The smelting and rolling of hot rolled U75V rails with different contents of rare earth Ce are carried out in laboratory. The low temperature impacting property and fracture toughness of the rolled rail are compared and analyzed. The test results showed that the impact toughness of rail at room temperature could increase by about 30%, low temperature impacting property at -60 ℃ could increase by about 60% after add 0.005 6% rare earth Ce into hot rolled U75V rail; the average value of -20 ℃ K_IC of rail increased by about 14% and the average value of -60 ℃ K_IC of rail increased by about 15% so that the addition of rare earth Ce could further improve the low temperature toughness of hot rolled U75V rail.

In the paper, it is summarized the necessities of establishing statistical system for archives by analyzing the current situations and existing problems of archival statistical work in group company as well as elaborated the archives management system in detail from such four aspects as the function design, technical route design, practical application and prospect combining with some experiences of the statistical management of archives in Baotou Steel. The human and material inputs are saved as well as the costs of archives management for group company are reduced through the standardized management and networking applications of statistical system for archives in group company.

In this paper, the cold rolling process of high magnetic induction oriented silicon steel 27QG090 is explored and studied with the cold rolling testing system of pilot scale test platform as well as the microstructure and macroscopic XRD texture of samples after cold rolling in laboratory are analyzed with the Zeiss microscope and X-ray diffractometer. The study results showed that its microstructure after cold rolling with different reduction ratios was fibrous that elongates along the rolling direction and shear bands in the uneven deformation zone could be observed. Its texture after cold rolling in laboratory was mainly the α texture and a little {001}<110> rotated cubic texture as well as cold rolling specifications preferred 0.27 mm and 0.23 mm. The macro texture of cold rolled sheet for industrial trial production consists of α texture and a small amount of rotated cubic textures, which mainly concentrates in {114}<110> and {115}<110> textures so that the microstructure and texture are consistent with those of cold rolling in laboratory.

In this paper, the chemical composition and annealing process of galvanizing process for hot-dip galvanized fingerprint resistant sheet DCJD2+Z for household appliances are designed. The effects of different annealing temperatures on the metallographic structure and mechanical properties of steel strip DCJD2+Z are studied with such analysis methods as optical microscope and universal tensile testing machine as well as the process of DCJD2+Z products is determined combining with the using status of users. When the galvannealing temperature is 810~840 ℃ and elongation of temper mill is 0.6%~1.2%, the mechanical properties and formability are good to meet user requirements.

In this paper, the cognition for ore genesis of iron, rare earth and niobium of Bayan Obo is put forward with comprehensive geological research means through surface geological survey, geostatistics, element spatial concentration regularity as well as researches of the latest deep drilling data and fluid inclusions. It is considered that the iron, rare earth and niobium ores are the genesis of igneous carbonate magma accompanied by multi-period hydrothermal metasomatism in later period, which provide important basis for Bayan Obo to establish the prospecting model, conduct metallogenic prediction and evaluation as well as accurately search for resource target regions.

The expense allocation of auxiliary production unit of Inner Mongolia Baotou Steel Union Co., Ltd. is studied in detail. The expenses are allocated to all the units based on their nature and actual services provided. As a result, each unit knows the expenses they bear more clearly, intuitively and transparently, which could provide the reference for auxiliary units to better provide market-oriented services next. At present, this method has been applied to the monthly cost accounting of company and the effects are good so that all units pay more attention to the cost control.

In the paper, the realization process and approaches of cost system in company are elaborated in detail by taking Qinghua Co. of Baotou Steel as an example. The accurate cost accounting and efficient cost management are realized with the cross-platform and cross-system modes the first time so that work procedures of cost business personnel are simplified and working efficiency is greatly improved. This mode is convenient, fast, efficient and with specific task allocations, which provides the feasible references for successfully implementing other subsequent information management systems.

In this paper, the three dimension(3D) modeling software is used to design the funnel-shaped fossula rotunda at iron notch suitable for large blast furnace, the manufacture method of funnel-shaped fossula rotunda at iron notch for monoblock casting is summarized as well as its technical characteristics and application in 7^# and 8^# blast furnaces of Baotou Steel are introduced. The experiment results showed that the service life of funnel-shaped fossula rotunda for monoblock casting was greatly improved and labor intensity of furnacemen was reduced, which were to the benefit of stable and trouble-free operation of blast furnace.

The tubular belt conveyor is the main tool for materials transportation in modern productions. In the paper, the causes of such faults as off tracking, rolling over, tearing and tube expanding of belt for tubular belt conveyor are found out through analyzing its working principle and common various faults in operations in detail. As a result, the devices for preventing off tracking, tearing, spillage and tube expanding are manufactured and installed so that the loss of belt and fault rate of tubular belt conveyor could be effectively reduced as well as the normal operations of production are ensured.

In order to improve the charge discharge efficiency of nickel metal hydride (Ni-MH) battery at high temperature and meet the requirements of service environment, the charge and discharge performance of Ni-MH battery at high temperature are tested by adding NaOH into the conventional electrolyte. The experiment of comparing the charge discharge efficiency of Ni-MH battery added NaOH electrolyte with that of conventional Ni-MH battery is carried out at the environment temperatures of 55 ℃ and 65 ℃ separately. The results showed that the charge and discharge performance of Ni-MH battery added NaOH electrolyte was obviously higher than that of conventional Ni-MH battery in high temperature environment. The charge discharge efficiency is about 3 percentage points higher than that of conventional battery in high temperature environment of 55 ℃ and it is about 17~20 percentage points higher than that of conventional battery in high temperature environment of 65 ℃.