Maybe these will help:

http://www.cknife.com/sparks.htm

http://www.marfas.com/images/metalproperties2.gif

Best Regards,
Keith Marshall


"Even if you are on the right track, you'll
get run over if you just sit there."
- Will Rogers (1879-1935).


"Brian" wrote in message
...
I have heard of a spark test. I know that I have a bar of 4340 steel, but
I
have "lost" it. I can't tell it for sure from some other stock that I
have
around. I have one bar that is still clean and bright despite the high
humidity and condensation in the shop these days so I think that may be
it,
but I have heard of a spark test - basically, the sparks from grinding are
different between different steels. Anything?

thanks, Brian