In the paper, it is introduced the organizational structure of remote centralized control system for air-compress station in Power Supply General Plant of Baotou Steel and applications of intelligent control system for power pipe network. A type of automatic control system suitable for remote control of air compressor is developed through exploring the processing properties of air compressor. Its applications in the performance control, anti-surge control and loop decoupling control of air compressor could make air compressor stabler and safer in remote operation.

In the field of space launch, the filling system of liquid oxygen relates to whether launch mission is successful or not, so the measurement of flow velocity for liquid oxygen is crucial. The vortex flow meter is often used as its measuring instrument due to its advantages such as stable performances and wide ranges. It is found that the vortex street coefficients of vortex flow meter show different characteristics at low and high flow velocities through experimental simulation so that the precision of vortex flow meter is poor at low flow velocities. In order to explore the change characteristics of vortex street coefficient for vortex flow meter at low and high flow velocities, the simulation experiment of vortex street flow field with flow velocity of 1.0~10.5 m/s at inlet is carried out as well as the relational graph of vortex street frequency and inlet velocity is obtained. Moreover, the fitting curve of vortex street frequency and vortex street coefficient is obtained through fitting curve. Finally, it is found that the fluid flow velocity obtained by curve fitting is more accurate through calculating flow velocity with the obtained vortex street coefficient curve and average coefficient.

The metering data of energy is the basis for quantitative management of enterprise energy and realizing cost accounting as well as the important guarantee for establishing scientific and effective energy management system. The prediction model of priority and state for weighing apparatus is established as well as the optimal strategy of metering equipment is formulated through the technical researches of hot metal balance and early warning of equipment as well as analyzing the process flow related to hot metal balance between iron-making and steel-making processes. Moreover, the system based on visual data is designed for intelligent identification and judgment of relevant data of equipment, realizing automatic adjustment of metering device priority, early warning of anomaly, improving accuracy of metering data as well as eliminating metering objections scientifically and effectively so as to provide technical supports for hot metal balance between iron-making and steel-making processes, reduce the costs of per ton of steel, improve product quality and benefits as well as help the fine management of each factory and mine.

During the operation of generator set in a plant, there is the problem that the current of exciting carbon brush for generator is unbalanced as well as the current and temperature of carbon brush are high. The factors for unbalance of current for carbon brush are such as the low quality of carbon brush itself, mixed application of multiple-model carbon brushes and increase of contact resistance during operation of carbon brush through analysis. As a result, such improvement measures as replacing high-quality carbon brush with the same model and batch, adjusting spring pressure of brush holder for carbon brush as well as strictly implementing assembly process of carbon brush. Moreover, the corresponding preventive measures are put forward. After the improvement, the problem of unbalance of current for exciting carbon brush of generator is obviously improved.

The iron ore samples are decomposed with the hydrochloric acid and hydrofluoric acid. After the perchloric acid smokes and silicon is eliminated, it is then extracted by butyl acetate solution of 1-phenyl-3-methyl-4- benzophthalide-5(PMBP). The interference elements of thorium are eliminated by the reextraction with hydrochloric acid, arsenazo III is as color developing agent and forms purple-red chelate with thorium ion as well as the thorium content in iron ore is determined with spectrophotometer. In the paper, the selection of acidity for extraction and reextraction, effects of such factors as acidity of chromogenic reaction, amount of color developing agent and color developing time on determination are discussed as well as experimental parameters are optimized. At the maximum absorption wavelength of 660 nm, the linearity range of thorium is determined to be 0~1.0 μg/mL, correlation coefficient is not less than 0.999 and detection limit is 0.000 44 μg/mL. This method is easy and simple to operate, molar absorption coefficient of the complex formed by arsenazo III and thorium is up to 0.8×10⁵ L/(mol·cm), which is with higher sensitivity. The adding standard recovery of thorium in the analysis results of samples is 96.8%~105.8%, so the method is with good precision and accuracy.

The comparison tests for corrosion resistances of samples with and without black spots on the surface of Zn-Al-Mg coating as well as the pure Zn coating are carried out with the neutral salt spray tests. There was not red rust for the samples with and without black spots on the surface of Zn-Al-Mg coating with the neutral salt spray tests of 2 000 h and 4 000 h, while there was obvious red rust for the sample with pure Zn coating with the test of 2 000 h and it was increased obviously with the test of 4 000 h. The positions with and without black spots of Zn-Al-Mg coating are analyzed with the scanning electron microscope and energy disperse spectroscopy. The results showed that many fine magnesium-rich eutectic structures were enriched at the position with black spots. There were differences for reflection of light between them and stripy eutectic structure at the position without black spots as well as the magnesium-rich eutectic structures were easily to be oxidized by the oxygen in the air so as to form black oxide so that the visual differences appear black spots. The salt spray test results showed that the corrosion resistance at the position with black spots didn’t deteriorate as well as the corrosion resistances of samples with and without black spots on the surface of Zn-Al-Mg coating were the same good.

The stability of rock slopes is mainly controlled by the spatial composing relations between the developmental structural plane in slope rock mass and slope. The stereographic projection is to project the interaction cutting relation of slopes and structural plane space onto a plane, with which the failure types and stability of rock slopes could be intuitively and preliminarily analyzed to provide support for the subsequent treatment of rock slopes. The analysis and determination for failure types and stability of rock slopes with polar stereographic projection are introduced by taking the stability evaluation of rock slope for 2^# open pit of Shuangli Iron Mine of Inner Mongolia Shuangli Mining Co. , Ltd. as an example as well as the prevention measures for unstable rock slope are proposed based on the failure types of slopes.

The axle housing is one of the main components of traveling system for vehicle. The 650QK steel developed in laborotary is with the component design of medium carbon as well as trace amount of Nb, Ti and V alloy elements are added, the microstructure is fine and even ferrite, pearlite and bainite, grain size is grade 12~13, yield strength is 664~671 MPa, tensile strength is 762~794 MPa, elongation is 20.0%~21.5%, cold bending property and low temperature impact toughness are good, low temperature impact toughness at -60 ℃ reaches 127 J, ductile-brittle transition temperature is lower than -60 ℃, ultimate fatigue strength is 270 MPa as well as synthesized mechanical properties of material are good, which could provide the technical index of basic performances of material for industrial production.

In this paper, the 390 MPa grade test steel for offshore platform is obtained with the component system of low C, high Mn and Nb-Ti microalloying and reasonable adding sequence of alloys during smelting as well as the controlled rolling and controlled cooling process. The test results showed that the upper yield strength was 488 MPa, tensile strength was 550 MPa, elongation after fracture was 30%, longitudinal and transverse impact energies at -20 ℃ were 242 J and 155 J; the microstructure was fine ferrite and pearlite as well as the inclusions were fine and with the size of 2~3 μm; after the welding thermal simulation test with welding heat input of 100 kJ/cm for test steel, the mechanical property test and metallographic structure were with the basic characteristics of steel with large heat input welding as well as the products are verified to be with good low-temperature impact toughness and welding performances.

In this paper, it is mainly introduced the influencing factors and control main points of the resistance to hydrogen sulfide stress corrosion for oil casing. In order to meet the usage requirements of high strength oil casing resistant to hydrogen sulfide corrosion, the oil casing resistant to hydrogen sulfide with independent intelligent property rights is manufactured through selecting Cr, Mo, and Ti as the main corrosion resistant alloy elements, strictly controlling contents of S and P as well as reasonably optimizing microalloy elements. Its impact absorbing energy at 0 ℃ reaches over 100 J, so it is with both high strength and toughness as well as they match reasonably so that it is with good resistance to hydrogen sulfide corrosion.