With the development of global economy, the energy poor and environmental pollutions are becoming increasingly serious as well as low carbon and environmental protection, energy conservation and emission reduction have become the focus of global attention. In this context, Baotou Iron & Steel (Group) Co., Ltd. actively responds to the call of the country, promotes elimination and replacement of old-fashioned diesel locomotives, which are committed to achieving green and low-carbon railway transportation. In this article, the transformation ideas, technical solutions and practical application effects are discussed by taking the research and development and application of pure electric locomotives in factory region of Baotou Steel as object of study. The practical application shows that the effects of pure electric locomotives on saving energy as well as reducing consumptions, carbon emissions and noises are significant. The research of this article provides the solutions for green railway transportation of all industries as well as practical references for promoting green transformation of rail transit equipment in our country and high quality co-construction of the “Belt and Road”.

In the paper, the typical rollover defect at edge on surface of stainless steel plate is studied. The morphology, microstructure and composition of cross section for rollover at edge are analyzed by metallographic microscope and scanning electron microscope. It is found that the rollover defect at edge has formed on hot rolled intermediate billet as well as micro morphology is the crack with opening pointing to edge and there is delamination for subscale, which is caused by uneven transverse deformation of metal in rolling process under high temperature condition. According to this, a type of formation mechanism of the defect is proposed. This defect could be reduced or even eliminated through effective prevention measures so that the impacts of it on yield of finished products could be reduced.

With the advancement of information construction for iron and steel enterprises, the data volume generated in various production technology process links is increased significantly, especially the data for raw materials and logistics of iron and steel, which shows universality, relevance, diversity, dynamism and complexity. In order to explore data values fully, the data warehouse of raw materials is successfully established, visualization management and deep analysis for raw material data of steelmaking are realized as well as mining, processing and analysis of data for raw materials and logistics of iron and steel enterprises are completed successfully with the big data platform, combining the ETL(extract, transform, load) data extraction technology with converging and developing personalized data aiming at the data for raw materials and logistics of steelmaking for a steel mill.

The 590CL wheel steel is formed by spinning and stamping technologies to be made into automobile spoke. There is cracking in the process of stamping air hole. The cracking position is determined to be between the air hole on outer edge of spoke and shear end as well as fracture origin is at the air hole end of wheel steel, which is about the central part of plate thickness through macroscopic observation of cracked wheel steel as well as such comprehensive analysis as scanning electron microscope and metallographic examination; the zone of segregation in the core of wheel steel with inclusions those are mainly C and Nb in shape of dot string could all hinder normal deformation of ferrite in pre-forming process so that the fluidity of metal is inconsistent. As a result, the work hardening is generated and stress concentration in segregation in the core induces cracks, then stress is released through punching so that cracking is caused. It is suggested to adjust the composition to ensure appropriate proportions of niobium and carbon as well as optimize processes of steelmaking, continuous casting and rolling in the future production and processing processes.

With the increasing development and utilization of marine resources, corrosion of structural materials of marine engineering is facing severe challenges. In this article, it is summarized the research progress on corrosion status of steel in marine environment as well as deeply analyzed such influencing mechanisms as marine atmosphere, splash zone of seawater, tidal and splash zone as well as immersion zone of seawater on corrosion behavior of steel. The main current technical measures to retard corrosion of steel in marine environment are summarized as well as development direction and application prospect in future marine engineering of new corrosion-resistant steel are discussed by discussing the effects of such environmental factors as dissolved oxygen, salinity, temperature, pH value and microorganism on corrosion rate of steel aiming to provide the technical support for improving corrosion resistance of structural materials of marine engineering.

Such parameters as the outlet temperatures of crystallizer and secondary cooling section and shell thickness of manufacturing 2 types of rectangular billet with cross-section dimensions of 280 mm×380 mm and 320 mm×415 mm are simulated through high temperature thermal simulation experiments and computer software as well as the production process parameters of manufacturing YQ450NQR1 weathering steel with the billets of 2 different cross sections are compared. The results showed that the low magnification quality of billet was related to amplitude of crystallizer, amount of secondary cooling water, number of strands for continuous casting machine and temperature of exiting secondary cooling section while entering tension leveler. With the decrease of amplitude of crystallizer, increase of number of strands for continuous casting machine and temperature of entering tension leveler, the quality of billet is improved. When the amplitude of crystallizer is ±2.5 mm and temperature of entering tension leveler is greater than 940 ℃ with the condition of weak cold secondary cooling water, the low magnification quality of billet with cross section of 280 mm×380 mm of peritectic weathering steel is better than that of billet with cross section of 320 mm×415 mm.

As one of key materials in the new energy automobile industry, non-oriented silicon steel for driving motor of new energy automobile is with broad application prospects and huge market potential. In this paper, it is discussed the performance indexes of non-oriented silicon steel for driving motor of new energy automobile as well as briefly summarized current research status of non-oriented silicon steel on such aspects as rare earth modification, optimization of annealing process and practical applications of motor. The overall performances of non-oriented silicon steel for driving motor of new energy automobile could be significantly improved by adding rare earth elements into non-oriented silicon steel, continuously optimizing annealing treatment process and making targeted improvements combining with the requirements of practical applications of motor.

In this paper, the continuous cooling transformation (CCT) behavior of undercooled austenite and hardenability at different quenching temperatures of 770 MPa grade steel for crane boom are systematically studied. The critical transformation points of test steel are determined and evolution rules of metallographic structure for test steel at different cooling speeds are analyzed through thermal simulation test. The results showed that complete martensitic structure could be obtained when cooling speed reached above 30 ℃/s. The depth of hardening layer corresponding to 50% of martensitic structure content was 30 mm when hot quenching was at 920 ℃, which showed that test steel was with good hardenability.

In the detection of building foundation piles, crosshole sonic logging is the important detection method to judge the integrality of pile body for cast-in-place concrete pile. In this paper, it is introduced the basic principle and judgment basis of detecting integrality of pile body with crosshole sonic logging as well as summarized the process flow and matters needing attention of on-site detection by taking the project of archives center in a city as an example, which provide accurate detection data for the quality of foundation pile in project.

In this paper, it is introduced the development process and achievements of beneficiation technology study of baiyuneboite. The study and application situations of beneficiation technology of baiyuneboite are introduced from such three stages as focusing on iron, paying equal attention to iron and rare earth as well as comprehensive utilization of resources. Moreover, it is summarized the methods for improving grade and recovery rate of iron concentrate, current situations of beneficiation of rare earth oxide, achievements of beneficiation of fluorite as well as breakthrough of beneficiation technology of niobium mineral.