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Fazer
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Case hardening
Nov 13th, 2010 at 12:27am
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I am toying with the idea of trying my hand at this. Does anyone have any suggestions on where to start looking for a furness and such. Is this something one can learn or is it all too hard.
Thanks
  
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harry_eales
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Re: Case hardening
Reply #1 - Nov 13th, 2010 at 2:45am
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Hello Fazer,

Brownells sell furnaces, and the necessary crucibles, bone and wood charcoal. They have a downloadable 'guide' as to 'how to do it'. 

However, they show no pictures of the end results they have obtained and they don't offer any guarantees on you getting results, or even they got any.  I'd be very wary of going to the temperatures recommended by Brownells they seem a tad too high for my liking.

There is a very good CC Hardening thread (22+pages) in the Marlin Collectors Website, gunsmithing section, complete with photographs of results. This really is an excellent thread and very well worth reading. See:-

(You need to Login or Register to view media files and links)

It's not cheap setting up to do CC Hardening and you will need other items of equipment than than the basic furnace, crucibles and charcoals. 

Be very aware that only a few steels can be CC Hardened, try it with the wrong steels and you have a potential grenade looking to shatter when you touch off a round.

You would need to do a lot of experimenting with various techniques, different charcoal ratio's, different temperatures, soaking times and quench temperatures before you risk working on an action that may cost $1,000,00 or more.

Harry

« Last Edit: Nov 13th, 2010 at 11:12am by »  
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38_Cal
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Re: Case hardening
Reply #2 - Nov 13th, 2010 at 11:28am
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As always, Harry gives excellent advice.  I've done hardening using the Brownells equipment and methods, and gotten good results on small parts...the case hardened Mauser bolt shrouds that they were selling were done by some of the guys in the Tech department...but as with any color case hardening, some would come out plain as a mud fence, while others were spectacular!  As the green one says, YMMV!   Cheesy

David
  

David Kaiser
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Joel Black
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Re: Case hardening
Reply #3 - Nov 13th, 2010 at 1:23pm
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I think Fazer is in Australia. Is there any place to get those supplies down there?
  
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38_Cal
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Re: Case hardening
Reply #4 - Nov 13th, 2010 at 4:13pm
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For small parts, I've packed them in ground/pulverized wood charcoal in a sealed stainless steel foil "envelope", buried in the coals of a barbecue running hot for about an hour.  Cut open the envelope and very quickly dump the entire contents into freshly agitated water.  Helps to wear heavy welding gloves and a full face shield when you're doing it!

David
  

David Kaiser
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BP
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Re: Case hardening
Reply #5 - Nov 13th, 2010 at 4:13pm
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Australia is a large cane sugar producer, so bone-charcoal should be available regionally. It is used as a filtering media during sugar refining.
  

There are three kinds of men: The ones that learn by reading, the few who learn by observation, and the rest who have to pee on the electric fence and find out for themselves.
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harry_eales
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Re: Case hardening
Reply #6 - Nov 13th, 2010 at 4:33pm
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Joel Black wrote on Nov 13th, 2010 at 1:23pm:
I think Fazer is in Australia. Is there any place to get those supplies down there?


Hello Joel,

If Fazer is 'Down Under' he may be able to obtain a kiln made for firing pottery, if Brownells can't supply him, which is unlikely, (I've bought items from them and had them sent to England) As long as a pottery kiln can reach the required temperatures, and has a thermostatic control, it should suffice. A crucible can be made in any small engineering or blacksmiths shop. 

Wood charcoal may not be a problem as long as he stays away from the BBQ brickette's that contain binders and other chemicals. Bone Char, he may have to make himself, then break the resultant burnt bone, and then seive it to size himself. The stench when preparing it  smells awfull, like leather char, when being prepared, so do it well away from the neighbours and when the wife is out for the day. lol.  Wink

Harry
  
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Fazer
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Re: Case hardening
Reply #7 - Nov 13th, 2010 at 7:09pm
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Thanks for all the help. That was quite an imformitive thread Harry. 

Yes I am in Oz, how you doing Joel. But, I know a car shipper who has containers leaving from Calf on a regular schedual. So I could load up a pallet and put it in the conatainer, if nothing surfaces here. I won't be rushing into anything as this is a hobby type thing. 

Cheers.....Chip
  
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digitall423
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Re: Case hardening
Reply #8 - Nov 14th, 2010 at 7:41am
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Fazer.
Sometime ago I experimented with color case hardening. I made my charcoal ftom the real chunk charcoal you can buy for the grill. Just grind it up a bit. The bone charcoal can be made from bone meal which is found at gardening centers. Be sure the bone meal doesn't have fillers and waxes. Most do, at least around here. Char the bone meal in the container you are going to use for case hardening. Be sure to have it slightly vented so the gasses can escape. By the way the stench has not been adequately defined in the above posts.

The container I used was about a foot of 4" schedule black pipe with a solid bottom welded on and a thread on cap on the other end. 18" pieces of 3/4" round bar was welded to both pieces as handles. Brownells container has a cap that merely slips on and fairly loosely at that.

Good luck with your experimentation. Read everything you can.
  
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FLEXPOLO
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Re: Case hardening
Reply #9 - Nov 19th, 2010 at 9:11pm
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I ADVISE IF POSSIBLE GET A KILN WITH A DIGITAL PYROMETER.i"VE BEEN CASECOLORING FOR QUITE AWHILE(AND THAT HAS CHANGED THE GAME) AND i HAVE USED BONE MEAL AND GROUND MY OWN.MY BEST RESULTS ARE WITH BROWNELLS BONE CHARCOAL(VERY HIGH IN CARBON) AS FAR AS
WOOD CHARCOAL ORGANIC CEDER MULCH WORKS THE BEST. AND HOW YOU IRRATE YOU QUENCHING WATER MAKES A BIG DIFFRENCE
I USE STONES LIKE IN AN AQUARUIM NICE SMALL CONSISTANT BUBBLES AND IRRATE FOR 4 HOURS BEFORE YOU CAN PLAY WITH ADDITIVES IN THE QUENCH( BARRUM,NITRE SALT,OILS)ALL MAKE COLORS VERY..... GOOD LUCK Grin
  
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