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Measurement and AFPS control of molten steel level in strip casting

Journal of University of Science and Technology Beijing 2005年第1期12卷 16-22页

作者： LiyeZhu TihuaWu YuanFang DepartmentofAutomation ShanghaiJiaotongUniversityShanghai200030China baosteeltechnologycenter Shanghai201900China

The measurement and control of the molten steel level are studied, which affect the quality of strip surface in strip casting. A system of molten steel measurement with a CCD (Charge Coupled Devices) sensor is designed, real-time measured data are given and its precision is analyzed. The level fluctuation model is derived, and an adaptive fuzzy-PID controller with supervisory control (AFPS) is proposed. The stability of the system is proved using Lyapunov theorem, and the simulation results are given when the model, the casting speed and the roll gap change. It is suggested that this kind of coupled nonlinear and time varying system is stable and robust using the designed AFPS controller.

关键词： strip casting molten steel level CCD adaptive fuzzy-PID supervisory controller

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Characterization of Nanocrystallizatin Surface Layer of 0.4C-1Cr Low Alloy Steel Prepared by Ultrasonic Particulate Peening

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材料热处理学报 2004年第5B期25卷 1257-1259页

作者： ZHANGJun-bao LIUYu-liang ZHAOXin-qi WUJie SONGHong-wei XIONGTian-ying baosteeltechnologycenter BaoshanIron＆SteelCO.LTD.ShanghaiChina InstituteofMetalResearch ChineseAcademyofSciencesShenyangChina

A nanostructured surface layer was fabricated in a quenched and tempered 0.4C-lCr low alloy steel by ultrasonic particulate peening technique. The microstructure of the nanocrystalline surface layer was characterized by means of TEM and Mossbauer spectroscopy. Experimental results reveal that both cementite and ferrite nanocrystals with an average size of 5 nm were formed in the surface layer of the steel, phase transformation of austenite and dissolution of cementite maybe occur in the process of ultrasonic paniculate peening.

关键词：显微结构超声波喷丸处理表面毫微结晶 0.4C-1Cr低合金钢

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Low Carbon Low Alloy Submicro-Steel with Nano-Precipitates

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工程科学（英文版） 2005年第2期3卷 49-51页

作者： SongHongwei ShiBi ZhangJunbao WangXiufang baosteeltechnologycenter BaoshanIron＆SteelCo.Ltd.Shanghai201900

A submicro-steel sheet was successfully fabricated by severe warm-rolling at 773 K through a single pass. The microstructure was characterized first and the thermal stability of the submicro-steel was investigated by annealing the steel at different temperatures. Results indicate that grains are nearly equiaxial with an average diameter of 300 nm for grains near to the surface and 600 nm for grains at the center of the sheet and the submicro-steel can be subjected to annealing at 773 K without obvious grain growth. The formation of the submicro-structure can be related to a severe plastic deformation-induced grain refinement mechanism. The unusually high thermal stability can be attributed to the pinning effect of numerous uniformly-distributed nano-precipitates in the steel. The average diameter of the larger precipitates is about 30 nm and the smaller less than 10 nm.

关键词：超结晶钢纳米沉淀亚微米钢热锯

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