On Apr 6, 12:34*am, "William Longyard"
wrote:
Can anyone tell me the weight of a steel slab that is 3/4" x 31.5" x 42" ?

Thanks,
Bill

A steel plate one foot square and one inch thick weighs 40 lbs, for
most practical purposes. Sometimes it's specified by that rule; your
piece is 30 Lb plate. It's a handy way to estimate the cost of a piece
in a scrapyard.

The exact density depends on alloy and carbon content.

Jim Wilkins