The real-time online monitoring device for faults of components for main driving axle is designed by taking the variable quantities of central position of main driving axle body of rolling mill as the characteristic quantities for faults of components for main driving axle, tactfully combining with the component structure of existing device based on analyzing the characteristics for faults of components for main driving axle of heavy plate mill. The practical applications verify that it is effective for real-time online monitoring of faults of components for main driving axle of heavy plate mill and equipment protection so that it is with more values of industry promotion and applications.

The operating efficiency of pump station for circulating water system (the core link of cooling for rolling production line and equipment protection) directly affects rolling quality and energy consumption. In the paper, it is systematically elaborated the full process practices of establishing intelligent pump station through such technologies as integrated variable frequency speed control, closed-loop regulation of dynamic pressure, intelligent voice warning and long-distance monitoring by taking the transformation project of unmanned pump station in Long Products Plant of Baotou Steel as the object of study. The long-distance centralized control for status of pumping set and intelligent management of water balance are realized through innovatively replacing traditional power frequency drive pattern of asynchronous machine with frequency conversion control of rare earth permanent magnet synchronous motor combining with adaptive pressure regulation algorithm based on the rolling requirements in project. As a result, the electricity cost is saved by CNY 1.025 3 million Yuan annually, fluctuation range of pipe network pressure is reduced to ±0.08 MPa and investment recovery period is about 2.18 years.

In this paper, the desulfurization effects of wet desulfurization process of ore sintering flue gas with different operating conditions, mixing ratios and operating parameters simulated by establishing simulation model with the ANSYS and MATLAB are studied with the composite desulfurization agent prepared by mixing desulfurization ash and limestone. The results showed that the desulfurization effect could reach 99.3% and concentration of SO₂ at outlet was not more than 35 mg/m³ with the operating conditions that concentration of SO₂ at inlet was 5 000~6 000 mg/m³ and optimal mass mixing ratio of desulfurization ash to limestone was 15%.

In this paper, the application of medium and low temperature denitration technology after wet desulfurization of ore sintering flue gas is studied with the pilot test by taking the flue gas after wet desulfurization in an iron and steel plant as the object of study. The 20-hole modified vanadium-based honeycomb-type catalyst is selected, average value of NOx at outlet at 230~240 ℃ is 35 mg/m³, which could meet the requirements of ultra low emissions. After 3 months of stable operations, there is no downtrend for catalyst activity, pressure differential of system is stable and there is no blockage. Compared with the medium and high temperature selective catalytic reduction (SCR) by estimation, the consumption of blast furnace gas could be reduced by about 30%, which verifies its feasibility.

The ceramic ball is with such characteristics as low density, good wear resistance and long service life so that energy consumption could be reduced by over 15%. In order to reduce energy consumption and improve regrinding efficiency of iron rough concentrate of a magnetite beneficiation plant, the characteristic tests of ore grinding with different grinding media including ceramic ball, steel ball and ceramic ball+steel ball are carried out by taking the sand setting materials of secondary grading in the beneficiation plant as the research object. The test results showed that it was completely feasible to apply ceramic ball to replace part of steel ball as the grinding medium of secondary stage fine grinding.

The alkaline oxide pellet used for blast furnace ironmaking production in Baotou Steel is prepared with self-produced iron ore concentrate of Bayan Obo and part of Inner Mongolia magnetite concentrate by process of traveling grate-rotary kiln-rotating annular cooler. In the initial stage of industrial production of alkaline oxide pellet, the compactness of green pellet is poor, proportion of binder is high, compressive strength of finished pellet is low, amount of powder in process system is great and hot pellet is frequently discharged from rotating annular cooler so that on-site production is affected. In order to solve the above practical problems in pellet production, the performances of raw materials used in pellet production are optimized to improve compressive strength of alkaline oxide pellet. The specific surface area of raw materials used in pellet production is increased, compressive strength of alkaline oxide pellet is improved from 2 098 N to 2 358 N, amount of powder in process system is significantly reduced and the phenomenon of hot pellet discharged from rotating annular cooler is significantly reduced by processing the ore used for production of alkaline oxide pellet with the process of high-pressure roller grinding.

