Battery shell steel is used for the production of steel battery shell. It is the precision cold-rolled product with high technology content and high requirements for quality, and has high speed, deep drawing, thinning drawing process and strict appearance quality requirements. In the paper, based on the characteristics of existing technical equipment, the scheme is established from composition design, structure property, manufacturing technique and other aspects, and the stability, thickness deviation and surface roughness for thin gauge rolling are dealed with. The actual product quality of trial products meets the customer's requirements completely, enriching the company's steel products range.

In the paper, based on the engineering geological conditions and mining scheme of E zone, the three-dimensional geological model is established for slope of E zone. Using FLAC3D finite difference software, numerical simulation is done for the whole process of excavation from the original surface to the 1 230 m platform of pit bottom. It is analyzed from three aspects of stress field, displacement field and plastic zone, so as to predict the stability and stability development situation for slope of E zone during the process of continuous excavation to the pit bottom, which provides a more reasonable basis of the precaution and the design of treatment scheme for the lower excavation slope.

According to the numerical simulation analysis, the potential failure area and failure mode of slope at the present stage are judged. Combined with the development trend of stability deformation in the subsequent excavation, the governance area and governance scheme for the slope at the present stage are determined, and through the numerical simulation method, the governance scheme is designed and verified.

Based on the theory of mechanical design, after theoretical calculation, combined with actual situation of the site, through a series of optimization and modification for car dumper system, the failure rate of car dumper system is reduced and the turnover efficiency is improved. The practice shows that the transformed car dumper system can be more stable and efficient.

In the paper, it is mainly discussed the improvement of mixture water feeding and wetting method, which helps to improve the pelletizing speed and pelletizing efficiency of mixture, improve the breathability of material layer, and significantly improve the quality of sinter mineral.

In the paper, it is introduced the process of gradual development of distributor with independent intellectual property by Baotou Steel and its application in large blast furnace in recent years, and aiming at the failure of the distributor in large blast furnace under the special furnace condition of Baotou Steel, the measures for improving the center throat pipe and bracket of distributor are improved, which improves the application capacity of distributor in Baotou Steel.

The fracture of throat protection plate and the furnace top sealing cover spray coating off in No.7 blast furnace of Baotou Steel are usually required for repair in a 10-day period. In order to save time meanwhile without furnace cooling down, a series of special measures such as burden distribution, forced ventilation, positive pressure respirator are taken to work into the furnace under harsh environment with high temperature and gas, which saves time, creats high efficiency and creats a new thought for the blast furnace maintenance.

The effect of different parameters of final electromagnetic stirring (F-EMS) on equiaxial crystal ratio and carbon segregation index in the center of Φ270 mm section slab is tested and analyzed. The result shows that during the continuous casting of medium carbon steel, the final electromagnetic stirring parameter is 300 A/10 Hz, so that the center equiaxial crystal ratio of the billet is more than 35%, and the central carbon segregation index of the billet is less than 1.05.

In the paper, it is introduced the production process general situation of using 320 mm × 415 mm section to produce 75 kg/m heavy rail in Baotou Steel, and the changes in carbon segregation, grain size and inclusion control of rails produced by 280 mm × 380 mm section are also compared and analyzed.

Heat treatment of U76CrRE rail is simulated by using MMS-200 thermal simulated test machine. The influence of pearlite transformation temperature on its microstructure and hardness is obtained by microstructure observation and hardness testing analysis. And the results show that the lower transformation temperature, the shorter interlamellar spacing in pearlitic microstructure of U76CrRE rail is and the hardness is increasing. At 560 ℃, there is a small amount of martensitic structure in microstructure.

In the paper, it is mainly discussed the low carbon microalloying is used to produce anti-seismic Q235KZ hot rolling H beam, through the reasonable chemical composition design and production process control and other means, the anti-seismic H beam with high strength yield ratio, good toughness and weldability is produced, which changes the comprehensive performance of Q235B hot rolling H beam.

By comparing and analyzing the strength and toughness of X65M product produced through three component system and two hot rolling processes, it is concluded that using low carbon Mn-Nb-Ti component system design to produce hot rolled steel strip with thinner gauge (t≤12.65mm) is more economical and reasonable. At the same time, the TMCP measures combined with large rolling pressure, rapid cooling and low coiling temperature are more beneficial to improve the strength and toughness of material.

In the production of 15Mn seamless steel tube with hot rolling process, the pipe body has obvious banded structure. Through the chemical composition and metallographic examination of pipe body and the analysis of solidification process and rolling process for continuous casting billet, it is concluded that the dendritic segregation in continuous casting billet is the main reason for pipe body to produce banded structure, and the corresponding improvement measures are put forward.

The edge cracks on SPHC coil produced in 2 250mm hot rolling line of Baotou Steel is analyzed. It is concluded that the lower w [Mn]/w [S]of coil can cause micro cracks in the edge and corner of slab, forming defects along with the metal flow to the edge of the strip during rolling process. In practice, when w [Mn]/w [S]≥12, SPHC edge crack can be effectively avoided.

Morphology and composition of red scale defects on hot rolled DP600 surface produced in 2 250 mm hot rolling production line are tested and analyzed. High contents of Si makes it difficult to remove FeO and residual FeO is pressed into matrix, which is the main reason for red scale defects. The industrial test results show that adding phosphorus microelement, reducing heating time of billet and shortly staying at temperature before phosphorus removal machine can significantly reduce red scale and improve surface quality.

