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TOPIC: re-tempering spring steel.

RE:re-tempering spring steel. 01 Dec 2010 05:18 #16

ray tyron wrote:
Old timers heated the spring in molten lead until chery red on a wire then quinched it in oil. Then placed it in can of oil and heated can until oil hit its flash point. catches fire . Then cover can and let cool. I have had good luck with olive oil. Heat it up a little befor u quinch or it may crack. U don't need lead if u have a way to heat it slow and even but if u do use lead be careful. molten lead is dangerous and the fumes are toxic. do it out side. u may need to re bend spring a little. And clean off lead before u temper. If u found a spring to replace it u will not loose anything trying it personally I would not use water as a quinch cools to fast for springs. but what ever u use keep it moving as it cools. Bubbles create a hot spot that will crack. Good luck be safe and good hunting

Good stuff Ray. Thanks for the reply.
Matthew Kornegay.

"The beast in me is caged by frail and fragile bars." -
-- Johnny Cash
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RE:re-tempering spring steel. 20 Oct 2011 12:48 #17

I think you are only getting part of the process.First heat the part red hot and allow to cool slowly(air temp)this will soften the spring so it can be re-shaped to original shape.then re-harden by heating to cherry red and quenching in oil/water best to drop the peice in so it can cool evenly.Part will be very hard now but also very brittle,now comes the tempering part.There are a few ways to do this,motor oil will work place the part in a cut down can or what you have that will withstand 700F heat the oil (not the part)untill the oil burns away and part should be good.2 lead melts at about 700F heat lead and keep submerging part untill lead no longer sticks to it,it should have acheived temp then.Also most self cleaning ovens clean at about 700F just throw it in and run cycle.This process may not work perfectly for every spring out there but should work fine for most spring steel that is in the .3%-.7% carbon range.Hope this works for you,many years of fun with your gun.
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RE:re-tempering spring steel. 30 Oct 2011 04:26 #18

Thanks, I hadn't messed with that old gun much since last winter. I got out my winter coat the other day and found a piece of spring steel off a broken spring on a drill press. I picked it up last year and its almost perfect for the gun just needs to be flattened and a hole drilled in the end. I will check back with this thread when I get a chance to work on it. Thanks again.
Matthew Kornegay.

"The beast in me is caged by frail and fragile bars." -
-- Johnny Cash
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