The influencing mechanisms of banded structure, nonmetallic inclusions and grain size on transverse impact toughness are systematically analyzed aiming at such problems as great fluctuation of transverse impact property and unstable low-temperature toughness of H beam SM490YB for ocean engineering. The Mn segregation and spheroidized inclusions are effectively inhibited, grains are refined as well as microstructure homogenization is realized through adopting such comprehensive measures as composition optimization, modified inclusions with Ca treatment, low superheat continuous casting as well as controlled rolling and cooling. The transverse impact energy at -20 ℃ is improved, fluctuation is reduced, banded structure is improved, spheroidization effect of inclusions are obvious and grains are refined for H beam with specification of H300×300 with treatment of optimum technology.

The study on composition design of Nb microalloying and process optimization for HC300LAD+Z high strength low alloy steel is carried out based on the 1 880 mm hot-dip galvanizing production line of Baotou Steel in order to meet the market requirements of 300 MPa grade high strength galvanized sheet for light weight of home appliances. The effects of soaking temperature for hot-dip galvannealing process (790~850 ℃) on mechanical properties of product are systematically studied through the thermal simulation test and industrial trial production. The results showed that the increase of soaking temperature caused grain coarsening, yield strength was decreased from 335 MPa at 790 ℃ to 297 MPa at 850 ℃ and elongation was increased from 28% at 790 ℃ to 38% at 850 ℃. The target soaking temperature of annealing for industrial production is controlled at 810±15 ℃, microstructure is equally distributed ferrite+ a small quantity of pearlite without mixed crystal, yield strength is 310~368 MPa and elongation is 28%~39% for product, which could meet the thickness reduction requirement of 20% for components of home appliances so that the solution of reliable material for light weight of steel for home appliances is provided. The influencing mechanisms of annealing temperature on recrystallization behavior of Nb microalloyed steel are revealed in this study, which could provide the practical references for optimizing production process of high strength low alloy steel with similar production lines.

The industrial trial production of S420MLO hot-rolled high-strength low temperature resistant H beam for ocean engineering is carried out by Baotou Steel based on the industrial tests. The results showed that the yield strength of test steel was greater than 450 MPa and with certain surplus, its tensile strength was 615~628 MPa, average yield ratio was 0.75, elongation could reach over 26% as well as impact energy at -40 ℃ could meet standard requirement so that it is with excellent strength and toughness. The microstructure of test steel is mainly composed of ferrite and pearlite, the nano precipitated phase in matrix is with length of 100 nm and width of 20~30 nm, which could significantly improve the properties of steel. The S420MLO hot-rolled high-strength low temperature resistant H beam developed is with excellent comprehensive properties, which could provide the solid material support for safe service of such equipment as ocean platforms.

The epoxy resin is with the characteristics of high specific stiffness and specific strength so that it is widely used in such fields as the aerospace, automobile, construction and electronics. Its main disadvantage is brittleness so that the bending property of composite using it as the matrix is reduced. It is one approach for effectively solving this problem to use nano materials as the filler of epoxy resin. Therefore, the effects of hybrid filler composed of metallic nanoparticles and inorganic nanomaterials added into epoxy resin on bending property of epoxy resin matrix are mainly studied in this paper. The Fourier transform infrared spectroscopy (FTIR) test results showed that the hybrid filler composed of nano-Ti, nano-MoS₂ and carbon nanofibers (CNFs) was physically adhered with epoxy resin matrix so that the bending property of epoxy resin matrix was significantly improved. The hybrid filler is prepared with nano materials of four different weight percentages (2%, 4%, 6% and 8%). Among these, the enhancement effect of hybrid filler with 4% of nano materials on bending property of epoxy resin matrix is optimum. The morphology characterization of crimped section is carried out with scanning electron microscope (SEM). The synergetic enhancement effects of different metallic nanoparticles and inorganic nano materials on resin matrix are deeply analyzed in this paper, which is hopeful to provide guidance for improving the bending property of resin matrix composite.

