[TheForge] Strengthening castable refractory

Wed Aug 27 13:24:00 2003

Depends what they're to be cut from, and how long the have to be.  Some
SS is fairly soft and easy to shear.  Put a large number of pieces of
this across a shear and you might could cut large numbers in little
time.  Then again, if getting the right wire and cutting it is more work
than the money, you just buy the stuff.

>>> [email protected] 08/27/03 12:28PM >>>
I am not sure that I could cut that many needles in the amount of time
that $9 would buy.

Mike Graf

Bruce Freeman wrote:

> What exactly ARE these  SS needles?  Short pieces of wire?  How
'bout
> just cutting up some SS wire, instead of paying $9/lb forSS?
>
> Bruce
> NJ
>
> >>> [email protected] 08/26/03 09:14PM >>>
> I received some technical info from Mt. Savage on the Delta t Crete
25
> insulating castable I'm about to use. In case anyone's interested
here
> are a couple of the specs:
> Density after drying:   54 lbs/ cu.ft.
> Max service temp:       2500 degF
> Therm conductivity:     1.4 BTU/Sq.Ft./Hr/degF/in. at 500 degF
>                         1.9 at 1500 degF
>                         2.3 at 2000 degF.
> Water for casting:      Approx. 55% by weight
>
> Now a question. The best way to prevent checking is to use the
minimal
> amount of water. They give an approximate amount, 55%, but how do I
> tell
> when it's enough? From what I've read on other mixes, it should be
> just
> enough to hold it together when clumping it in your hand. Does that
> sound right?
>
> My local refractory place has SS needles for $18 / 2 lb bag. Sounds
a
> little expensive, but not too expensive.
>
> Hopefully I'll get to casting this weekend. The shell is just about
> done.
>
> --
> Marc Godbout
> http://www.ironringforge.com 
>
> New England Blacksmiths Membership Director
> http://www.newenglandblacksmiths.org 
>
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