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In 1862 he exhibited in London an ingot of finest crucible steel weighing twenty-one tons.

Crystalline graphite is used principally in the manufacture of crucibles for the melting of brass, bronze, crucible steel, and aluminum.

Open hearth steel, crucible steel and blister steel, prior to this, had been the principal products, but were manufactured by processes too slow and too expensive to take the place of iron.

It was not a built-up gun, but depended on superior crucible steel for its strength.

The classifications are as follows: High-speed steel, alloy steel, tool or crucible steel, and high-carbon machinery steel.