The industry is the pillar industry of national economy. In the process of industrial production, its virtual simulation is carried out with the computer simulation technology, the running conditions of production line could be simulated by the simulation technology so that the rhythm of production and technological process are optimized as well as production efficiency and capacity are improved; the layout of production line, process arrangement and equipment configuration are optimized to improve production efficiency, reduce production costs and waste of resources. In the paper, the solutions for intelligent production line of rare earth oxides are designed with the computer virtual simulation technology by taking the intelligent manufacturing project for production line of rare earth products as example. It plays role in optimizing the technological process of intelligent manufacturing and layout of production line of rare earth oxides products. Moreover, the real scenarios of industrial production and virtual reality simulation are deeply integrated with the simulation technology so that customers could truly feel and understand the intelligent manufacturing process of production line of rare earth oxides.

In order to expand the coal resources for coal injection of Baotou Steel and reduce the fuel cost of blast furnace injection, the laboratory study on applying hydrogenated semi-coke with destructive distillation in blast furnace injection is carried out by Baotou Steel. The results showed that the hydrogenated semi-coke with destructive distillation was high quality fuel of blast furnace injection with such characteristics as low moisture, volatiles and sulfur content as well as high fixed carbon, however, its bulk density was much smaller than that of mixed pulverized coal as well as its combustion rate was better than that of existing mixed pulverized coal and without explosiveness so that its combustion and safety performances could meet the safety requirements of blast furnace injection.

During the operation of generator set in a plant, there is the problem that the current of exciting carbon brush for generator is unbalanced as well as the current and temperature of carbon brush are high. The factors for unbalance of current for carbon brush are such as the low quality of carbon brush itself, mixed application of multiple-model carbon brushes and increase of contact resistance during operation of carbon brush through analysis. As a result, such improvement measures as replacing high-quality carbon brush with the same model and batch, adjusting spring pressure of brush holder for carbon brush as well as strictly implementing assembly process of carbon brush. Moreover, the corresponding preventive measures are put forward. After the improvement, the problem of unbalance of current for exciting carbon brush of generator is obviously improved.

In the paper, it is studied the effects of alloy elements on microstructure, mechanical properties and resistance to scute burst of high strength enamel steel for inside liner of water heater as well as analyzed the mechanism of action of hot rolling process such as finish rolling temperature, coiling temperature and continuous annealing process of cold rolling on microstructure and mechanical properties. The trial production results showed that the yield strength was 245~272 MPa, tensile strength was 362~386 MPa and elongation was 39.0%~41.0% for the cold rolled high strength enamel steel, which could meet the production requirements of inside liner of water heater. Its microstructure is mainly composed of ferrite and pearlite as well as a little MnS and TiN particles were with dispersed distribution. It is further verified that the developed high strength enamel steel is with good resistance to scute burst through the sensitivity test of anti scute burst and test of end user.

In this article, the current status of processes and equipment for smelting and rolling heavy rail steel in domestic manufacturing enterprises of heavy rail is mainly introduced. The advantages and disadvantages of different steel-making processes are analyzed through comparing the technical indicators achieved by different control modes of different smelting processes, pretreatment of hot metal, smelting with oxygen top-blown converter, refining with ladle furnace (LF), vacuum degassing and continuous bloom casting; the effects of different processes on product quality and the product range that can be rolled are analyzed through comparing the process characteristics of different layout forms of rolling modes such as continuous rolling modes of universal three stands, universal three stands 2+1, universal five stands 2+2+1 and universal four stands 3+1 so that the advantages and disadvantages of different rolling processes are elaborated. In addition, the straightening machine and detection equipment of heavy rail are briefly introduced.

The hot-rolled coil with X52MS pipeline steel for acid service by industrial production is chosen as the research object as well as its material performances are analyzed from microstructure and chemical components. Its resistance to hydrogen induced cracking (HIC) behavior in H₂S solution is mainly studied, the effects of microstructure and microregion components on the resistance to HIC are investigated by HIC test as well as the main causes for crack generation are analyzed so that its regularities are found out. It is summarized that banded structure is the main cause for failure of resistance to HIC for this material, carbon segregation and central aggregation of inclusion of carbohydrates and nitrogenous compounds would worsen the effects of banded structure on the HIC performance; the thought of low carbon component design is the premise of designing pipeline steel for acid service as well as reasonable control of nitrogen content is also one of the considerations in production of pipeline steel for acid service.

In this paper, the optimization plan of chemical composition, hot rolling and annealing processes is formulated through analyzing the influences of stress concentration, inclusions, chemical composition, mechanical properties and metallographic structure on fatigue strength with the metallographic microscope and field emission scanning electron microscope. The results showed that the tensile strength of material could be improved by 11~45 MPa by increasing the contents of carbon and manganese in chemical composition, reducing the content of harmful element sulfur as well as matching hot rolling and annealing processes so that the pearlite in metallographic structure was granular and with dispersed distribution. After made into the guide rail, its push-pull effort, service life and functions are tested as well as it is determined to be qualified according to the standard requirements.

In the paper, the production practices on increasing production and reducing fuel ratio for 7^# blast furnace of Baotou Steel are summarized. In September 2022, the average daily output reached 9 370.7 t/d, utilization coefficient of effective volume for blast furnace was 2.258 t/m³·d and fuel ratio was reduced to 548 kg/t through taking a series of effective measures such as strengthening the management of crude fuel, increasing wind-warm syndrome, furnace top pressure, oxygen enrichment rate, batch weight of ore and coke ratio of ore into furnace as well as optimizing the charging system, reducing the amount of central coke and improving gas utilization rate.

The stability of moisture of mixture is directly related to the granulation effect of sintering and heat transfer rate in sintering process so that the quality index of sinter is affected. It is found out that the main factors influencing stability of moisture of mixture include the moisture of iron charge, blending process as well as addition of fly ash and cold return fine through the comprehensive analysis on moisture of each crude fuel for 500 m² sintering machine of Baotou Steel and factors influencing moisture of mixture. The stability of moisture of mixture is obviously improved and black pipes at sintering machine tail are reduced through producing process monitor and control of moisture of each iron charge, adjusting and optimizing production technologies as well as formulating corresponding measures such as production and operation methods and technical improvement of equipment so that such indexes as the qualified rate of alkalinity for finished sinter, stability of FeO, qualified rates of drum strength and average particle size are with year-on-year increase.

The independent research and development has been carried out by Baotou Steel according to the technical requirements of steel for protective base plate of special vehicle for users. Its reasonable chemical compositions, rolling and quenching and tempering processes are designed as well as the microstructure is determined and mechanical properties are analyzed. The results showed that its mechanical properties were excellent, yield strength was 730~770 MPa, tensile strength was 826~860 MPa, elongation after fracture was 18.0%~20.0% and low temperature impact absorbing energy at -40 ℃ was 203~256 J, which could meet the technical requirements of users.