The data transforming relationship of nitrogen for as-fired coal in solid and gaseous phases is established through the comprehensive study of nitrogen in metallurgical coal concentrate for 6 m coke oven of Baotou Steel, which could provide the data guidance for adjusting coal blending ratio, reducing nitrogen content in coke and ammonia content in coke oven gas as well as the theoretical basis for formulating modification scheme of gas purification system of Baotou Steel and design of matched coke oven flue gas desulfurization and denitrification for 6 m and 7 m coke ovens.

The grade of fluorite in superconducting concentrate is increased from 85.21% to 96.84% and the grade of rare earth is decreased from 5.29% to 0.11% after the fluorite flotation concentrate of Bayan Obo Iron Mine is processed by superconducting magnetic separation technology. The grade of fluorite in fluorite flotation concentrate of Bayan Obo Iron Mine can be effectively improved, content of rare earth is decreased, flotation process of fluorite concentrate is shortened, amount of reagents and other power consumption are reduced with the superconducting high gradient magnetic separation so that the costs are effectively saved.

In this article, it is introduced the current situation of bulk flotation process flows of a Fluorite Concentration Plant in Bayan Obo as well as analyzed the problems existed in operation process and the reasons that the indicators do not reach standard. The concentration is changed from two stages to one stage through industrial tests so that the better production indicators are obtained and the production and processing costs are reduced in production practices.

The suspended matter content in the circulating water of beneficiation production is high, so it needs to be treated by adding reagents. The suitable reagents are selected as well as such operation parameters as the dosage and way of adding reagents are determined through experiments. After the applications, the minimum suspended matter content of treating water is reduced to below 130 mg/L so that the water quality is greatly improved to meet the requirements of production water supply.

In this paper, the operation of fast cooling for warm-air pipe of 4 150 m³ blast furnace of Baotou Steel is summarized. The time limit for maintenance of pipeline system of hot blast stove is limited by cooling of refractory materials, conventional temperature fall time is longer and the process is out of control. The temperature of hot blast pipeline system can decrease fast through implementing this scheme and the whole process is always under control so that the time limit for maintenance can be effectively shortened.

The pelletizing process is the key link in pellet production. The quality of green pellets will directly affect quality of finished ball. The pelletization rate is increased from 75% to 81% and average drop strength of green pellets is increased by 0.3 times by taking such measures as improving drying effect of iron charge, intensifying high-pressure roller grinding process and optimizing parameters of pelletizer so that quality of green pellets is improved obviously.

In this paper, it is introduced the design scheme of nickel metal hydride battery pack in railway passenger cars as well as elaborated the necessities of replacing lead acid battery and nickel-cadmium battery with it from such aspects as safety, environmental protection and maintenance free. With the sealed nickel metal hydride battery system as redundant electrical power, there is no need to replenish it so that the workload of artificial maintenance for it is greatly reduced. It is with the management system of charging and discharging, which can monitor its such important parameters as the voltage, current, temperature and SOC in real time as well as monitor its usage status so that the safety of vehicle operation is improved.

With the development requirements of lightweight of automobile, the 590 MPa grade cold-rolled dual phase steel for structural parts is successfully researched and developed through the chemical composition design with C-Mn-Cr alloy system combining with reasonable hot rolling, pickling tandem cold rolling and continuous annealing processes based on the advanced equipment and technological characteristics of Baotou Steel in order to meet the requirements of car body safety and environmental protection. The mass production and application of users show that all the mechanical properties of cold-rolled dual phase steel HC340/590DP could meet the technical and user requirements.

The defect of transverse crack on surface is the folded mark vertical to rolling direction of steel belt and the defect of pickled SPHC product has been the main quality problem faced by production line since Rare Earth Steel Plate Co., Ltd. was put into production in commission, which seriously influences the yield and qualified rate. In the article, it is analyzed its mechanism, studied the effects of chemical components, coiling temperature, levelling process, decoiling temperature of pickling and deep bending roll on it as well as a series of related improvement measures are taken so that its occurrence rate is reduced significantly and the effects are better.

In the article, the principle of narrow lap welding and judgment methods for weld quality are clear and definite as well as the hardness impact of various martensite during rapid cooling for strip steel of this material and the CCT diagram of rapid cooling phase transformation for carbon steel are analyzed. The obtained drawing test results of weld are qualified and the fracture is not at weld in tensile test through adjusting welding parameters as well as increasing annealing process of weld so that the quality of weld seam is eligible in actual production.

The inclined Y-groove welding crack test, maximum hardness test in heat affected zone and rigid butt-joint cracking test for bridge steel Q345qDNH produced by Baotou Steel are carried out. The test results showed that the cold crack sensitivity of bridge steel Q345qDNH with thickness of 20 mm was not great and its cold cracks could be avoided without preheating or using the preheating temperature system of 50 ℃ in actual welding process.

The surface defects of DC04 steel are tested and analyzed by such testing methods as chemical composition analysis, metalloscope, tensile testing machine, scanning electron microscope and energy disperse spectroscopy. The results showed that there was a strip of 200 μm inclusion (type B) at defect and the inclusion of matrix exceeded the standard. The nonmetallic inclusions cause stress concentration, microcracks are generated during rolling so that surface defects are formed in punching process.

