[TheForge] Trenton ID

[Jerry Frost]

Morning Bob:

The reason pre/post heat is not recommended for hardfacing crusher drums,
etc. is because high manganese steels have a limited heat/time
characteristic. After a specific amount of heat and time exposure (there are
charts as it depends on alloy) high manganese steels tend to fail
catastrophically. Crusher drums are hardfaced nearly submerged in water
baths with only the narrow path of the bead above water to limit heat/time
exposure.

The higher the manganese content the lower the threshold temperature, some
are as low as 300f if I recall correctly. A drum may survive many hours at
300f before failing but also may only survive a few minutes or seconds at
1,500f. Specific info requires the chart for the specific alloy.

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

>
> Maybe the steels that are used for rock crushing equipment is not as
> prone to
>   cracking as an anvil made of two separate kinds of material...face and
> body as a
>   Trenton.
>
> Personally I would be inclined to preheat and postheat.
>
> But that's just me.
>
> Bob
> ___
>
>
>
> On Tuesday, April 6, 2004, at 02:09  PM, Dan Tull wrote:
>
> > The best spec says NO PRE-HEAT/ POST-HEAT!
> > That was enough for me.
> > It is a " highest impact " rod used in the rock crushing industry.
> >  Peen and work harden.  Excellent for tool to mild.
> > I don't get a very good color match after rust as this is a high
> > manganese
> > rod.
> > AC/DC   150 amp. tight arc.
>