1. an iron alloy containing manganese and carbon, used in steelmaking
Usage: metallurgy

Examples

• The steel mill ordered several tons of spiegeleisen for the next production run.
• Spiegeleisen is added to molten iron to improve the quality of steel.
• The metallurgist explained how spiegeleisen helps remove impurities during steel production.
• German ironworks were among the first to produce high-quality spiegeleisen.
• The foundry uses spiegeleisen as a source of manganese in their steelmaking process.