In the article, the solution of unattended weighing system for automatically weighing materials transported by vehicles integrating the measurement and weighing, automation and computer technology is proposed. The system is with such functions as data acquisition, data sharing and remote transmission, voice command, vehicle localization, image capture and video monitoring so that the goal of unattended weighing and intelligent management of materials transported by vehicles is achieved. As a result, various problems such as high labor cost and labor intensity as well as falsification in traditional manual weighing mode are effectively solved.

The proportion of coking fly ash in mixed pulverized coal used in the production with rotary kiln of pellets could reach 15%, production with rotary kiln process is trouble-free and quality of pellets is stable by studying rotary kiln of pellets with coking fly ash. Moreover, the problem of environmental pollution caused by stockpiling of coking fly ash is solved, which provides a new way for effective treatment of coking fly ash. The fuel cost and production cost of pellets are effectively reduced by adding coking fly ash into mixed pulverized coal.

The old horse of 7^# blast furnace of Baotou Steel is deeper. In order to shorten the project duration and reduce workload of removing residual slag iron in furnace hearth after blowing out, the mode of dropping stockline and discharging residual liquid iron is adopted. It is one of the most important links in blowing out operation of blast furnace to discharge residual liquid iron and its effect directly affects the clearance time of furnace hearth. In the paper, the process of discharging residual liquid iron for 7^# blast furnace of Baotou Steel during blowing out is mainly introduced. The previous preparation work mainly includes such as activating furnace hearth, confirming position of residual liquid iron notch, calculating amount of residual liquid iron and making residual liquid iron runner. The cutting of shell of blast furnace and cooling stave, manufacture of mud sleeve for residual liquid iron notch as well as the whole process of discharging residual liquid iron after blowing out are introduced in detail. The process of discharging residual liquid iron of 7^# blast furnace is safe and ordered. After blowing out, it is found that there is basically no residual iron in the furnace hearth when cleaning it, which indicates that the effect of discharging residual liquid iron this time is good and experiences are gathered for discharging residual liquid iron in future heavy and medium repairs of blast furnace.

In this paper, the production practices on improving automatic casting ratio of ladle are introduced as well as various improvement measures are proposed through deeply analyzing the factors influencing automatic casting of ladle combining with production practices. The practices showed that the automatic casting ratio of ladle could be increased to over 99.5% so that the goal of reducing unplanned products produced by cast billets with burning oxygen is achieved through improving the quality of stuffing sand, optimizing sand filling device, formulating plan of replacing nozzle, strictly controlling time of steel filling according to steel grade, preventing back flow of steel slag and shortening standing time of liquid steel.

The continuous cooling transformation laws of X120M pipeline steel is studied with Gleeble 1 500 thermal simulated test machine as well as it is with controlled rolling and controlled cooling in laboratory. The results indicated that the microstructure of test steel was mainly lower bainite and martensite when cooling rate was at 20~50 ℃/s. When the finish cooling temperature of test steel is at 380 ℃, its yield strength is 900 MPa, tensile strength is 1 015 MPa, elongation is 18%, impact energy at -30 ℃ is 180 J and shearing area of drop weight tear test at -20 ℃ is 100%. The mechanical properties could meet the standard requirements.

The transformation structure and critical points of phase transformation for rare earth alloyed high carbon wear resistant steel as well as continuous cooling transformation (CCT) curve of undercooled austenite at different cooling rates are studied by metalloscope, field emission scanning electron microscopy and quenching dilatometer. The results showed that the critical points of phase transformation were Ac₁=742.6 ℃, Ac₃=816.5 ℃ and Ms=307.0 ℃. When cooling rate is less than 0.4 ℃/s, the microstructure is a small amount of ferrite+pearlite; when cooling rate is 0.4 ℃/s, the microstructure is single-phase pseudo eutectoid pearlite; when cooling rate is greater than 0.5 ℃/s, the microstructure is gradually transformed to martensite; when cooling rate is greater than 4 ℃/s, there is only the microstructure of martensite+retained austenite in the steel.

