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Old 03-05-2016, 06:25 PM   #1
Pigi_102
 
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Default Bluing steel part.

Hi all.
Before starting my first engine build I needed a boring head, and decided to make one as per http://www.deansphotographica.com/ma...ng/boring.html

After finishing, to protect her from rusting I decided to hot blue her. Here the procedure that I hope may help someone.
I took a chunk of brass to get some swarf, mounted on the lathe and faced it "heavy" to get sligthly big swarf.
After getting enough swarf I took a metal cup and filled with parts to blue and brass swarf.
I put the cup on kitches fires until got the blu I want.
When reaching the blue I have quenched in unused motor oil.

The result is really nice, at least in my opinion.

The brass swarf are needed to get an even heating to the parts. Is mandatory to very good clean the parts as also a little point of oil or grease could end in a parte not blued ( don't ask me how I know it  )

Hope this help someone.

Pigi


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Last edited by Pigi_102; 03-05-2016 at 06:28 PM. Reason: Title fix
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Old 03-05-2016, 08:07 PM   #2
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Neat. What is your temperature & soak time recipe? And what alloy is the steel head itself?


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Old 03-05-2016, 08:43 PM   #3
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I haven't a way to measure the temperature, but according to this image attached it should be somewhere around 285/310 C

I kept the part in the cup until I've seen the blue I was looking for on the exposed side of the part.

It took something around 15/20 minutes to get there.

The material is leaded-steel alloy ( I think you call it free cutting steel ).

Pigi
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Old 03-06-2016, 01:34 AM   #4
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Great job. I'm going to file that away for future use for sure. Thanks.
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Old 03-06-2016, 05:14 AM   #5
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Are you using some sort of glueing solution? I guess I'm not sure how you lock in the blue.
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Old 03-06-2016, 06:15 AM   #6
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I have been flame coloring my rocker arms on a couple of engines with a propane torch. A little tricky on small parts as the hue can change rapidly as the temps go up in a mater of a few seconds.
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Old 03-06-2016, 06:36 AM   #7
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Quote:
Originally Posted by Wizard69 View Post
Are you using some sort of glueing solution? I guess I'm not sure how you lock in the blue.
No glueing solution, only what I told.
Take the pieces, put in brass, heat on fire till the blue, quench in oil, clean with towel or paper.

Pigi
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Old 03-06-2016, 05:54 PM   #8
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Check out "Clickspring" on Youtube He does clocks and parts.
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Old 03-06-2016, 06:45 PM   #9
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That's exactly my ispiration !

Pay attention to clickspring channel, BTW, it give dependency

Pigi
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Old 03-06-2016, 11:12 PM   #10
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Default Bluing steel part.

Quote:
Originally Posted by Pigi_102 View Post
No glueing solution, only what I told.

Take the pieces, put in brass, heat on fire till the blue, quench in oil, clean with towel or paper.



Pigi

Sorry, that was suppose to be blueing solution. Auto correct did me in - again.

This has me wondering if this is true bluing because normally you think of caustic baths to blue things.
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