In the paper, it is affirmed the operation method of lowering charge level of blast furnace and sending gas is advanced as well as elaborated the formation mechanisms and preventive measures for detonation or blast of vapour in blast furnace to blow out smoothly so that the requirements of simple and convenient, fast, environment friendly and safe are achieved. As a result, over 75% gas in blowing out could be recycled, which is with certain economical benefits.

The correlation of refining slag and inclusions was investigated as well as the influences of chemical composition and w (CaO)/w (Al₂O₃) of refining slag on the size, morphology and category of inclusions in steel were analyzed aimed at the production technology of SPCC steel. The results showed that the distribution of inclusions in steel was better, proportion of large-grained inclusions was smaller and proportion of small-grained inclusions was greater when w (CaO)/w (Al₂O₃) of refining slag was 1.38~1.66.

The Bayan Obo West Mine is a large open pit iron mine. In the paper, it is introduced the measures taken and achievements of constructing green mine of Bayan Obo West Mine from such aspects as environmental protection of mine, comprehensive utilization of resources, energy conservation and emission reduction and construction of digital mine for mining, beneficiation, tailings discharging and ore pulp conveying of Bayan Obo West Mine by taking the construction as the example. Moreover, the existing shortcomings are discussed to provide the basis for the future construction and development of West Mine.

At present, due to such outstanding advantages as the large ratio of crushing and strong crush capacity, the new-type high-efficiency hydro-cone crusher has been widely used in crushing system of mines. Its degree of automation is high and system structure is more precise so that the requirements for operation and maintenance become more stringent. In view of the high failure rate of cone crusher seriously affecting the continuity and smoothness of production of ore dressing system as well as the equipment maintenance costs are increased, it is important to realize delicacy management of crusher and establish corresponding management measures for reducing equipment failure rate and improving crushing efficiency.

Shenmu coal is with low ash, sulfur and cost as well as it is rich in coal storage. The coal blending amount of Shenmu coal could reach 3%~5% by carrying out the coal blending for coking test with directly blending Shenmu coal and coal blending tests with different fineness, optimizing coal blending structure, reasonable coal blending as well as improving cohesiveness of briquette blend. The results showed that the ash and cost of coke could be reduced by blending Shenmu coal, which provided the technical support for Baotou Steel to expand the usable range of coal source as well as reducing costs and increasing benefits.

In the paper, the differences of phosphorus content in coking coal of each region were studied based on the phosphorus content in coking coal of Baotou Steel as well as the phosphorus contents in blended coal and coke under the same production condition were tested and analyzed to obtain the data transformation relation between them. Meanwhile, the mode of occurrence of phosphorus in coal was analyzed to study the correlation between phosphorus content, ash content and sulfur content. The results showed that there were significant regional differences for coking coal of Baotou Steel as well as there was a positive correlation between phosphorus contents in blended coal and coke, which provide important support for predicting the phosphorus content of coke and controlling the phosphorus load of coke of blast furnace.

After the 7^# and 8^# blast furnaces were put into operation one after the other, the water slag treatment system was put into use at the same time. Due to the serious corrosion and wear of water slag treatment equipment, there are more sudden failures in production run and the operating rate of blast furnace water slag is low. It is effectively improved through optimizing the corrosion and wear of equipment as well as continuously practising and reforming technologies to solve problems in productions.

In the paper, it is introduced the process flow and operation conditions for cooling system of 6^# blast furnace as well as the reasonability and accuracy for cooling regime of blast furnace are improved by strengthening the daily management for closed cooling system of soft water and careful maintenance combining with the actual situations for operations of cooling system of 6^# blast furnace. Moreover, the problems and improvement suggestions are put forward to prolong the service life of blast furnace.

The originally designed iron influx for main channel before 4 150 m³ blast furnace of Baotou Steel is about 0.16 million tons. In the use process, it is found that only the refractory in jet impingement zone is eroded so seriously that cannot be used anymore, while the refractory in other parts of main channel keeps basically intact. If the main channel is disassembled, the cost of pig iron will be greatly increased. The iron influx of main channel could be up to 0.22 million tons through partial spraying with improving the spraying material, particle size and binder so that the cost of molten iron is decreased effectively.