The high carbon medium manganese steel is with the La+Ce complex processing. The occurrence state and change rules of storage for La and Ce in high carbon medium manganese steel as well as the effects of La and Ce on sulfides, oxide inclusions, microstructure, static compression hardening efficiency and impact wear property are systematically studied through the composition analysis, microstructure observation, 30% static compression, impact wear test and theoretical analysis. The study results showed that the contents of solid solution La and Ce in steel could not be increased by adding into a large amount of La and Ce as well as they all remained below 0.003 5% for high carbon medium manganese steel. The 30% static compression hardening efficiency at room temperature can be improved with La and Ce, from 94.4% without La and Ce to 96.68%~108.2% with La and Ce; impact wear resistance of sample is improved with La and Ce as well as relative wear resistance is increased by 1.057 0~1.606 9 times when impact load is 2 J and 1.080 4~1.374 1 times when impact load is 5 J. Under the experimental conditions, the optimal amount of La+Ce added into high carbon medium manganese steel is 0.20%~0.25%.

Under the background of national strategy of “east data, west computing”, Baotou Steel Group actively promotes the construction of data center relying on its energy and regional advantages. In this paper, it is introduced the technical architecture and construction practices of data center of Baotou Steel Group, analyzed its technical solutions from such aspects as green energy saving, integration of storage and computing and information technology application innovation cloud platform, summarized the application effects of data center in such fields as intelligent manufacturing and data governance as well as discussed the challenges facing and countermeasures for future development. The experiences of constructing data center of Baotou Steel Group could provide references for similar enterprises.

The robot has wide application scenarios in industrial field. In this article, the advantages and disadvantages and applicable scenes for inspection robots with different structures are discussed; structure and such key technologies as motion control of self-propelled orbit type inspection robot are mainly studied; frame structure, such modules of constituting inspection robot as main control system, control device of motion and walking, signal pickup assembly of vision and sensor, power management (charging device), wireless communication system and auxiliary functions and hardware design of corresponding modules are introduced; motion control method with proportion integration differentiation (PID) control technology of inspection robots and motion control optimization method of inspection robot with the technology of artificial neural network are studied; detection method of motion track for inspection robot based on radio frequency identification (RFID) technology is discussed; applications of inspection robot in industrial field are briefly introduced finally. The movement velocity and stability of inspection robot are improved so that its movement process is effectively optimized with the technologies and methods described in the paper, which could provide the technical support for applications of inspection robot in industrial field.

This paper is aimed to discuss the strategies for coal machine enterprises to manufacture middle trough of scraper conveyor with intelligent welding equipment. The applications of intelligent welding technologies in production of middle trough for scraper conveyor are comprehensively studied, which include the design of welded structure and process optimization as well as real-time monitoring integrated with multiple sensors. The comprehensive applications of multiple technologies could significantly improve the welding operation efficiency and welding quality of middle trough. It is expected that the content of this research could provide intelligent solutions as references for manufacturing enterprises of coal machine and mining production units.

As the key node of urban gas transmission and distribution system, safe and stable operations of gas station are highly dependent on continuous and high-quality electric energy supply. In this paper, the systematic research is carried out combining with the reliability theory and energy storage technologies of electrical power system aiming at the vulnerability of power supply system for key equipment in gas station (take the city gas gate station and LNG peak-shaving station as examples). Firstly, identify such key sensitive loads as compressor, electric drive pressure regulating device, safety instrumented system (SIS) and process control system (PCS) based on the architecture of power supply and distribution system as well as load characteristics in typical gas station; secondly, the influence probability and severity of consequences of such accidents as external power grid failures, internal electrical failures and voltage sag on key loads are with quantitative analysis by establishing vulnerability evaluation model of power supply system combining with the probabilistic risk assessment (PRA) and sequential Monte Carlo simulation; finally, the enhancement strategies taking energy storage system (including but not limited to UPS, flywheel energy storage, super capacitor and hybrid energy storage) as the core are proposed, optimum collocation model of energy storage capacity with the targets of power supply reliability, power quality improvement and full life cycle economy is established as well as emulation proof is carried out with the platforms of ETAP and MATLAB/Simulink.

The research object of this paper is the light carriage of electric wheel mining dump vehicle with load of 330 t. The three-dimension design of light carriage is carried out with Pro-E software, the simplified three-dimensional model is introduced into ANSYS for finite element analysis. The structural safety of carriage under the two typical working conditions of being fully loaded and stationary as well as driving on uneven road is analyzed based on the actual operations of electric wheel mining vehicle. The analysis results showed that the overall stress distribution of light carriage was more uniform, safety factor was larger, while deformation was relatively smaller as well as its strength and stiffness could meet the use requirements.