cementation

If the cementation be continued too long, the steel acquires a darkish fracture, it is more fusible, and incapable of welding.

It is conveyed into reservoirs containing pieces of old iron; the sulphate is thus decomposed into copper of cementation.

It is covered with black blisters, like steel of cementation; whence it has got the name of blistered copper.

This is an easy way of making cast-steel without previous cementation of the iron.

By a blast so tempered at the beginning, the ore gets well calcined, and partially reduced in the way of cementation.