The development idea of green and low-carbon smelting technology is actively practiced in Baotou Steel by taking the principle of “high efficiency, low consumption and high quality”. In recent years, with the increase of proportion of self-produced ore, gas utilization rate of the whole plant is increased by 2.43 percentage points, fuel ratio is cumulatively reduced by 33.1 kg/t and utilization factor of blast furnace is increased by 0.132 t/(m³·d) through actively improving quality of raw materials and fuel, controlling contents of harmful elements as fired, high oxygen enrichment, high blast temperature and coal ratio, selecting suitable theoretical combustion temperature, optimizing charging system, refining basic management of stokehole and standardized operations of production equipment as well as strengthening collaborative guarantee of working procedures. As a result, all technical and economic indicators are with greater progress.

In order to meet the requirements of steel for engineering structures with high strength, high toughness and good welding performance for bridge, the trial production of Q345qE hot rolled H section steel is carried out by Baotou Steel. It is successfully completed through strictly performing the process parameter requirements of the whole process of smelting, refining, continuous casting and hot rolling. The chemical components of trial-produced steel could meet the requirements of GB/T 714—2015 Steel for Bridge Structures, its yield strength is 417~419 MPa, tensile strength is 533~538 MPa, elongation is 28.5%~33.0% and low-temperature impact energy (-40 ℃) is 178~201 J so that all indexes could meet the standard requirements. The comprehensive performances of steel are stable, which could provide the technical support for industrial productions and applications of bridge engineering of Q345qE hot rolled H section steel.

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 factors influencing vibration accuracy are found out aiming at the problem of deterioration of synchronism for vibration table of 2-stream crystallizer for CSP continuous casting machine. The target of recovering vibration accuracy is achieved by such measures as replacing the hinge joint bearing of link mechanism for vibration table, adjusting elevation of base for link mechanism of vibration table and coping standard station of installing crystallizer on vibration table.

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.

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 microstructure of rail could be changed as well as mechanical properties, wear resistance and fatigue resistance of rail are significantly improved with heat treatment process so that service life of rail is increased. The online heat treatment process of remaining heat quenching has become the important part in production process of rail due to its advantages such as high efficiency and energy conservation. In the paper, it is discussed the effects of such key control factors in heat treatment process of rail as the stability of chemical compositions, heating and soaking processes of billet, online cooling process, equipment accuracy and process assembly quality on microstructure and various properties of rail in detail. The quality stability of rail could be guaranteed through the fine control of influence factors, which could meet the demands of modern railway constructions.

The rectification of audit is the “second half” of audit supervision in state-owned enterprises, the “last kilometer” to realize achievement transformation of audit as well as key link of maintaining the safety of state-owned assets and promoting high quality development of state-owned enterprises. In the paper, the prominent problems of ideological understanding, implementing responsibilities, mechanism construction, supervision collaboration and audit team construction in rectification of audit are analyzed by taking the requirements of closed-loop management system of auditing administration as guidance, combining with the regulations of Rectification and Implementation Measures for Problems Identified in Audit issued by the Audit Office of Inner Mongolia Autonomous Region, basing on the characteristics of large asset scale, multi-level supervision, long business chains and great social responsibilities of state-owned enterprises as well as focusing on their actual situations. Moreover, the optimization strategies are proposed from such five dimensions as implementing responsibilities, perfecting regimes, enabling technologies, establishing collaborative mechanisms and audit team construction, which could provide references for state-owned enterprises to achieve the goal of “rectifying one problem, perfecting one regime and governing one field”.

In order to evaluate the welding fatigue performance of plate with high strength wind power steel Q420NE, the plate with the thickness of 20 mm is welded with submerged arc welding process, fatigue trend diagram (S-N curve) of welded joint is obtained through fatigue test and fatigue limit under set condition is calculated based on this. When repetitive loading is set to be 10⁷ times, the maximum measured fatigue stress of welded joint is approximately 300 MPa, corresponding stress amplitude is 150 MPa and survival rate is 50%; when survival rate is 97.7%, its maximum fatigue stress is approximately 284 MPa and corresponding stress amplitude is 142 MPa.

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.