Development of Non-Quenched Prehardened Steel for Large Section Plastic Mould  

作　　者：LUO Yi WU Xiao-chun MIN Yong-an ZHU Zhu WANG Hong-bin 

机构地区：[1]School of Material Science and Engineering, Shanghai University, Shanghai 200072, China

出　　处：《Journal of Iron and Steel Research International》2009年第2期61-67,共7页

基　　金：Item Sponsored by Shanghai Leading Academic Discipline Project (T0101)

摘　　要：In order to meet the demand of prehardened steel for large section plastic mould and save energy, a nonquenched prehardened （NQP） steel is developed. The temperature field of a large block is researched by finite element method simulation and 9 test steels are designed in the laboratory. Their microstructures and hardness are investigated when they are air cooled and control cooled at cooling rate similar to the simulation. The result shows that the hardness uniformity through section is closely correlated to bainitic hardenability for the NQP steel, and the hardness of one test steel （0.27C-1.95Mn-1.04Cr-0.45Mo-0.1V） fluctuates between HRC 40 and 43 under both cooling conditions. The test steel has better machinability compared with C45 steel, and the NQP steel is produced successfully in the factory based on the laboratory results. Its microstructure is bainite, and it is distributed uniformly through the size of 460 mm×800 mm×3 200 mm.In order to meet the demand of prehardened steel for large section plastic mould and save energy, a nonquenched prehardened （NQP） steel is developed. The temperature field of a large block is researched by finite element method simulation and 9 test steels are designed in the laboratory. Their microstructures and hardness are investigated when they are air cooled and control cooled at cooling rate similar to the simulation. The result shows that the hardness uniformity through section is closely correlated to bainitic hardenability for the NQP steel, and the hardness of one test steel （0.27C-1.95Mn-1.04Cr-0.45Mo-0.1V） fluctuates between HRC 40 and 43 under both cooling conditions. The test steel has better machinability compared with C45 steel, and the NQP steel is produced successfully in the factory based on the laboratory results. Its microstructure is bainite, and it is distributed uniformly through the size of 460 mm×800 mm×3 200 mm.

关 键 词：NQP steel large section plastic mould temperature estimation chemical composition MICROSTRUCTURE MACHINABILITY 

分 类 号：TG142[一般工业技术—材料科学与工程] TQ320.52[金属学及工艺—金属材料]