After ignition of No.8 blast furnace in Baotou Steel, add air volume smoothly, keep good pace, achieve a rapid reinforcement, and create the achievement of reaching the target production in 4 days after blow-in. In this paper, operation experience on blow-in and reaching the target production of No.8 blast furnace in Baotou Steel is summarized through increasing equipment reliability, making reasonable blow-in control parameters, optimizing the blow-in scheme, preparing carefully before blow-in and optimization in blast furnace operation.

The safe operation for pressure-bearing parts of waste heat recovery boiler is essential to the safe production of CDQ. Located in the waste heat boiler inlet, superheater is the most prone to leakage since it is the first to be eroded and worn by the high temperature recycle gas. In this paper, combined with the actual production of CDQ in Baotou Steel, analyzed the mechanism, reasons and practical measures of superheater tube burst to facilitate the superheater equipment to run well.

As the main equipment of the blast furnace, the feeding main belt has a direct impact on the normal production of blast furnace. Taking the design of the No.1 blast furnace main belt in Baotou Steel as an example, this paper focuses on the technical requirements of the blast furnace main belt design, as well as the safety precautions and maintenance measures, so that the blast furnace can start, run and stop safely and smoothly.

Aiming at the problems encountered in the actual production of the sintering machine desulphurization system, the key equipment such as pretreatment section, absorption tower and defogging section were overhauled on the basis of thorough analysis and consideration. For nearly a year after transformation, the desulphurization system has been running well, the technical indexes as well as the sulfur dioxide treatment capacity and the desulphurization efficiency have been improved to meet the requirements of environmental protection and the need of ironmaking production.

In this paper, it is introduced the early-stage preparation, scheme formulation and rapid recovery of long term blowing-down for the No.7 blast furnace in Baotou Steel. Through the analysis of the condition before blowing-down, the implementation of heat insulation during blowing-down and the response of influencing factors in the recovery process, by deep study and practice of the large-scale blast furnace blowing-down and recovery, a quick recovery method which is close to the quantification and standardization to achieve the purpose of rapid recovery of furnace condition is proposed.

Since blow-in in 2015, the No.8 blast furnace in Iron-making Plant of Rare Earth Steel Plate Co. in Baotou Steel has been running in good condition. However, the airflow distribution changes in March 2016, piping problems increased significantly and affected the furnace condition, the economic and technical indexes become worse. In this paper, the causes of the abnormal airflow distribution are analyzed and the measures taken during the abnormal period are summarized.

In this paper, it is studied the relationship of rolling oil lubrication system for rolling force, friction coefficient and the main motor current in the process of hot strip rolling, especially the rolling force of the finishing mill is large when the thin strip and the special steel are rolled, the wear of the rolls and vibration of the stand are serious. The use of rolling oil lubrication is an essential factor for the stable rolling of thin strip and special steel in the finishing mill. After rolling oil lubrication system is put into use, the roll loss, the number of roll changing, and energy consumption are reduced.

In this paper, the control mode and regulation mode of gas cooling system are analyzed in detail, the improvement scheme is put forward and implemented in view of the large energy consumption of the unit caused by the temperature influence of the combustion medium in the operation of M701S gas-steam combined cycle power plant in Baotou Steel. The improved system realized the optimization of the combustion medium during the operation of the unit and finally made the unit running in the most stable and economical conditions.

Based on the research of the coking dust reblending in coking plant, the feasibility of the test is verified, and the reasonable and effective use of this resource is made to save the cost and reduce the environmental pollution. Mean-while, according to the results, through discussion and screening, the feasibility scheme is successfully applied in industrial production, and has achieved considerable economic and social benefits.

Low temperature semi coke is a solid carbonaceous fuel of high volatile bituminous coal by pyrolysis obtained, with high fixed carbon, low ash, low sulfur, low volatile. The experimental research of blast furnace injection of low temperature semi coke shows that the explosion and grindability can meet the production requirements, and the combustion rate is better than that of the present mixed pulverized coal. If the low temperature semi coke can be used in the field of blast furnace smelting, it can relieve the pressure of anthracite resource and widen the range of injection coal source selection.

The influence factors of KR process, as well as desiliconization and dephosphorization pretreatment were studied by using 150 t ladle furnace. In this study, the reuse resources such as converter dust and iron oxide ball were used as the oxidant, and the desulfurizer was added into the ladle furnace at a certain ratio in the condition of KR hot metal pretreatment, the technological effect for simultaneous removal of silicon and phosphorus was sought factor. The result shows that remove part of silicon and phosphorus in molten iron is feasible, but the condition is harsh, the current production conditions can not be fully met.

In this paper, the chemical compositions, processing parameters and testing results of Q890D high strength steel were introduced. Through the design of reasonable chemical composition system, control of rolling and cooling process, and off-line quenching and tampering treatment, the high strength plate thickness is up to 25 mm with a yield strength of 930~970 MPa, tensile strength of 980~1 050 MPa, elongation rate of 13%~15%. The impact energy is more than 100 J, and the mechanical properties are excellent.

In this paper, the critical points Ac₁ and Ac₃ of Q690D steels with different boron content were measured by Formastor-F automatic phase change meter, and the continuous cooling transformation curve of Q690D steel was drawn. The result shows that the addition of boron made the Ac₃ and Ac₁ of Q690D steel increased slightly, Ms point and Bs point reduced, the critical cooling rate of Q690D steel decreased, however the hardenability improved obviously. Boron in Q690D steel has different degrees of delayed effect on proeutectoid ferrite transformation and bainite transformation, which inhibits the precipitation of proeutectoid ferrite. The complete bainite structure can be obtained in a wide range of cooling rate.