The cold drawing of ER70S-6 welding wire steel is from Φ5.5 mm to Φ1.2 mm, and the brittle fracture occurs when drawing to Φ1.3 mm, and all fractures are pencil-tip shaped. Through the test and analysis of metallographic, chemical composition, mechanical properties and scanning electron microscope, the main cause of brittle fracture is the hard massive martensite produced by the composition segregation and the excessive cooling rate during the rolling process. In the process of drawing, hard massive martensitic structure does not change with the deformation of the matrix and produces a large number of cracks around it, and brittle fracture occurs when the deformation is large.

In the paper, it is analyzed the influence of hot rolling mill stiffness on the rolling stability and is introduced the method of evaluating the hot rolling mill stiffness; finally, through the PDA data of CSP mill in Baotou Steel, the mill stiffness analysis is carried out by the data method.

In the paper, the problems occurred in the operation of flying shear control system in 2 250 mm hot rolling production line of Rare Earth Steel Plate Plant are analyzed in detail. Through tracking the actual production situation in the field, various factors that affect the shearing accuracy of flying shear are summarized, and the solution and improvement plan is put forward, so as to improve the hit rate and shearing accuracy of flying shear and optimize the cut loss index.

Aiming at the non-stationary characteristics of early failure vibration signal of gear and the fact that it is seriously affected by environmental noise and the fault feature is weak so it is hard to be extracted, the ensemble local mean decomposition is used to decompose the fault vibration signal of gear to obtain the product function of finite single component, so as to highlight the local characteristics of the signal. However, because of the noise interference, it is difficult to extract the fault feature frequency information from frequency spectrum of each component, and based on that, in the paper, the fault diagnosis method of ensemble local mean decomposition and minimum entropy deconvolution is proposed. Through the analysis of gear fault simulation experiment and project case, fault characteristic information of gear can be extracted accurately and effectively, which provides a new method for practical engineering application.

In the paper, thermodynamic calculation of yttrium zinc alloy prepared by electrolytic oxide in fluoride molten salt system is carried out. The decomposition voltage of Y₂O₃ + 3C = 2Y + 3CO is 1.4 V at 1 027 ℃; through the phase diagram analysis of LiF-YF₃ and Y-Zn two element system, it is known that electrolyte of (25%~100%) LiF-(75%~0%) YF₃(mass fraction) is molten state at 1 027 ℃, yttrium zinc alloy with the 20%~30% (mass fraction) zinc content is molten state; The analysis of alloy density shows that the density of yttrium zinc alloy>4.469 g/cm³, which is larger than the density of electrolyte.

At present, the separation of rare earth elements by solvent extraction method in P₅₀₇ hydrochloric acid system, in order to stabilize the quality of two export product in the extraction production line, and make up for the defects caused by the lag of analysis results. On the basis of production practice, the paper makes an effective improvement on the control process, and analyzes and discusses the process of technology improvement, improvement measures and effects.

The electric control system of bridge crane adopts dedicated G7 frequency converter to control, so it can realize stepless speed regulation easily. The speed control range is wide; the speed regulation precision is higher; the speed response time is quick; the torque at starting and low speed running is big and has S parameter setting for special hoist, so that hoisting motor can provide larger rated torque output at zero speed, prevent hoisting mechanism from generating hook gliding phenomenon and improve the safety in the use of crane.

Modbus protocol is a common language used in the electronic controller. Through this protocol, the controller can communicate with each other through the network and other devices. The paper describes the network communication between S7-300 PLC and third party device through the CP341 module, gives the specific communication protocol, technical solutions for the problem, and some examples of the implementation code.

In the paper, it is introduced the practical significance of furnace pressure control for continuous heating furnace in production control of heating furnace, and the detection method and control method of furnace pressure for heating furnace. Because the furnace door often switches, it will cause frequent furnace pressure fluctuation, however, the normal PID regulating mode has weak anti-jamming capability, and it is easy to occur oscillation when the measurement value changes frequently, so it can not be effectively controlled. Fuzzy control has the characteristics of fast convergence, small overshoot and strong anti-jamming capability, and is most suitable for controlling the furnace pressure.

The paper uses chekland methodology, based on study of mine geological work management contents, constructs the conceptual model of mine management; based on the comparison between conceptual model and actual situation, the paper analyzes and summarizes the main problems existing in the mine and draws the methods and measures that can effectively strengthen the mine geological management.

In the paper, it is introduced the planning and implementation of mobile informatization construction for iron and steel enterprise. Based on the mobile informatization project development and function of WeChat enterprise number, mobile informatization application which based on WeChat enterprise number for large iron and steel enterprise is constructed and it provides convenient mobile information searching and business processing for employees of Baotou Steel (Group) Corporation. So far, it has more than thirty thousand registered users following the WeChat enterprise number.

The quality of librarians determines the development level of a library. Based on the status analysis of the quality of librarians in higher vocational colleges in our country, in the paper, it is discussed the connotation and necessity of continuing education for librarians, and puts forward some methods and ways on how to improve the quality of librarians, how to serve the readers and teach better.