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North heavy industry steel casting company successfully trial produced steel ingots with high height diameter ratio

North heavy industry steel casting company successfully trial produced steel ingots with high height diameter ratio

China Construction machinery information

the height diameter ratio of traditional steel ingots produced by the steel casting branch of casting and forging company is generally in the range of 1.8 to 2.5, the appearance is short and thick, the ingot yield is about 85%, and the current market share has gradually declined. In order to optimize the product structure, improve the utilization rate of steel ingots, and expand the market share of steel ingots, since the beginning of the year, the cast steel branch has actively cooperated with Shenyang Metal Research Institute to develop steel ingots with large height diameter ratio, and recently successfully trial produced 14T steel ingots with 42CrMo material and 6.0 height diameter ratio

because the production of steel ingots with high aspect ratio in China has been in the exploratory stage, there are few production examples and experiences that can be used for reference. The increase of the height diameter ratio of the ingot will make the ingot prone to crack, segregation, shrinkage cavity and other defects in the solidification process. There are also a series of technical problems in pure purification smelting, smooth pouring, molten steel self feeding and so on

in order to solve the demand for lithium cathode materials such as high nickel and solve a series of technical problems safely, cast steel branch has devoted itself to research and bold innovation. Smelting: according to the previous smelting experience, ensure the oxidation and dephosphorization of molten steel within 1580 ~ 1590 ℃, and the reduction and desulfurization within 1640 ~ 1645 ℃, operate all the chemical components according to the medium limit and ensure their uniformity, and increase the tapping temperature by 70 ℃ at the melting point, so as to prevent defects from smelting. Pouring technology: in view of the long pouring time of fine and high steel ingots, the cooling of exposed steel surface and serious surface oxidation, the technical backbone of the branch and relevant personnel of the metal Institute carefully analyzed, repeated tests and discussions, and finally proposed the pouring method of argon protection. The solidification of molten steel is simulated by ProCAST software, and the simulation results further confirm the feasibility of the above scheme. After determining the process plans, the technology department and the production department jointly organized the production technology review meeting, systematically reviewed the process planning and production arrangement, and carefully discussed the control points of each detail to ensure the smooth production of high aspect ratio ingots. In the process of organizing production, the leaders of the branch company invited relevant personnel of the Metal Research Institute to provide on-site guidance, and the process personnel held a night of R & D team activities for detailed process disclosure, and the production personnel implemented the process with high quality. With the cooperation of all departments, the branch successfully trial produced a 14T steel ingot with a material of 42CrMo and a height diameter ratio of 6.0, and all performance indicators have reached the target requirements. Apply pressure to the surrounding samples with 10kN clamping force

the trial production of 42CrMo ingots with high aspect ratio is successful, and the branch company has made a major breakthrough in the production of ingots with high aspect ratio, marking that the production capacity and level of the branch company have reached a new level, and at the same time, the competitiveness of the branch company in the ingot Market has been improved, as shown in the following figure; It has laid a good foundation for opening up the steel ingot Market with high aspect ratio

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