="member: 4191"><p>I don't think it's an issue. If the barrel steel will survive -50F use without Melonite treatment, it should also survive use in those temperatures with Melonite treatment. </p><p></p><p><a href="http://www.burlingtoneng.com/melonite.html" target="_blank">Melonite Processing</a></p><p></p><p>""<strong>Melonite Processing: Melonite QPQ</strong></p><p></p><p>Melonite™ and Melonite QPQ™ are thermochemical processes intended for the case hardening of iron based metals. These processes are categorized as molten salt bath ferritic nitrocarburizing. During these processes, nitrogen, carbon, and small amounts of oxygen are diffused into the surface of the steel, creating an epsilon iron nitride layer (e - FexN).</p><p></p><p>A degraded form of this nitride layer (gamma prime: g' - Fe4N) is obtained during plasma or gas nitriding. The nitride layer is composed of two principle zones. Zone 1, called the compound or "white" layer, extends to a case depth of ~0.0004" to 0.0008". The compound layer is porous, which lends to the lubricity of the finish, and hard (~700HV to 1600HV). Zone 2, called the diffusion zone, extends to a case depth of ~.004" to 0.008".</p><p></p><p>In addition, small quantities of substrate carbon are pulled from deeper within the substrate toward the surface. The diffusion zone demonstrates a decreasing gradient concentration of carbon and particularly nitrogen as the gradient extends deeper into the surface of the substrate. This property yields a tough outer surface or shell, <strong>yet allows the material to retain ductility</strong>, thereby lending to the overall strength of the material.""</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 956516, member: 4191"] I don't think it's an issue. If the barrel steel will survive -50F use without Melonite treatment, it should also survive use in those temperatures with Melonite treatment. [url=http://www.burlingtoneng.com/melonite.html]Melonite Processing[/url] ""[B]Melonite Processing: Melonite QPQ[/B] Melonite™ and Melonite QPQ™ are thermochemical processes intended for the case hardening of iron based metals. These processes are categorized as molten salt bath ferritic nitrocarburizing. During these processes, nitrogen, carbon, and small amounts of oxygen are diffused into the surface of the steel, creating an epsilon iron nitride layer (e - FexN). A degraded form of this nitride layer (gamma prime: g' - Fe4N) is obtained during plasma or gas nitriding. The nitride layer is composed of two principle zones. Zone 1, called the compound or "white" layer, extends to a case depth of ~0.0004" to 0.0008". The compound layer is porous, which lends to the lubricity of the finish, and hard (~700HV to 1600HV). Zone 2, called the diffusion zone, extends to a case depth of ~.004" to 0.008". In addition, small quantities of substrate carbon are pulled from deeper within the substrate toward the surface. The diffusion zone demonstrates a decreasing gradient concentration of carbon and particularly nitrogen as the gradient extends deeper into the surface of the substrate. This property yields a tough outer surface or shell, [B]yet allows the material to retain ductility[/B], thereby lending to the overall strength of the material."" [/QUOTE]
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Melonite barrel treatment
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