Papers by Keyword: Double Cold Reduction

Abstract: The microstructure evolution during rapid induction heating process of 22MnB5 steel after double cold rolling was investigated, and the effects of deformation, heating temperature and heating rate on austenitic grain size and micro-hardness of quenched samples were discussed. The results show that the austenite begins to when heated to 850 °C and the austenite grains grow significantly when heated to 950 °C during rapid induction heating process. With the deformation increasing, the austenite grain size decreases, and the austenite grain refinement weakened when the deformation increases to a certain extent; but the influence of cold rolling on micro-hardness after quenching is not significant. In addition, there is little effect of heating rate on the 22MnB5 steel austenite with large cold deformation and a certain effect on the micro-hardness after quenching.

Abstract: The setting goals of process lubrication were not all-inclusive in the previous manufacturer of double cold reduction. Strip shape, surface quality, the fuel consumption of unit and rolling stability could not be considered comprehensively. Aimed at the equipment and production craft characters of double cold reduction unit, at the basis of putting forward the comprehensive control index of a strip-shaped fuel consumption cleanliness for the first time, ensuring the shape quality of strip, lowering the oil residue on strip surface, improving the cleanliness of strip surface and reducing fuel consumption were defined as control targets; besides, the control of slip and heat-scratches were defined as constraints. A complete comprehensive optimization technology of process lubrication regime was established and has been applied to a 1220 double cold reduction unit belonging to Baosteel in China. Rolling speed, surface quality and strip shape quality are improved effectively, and oil consumption is reduced, meanwhile, the productivity and rolling yield of unit are ensured. This technology has created economic benefits for domestic steel makers and has further extended application value.

Abstract: In recent years, the double cold reduction material (DR material) was developed rapidly with the increase of industry market of computer, mobile telephone, household electrical appliances and pop canning and so on. The DR material has its characteristics such as very thin specification, strong intensity, high flatness and surface quality. In China, only Baosteel has ability to produce with the double cold reduction (DCR) technology. In this paper,based on the five years research and production Practice since 2004, the experimental study, production commissioning and product performance optimization methods in Baosteel have been discussed, such as the mode choice, roll gap lubrication system as well as the control method, the actual production operation and technology parameter set and so on ,so as to promote the development and progress of DR material production. It offers beneficial reference for the technologist on the spot.