Day: July 25, 2021

Improving the cleanliness of the cast slab is the basis for the production of high-quality steel, and the total oxygen content of the cast slab is an important measure of the cleanliness of the molten steel. Reducing the total oxygen content of the cast slab is mainly carried out from three aspects: converter process, refining … Read more

 1.1 Overview In 1958, H.F. Shroyer invented the technology of making metal castings with expandable foam plastic models and obtained a patent. The model used at first was made of polystyrene (EPS) board and molded with sand containing binder. The German companies Grunzweig and Harrtmann purchased this patent and developed and applied it. The technology … Read more

   Generally, clean steel refers to a steel grade that has a low content of five major impurity elements (S, P, H, O, N) in steel, and strictly controls non-metallic inclusions (oxides, sulfides) in the steel. The general measures to reduce the content of [H], [O] and [N] in steel include: 　　1, [H] content 　　(1) … Read more