The steel having melted, it is then poured into moulds : and is, afterwards finished, by ham- mering, and rolling.

528 Cast steel is excellent, for cutting instruments ; but, unlike the other kinds it cannot without being altered in con- stitution, and deteriorated be joined, by welding, to iron, 529 Steel combines with other metals.

It is greatly im- proved, by the 500th of its weight, silver.

If it contains the 100th part of its weight, platinum, it is not so hard as that, made with silver : but it is more tough.

Steel combines with gold, &c.