With the advancement of information construction for iron and steel enterprises, the data volume generated in various production technology process links is increased significantly, especially the data for raw materials and logistics of iron and steel, which shows universality, relevance, diversity, dynamism and complexity. In order to explore data values fully, the data warehouse of raw materials is successfully established, visualization management and deep analysis for raw material data of steelmaking are realized as well as mining, processing and analysis of data for raw materials and logistics of iron and steel enterprises are completed successfully with the big data platform, combining the ETL(extract, transform, load) data extraction technology with converging and developing personalized data aiming at the data for raw materials and logistics of steelmaking for a steel mill.

The prominent problem existed in the production and sales for Kabuki Mine of Wuhai Mining Co. is high rate of fine ore of raw ore, while the sale price of fine ore in market is the lowest so that costs are difficult to be covered. Therefore, it is of great significances for reducing costs and increasing benefits in mines to improve on-site blasting technology so as to improve blasting quality. In order to find new method to improve the blasting effect, numerical simulation of blasting in the zone of total explosion is realized based on different blasting schemes so that the technical problem of past single-hole numerical simulation is solved as well as the effects under different blasting conditions are with comprehensive and deep analysis. Finally, the scientific and reasonable technical scheme is proposed by optimizing blasting schemes combining with such three aspects as design, analysis and numerical simulation so that blasting costs are saved. The experimental study on hole-by-hole blasting with uncoupled charge in radial direction is designed and proposed through studying the influencing factors of blasting process on generation of fine ore and combining with existing technical plan of blasting for the mine. The numerical simulation of blasting scheme in blast zone is carried out based on the GDEM blasting simulation software and particle size is analyzed for simulation effects. The study showed that the rates of fine ore and block were decreased by 9.45% and 3.07% respectively, qualified lumpiness was increased by 12.52 % and blasting effects were significantly improved with the optimization scheme.

In order to change the current situations that iron grade of flotation tailings is higher and loss of ferrous metal is great in the complex process of iron separation of ore grinding, weak magnetic separation-high intensity magnetic separation-flotation, the recycling process of ore grinding-magnetic separation is adopted for flotation tailings. The contrast test for recovery of magnetic separation with single variable is carried out with different ore grinding modes (ball mill and attrition mill) and flotation tailings of different granularities. With the increase of proportion of fine minerals, the yield of magnetic concentrate is decreased from 76.73% to 48.78%, grade is increased from 38.1% to 61.15% and recovery rate is decreased from 86.20% to 78.29% after grinding flotation tailings by attrition mill. The yield of magnetic iron concentrate is decreased from 78.05% to 56.63%, grade is increased from 38.10% to 55.78% and recovery rate is decreased from 92.80% to 82.92% after grinding flotation tailings by ball mill under the same magnetic separation conditions.

It can be obtained that the concentration and granularity of pulp into fine sieve are positively correlated through experiment. The finer the granularity, the lower the concentration of pulp. The screening efficiency of sieve mesh with aperture of 75 μm is higher than that of the other three types of sieve mesh and it could reach 42.55% after using for 180 days under the conditions that the maximum concentration of pulp is 51.57% and minimum is 35.19% as well as experimental conditions of granularity of pulp into fine sieve and service time. The increase of run load for ball mill caused by low screening efficiency of fine sieve, pressure of staff who need to frequently change sieve mesh and potential safety hazard on site caused by frequently changing sieve mesh could be effectively reduced by selecting optimal operating conditions of sieve mesh for fine sieve.

The effective volume of 7^# blast furnace of Baotou Steel is 4 150 m³. On October 23rd, 2022, it was blown down for gunning of lining and remolding inner profile. In the blowing down, the method of dropping stockline by spraying water was adopted and the stockline was dropped to a position below center line of tuyere. The methods of reducing the basicity of furnace slag ahead of time and increasing furnace temperature were taken to increase wall temperature, the match of air and oxygen quantities and assessment method of depth of stockline different from the past as well as the method of spraying water, that is, monitoring the mean value and difference value trend of four points of top temperature to control the water quantity were adopted. After taking the above measures, stockline could be dropped safely and rapidly.

In the production technology of continuous casting, oriented silicon steel, as a type of “soft steel” in the traditional sense, shows unique physical properties. Its thermal conductivity is relatively poorer, liquid thermal conductivity is approximately 27% lower than that of ordinary carbon steel so that it shows significant weak thermal conductivity. This property makes it easy to be deformed in high temperature environment. Consequently, there are often such surface defects as liquid level fluctuation of crystallizer, bulge and dimple of ingot blank as well as such internal quality issues as center segregation, center porosity and cracks during the continuous pouring production process. These issues directly impact the number of continuous pouring heats. In order to solve these problems, it becomes the key strategy for increasing the number of continuous pouring heats to design and implement reasonable cooling regime and casting speed.

