Introduction to Basic Knowledge of Silicon Manganese Alloy Introduction to Basic Knowledge of Silicon Manganese Alloy 1. Concept: Silicon manganese alloy is an alloy composed of manganese, silicon, iron, and a small amount of carbon and other elements. It is a widely used and high-yield iron alloy. Silicon manganese alloy is a commonly used composite deoxidizer in steelmaking, and also a reducing agent for low-carbon manganese iron and electro silicon thermal production of metallic manganese in production.