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Nitre bluing step by step.

calebibcalebib Senior MemberPosts: 1,701 Senior Member
I was finishing up a rifle build today (which I will start another post about) and I needed to nitre blue a few parts so I thought I take a few pics and show you all the process. It's actually very easy though not without some risk.

The first step is polishing the parts. To be blued today was a steel grip cap, some action screws, bolt stop screw and the bolt stop cover. I wanted a fairly bright finish so I polished them to 600 grit. The screws got spin polished in a drill and the cover and grip cap were hand polished up to 600 then finished up on the buffer.

Sorry for the blurry pics.

Hand polishing.
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Buffer polishing.
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The parts then get hung from a piece of thin wire and degreased.
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The nitre salts are then heated up to between 575 and 650 degrees.
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The part is then suspended in the molten salts until the desired color is achieved. You can get a range of colors including the straw color found on Lugers and the like.
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The part is then quenched in water. Care must be taken to ensure you don't get any water in the molten salts, that is unless you want a 600 degree mini volcano.
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Dry it off and give it a coat of oil and you're done!
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