In this paper, the factors influencing the accuracy of the detection result are found out by analyzing the oxides cleanliness (K method) detection process for the exported rails. And the control measures are put forward to ensure the accuracy of the detection result.

The uncertainty in measuring result for metal Charpy impact test is evaluated with N80Q steel standard V type impact specimen as an example. The measurement uncertainty which can affect impact testing results is analyzed in detail. The components are calculated, synthesized and evaluated.

According to the requirements of 30CrMo steel pipe cold drawing performance, the 30CrMo steel pipe was normalized and annealed in the laboratory, of which the microstructure and mechanical properties were compared and analyzed after different heat treatment. The experimental results show that the microstructure of test steel after normalizing heat treatment is bainite + ferrite pearlite, and the mechanical properties of the material are hard to meet the requirements of cold drawing process. By using the annealing heat treatment process, both the microstructure and the mechanical properties of the material can meet the cold drawing process requirements.

The X70 pipeline steel of Baotou steel, its corrosion of the steel pipe surface is not serious after three years of exposure in the open environment and has similar corrosion morphology characteristics of the weathering steel. While placed in the same environment, the same time, the X70 pipeline steel of the domestic steel plant, its surface corrosion is more serious. In the paper, behavior rules of resistance to atmospheric corrosion for X70 pipeline steel of Baotou Steel are studied by using the cycle corrosion test for the comparison between the X70 pipeline steel produced by Baotou Steel and the domestic steel plant.

In the paper, seamless steel tube of No.20 high quality carbon structural steel which produced by Φ460 mm PQF continuous rolling mill in Baotou Steel is studied. Aiming at the situation that the yield strength of rolled seamless tube is low, the causes of the low yield strength are analyzed from the material specification, chemical composition, mechanical properties and their correlation. And the improvement measures are put forward to ensure the quality of the steel tube.

In the paper, it is introduced the large vibration of the slag vertical mill occurred in the early trial production, by adjusting the system volume, water volume within the mill, roller pressure, increasing process equipment, appropriately adjusting the dam ring height, proper control of feeding, appropriately adjusting the rotating speed of the separator and a series of technical measures to ensure that the operation results of slag vertical mill meet the design and requirement of production process.

The converter shell is an important component of converter body. The 150 t converter shell discussed in this paper is the main equipment in Steel-melting Plant of Baotou Steel. Its production process is the direct impact on the safe use and the expected useful life of the converter. Through the production practice of Baotou Steel Mechanical Equipment Company, test the rationality and feasibility of production process to meet the technical requirements of drawings and the requirements of relevant standards.

In this paper, it is introduced two functions, automatic control of position and the thickness in the roll gap control system, and the automatic position control scheme for the electric pressing and hydraulic pressing of the heavy plate mill in Baotou Steel, and AGC have compensation on head and zero position. Finally, the method for improving measuring accuracy of HCG cylinder and the low utilization rate of the roller is introduced to solve the problems encountered in the production.

In the paper, it is introduced PLC intelligent temperature control system is applied in Sintering furnace, aiming at the needs of control accuracy, high control and stable constant temperature environment in the process of permanent magnetic material production, meanwhile the temperature can be controlled within the error range of ±5 ℃. Use PID controller embedded in PLC and external temperature control circuit to achieve automatic temperature control.

Since the automatic sampling equipment has been put into use in Chemical Examination Center of Baotou Steel, the requirements for the accuracy of sampling, sample preparation and chemical testing process are very high. In the paper, aiming at remote automatic sampling realizing scientific sampling and reducing interference of human factors, having transformation for equipment hardware of remote automatic sampling system and improving software upgrades and management system, so as to improve the degrees of rationalization and realize integration of crude fuel management and control.

In the paper, it is introduced after the basis on introduction, digestion and absorption of Baosight MES system, according to own features, Heavy area of Baotou Steel extend the function of the original system and improve part of the function from the aspects of signing contract, production planning organization and finished products warehouse management, etc. So that it can be more suitable to the production and management mode of Baotou Steel and effectively improve the management level in Heavy Plate Area of Baotou steel.

ERP system is a management tool centralizing information technology and advanced management ideas that concerned by more and more enterprises at home and abroad. In the paper, it is introduced the basic concept of ERP system and the application of ERP system in Rare Earth Steel Plate Plant of Baotou Steel through the three aspects of production planning management, material management and quality management in steel-making process.

In the paper, it is discussed the existing problems and the corresponding measures in bidding and purchasing management of Baotou Steel based on the knowledge of the quality control of bidding management and the knowledge of economics and management principles involved in bidding and purchasing. Strengthen the management of bidding and purchasing from the aspects of perfecting the organization structure and the system, standardizing the business operation, strengthening the supervision and management, in order to ensure the economic benefit and the management benefit.

In the paper, the main work of transportation statistics and analysis of iron and steel enterprises is summarized by combining the actuality of railway transportation and summarizing the characteristics of statistical. And it is introduced a detailed description for the effective measures and methods adopted in the statistical work of railway transportation, based on the author's experience in the practice of statistics in railway transportation.

ERP (Enterprise resource planning) project was officially launched in May 2015 in Baotou Steel, during the process of implementation, the main focus is to resolve the contradiction between the human resources management concept of modern enterprise and the traditional management mode of state-owned enterprises. Based on the theory of ERP and human resources, this paper is summarized comprehensively and refined through the practice of ERP human resources system promoted in Baotou Steel, which provides a good reference for other enterprises to implement ERP.

In the paper, it is introduced the necessity of course reform, aiming at the current situation of Construction Engineering Economics. It is put forward that course reform should be carried out from strengthening integration between disciplines, improving teaching methods, increasing the content of case teaching and increasing practical training links etc., and through these reform measures to achieve better teaching effect.