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Source for case hardening powder

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brian NYE17/07/2017 13:30:51
8 forum posts

need to do some case hardening on mild steel bar. any one know where I can purchase a tin ?

 

Edited By JasonB on 17/07/2017 14:08:47

Thor17/07/2017 14:26:06
1276 forum posts
39 photos

Haven't tried it myself but here is one supplier, and another. The subject was discussed here. You should be able to use a steel tube as a "tin".

Thor

 

Edited By Thor on 17/07/2017 14:28:36

not done it yet17/07/2017 16:01:41
5017 forum posts
20 photos

Make your own?

Watch one of the latest 'clickspring' videos where he case hardens from scratch, like Egyptians may have done it.

Cheap, cheerful and apparently effective.

Rik Shaw17/07/2017 18:48:51
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1365 forum posts
373 photos

Clive our resident beekeeper on here advocates scraps of old leather to get the job done. I have not tried it yet but bought a huge quantity from a car boot sale a while ago ready for when I do.

Rik

Mark P.17/07/2017 18:54:42
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615 forum posts
8 photos
Some on ebay.
Mark P
MW17/07/2017 18:54:59
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2051 forum posts
51 photos

I'll just touch on methodology here, because I think everyone does it slightly differently but this is how I "understand it".

Heat the part up til it reaches a dull to mid red colour.

then just bury it in the case hardening compound (whatever that you may wish to be).

leave it til cools in the compound then re do this another 2 times so that it has had 3 sittings in the powder. The caked on carbon starts to burn quite brightly on the successive coats.

On the last heating, quench in cold water when it reaches red again. Vigorously shake it in the water after plunging.

Does anyone use abrasive papers at the end, to cosmetically rid of the excessive black bits? 

Michael W

Edited By Michael-w on 17/07/2017 18:57:03

larry Phelan17/07/2017 22:00:46
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544 forum posts
17 photos

I seem to remember buying some of that powder from Chronos some years ago,not sure if they still sell it.

Never really made much use of it.

duncan webster17/07/2017 22:05:27
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2795 forum posts
41 photos

Bone dust, which used to be a bi product of button making, but seriously anything high in carbon will have some effect, I've seen sugar suggested. The bought in stuff is more reliable and easier to use

Ian Skeldon 217/07/2017 22:13:17
489 forum posts
41 photos

It could very well be old age dulling my memory but I (think) I remember case hardening components which were placed into a cement/ceramic type box filled with carbon and charcole and then a lid on top. Whole thing placed inside a large (industry type) oven and baked for about 12 hours. I do remember for sure that we would take a sample every now and then and test it's surface hardness and then cut through it to measure the depth of hardning.

Mark Rand18/07/2017 00:50:09
922 forum posts
6 photos

Add a bit of barium carbonate to the mix if you go "home brewed". It'll work far better that way.

Howard Lewis18/07/2017 08:12:12
3608 forum posts
2 photos

Some years ago, I bought some from Chronos.

Might be worth checking if they still sell it.

Howard

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