Development of non-quenched prehardened steel for large section plastic mould
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In order to meet the demand of prehardened steel for large section plastic mould and save energy, a non-quenched 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×3200 mm.
Key wordsNQP steel large section plastic mould temperature estimations chemical composition microstructure machinability
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- 1.CHEN Zai-zhi, MA Dang-shen. Plastic Mould Steel Application Manual [M]. Beijing: The Chemistry Industry Press, 2005 (in Chinese).Google Scholar
- 2.LUO Yi, WU Xiao-chun. Research Progress of the Work on Prehardened Plastic Mould Steel [J]. Heat Treatment of Metals, 2007, 32(12): 22 (in Chinese).Google Scholar
- 3.SONG Dong-li, GU Jian-feng, ZHANG Wei-min, et al. Numerical Simulation on Temperature and Microstructure During Quenching Process for Large-Sized AISI P20 Steel Blocks Used as Plastic Die [J]. Transactions of Materials and Heat Treatment, 2004, 25(5): 740.Google Scholar
- 4.WU Xiao-chun, ZHANG Jie, CUI Kun. The Microstructure and Mechanical Properties of Unquenched and Untempered Die Steel for Plastic Mould [J]. Journal of Huazhong University of Science and Technology, 1995, 23(12): 1 (in Chinese).Google Scholar
- 5.JIANG Lai-zhu, WANG Jiang-hui. Development of a Non-Quenched Non-Tempered Bainitic Steel for Plastic Mould: Continuous Cooling Transformation Behavior [A]. Jeglitsch F, Ebner R, Leitner H, eds. Proceedings of the 5th International Conference on Tooling [C]. Leoben: 1999. 685.Google Scholar
- 6.SONG Dong-li, GU Jian-feng, PAN Jian-sheng, et al. Design of Quenching Process for Large-Sized AISI P20 Steel Block Used as Plastic Die [J]. Journal of Materials Science and Technology, 2006, 22(1): 139.Google Scholar
- 7.LIU Zhuang, WU Zhao-ji, WU Jing-zhi, et al. Numerical Simulation of Heat Treatment [M]. Beijing: Science Press, 1996 (in Chinese).Google Scholar
- 8.Pickering F B. Physical Metallurgy and the Design of Steels [M]. London: Applied Science Publishers LTD, 1978.Google Scholar
- 9.Vetter P, Hippenstiel F. A New Pre-Hardened Plastic Mould Steel as a Tailored Solution for Large Moulds [A]. Rosso M, Actis Grande M, Ugues D, eds. Proceedings of the 7th International Conference on Tooling [C]. Torino: 2006. 317.Google Scholar