fire bluing screw heads
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Old 08-22-2010, 04:44 AM   #1
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Default fire bluing screw heads

i have been trying to fire blue some screw heads, while i have had success with getting them very dark that is not my intention. I want to get that brilliant blue. i don't know if i am over heating them or perhaps i am not heating them enough. Any advice on the matter would be appreciated.
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Old 08-22-2010, 12:38 PM   #2
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G'day mate.
Try heating them to a dull cherry red. When i say dull i mean only just red, need to hold them in the shade to see the red. Hope this helps you achieve the result.
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Old 08-22-2010, 01:25 PM   #3
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Heat slowly to a beep blue, then quickly quench in oil. If you go past blue when heating, quench and start again..

Jim..........
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Old 08-22-2010, 03:02 PM   #4
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You are getting them too hot. For that bright fire blue, polish to a mirror
finish, and heat carefully. You are only going a little past 500 F. It
comes on FAST if you are trying to use a torch.

Some toaster ovens will do it, or a good heat gun. I used to just toss the screws on top of a wood stove and stoke up the fire a bit. When
they get to the right color quench them quickly.

Color chart here: Blue Blade Steel spring - steel, hardened and tempered steel, annealed
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Old 08-22-2010, 07:45 PM   #5
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Agree. Polish head, try holding the shank in a pair of needle nose, and heat the shank, watching the head- small parts heat REALLY fast. When you are ALMOST there, get ready to drop into a small cup of oil. Have used 30 W motor oil, linseed oil- but never tried olive oil (maybe for a Carcano? )
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Old 08-22-2010, 08:21 PM   #6
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Quote:
Originally Posted by c3shooter View Post
Agree. Polish head, try holding the shank in a pair of needle nose, and heat the shank, watching the head- small parts heat REALLY fast. When you are ALMOST there, get ready to drop into a small cup of oil. Have used 30 W motor oil, linseed oil- but never tried olive oil (maybe for a Carcano? )
You may want to consider wrapping your needle nose with a wet rag and let the wet rag act as a heat sink. The grip can get a little warm.

Harbor Freight has some long handled needle nose pliers that can help (and they are cheap enough that you can dispose of them after changing their temper)
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Old 08-23-2010, 12:00 AM   #7
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i thank you for your reply someone said i should see a straw color and then wait for it to turn blue but it doesn't all it does is get red. i have also quenching in linseed oil as i am told it offers protective properties, i will try again and try to heat it slower if no luck i will buy some nitrate blue from brownells and do it that way
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Old 08-23-2010, 12:49 AM   #8
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For knife blades I like peanut oil for quenching. It's very light and transfers heat quickly.
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Old 08-23-2010, 04:28 PM   #9
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for flat springs I have polished them and then I put them on the burrner of the stove ( electric). when they hit the right colour I quench in a sutable oil.
Dont put the burrner on max just till you can reach the right temp.
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