Latest ArticlesThe paper mainly introduces that the 80 t converter completes the transformation of quick-change bottom blowing system and realizes the nearby sub-control function for the gas supply pipeline; protect the gas supply line connection at the furnace bottom and the four air-permeable core bricks; according to the different production conditions, optimize the bottom blowing air supply intensity; achieves blowing airflow smooth and strength stable throughout the furnace service, and guarantees the bottom metallurgical effect during the furnace service.
In the paper, it is briefly introduced the process flow of converter gas dry purification and recovery system, combined with actual production data, analyzed the factors influencing the gas recovery from various aspects such as process control, equipment operation, and organizational management, proposing the practical and feasible method to improve the recovery calorific value of converter gas, and the recovery and utilization of converter gas produced in the steelmaking process, which will not only bring better economic benefits to enterprises, but also effectively ease environmental pressure.
In the paper, it is expounded the process flow of steelmaking refining furnace, and introduced the technical process parameters and characteristics of dry VD furnace and steam VD furnace in Baotou Steel, and the energy-consuming equipment of two vacuum degassing systems for steam VD furnace and dry VD furnace in Steel-melting Plant are monitored in real time. Through analysis and calculation of test technical data, economic and technical indicators such as per ton steel energy dissipation ratio, fractional energy saving and per ton steel cost ratio are obtained.
The article mainly introduces the various strip break accidents that occurred in 1 780 mm cold rolling mill of Baotou Steel in recent years. The reasons for the mill strip break accidents are found from the hot-rolled materials, laser welding machine, tension leveller, trimming shear, rolling plans and other aspects, based on that, effective measures have been made in optimizing hot rolling process, laser welding machine parameters, tension leveller elongation, rolling plan lap and cold rolling equipment maintenance inspection and so on, through which the unit strip break has decreased significantly, and the operation rate has increased significantly, achieving good economic benefits.
The paper analyzes the water quality and existing problems of circulating water system in a Steel-melting Plant. Through experiments, the influence of circulating water on corrosion and scaling of carbon steel is studied, and the feasibility of increasing the concentration multiple of circulating water system is analyzed. The optimized operation parameters of the circulating water system are put forward through experimental study, and the feasible measures for water-saving and emission reduction are put forward based on the actual situation on site in Steel-melting Plant.
Through the analysis of the decomposition reaction process, the factors affecting the crude phenol moisture are found. The high pH value of solution after decomposition, the unstable stirring speed of compressed air, the short standing time and the water leakage of the pipeline have great influence on the high moisture content of crude phenol. By adjusting the pH value of solution 5~7, slowly adjusting the wind speed, prolonging the standing time and reforming the pipeline, the moisture content of crude phenol is significantly reduced from more than 16% to less than 14%, good results having been achieved.
The hot rolled drilling pipe STM-R780 is normalized. Experiments are carried out with different normalizing temperatures and holding times. Technical parameters such as yield strength, tensile strength, elongation, and metallographic structure of steel pipe are measured by relevant experimental equipment. The proper normalizing heat treatment system for strength and toughness is found out by analyzing the data.
In the paper, the systematic study is carried out on the proportion of Baotou Steel self produced concentrate in pelletizing through optimizing ore proportioning method. The results show that with the addition of bentonite, in the condition of without increasing the other flux, the highest proportion of self produced concentrate in pelletizing can reach 35%; while in the condition of increasing magnesian flux, the proportion of self produced concentrate can reach 40%, and the finished pellets index can meet the requirements of the pellet index for 4 150 m3 blast furnace in Baotou Steel.
In the paper, it is introduced the research situation on standard residual stress of heat treatment rail in Baotou Steel, and analyzed the heat treatment rail of Baotou Steel by means of patch method, incision method and X-ray diffraction, and analyzed the residual stress date of on-line heat treatment rail in Baotou Steel by being compared with hot rolled rail. The patch method test results show that the residual stress of rail heads for heat treatment rail produced by Baotou Steel is larger than that of hot rolled rail; the incision method test results show that the overall residual tensile stress of rail is larger than that of hot rolled rail; the X-ray diffraction method shows that the residual stress distribution on rail surface is uneven.
Through the end of converter, LF refining, VD vacuum treatment and full protection continuous casting and heating system, rolling process, non-metallic inclusion, strict control of carbon segregation and other aspects, and the analysis of metallographic phase for finished bearing steel, crack defect, low power steelmaking composition, the bearing steel is successfully researched and developed, meeting the standard requirements of GB/T18254-2016 and entering the market.
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