In this paper, it is introducrd the pre-remained 240 mm × 240 mm section for 6^# casting machine of Baotou Steel is commissioned as well as such technical parameters as the electromagnetic stirring of crystallizer of casting machine, final electromagnetic stirring, secondary cooling water, nozzle type and water pressure of nozzle are mainly regulated and controlled. During the commissioning period, the low, medium and high carbon steels such as Q195, Q235, 45^# and SWRH82B were produced as well as the scab and cracks were not found on the surface of casting blank. The ratio of grades of 0 and 1 could reach 94% by sulphur print and macroscopic examination, so the quality control of casting blank is good and can meet rolling demand of Steel Rolling Plant.

In the paper, it is elaborated the development method for each working procedure of phosphorated high－strength IF steel BT170P1, studied the effects of C and N atoms on drawability, analyzed the reinforcing mechanism of such elements as Si, Mn and P, explained the mechanism of action of hot rolling process such as the finish rolling temperature and coiling temperature, continuous annealing process of cold rolling on microstructure and mechanical property as well as analyzed the inclusions, annealed structure of recrystallization for cold rolling, forms and distribution of precipitated phase in the microstructure. As a result, the product performances could meet the technical requirements.

In this paper, it is studied the microstructure and properties of medium carbon alloy steel by setting different finish cooling temperatures with two-stage cooling of 2 250 mm hot rolling production line of Baotou Steel. The results showed that as the finish cooling temperature was decreased from 500 ℃ to 100 ℃, the metallographic structure of the test steel was gradually evolved from the structure of "ferrite + pearlite" to the structure of "ferrite + martensite", the yield strength and tensile strength were increased rapidly as well as the elongation was gradually decreased. When the finish cooling temperature reached 320 ℃, the test steel began martensite transformation. According to the market demand, when the finish cooling temperature is set to 320 ℃, the performances of test steel were qualified with customer's 45° cold bend test on the basis of ensuring mechanical properties.

The controlled rolling and controlled cooling process system of EH36 grade experimental steel was studied with the Φ750 mm × 550 mm hot rolling test crew of Technical Center of Baotou Steel as well as the microstructure and propertjes of experimental steel were obtained, which could provide the experimental evidences for developing various grades of low-cost high-strength steel.

In the paper, it is introduced the capacity, rate capability and cycling stability of AB₅ type hydrogen storing alloy are improved by improving the cooling system in the melting process of hydrogen storing alloy and providing a pipeline fluid acceleration control device to improve the flow rate of pipeline fluid.

Regarding to the cracking problem of hot-rolled wheel steel BT380CL used for spoke produced with the 2 250 mm hot rolling production line of Baotou Steel during the machining process of customer, the cause for the flow forming punching cracking of hot-rolled wheel steel used for spoke is that the segregation band of pearlite, stripe of sulfide as well as such inclusions as silicate and aluminate in the center of plate are inconsistent with the plasticity of matrix through testing mechanical property, observing metallographic structure, scanning electron microscope observation of inclusions and energy spectrum analysis on the samples of tensile sample of parent metal, metallographic specimen and hardness sample as well as the metallographic specimen of both cracked and uncracked parts of spoke.

The high-pressure water pump loads are usually used in such more important occasions as the circulating water systems of iron and steel enterprises as well as the selected high-pressure motors are generally more expensive, so no matter they are too large or small, it will cause unnecessary waste. Thus, the motor selection for such loads normally is introduced in this paper.

In the paper, it is introduced the principle analysis for the main parts of machine tool influencing the single values for finished products of Colinet coupling threading machine of Steel Tube Co. of Baotou Steel and the countermeasures are formulated one by one, with which not only the problem that unstable single values for finished products of Colinet coupling threading machine is solved, but also the reference theoretical basis of repairing machine tool is provided for maintenance personnel so that the quality of products is ensured as well as the costs are reduced and the efficiency is increased.

In the paper, it is introduced the reasonable control mode is chosen and corresponding preventive measures are taken due to the smudginess of engine oil for diesel locomotive affects the reliability of locomotive operation. In order to prevent the pollution to oil system caused by engine oil without filtering entering diesel engine, it is necessary to make a sleeve with ring edge and install it on front cover of filter with the mounting hole on ring edge as well as two O-ring recesses are processed on the excircle of upper base of filter element to form effective sealing between the O-ring and front cover of filter. As a result, the working reliability and performances of diesel engine are improved as well as the service life of components and diesel engine is prolonged.

