The classification, properties of the domestic prehardened plastic mould steel are reviewed, the composition design and heat treatment process improvement in the chinese prehardened plastic mould steel are commented, its development direction is pointed out. Quenched and tempered prehardened steel has been developed and upgraded based on foreign steels, while non-quenched and tempered prehardened was invented by ourselves, and has been researching and developing because of its good cost performance ratio.
Study on Treatment Process Improvement of Herbal Drug Wastewater