The effects of adding rare earth element Ce on microstructure and magnetic properties of non-oriented silicon steel 50W470 are studied from such aspects as inclusions, precipitates, grain size and texture. The proportion of central equiaxed crystal in the billet of non-oriented silicon steel after adding rare earth element is 41%~45%, size of rare earth inclusions existed in forms of globularity and rod without sharp corner is about 664 nm. There is obvious inhomogeneity of microstructure on the RD-ND plane of hot rolled microstructure, it is mainly recrystal microstructure with a small amount of banded microstructure on surface layer and mainly banded microstructure in the center as well as there are part of recrystallized grains among banded microstructure. For the finished product of rare earth doped non-oriented silicon steel 50W470 produced with complete process, its magnetic properties, iron loss P1.5/50 is 3.142 W/kg and magnetic induction intensity B50 is 1.705 T.

The studies on hardenability and heat treatment test of steel tube for trenchless drill pipe are carried out combining with its service condition requirements and main failure modes in the paper. The experimental results showed that the depth of hardening layer for obtaining minimum 50% martensite was 11 mm and that for obtaining minimum 95% martensite was 7 mm for the seamless steel tube for trenchless drill pipe containing rare earth, which was with good hardenability; the optimal recommended heat treating regime was obtained after the heat treatment test with adjusting tempering temperature.

With the incremental production of small size products, coil shape control gradually becomes the key link to restrict quality and benefits. The defective coil shape not only affects operation rate and economic and technical indexes of high speed wire rod production, but also causes such problem as there are troubles in the process of using wire for downstream users so that the efficiency of downstream processing is affected. In this paper, it is analyzed some factors affecting the spinning state of wire rod in high speed wire rod production line, briefly elaborated several cases of defective coil shape in production process, analyzed causes of problems and proposed solutions so as to improve the production efficiency and quality of product. The regular coil shape could ensure smooth wire and reduce rate of fracture of wire for drawing of users so that the quality improvement in the whole process is realized.

In this paper, the causes of surface defects for 310 zed beam rolled by YQ450NQR1 continuous casting billet produced with cross section of bloom (320×415 mm) by 7^# continuous casting machine in Steel-making Plant of Baotou Steel are analyzed and control scheme is proposed so that the yield of product is improved. The tongue-shaped defects in rolled products are determined to be caused by the surface crack at corner of continuous casting billet by analyzing the macrostructure and microstructure of continuous casting billet and rolled products with metallographic microscope and scanning electron microscope. The qualified rate of YQ450NQR1 continuous casting billet is improved from 90.5% to 98.5% and stable control of product quality for 310 zed beam is realized through reducing the water amount and optimizing uniformity of water crevice for crystallizer to improve the uniformity of continuous casting billet cooled in crystallizer as well as taking such measures as reducing the specific water amount of secondary cooling, increasing casting speed to increase the surface temperature of entering tension leveler and optimizing slow cooling regime.

In the paper, the typical rollover defect at edge on surface of stainless steel plate is studied. The morphology, microstructure and composition of cross section for rollover at edge are analyzed by metallographic microscope and scanning electron microscope. It is found that the rollover defect at edge has formed on hot rolled intermediate billet as well as micro morphology is the crack with opening pointing to edge and there is delamination for subscale, which is caused by uneven transverse deformation of metal in rolling process under high temperature condition. According to this, a type of formation mechanism of the defect is proposed. This defect could be reduced or even eliminated through effective prevention measures so that the impacts of it on yield of finished products could be reduced.

The 590CL wheel steel is formed by spinning and stamping technologies to be made into automobile spoke. There is cracking in the process of stamping air hole. The cracking position is determined to be between the air hole on outer edge of spoke and shear end as well as fracture origin is at the air hole end of wheel steel, which is about the central part of plate thickness through macroscopic observation of cracked wheel steel as well as such comprehensive analysis as scanning electron microscope and metallographic examination; the zone of segregation in the core of wheel steel with inclusions those are mainly C and Nb in shape of dot string could all hinder normal deformation of ferrite in pre-forming process so that the fluidity of metal is inconsistent. As a result, the work hardening is generated and stress concentration in segregation in the core induces cracks, then stress is released through punching so that cracking is caused. It is suggested to adjust the composition to ensure appropriate proportions of niobium and carbon as well as optimize processes of steelmaking, continuous casting and rolling in the future production and processing processes.

The assembly for pretwisted blades of turbine has significant effect on its overall performance. In this paper, its deformation mechanism is studied and simulation experiments are carried out through finite element model to verify the accuracy of assembly system for pretwisted blades. The process parameters of manually tapping blades are obtained using high speed camera and piezoelectric type impact sensor as well as corresponding mathematical model is established. The parameters of this model are adjusted in software to design the assembly system for pretwisted blades of turbine. The final results indicated that sufficient impact could be generated by the assembly system to meet assembly requirements when the range of air source pressure was between 0.4 MPa and 0.6 MPa so that feasibility and effectiveness of the system were verified.

