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| Torch bluing https://www.airgunforum.ca/forums/topic61623.html |
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| Author: | joe hickey [ Wed Apr 02, 2014 3:18 pm ] |
| Post subject: | Torch bluing |
I was experimenting with torch bluing today. I found it very difficult to get a uniform color. Then I stumbled upon a method that seem,s promising. I heated the tube past the blue stage to the light blue/gray stage. This is what I got after dipping it in oil.   That is the most uniform color and the nicest color I got all day. |
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| Author: | blarg [ Wed Apr 02, 2014 3:37 pm ] |
| Post subject: | Re: Torch bluing |
Isn't this case hardening rather then bluing? That is, not a magnetite coating, but a carbon coating. http://en.wikipedia.org/wiki/Bluing_%28steel%29 |
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| Author: | paddyfritz [ Wed Apr 02, 2014 4:45 pm ] |
| Post subject: | Re: Torch bluing |
joe hickey wrote: I was experimenting with torch bluing today. I found it very difficult to get a uniform color. Then I stumbled upon a method that seem,s promising. I heated the tube past the blue stage to the light blue/gray stage. This is what I got after dipping it in oil. That is the most uniform color and the nicest color I got all day. Nice. I think it works best for small parts. Have you thought about rust bluing ? |
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| Author: | joe hickey [ Wed Apr 02, 2014 6:13 pm ] |
| Post subject: | Re: Torch bluing |
paddyfritz wrote: joe hickey wrote: I was experimenting with torch bluing today. I found it very difficult to get a uniform color. Then I stumbled upon a method that seem,s promising. I heated the tube past the blue stage to the light blue/gray stage. This is what I got after dipping it in oil. That is the most uniform color and the nicest color I got all day. Nice. I think it works best for small parts. Have you thought about rust bluing ? I don't like the brownish color of rust bluing. The only reason I wanted to try torch bluing is it,s more rust and scratch resistant than cold blue chemical. I don't think I would like to attempt a larger piece though. |
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| Author: | rrdstarr [ Wed Apr 02, 2014 6:16 pm ] |
| Post subject: | Re: Torch bluing |
joe hickey wrote: paddyfritz wrote: joe hickey wrote: I was experimenting with torch bluing today. I found it very difficult to get a uniform color. Then I stumbled upon a method that seem,s promising. I heated the tube past the blue stage to the light blue/gray stage. This is what I got after dipping it in oil. That is the most uniform color and the nicest color I got all day. Nice. I think it works best for small parts. Have you thought about rust bluing ? I don't like the brownish color of rust bluing. The only reason I wanted to try torch bluing is it,s more rust and scratch resistant than cold blue chemical. I don't think I would like to attempt a larger piece though. When I was a full time gunsmith I did it on small parts. Worked great! |
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| Author: | Gippeto [ Wed Apr 02, 2014 6:56 pm ] |
| Post subject: | Re: Torch bluing |
joe hickey wrote: I don't like the brownish color of rust bluing Does this seem brownish to you?   Your tube looks GREAT in the pics btw. 
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| Author: | joe hickey [ Wed Apr 02, 2014 7:03 pm ] |
| Post subject: | Re: Torch bluing |
Gippeto wrote: joe hickey wrote: I don't like the brownish color of rust bluing Does this seem brownish to you? Your tube looks GREAT in the pics. I like the look in your picture, but according to the info I researched, rust bluing is supposed to give a brownish black finish like turn of the century fire arms. I wanted a shiny blued look. |
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| Author: | paddyfritz [ Wed Apr 02, 2014 7:41 pm ] |
| Post subject: | Re: Torch bluing |
joe hickey wrote: Gippeto wrote: joe hickey wrote: I don't like the brownish color of rust bluing Does this seem brownish to you? Your tube looks GREAT in the pics. I like the look in your picture, but according to the info I researched, rust bluing is supposed to give a brownish black finish like turn of the century fire arms. I wanted a shiny blued look. Only if you are browning the part. If you rust blue it, the conversion process changes the rust brown to a very deep blue like on a nice weatherby. Rust bluing is the true proper way of bluing, hot bluing is the cheap commercial way. |
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| Author: | Jon [ Thu Apr 03, 2014 10:58 am ] |
| Post subject: | Re: Torch bluing |
There a various methods in the proper word 'Browning' often call blacking or blueing, same thing. Generally these days theres only hot and cold blacking, used to do both. Cold blacking is for quality guns at sub 150 degrees else the barrels will come apart! In a hot blacking process its the mix and or temp that's wrong if it comes out brown, likewise could come out green. Back to the OP you need a very controlled heat, 2 degrees either way its a different colour and of course heat rises. You have gone through the colour spectrum there probably 20 degrees too much at 300 degrees. The key is an even heat displacement and takes some doing. ie 22 years ago my Diana 52 barrel sleeve and silencer (ok I am a Brit) took no less than 9 attempts on one and 11 on the other part to get presentable with a blow torch. Each time polished off the carbon. Done several and not worth the effort involved plus it alters the metallurgy of the steel. |
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| Author: | rrdstarr [ Thu Apr 03, 2014 5:15 pm ] |
| Post subject: | Re: Torch bluing |
When I gunsmithed I did it with bluing salts, only once in school did I rust blue and old Parker side-by-side shotgun that was soldered together. Made me very nervous!!! |
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| Author: | EverHopeful [ Thu Apr 03, 2014 9:53 pm ] |
| Post subject: | Re: Torch bluing |
I looked up rust bluing - that sure looks like a labour of love, repeating the process over and over again. That looks like a good result with the torch bluing Joe - must be pretty intimidating plunging the hot metal into oil  Jim |
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| Author: | joe hickey [ Fri Apr 04, 2014 4:47 am ] |
| Post subject: | Re: Torch bluing |
Not really. The residual oil in the piece, barely catches fire only when the torch touches it. Duunking in warm oil doesn, t even produce smoke. If it were red hot, I would be wary. |
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| Author: | Daryl [ Fri Apr 04, 2014 12:34 pm ] |
| Post subject: | Re: Torch bluing |
The process Joe used seems to me, is also called charcoal bluing. Done correctly, the finish is beautifully deep, shiny blue - not black or blackish - fire-blue, like a brand-spanking new 1851 Navy Colt. Unfortunately, this finish, while quite beautiful, is not very wear resistant, just like fire-blued screw heads. Joe's finish's colour looks very similar to rust blue - in the pictures. Perhaps that is due to the oil bath? Al is correct in that rust blueing is the ORIGINAL blueing of the 18th and 19th century. Caustic salts blueing as used today by those gun smith's who blue rifle parts to get the typical black finish (called bluing), is totally modern - well, post 1900 I'm sure. |
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