In this article, the working principle, equipment structure, control methods and technical parameters of high pressure water descaling system in 2 250 mm hot rolling production line of Rare Earth Steel Plate Plant of Baotou Steel are introduced. In order to produce the hot-rolled coil with higher surface quality for the plant, the key equipment of the system should be used scientifically and reasonably.

The main power equipment of combined cycle power plant in metallurgical enterprises is the gas turbine, which can burn the blast furnace gas with low heating value. In this paper, the applications and development of gas-steam integral unit are considered to be necessary in metallurgical enterprises through introducing the applications, advantages and characteristics of combined cycle power plant, analyzing its development trend as well as the economic and social benefits of using the gas surplus in metallurgical enterprises.

The sewage transformation project is a water-saving transformation project for subsidiary of a northern iron and steel enterprise, which is a practical project that could improve efficiency and seek development for iron and steel enterprises as well as it is with the significant economic, social and environmental benefits of water saving. In the paper, the economic benefits of water saving are evaluated with benefit-cost analysis on the basis of calculating the amount of saving water and water discharge; the environmental benefits are evaluated combining the quantitative method and qualitative method; the social benefits are assessed with the qualitative analysis. Finally, the conventional methods suitable for iron and steel enterprises to evaluate water saving projects are summarized.

The pier terminal is a common configuration of airport terminal, the fusiform steel roof is used for the airside concourse of newly built Terminal 3 of Yinchuan Hedong International Airport, which is with attractive appearance so that the perfect combination of reasonable structural form and architectural image is realized. In this paper, it is mainly introduced the processing and manufacturing technologies of multi-branch fusiform beam on the roof of airside concourse of the project.

The stepping billet shifer for feeding and blanking of NK flaw detector is improved on the basis of various traditional billet shifers and its own characteristics are formed using their advantages for reference. In this paper, it is briefly introduced its structure, working process and advantages, sketched the schematic block diagram for its motion principle as well as verified and analyzed its main parts so that the rationality of using it is verified.

In the paper, it is analyzed the damages of compensator in warm-air pipe system and their causes since the 7^# and 8^# blast furnaces of Baotou Steel were put into operation as well as proposed the design scheme of incresing the large pull rod of warm-air branch pipe. The pull rod is with four sticks of solid round steel with Φ150 mm and installed to warm－air branch pipe with sectional type in order to prolong the service life of ripple compensator in warm-air pipe system.

The two methods for measuring magnetic properties of non-oriented electrical steel include the Epstein frame method and uniwafer method. In the paper, it is introduced their equipment, sampling method, specimen size, amount and detection method as well as mianly analyzed the testing data results measured with them. The results showed that the range value and standard deviation of iron loss and magnetic polarization intensity measured with the Epstein frame method were all smaller and more accurate than those measured with uniwafer method, however, the sample size is large and requirements of specimen size are strict with the Epstein frame method, while the sample size is small and deviation is within permissible range with the uniwafer method, so the uniwafer method could replace the Epstein frame method to measure the magnetic properties of non-oriented electrical steel.

In the paper, it is introduced the characteristics that mineral effect and matrix effect of samples might be eliminated by melting samples with borate so that the fused beads of sinter and pellet samples were prepared. The calibration curves were established with optimum working conditions of X-ray fluorescence spectrometer and series of standard samples. The cobalt is as the internal standard element of Fe to simultaneously determine such five components as TFe, CaO, SiO₂, MgO and P in sinter and pellet. The test results showed that the relative standard deviation (RSD, n = 11) of the five components was 0.50%~4.10% as well as the measured values were basically the same as certified values, which could effectively guide site productions.

In order to reduce the constraints of industrial control computer caused by the operating system and computer hardware, the hardware and operating system changes as well as system maintenance should be simplified, so the Rockwell's IDC industrial data center R2000 solution was adopted in the upgrade and transformation of computer system in medium repair of 1^# blast furnace in 2018. Two redundant physical servers were used to run multiple operating systems and application program at the same time with the virtualization technology to separate the operating system from hardware changes so that the hardware requirements were reduced and the reliability of system was improved.