The effects of microstructure of high-strength anti-seismic fire-resistant H beam for building structure on its strength, toughness and high temperature strength are studied with such analysis means as TEM (transmission electron microscope), metallographic microscope and EBSD (electron back-scattered diffraction). The results showed that the controlled rolling and controlled cooling were not needed under the premise of reasonable chemical composition design, two-phase structure of air cooling bainite and ferrite for test steel after hot rolling was obtained. It is found by observing the microstructure after holding at 600 ℃ for 3 hours that there is nano-level interphase precipitates in ferrite and their line spacing is about 24~34 nm. For the hot rolled high-strength anti-seismic fire-resistant H beam for building structure, its yield strength≥500 MPa, elongation≥22%, yield ratio≤0.85, impact energy at -20 ℃≥34 J and yield strength after holding at 600 ℃ for 3 hours≥310 MPa.

The characteristics and change rules of wear behavior for rail with different load conditions are analyzed through experimental study on wear of on line heat treated U20MnH rail combining with the morphology features of wear surface and profile for samples observed by microscope and scanning electron microscope. The results showed that the wear loss of on line heat treated U20MnH rail was significantly reduced with increase of load under load conditions of 1 200 N, 1 500 N and 1 800 N respectively.

In the paper, the general situations of production processes for 380HBW grade LH on line heat treated rail exported to Mexico are introduced. Its batch production is successful by microalloying component design, control of high cleanliness for smelting process as well as accurately regulating and controlling the on line heat treatment process of rail. All its performances could satisfy the technical requirements of users and requirements of AREMA standard as well as pass the SGS international testing and certification so that it could satisfy the operating requirements of freight train with great axle load on heavy haul railway abroad. It has been exported to such countries as Mexico, Australia and America.

In the paper, the fit tolerance and chamfer structure for quick-change coupler of oxygen lance as well as flexible connection mode between coupler and nozzle of medium are analyzed in detail. The fit dimension, chamfer length, surface roughness of fitting surface and type of connection of compensator are improved based on the analysis results combining with actual situations on site. On the premise of not affecting original using functions of oxygen lance, the rapid replacement for oxygen lance of 240 t converter is realized so that the duration of replacing oxygen lance is shortened, labor intensity of workers is reduced and safety of operating personnel is ensured.

In the paper, it is introduced the operation systems of cloud computing platform of Baotou Steel increase continuously with the development of enterprise informatization so that the time of operation and maintenance and routing inspection is long as well as efficiency is low. The regular operation and maintenance and routing inspection of server of operation systems are realized so that their efficiency is improved, hidden troubles are found out and eliminated timely as well as stability of system operation is improved by compiling the Shell script.

As the calibration item of Rockwell hardness tester, hardness of ball indenter for Rockwell hardness tester needs to be calibrated by Vickers hardness tester. Due to ball indenter is smaller, it cannot be fixed on smooth test bed so that calibration cannot be carried out. Moreover, it is needed to refer to correction coefficient table after calibration, the corresponding results can only be obtained through interpolation method so that work efficiency is reduced. In terms of hardware, the mold for fixing ball indenter of Rockwell hardness tester is made by precise machining and selecting suitable materials to ensure the stability of ball indenter. In terms of software, the linear regression is performed based on the data in correction coefficient table to obtain fitted equation of correction values. Moreover, the correction table for hardness of convex sphere is edited with the formulas in the WPS table so that operation process of data processing is simplified. As a result, the calibration of hardness for ball indenter could be carried out so that the work efficiency and test accuracy could be improved.

The accuracy of coal sample analysis depends not only on analysis technology itself, but also on accurate preparation of coal sample before analysis. The coal sample preparation is a complex process including a series of links such as crushing, mixing, division and preservation. The optimization of this process plays a decisive role in improving and ensuring the accuracy of analysis results. In current coal sample preparation process, such factors as segregation of particle size, sample contamination, drying time and improper preservation conditions could affect the representativeness of sample and accuracy of analysis results. In this paper, the preparation method and process optimization of coal sample are discussed. The quality and efficiency of coal sample preparation are improved by optimizing such processes as crushing, mixing, division and preservation, which could lay the foundation for improving the accuracy of analysis result for coal sanple.

In the paper, the detection method of magnesium content in silica-based composite material is studied and its purpose is to accurately detect magnesium content in the process of preparing silica-based composite materials so as to control the content of magnesium silicate in final product. During the experiment, the method for determining magnesium content in magnesium silicate-carbon-encapsulated silicon oxide composite material with the inductively coupled plasma atomic emission spectrometry (ICP-AES) is established. Finally, it is verified that the detection limit is 0.004 mg/L, relative standard deviation of detection results is less than 5% and linearly dependent coefficient is above 0.999 so that this method is satisfied with the test of magnesium content.

The identification resolution system for industrial Internet of Baotou Steel is connected to the national top-level node upward as well as radiates constituent companies in the whole industry chain and various application systems downward to form such typical application modes as enterprise management, manufacturing, product tracing, supply chain management and life cycle management so that the effects of reducing costs, improving quality and increasing efficiency are gradually emerged. Meanwhile, it will help enterprises get through data sharing channel, realize full control of different objects and full service of different products, effectively promote prosperity and development of identification system + integrated innovative application, further promote deep integration and high-quality development of industrial Internet and real economy as well as help enterprises accelerate digital transformation and upgrading through the application researches of identification resolution system for industrial Internet in the iron and steel industry.

A large amount of particulate matter, sulfur dioxide and nitrogen oxide are generated in production process of iron and steel enterprises. In order to reduce further damage of these pollutants to the atmospheric environment, it is necessary to carry out desulfurization and denitrification treatments for discharged flue gas. The conventional technologies of desulfurization and denitrification are with such drawbacks as large occupied area and smaller adaptative reaction temperature interval. In the paper, a new integrated technology of desulfurization and denitrification with fixed bed is emphatically introduced, which is with such characteristics as small occupied area as well as better adjustability of desulfurization and denitrification efficiency so that it is suitable for different production environments. After the technology is applied, the integration of dust removal, desulfurization and denitrification could be achieved as well as concentrations of pollutants could all reach the ultra-low emission standard.