In this paper, the treatment project of circulating water with combined cycle power plant (CCPP) unit is introduced. In order to verify its feasibility of technologies, the proof scheme of near zero pollution discharge, corrosion and scaling is formulated, monitoring indexes and parameters before and after debugging are determined to ensure the technologies to be feasible and indexes to be controllable. Moreover, the process flows, equipment (facility) configuration and working principles are introduced. Various problems during debugging are solved to ensure smooth debugging and operations of the project so as to achieve the anticipated goals of controllable indexes, near zero pollution discharge and zero addition of reagent.

The exchange of 7 m coke oven is the heating equipment of coke oven. Its function is to heat blended coal through driving actuator by hydraulic system under the control of PLC (programmable logic controller） so that superior metallurgical coke is obtained. The heating with coke oven gas and mixed gas could be realized by actuator, the intelligent manipulation device. It is composed of three parts, gas system oil cylinder, mixed gas system oil cylinder and exhaust gas system oil cylinder. The function of exhaust gas system oil cylinder of exchange is opening the ventilation door and waste gate to discharge the exhaust gas generated during heating and combustion of 7 m coke oven. During the system operations, there is often the phenomenon of forward or reverse displacement of around 15 mm at the end of stroke for piston rod of exhaust gas oil cylinder, which causes the electrical tracking signal to be lost so as to form fault state and develop into accident of drop-dead halt. The one-way throttle valve of original control system is changed to EMDV-10-N-C2-0-24DL magnetic exchange valve after analysis so that fault points are eliminated and operating accuracy of equipment is recovered.

The bake hardening steel is with good deep drawing properties and dent resistance, so it is usually used for stamping exterior covering parts of automobile. The cold rolled ultra-low carbon bake hardening steel HC220B is successfully developed by adding a small quantity of Ti into ultra-low carbon steel based on customer requirements as well as with the production mode of continuous annealing based on existing production equipment of such production lines as steel making, hot rolling and cold rolling in Rare Earth Steel Plate Co. of Baotou Steel. The mechanical properties of steel strip could meet the standard requirements so that the yield strength is 220~270 MPa, tensile strength is 320~400 MPa, percentage elongation after fracture≥32.0%, n -value≥0.16, r -value≥1.5, BH₂ value≥30 MPa, metallographic structure is equiaxed ferrite and grain size is grade 8.5 for finished product. When the content of solid solution free carbon in steel is within the range of 3~21 ppm, cold rolled bake hardening steel HC220B is with suitable bake hardening values. The mechanical properties of steel strip could still meet the standard requirements after it is stored at room temperature for over 3 months, so it is with good aging. When the content of free carbon reaches 58 ppm, steel strip ages rapidly and its yield strength is increased by approximately 40 MPa after it is stored at room temperature for 1 month, which is unfavorable to stable use of customers.

In this paper, the rare earth wear resistant steel NM450F of Baotou Steel is selected to carry out the experimental study of welding and Lincoln low alloy steel welding wire is selected to weld. The welding surface is smooth, surface quality inspection could 100% meet the ISO standard and flaw detection quality of magnetic powder is grade I. The internal flaw detection quality of weld seam could reach grade I as well as there are not such phenomena as incomplete penetration and fusion, which indicates that the surface quality and internal quality of welding are both excellent. The tensile strength of welded joints is greater than 780 MPa, average impact energy at -60 ℃ is greater than 95 J in weld zone and greater than 160 J in heat affected zone, which indicate that the mechanical properties of weld seam for NM450F steel plate could meet the operating requirements of carriage at low temperature working conditions of -60 ℃. The test results of heat input quantity, preheating temperature, welding parameters of interlayer temperature, mechanical properties and hardness values showed that NM450F material could be with good welding quality and welding technological properties under the condition of conventional welding parameters.

