[modeleng] Re: Indentation hardness testing
- From: "Peter J. Cathcart" <peter.cathcart@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 13 Dec 2006 17:16:55 -0000
Jeff
It's plate steel so pretty tough already. I'll try the oil, sounds fun and
I bet it stinks!
Thanks
Peter
----- Original Message -----
From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, December 13, 2006 1:04 PM
Subject: [modeleng] Re: Indentation hardness testing
Substitute HSS for it, or have it hardfaced at a welding shop, if you want
to be sure to win!
Is it mild steel or tool steel? oil hardening or water hardening if tool
steel?
If unknown, I would test it by heating to bright red, followed by a water
quench (turbulent brine preferably) and don't temper it afterward. If it is
good tool steel, either oil or water hardening, after the water quench it
should be dead hard, ie 60-65 Rc. You shouldn't be able to scratch it with a
file.
If it is mild steel or iron, it won't harden with this treatment, and your
best bet then is to case harden with Kasenit or equiv., several treatments
of it to ensure a deep case.
Cheers Jeff Dayman
----- Original Message -----
From: "Peter Cathcart" <peter.cathcart@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, December 13, 2006 6:52 AM
Subject: [modeleng] Indentation hardness testing
> We have a meeting at IDSME on Friday evening and the topic is as above.
> Peter Pardington who is giving the talk, and bringing along the equipment,
> has given a number of us a small block of metal and asked us to go away
and
> harden it for testing. Anyone any thoughts on the best way to make it as
> hard as possible so I beat everyone else?
>
> Peter Cathcart
>
>
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