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.