During the heat treatment process of high carbon rail, it is easy to generate such defective microstructure as intergranular network cementite. In order to systematically explore heat treatment characteristics of the material, the effect laws of microalloying and heat treatment on microstructure characteristics of high carbon rail are studied with scanning electron microscope (SEM), electron back-scattered diffraction (EBSD) and energy spectrum analysis by designing several differentiated heat treatment schemes. The results showed that there were certain effects of heat treatment temperature on distribution of alloying elements, size of pearlite structure as well as formation of intergranular network cementite and carbide particles.

In the paper, the dynamic precise control of angle and tension at tail end is realized through innovating control program of looper and developing function module of stepwise deceleration for rolling mill at tail end of strip aiming at such industry challenges as back end whip, breakage due to rolling and equipment damage caused by tension fluctuation at tail end of strip in the production of hot continuous rolled low alloy high strength thin strip. With the adjustment mechanism of matching parameters based on specifications, tension at tail end of strip could be automatically adjusted as needed so as to avoid the drawback of frequent adjustment for traditional manual intervention. The industrial applications show that the times of unplanned roll change caused by accidents of back end whip and breakage due to rolling each month are significantly reduced as well as expected annual loss is reduced by CNY 3 million Yuan with the technology, which could provide a new path for stable rolling of thin strip.

In the paper, it is introduced the installation and construction method of traction for cylindrical shell of cement pulverizer without large crane under the working condition of capping of frame for factory building combining with engineering practices. The method is fully combining with site conditions and convenient to be implemented. Practices prove that it is with such characteristics as safe, economic and efficient, which is with application values for the similar situations.

Non-oriented silicon steel is the core material for manufacturing iron core of motor as well as its performances directly determine the efficiency and service life of motor. Texture is one of the key factors affecting performances of non-oriented silicon steel, so it is necessary to research its evolution laws for improving product performances. In this paper, the textures of hot rolled plates, cold rolled plates and annealed plates with non-oriented silicon steels of different chemical compositions are detected as well as evolution laws of textures for non-oriented silicon steels with different production processes are studied with X-ray diffractometer. The results showed that there were no significant effects of chemical compositions on main texture types and strength of each texture was slightly improved by increasing Si content. The main texture type of hot rolled plates is Goss texture as well as the main texture types are α texture and γ texture after the treatment of pickling and tandem cold rolling process with total reduction ratio of over 80%. In the annealing process, the main textures of grain are γ texture and a small amount of Goss texture with the process of recovery, recrystallization and grain growth. The transformation of texture types with different production processes is related to different grain and matrix orientations. The texture types and strength of finished products could be optimized through the coordinating cooperation of such processes as hot rolling, cold rolling and annealing.

In the paper, it is introduced a kind of cooling device for pressing components of press machine is designed and proposed by comprehensively analyzing the reasons of wear for hot mold of press machine in the production line of hot briquette iron and studying the cooling measures of hot mold as well as cooling effect is obvious, with which the problem that temperature of hot mold is so high that strength is significantly decreased caused by long-time contact with high-temperature materials could be effectively avoided and service life of hot mold could be increased.

The failure of belt deviation for belt conveyor happens occasionally and it is more harmful. On the one hand, it causes accelerated wear of belt so that service life of belt is reduced and equipment costs are increased; on the other hand, it also easily causes such accidents as tearing and breakage of belt. In the paper, the causes of belt deviation for belt conveyor are found out through analyzing the force conditions of belt at the position of components of belt conveyor contacting with belt as well as corresponding adjustment measures are formulated to prevent and dispose the failure of belt deviation in time so that the above accidents of belt conveyor caused by belt deviation are avoided. Moreover, the on-site sprinkling of materials and operation burden of operating personnel are reduced to guarantee the efficient and eco-friendly productions of enterprise.

In this article, it is introduced such three aspects as the background, direction and significances of establishing the intelligent party building platform driven by digitization, platform architecture and introduction of functions as well as innovation research and applications of party building platform. Such modules as information management of party affairs, information visualization of party affairs management, casting soul of party building brand, collaborative communications of knowledges and mobile assistant of party building are established so that the digitization and intelligence of party building work are realized as well as convenient management of the entire process of party building work is promoted.

