The filter material prepared by steel slag powder, blast furnace slag and coal ash is with the adsorption capacity as well as the coking wastewater can be treated with it. The test results showed that its absorption efficiency on COD and chroma was higher than that of ordinary steel slag particles, while lower than that of activated carbon. The test results proved that the absorption efficiency of solid wastes can be improved by preparing filter material with them after treatment.

The prediction of coke quality is very important, but the errors are larger. In this paper, the factors affecting predictive effects of coke quality are discussed, the process variables are introduced into prediction model and the big data method is used to study. Moreover, the reasons of errors are analyzed and the improvement suggestions are put forward.

In this paper, it is introduced the surface temperature of warm-air pipe of 7^# blast furnace hot stove increases suddenly, the effect of surface air cooling is not obvious. With the observation by damping down and opening pore, it is determined that the firebricks inside the pipe are with a great area of collapse. According to the degree of collapse, the mode of pouring followed by grouting is used in this area for leak repairing. As a result, the surface temperature of warm-air pipe is returned to normal and such serious accident as burning through of warm-air pipe is avoided.

In this paper, it is summarized the operational experiences of heat preservation for silica bricks of Kalugin top combustion stove for 4 150 m³ blast furnace of Baotou Steel as well as introduced the conditions, requirements and matters needing attention in operational processes of heat preservation with external burner for silica bricks of top combustion stove, which provide references for heat preservation of top combustion stove during the overhaul.

In this paper, it is introduced the fault of leakage for gravitational dust collector and cyclone dust collector in the raw gas system of two 4 150 m³ blast furnaces of Baotou Steel. The reasonable treatment measures are put forward and implemented through diagnosis and analysis. The structure modification is carried out according to the actual installation of equipment on site to realize the stable operations of equipment, which plays a positive role in stable and trouble free productions of blast furnace as well as can be used for reference in the maintenance of related equipment for other blast furnaces.

The rare earth alloys are added in RH treatment to study the effects of rare earth on inclusions based on the production process of low-carbon and low-silicon steel. The results showed that the number of large-grained inclusions decreased and the proportion of short grained inclusions increased compared with those before adding the rare earth when the content of rare earth in steel was 0.003 2%~0.004 1%. Moreover, the morphology of inclusions in steel was changed from spherical, cluster and strip to spherical as well as the type of inclusions was changed from oxide to rare earth sulfur-oxygen complex and rare earth oxide.

The sublance technology is adopted in the production with 240 t converter of Rare Earth Steel Plate Plant of Baotou Steel for the first time. During the whole campaign of converter, the measurement efficiency of sublance decreases from 92.4% to 88.1% with the change of bath level. The solutions to use of sublacne equipment are put forward through analyzing and researching existing production situations and equipment conditions as well as the measurement efficiency of sublacne is stabilized at 92.2%~93.9%. With the steady improvement of technical indexes of sublacne, the quality of molten steel for LF supplied by converter is improved, which creates good conditions for producing high added-value products.

In this paper, it is described the cleanness of liquid steel is improved by studying and optimizing the technologies of each working procedure for steel making; in the vacuum degassing treatment with RH furnace, the yield of rare earth in products could reach 50% by further come-up of inclusions in the circulation of liquid steel and adding rare earth element in late stage of vacuum treatment; the effects of adding rare earth element to decrease Nb content and the original chemical composition without rare earth element on product performances are studied.

In the article, it is introduced that the production method satisfying the demands of spot welding technology, production and inspection for downstream customers is found through adopting reasonable composition design as well as controlled rolling and controlled cooling technological measures on the basis of meeting the product performances of S250GD + Z galvanized steel strip. As a result, the manufactured galvanized structural steel could be with batch production and such characteristics as good formability and weldability, which provide product design direction for the downstream spot welding products.

In the paper, it is studied the preparation of cerium hydroxide with cerium chloride solution as raw material as well as investigated the concentration of cerium chloride solution, quantity of H₂O₂ added, amount of NH₃·H₂O and the effects of reaction temperature on oxidation rate of cerium in cerium hydroxide to determine the optimum technological conditions. The results showed that the cerium hydroxide with oxidation rate of cerium greater than 97%, w(Cl^-)<0.15% and could be dissolved in HNO₃ solution was obtained when the mass concentration of cerium chloride was 120 g/L, amount of H₂O₂ was 0.7 times of mass of CeO₂, amount of NH₃·H₂O was 130% of theoretical mass and reaction temperature was at 50 ℃.

The TG22 hot rolled steel strip for oil casing is manufactured with the microalloying composition of medium C and Nb, the smelting with high cleanliness as well as reasonable controlled rolling and controlled cooling process. It is with good overall performances, its microstructure is fine and homogeneous ferrite and pearlite, the grain size is grade 12.0, banded structure is smaller than grade 2.0 and the sum of all grades for inclusions is smaller than grade 4.0. It is with high dimensional accuracy, good surface quality and strip shape. The overall performances of products are good and could meet the operating requirements of J55 oil casing. The products are with bulk sales and successfully applied as well as their quality is well-reputed by users.

In the paper, it is introduced the coil plate for hot rolling automobile axle housing with yield strength of 355 MPa has been developed with the component design of medium carbon and high silicon, controlled rolling and controlled cooling process as well as 2 250 mm hot continuous rolling production line of Baotou Steel. It is with good matching of strength and toughness as well as cold bending property to satisfy the use of manufacturers for automobile axle housing so that the small batch production and supply of coil plate products for automobile axle housing by Baotou Steel are realized, which lay the foundation for the subsequent development of steel grades with higher strength levels.

