42CrMo steel belongs to the ultra-high-strength steel, with high strength and toughness, good hardenability, no significant temper brittleness, quenched and tempered higher fatigue limit and anti repeated shocks, good low temperature impact toughness. Steel suitable for manufacturing large and medium-sized plastic mold requires a certain strength and toughness. 20g (Ti) is a comprehensive mechanical properties require a higher, more pure steel boiler plate, melting component composition and micro-alloying elements are more sensitive to the impact of each performance steels. 20g (Ti) Production key lies in to optimize melting ingredients, reduce the total amount of inclusions in the steel, the appropriate choice of micro-alloying elements, the use of controlled rolling, improve the quality of the board stable aging impact the application of the technology. ? 20 g technical route: → → purification ingredient quality hot metal optimized micro-alloying and refining of molten steel purification steel smelting → → protection pouring slab → Control → quality heating → temperature control rolling → plate type and plate thickness controlled cooling control → → product? http://tjdsgg.cn