In the paper, the causes of common faults for vacuum on-load tap changer of transformer are systematically analyzed and improvement measures for its reliable operations are deeply discussed aiming at the key effects of its operation stability on power system security. It is found by analysis that the causes of faults for on-load tap changer are various. The service life of equipment is increased, downtime is reduced and overall operating efficiency of power system is improved through such measures as optimization design and model selection as well as normalizing installation and commissioning. Moreover, it is aimed to provide the comprehensive troubleshooting ideas and effective improvement scheme of reliability for operation and maintenance staff of power to ensure the stable operations of vacuum on-load tap changer of transformer so that the reliability of bulk supply for power system is improved.

In the paper, the risks of short circuit for outdoor bus bar caused by foreign objects are indicated through analysis aiming at the accident of protective trip for longitudinal differential of main transformer due to short circuit of AB phase for 10 kV exposed bus bar caused by birds in 110 kV substation. The feasibility for retrofitting bus bar insulation of iron and steel enterprise with the self-fusing tape of silicone rubber with radiation crosslinking is discussed combining with the trend of insulation technology. Moreover, it is elaborated that the material is with such advantages as high temperature resistance, self-fusing sealing and weather resistance. The problem of short circuit caused by lapping of foreign object is completely solved by applying the material in 10 kV bus bars of Baotou Steel so that maintenance free and safe operations are achieved, which could provide long-term protective scheme for the industry.

In the paper, the core operation risks and management challenges facing in such high risk scenes as high temperature molten metal area, special equipment and finite space are deeply analyzed by taking a large rail and beam rolling plant as the typical case aiming at the grim reality that the incidence of accidents is high in maintenance and repair operations of contractors in the metallurgical industry. It is found that the accidents are caused by such key management defects as formalization of examination and verification of qualification, omission of process monitoring as well as insufficient emergency coordination through this study. In this study, a set of closed loop safety management optimization system covering the entire process of “access-monitoring- acceptance” is proposed and established to solve these problems. The core content of the system includes establishing three-dimensional access, examination and verification model integrating “qualification inspection-technical capacity assessment-credit assessment”; developing and applying management platform of digital work permit to realize process standardization and dynamic supervision of risks; designing and implementing regime of concurrent technical disclosure and safety disclosure as well as mechanism of cooperation of proprietor and contractor; establishing linkage mechanism of blacklist based on performance assessment. The paper is aimed at improving the essential safety level for operations of contractors in metallurgical enterprises as well as providing theoretical references and practice paths for innovating safety management patterns in the industry through systematic optimization.

In this paper, the content of FeO in sinter is determined with pressed power pellet-X-ray fluorescence spectrometry. The method for determining content of FeO in sinter with X-ray fluorescence spectrometer is established with diffraction channel configured by Simultix 15 X-ray fluorescence spectrometer. The detection range of the method is 5.88%~13.00% and linearly dependent coefficient of the calibration curve established could reach 0.999. The detection speed is fast and analysis results are accurate with this method, which could replace classical wet chemical method to analyze the FeO in sinter on site.

In this article, it is introduced the hidden dangers found by on-site safety inspection of 15 small and medium-sized metallurgical non-ferrous enterprises in a west area are with classification and tabulate statistics in accordance with the Judgment Criteria of Major Potential Accidents in Industrial and Trading Enterprises and the Classification and Codes of Hazardous and Harmful Factors in Production Process. Moreover, the own problems of small and medium-sized metallurgical non-ferrous enterprises, mutual problems of enterprises as well as their causes are further analyzed with the function of pivot table of Excel combining with data analysis aiming at the current situations of safety work in enterprises. As a result, a series of measures and suggestions for improvement are proposed for safe development of enterprises and regional industries, which are with reference significances for improving safety management and compliance in large-scale metallurgical non-ferrous enterprises and other industrial and trading enterprises.