spiegeleisen

An alloy of iron containing approximately 15 percent manganese and small quantities of carbon and silicon, used in the Bessemer process.

A pig-iron containing from eight to fifteen or more per cent. of manganese.

See spiegel iron.

A ferromanganese alloy containing approximately 15% manganese and small quantities of carbon and silicon.

pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel