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 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.

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.

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 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.

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.

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.

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.

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.