In the paper, it is introduced the development of DH40 high-strength steel plate with studying the rolling and normalizing technologies, testing the mechanical properties as well as analyzing the microstructure and effects of normalizing technology on mechanical properties of steel plate combining with the test results. The results showed that the mechanical properties of steel plate could be adjusted appropriately by proper normalizing heat treatment process system. Due to the problem of center segregation for microstructure of plate, the process factors at each stage and their relation need to be explored continuously to eliminate the banded structure.

In the paper, it is introduced the X56M hot rolled steel strip is developed with the Nb-Ti-Mo component system and 2 250 mm production line. It is with stable mechanical properties, so it is suitable for stable industrial batch production as well as can meet the demand of pipeline steel market at home and abroad.

In this paper, the composition design, process parameters and results of trial production in laboratory for Q690CF high strength steel with rare earth and low welding crack susceptibility are introduced. Its strength level could meet the standard requirements as well as the strength and toughness match well by adopting reasonable chemical composition system, controlled rolling and controlled cooling as well as off-line quenching and tempering process; the component requirements of welding without preheating can be met by reducing the carbon equivalent (Ceq) and welding crack susceptibility index (Pcm) so that it is with an extensive market development prospect.

In the production process of 2 250 mm production line in Baotou Steel, the main quality problems are the problems of strip shape. Roller is the important large tool used in the production of hot rolling unit and its roll shape directly affects the ability of rolling mill to regulate and control strip shape. In the paper, it is introduced the corresponding technical researches on roll shape of roller in the rolling process of rare earth steel with 2 250 mm production line as well as the ability of rolling mill to regulate and control strip shape is enhanced through optimizing the roll shape of working roll for finishing mill group so that the roller can serve production better.

In the article, it is introduced the general situations for production process of 100-meter 75 kg/m U75V online heat treated rail with the 280 mm × 380 mm slab section adopted by Baotou Steel. Its industrial production is successfully completed through improving the ejection equipment of continuous casting in Steel-making Plant and commissioning the remaining heat quenching production line of Rail and Beam Plant. Its performance examinations could meet the requirements of TB/T 2344-2012 standard.

In the paper, it is introduced there is fracture in the process of drawing SWRH82B wire rod sample. It is found out that the main causes for fracture of 82B are high carbon content in the center of sample and existing fragility phase-network cementite through analyzing the SWRH82B wire rod sample, while the cause for high carbon content in the center of sample is the serious center segregation of continuous casting billet.

In this paper, the corresponding measures to such problems as large temperature fluctuations and disorder of model self-learning are formulated respectively through researching the problem of low hit rate for coiling temperature of thick strip steel produced with the hot rolling production line of Baotou Steel Metal Manufacturing Co. and analyzing with model theory combining with the actual situations. The optimization is carried out from such aspects as stabilizing rolling pace, controlling tapping temperature and model control so that the effects are good, which could be as the effective reference for formulation of production process.

In the paper, it is introduced the application of 611U in the automatic control system of gang saw in Steel Tube Co. and the upgrading scheme with S120, working modes of 611U and S120 in positioning control and the commmunication mode of Profibus-DP field bus in upgrade.

The extracting mill with shaft is the important component of PQF unit and the production practices prove that the center of stand cannot coincide with the center of roll pass in production due to there are not any detection methods for the center of stand for extracting mill with shaft at present so that 500~800 mm of head end for steel tube is bent in steel rolling process. In the paper, the method for measuring center of stand is found out by analyzing the structure of stand for extracting mill and improving the measuring implement.

The production line of Φ460 mm seamless steel tube in Steel Tube Co. of Baotou Steel adopts the world advanced PQF continuous rolling technology and the continuous rolling mill is with the retained rack of mandrel system. In the movement process of retained rack of mandrel, the fast speed response is required and the position must be accurate when it stops. For control, the position control mode of different positions of periods with different speeds is adopted to ensure reliable requirements for production and control. The torque balance control can effectively solve the problems of push-pull force and unbalanced load between motors.

In the paper, the influences of circulating water temperature and water quality on the economic benefits of coke dry quenching are analyzed. It is concluded that the circulating water system for coke dry quenching is fatal to its economic benefits through comparing various process parameter indexes of the system before and after overhaul, which aims to improve the economic benefits of coke dry quenching device by strengthening control of the system.

In the paper, it is comprehensively summarized the process adjustment and implementation of maintenance measures during the overhaul of single system for A/A/O biological reaction tank of sewage biological treatment system in Qinghua Coal Chemical Industry Co., Ltd. of Baotou Steel, which could be as the references for similar overhaul of water treatment system in future.

In this paper, it is introduced the study of corrosion for chain steel with the triethanolamine and ascorbic acid as inhibiter as well as the mixture of desulfurization waste water and slag water from Power Plants as corrosive medium. Its corrosion law is studied by such methods as the weight loss experiment, self-corrosion potential and electrochemical experiment. The experimental results showed that the degree of corrosion for test steel was the lowest and the corrosion-inhibition effect was better after add the inhibiter of triethanolamine into waste water.

In this paper, it is introduced the basic composition of scanning electron microscope and its technical advantages in the field of steel material. The focus is to conclude and analyze the typical application examples of scanning electron microscope in physical analysis and detection.

In this paper, it is introduced the construction method of maintenance with comprehensive method of heat accumulation for concrete in winter based on the thermodynamic calculation of maintenance and construction for concrete, which could be as the reference for the quality control of mass concrete construction in winter.