Metallurgical waste slag refers to various solid wastes generated in the production process of the metallurgical industry.

​Scrap rails refer to railway rails that cannot be used due to wear or aging during use. These rails can usually be reused after strict inspection and necessary repair.

Scrap steel includes scrap steel, scrap iron, metallurgical waste slag, oxidized waste, alloy scrap steel, stainless scrap steel, etc., which is a general term for ferrous metal waste.

Scrap stainless steel refers to metal that is used for reprocessing in the furnace. Its main sources are stainless steel waste generated by industrial manufacturing and stainless steel technology, stainless steel equipment that is damaged and scrapped due to long-term use, and stainless steel utensils used in daily life.