With the rapid development of artificial intelligence, automatic driving technology and intelligence of mining, unmanned intelligent vehicles in mines have gradually become the important tool for improving operation efficiency in mines, reducing accident incidence and saving costs. In this paper, the key technologies, functions and challenges faced of unmanned intelligent vehicles in mines are systematically analyzed. First, the application background of driverless technology in mine environment is discussed as well as such key technologies as perception, decision making, control and communication it needs in mining operations are analyzed. Second, the core functions of unmanned intelligent vehicles in mines including auto drive and path planning, collaborative operations, safety and exception handling are proposed. Finally, the technical challenges faced by unmanned intelligent vehicles under the working conditions of complex geographical environment, severe weather and high load are analyzed as well as the solutions are proposed and development trend of unmanned intelligent vehicles in the future is prospected. This paper is aimed to provide the theoretical supports and technical references for research and applications of unmanned intelligent vehicles in mines.

In this paper, the measurement methods of gauge, diagonal and horizontal bending of main beam for metallurgy crane are mainly studied. Traditional measurement methods for crane with such tools as steel wire and ruler are with such disadvantages as low efficiency, poor accuracy, strict conditions and high safety risk. In order to finish the measurement work of metallurgy crane accurately and efficiently, several methods for measuring gauge, horizontal bending and diagonal of metallurgy crane using instruments and tools are studied as well as the traditional measurement methods of crane are improved and innovated. Practices show that the efficiency of measuring metallurgy crane is greatly improved with these measures.

The heating in smelting and rolling laboratory is with natural gas radiation as well as the CO generated by natural gas leakage and incomplete combustion can lead to such accidents as fires and explosions very easily. In the article, a wireless and low-cost detection system of flammable gas is developed, which is with the STM32F103 series single chip computer as main control system. The concentrations of methane and CO in workshop are monitored with MQ-2 and MQ-7 gas sensors, temperature and humidity in workshop are monitored with SHT30 sensor of temperature and humidity as well as the data collected by sensors is transmitted to mobile terminal with Bluetooth module. The data processing and analysis are realized with mobile terminal and Android operating system, which could meet the requirements of monitoring flammable gas used in smelting and rolling laboratory.

With the scaling up of air separation equipment, the capacities of supporting motors for air compressor, supercharger and oxygen reciprocating compressor are also increased. The capacity of motor for air compressor is developed to over 20,000 kW and scaling up of motor has brought unprecedented challenges for control and starting of motor and power grid. The start-up process of high-capacity motor is particularly complicated. On the one hand, the influences on power grid should be considered, on the other hand, the impact on motor and starting equipment should also be considered. Various starting modes are adopted based on conditions and demands in the industry, the reduction voltage with auto transformer discussed in the paper is one of mature reduced voltage starting technologies. The impact of auto transformer on power grid is low as well as it is with simple operation and stable performances, so it is widely used in the air separation industry. If the control mode of reduced voltage starting for auto transformer is selected improperly, it will cause certain damages to motor. The start control of auto transformer is studied and analyzed through cases in the paper.

Dust removing fan is the key equipment of blast furnace production system. If there is abnormal vibration of fan equipment, the fault alarm would be triggered. As a result, there is not dedusting air volume in the environmental dedusting system so as to cause such environmental pollutions as flying dust. In the paper, it is proposed the causes and solutions for vibration fault of motor for dust removing fan for blast furnace by taking the basic principle of “high efficiency, high quality, low cost, green and environmental” as well as elaborated strengthening method for foundation bolt of motor and how to solve the problem of motor vibration with the six-point positioning principle. This method has been validated through field practices, which could effectively prevent and solve the problem of unnatural vibrations for dust removing fan.

In the wave of digital transformation, the intelligent operation and maintenance technology has gradually become important method for enterprises to improve operating efficiency and reduce costs. Grafana, as the visual monitoring tool of open source data, is widely used in intelligent operation and maintenance with its powerful data integration ability and flexible visual interface. In this paper, it is discussed the applications of Grafana in operation and maintenance of iron and steel enterprises as well as analyzed its core functions, best practices and practical cases, which are aimed to provide references and guidance for enterprises to implement intelligent operation and maintenance.

With the development of global economy, the energy poor and environmental pollutions are becoming increasingly serious as well as low carbon and environmental protection, energy conservation and emission reduction have become the focus of global attention. In this context, Baotou Iron & Steel (Group) Co., Ltd. actively responds to the call of the country, promotes elimination and replacement of old-fashioned diesel locomotives, which are committed to achieving green and low-carbon railway transportation. In this article, the transformation ideas, technical solutions and practical application effects are discussed by taking the research and development and application of pure electric locomotives in factory region of Baotou Steel as object of study. The practical application shows that the effects of pure electric locomotives on saving energy as well as reducing consumptions, carbon emissions and noises are significant. The research of this article provides the solutions for green railway transportation of all industries as well as practical references for promoting green transformation of rail transit equipment in our country and high quality co-construction of the “Belt and Road”.

Enterprise archives are important components of scientific research achievements of enterprises as well as with such important functions as ensuring the traceability and confidentiality of scientific achievements and knowledge accumulation. With the continuous development and progress of enterprises, the management mode of enterprise archives also needs to be constantly innovated and transformed to meet the needs of technological innovation and development in the new era. In this article, it is aimed to discuss the direction and path of innovation transformation for management mode of enterprise archives in scientific research institutes, which could provide beneficial references for innovation and improvement of management mode of enterprise archives.