The characteristics of continuous cooling transformation of fire-resistant test steel are analyzed as well as its microstructure at different cooling rates within 1~100 ℃/s are observed through drawing the continuous cooling transformation(CCT) curve of 345 MPa grade fire-resistant test steel. The results showed that there were ferritic and perlitic transformations of test steel when cooling rate was 1 ℃/s; there were ferritic and bainite transformations of test steel when cooling rate was 8~20 ℃/s, pearlite completely disappeared, grain size was reduced and proportion of bainite structure was increased; microstructure transformation of test steel was mainly bainite transformation, proportion of ferritic transformation was very low and grain size was further reduced when cooling rate was 50~100 ℃/s; ferrite disappeared completely, all the microstructure was changed to bainite and was with obvious tendency of lath when cooling rate was increased to 100 ℃/s. The analysis of CCT curve and microstructure for fire-resistant test steel provides theoretical basis for formulating cooling processes in the production process of 345 MPa grade fire-resistant test steel.

The feedback of user is that the elongation of cold rolled sheet with cold rolled base material SPCC manufactured by 2 250 mm production line after cold rolling and annealing is low, part of flow forming is not easily to form in punch forming process and cracking rate is higher. The cause analysis showed that its high Mn content was one of the causes for slightly higher strength of steel strip so that elongation was low and steel strip was easy to crack; cooling modes of the two production lines were different, the cooling mode of preconcentration was adopted by 2 250 mm production line and the cooling mode of predispersion was adopted by CSP production line so that the strength of hot rolled steel strip manufactured by 2 250 mm production line was slightly higher, elongation was low and steel strip was easy to crack. The elongation of hot rolled steel strip manufactured with raw materials with thickness of 3.0~5.0 mm by 2 250 mm production line is lower than that of hot rolled steel strip manufactured by CSP production line so that the elongation of cold rolled steel strip after cold rolling and annealing is also slightly higher due to the “heredity” of rolling.

The drop weight tear test (DWTT) is used to test the toughness of materials, mainly for studying the low-temperature toughness of metal materials. In the paper, the microstructure and morphology of samples corresponding to different area proportions of brittle fracture are compared and analyzed with optical microscope aiming at the unqualified DWTT properties of products during trial production process of heavy gauge X80M hot rolled steel strip. The composition segregation in thickness direction of casting blank is tested. It is found that the severe segregation in thickness direction of steel strip is the main factor influencing the DWTT properties by analysis. The center segregation of casting blank and DWTT properties of product are improved effectively by adjusting the arc alignment precision of segment and optimizing the specific water amount of continuous casting machine so that the goal of stable production of hot rolled steel strip for heavy gauge X80M pipeline steel is realized.

In this paper, the continuous casting billet of low temperature Hi-B steel, metallographic structure and texture of plates after such processes as hot rolling, normalizing, cold rolling, decarburizing annealing and high temperature annealing are observed with metallographic microscope and X-ray diffractometer (XRD) as well as the evolution laws of microstructure and texture in the whole process are analyzed. The results showed that the macrostructure of continuous casting billet was mainly columnar crystal and proportion of equiaxed crystal zone was 7%~12%; microstructure of hot rolled plate was composed of alternant banded structure of ferrite and pearlite; microstructure of normalized pickled plate was composed of fine crystal zone and recrystal microstructure. The textures at 1/8 of thickness of hot rolled plate and normalized plate are mainly Goss texture and brass texture as well as strong Goss texture is formed with the secondary recrystallization after high temperature annealing.

The coupling is an important part of oil casing and oil tube as well as they are connected into tubing string by coupling with the mode of screw joint. In order to improve the anti-galling property of thread of coupling, the high temperature manganese phosphating is usually adopted for coupling so that it is corrosion resistant, the friction is reduced and lubrication performance is improved. In this paper, the effects of free acidity, total acidity and acid ratio on the quality of phosphating film and phosphating reaction time are studied by experiments. The phosphating process parameters are further optimized to control the phosphating film weight to be within certain range so that more compact and homogeneous phosphating film is obtained.

In China, the steel for steel structure is mainly plate and applications of hot rolled H beam (RH) in steel structure is growing slowly. The use level of RH accounts for only 15% of total amount of H beam, which is relatively lower and the rest is welded H beam (BH). In this article, the specifications, types, production processes, residual stresses, microstructure at R corner, advantages and disadvantages as well as future development trends of BH and RH are compared and analyzed. Moreover, several countermeasures for the application bottleneck of RH in construction steel structure are proposed.

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.