The N80 grade experimental steel for oil casing is developed with the microalloying composition design of C-Mn-Nb-Ti, smelting with low P and S as well as reasonable controlled rolling and cooling process so that the refined crystalline strengthening and precipitation strengthening are made full use of. Moreover, the continuous cooling transformation curve (CCT curve) of N80 grade ERW steel for oil casing is measured to study the effects of different cooling rates on products of phase change.

In this paper, such performances as drawing, impact, ductile-brittle transition temperature, torsional strength at room temperature and rotating bending fatigue of seamless steel pipe for V150 grade drill pipe body developed and produced by Baotou Steel are tested and studied. The results showed that such technical indexes as the conventional mechanical properties and grain size of as-heat-treated steel pipe could meet the requirements of DS-1^TM Standard Vol.1 Specification of Tubular Products for Drilling. At the same time, it is also with such excellent material characteristics as good transverse impact toughness, high low temperature impact toughness, low ductile-brittle transition temperature, high torsional strength at room temperature and good anti-rotating bending fatigue, which could meet the requirements of steel for V150 grade drill pipe body with super high strength.

The R320Cr steel is a heavy rail steel grade that can be used to produce heavy haul railway rail according to the European Railway Standards. Its main technical indexes include tensile strength ≥1 080 MPa, elongation ≥9%, range for hardness of tread center (HB) is 320~360. Its smelting composition range, production technology and operating points of each process are determined through the laboratory researches as well as its technical indexes in industrial production could meet the technical requirements of standard.

The 60 kg/m new profile rail is studied starting from wheel-rail contact relationship aiming at the use of rail in China, which is more suitable for current wheel-rail contact relationship. Its practicability is proved by periodical tracking observation and comparison on railway from such aspects as the changes of appearance, abrasion, size of new profile for rail and light band of tread center as well as the problems found in tracking observation are inspected and analyzed.

In the paper, the properties, microstructure, cost and yield of low-alloy high-strength hot-rolled H-beam with niobium vanadium and titanium microalloying by industrial production are compared on the premise of satisfying the technical indexes of product as well as they are analyzed and discussed in detail combining with the theories. The hot rolled H-beam with such three components as niobium, vanadium and titanium has advantages and disadvantages so that the microalloy system can be selected for production according to the actual situation of enterprise and market price of alloys.

In the article, it is compared and analyzed the effects of rare earth elements on the mechanical properties, metallographic structure and corrosion resistance of welded joints for weather-resistant bridge steel Q420qNH. The contrast experiment of performances of welded joints with the same welding process for weather-resistant bridge steel Q420qNH and Q420qNHRE is carried out using special weather-resistant welding wire. The results showed that the toughness, low temperature impact performance and corrosion resistance of welded joints for weather-resistant bridge steel Q420qNH could be improved effectively with the rare earth elements combining with the conventional mechanical properties, metallographic structure and salt spray corrosion test results.

In this paper, it is introduced the transformation of original circuit for locomotive aiming at such faults of DF7G locomotive in service as the traction motor cannot abstract heat due to ventilating blower does not run as well as excitation system of AC auxiliary generator is easily to be burnt out when start machine and generate electricity so that the normal operation of locomotive is ensured.

In this paper, the development and reuse of data generated by the ERP system of Baotou Steel as data source of heterogeneous system are introduced. The master-slave database is realized with HADR technology and the operation of reading data from heterogeneous systems is executed on slave database so that the bottleneck of performances for database could effectively be solved.

The measurement and detection is a key process to guarantee product quality as well as the accurate quantity value of measuring instrument and operation specification are the basis of reliable measurement. The quality track with test/calibration in the whole process is developed and test/calibration laboratory information management system with full life cycle management for measuring equipment of company as the core is realized by changing the traditional management mode based on processing data with single machine and transinformation relying on paper circulation. As a result, the accuracy and reliability of valuation transfer and traceability for measuring instrument of Baotou Steel are improved as well as the integrated management of such resources as laboratory personnel, equipment and data files are standardized so that the measurement management level of Baotou Steel is enhanced.

In the paper, the establishment of theoretical framework in line with the enterprise network security management system of Baotou Steel is explored according to network security status in our country as well as information security standards at home and abroad aiming at essence and target of network security.

In this paper, it is mainly introduced the principles of flow measuring probe technology and its applications in the information security of enterprise network as well as elaborated its specific application scenarios and functions in enterprises. The practical applications show that it is one of the important tools to ensure safe and stable operation of network.

In the article, the necessity of outsourcing digital processing for archives is obtained by analyzing the characteristics of collections of Archives Center of Baotou Steel. The quality management is elaborated from such three aspects as formulating work plans of quality management and digital implementation plans of archives as well as quality control of digital processing for archives combining with some experiences of implementing informatization project for archives of Baotou Steel.

In this paper, it is discussed the measures taken for safe operations of new 5 sets of flue gas desulfurization and denitrification systems in the existing 6 JN60-6 coke ovens of Baotou Steel. The safety in operation of heating system for coke oven is improved through such security settings as lifting device of gate valve, interlocks of draft fan and gate valve as well as draft fan and automatically stop heating of coke oven, establishment of effective emergency linkage mechanism between desulfurization and denitrification and main control room of coke oven so that the reliable safety guarantee for stable and trouble-free operation of coke oven is provided.