Se

1. Introduce – Selenium is a chalcogen element with atomic number 34 and symbol Se; it is a metalloid that exhibits properties intermediate between those of metals and nonmetals. – In the steel industry, selenium is commonly known as a key additive in “free-cutting steel.” – Similar to sulfur, it forms non-metallic inclusions within the metal matrix, facilitating chip evacuation during machining and significantly improving the steel’s machinability. 2. Application & Product – Free-Cutting Steel, Stainless Steel, Electronic and Optical Materials, Special Alloys...