In the paper, the factors that affect the temperature drop of molten iron in torpedo car, such as the charge weight of molten iron, the thickness of brick lining for torpedo ladle, the operating time of empty tank and heavy tank that are analyzed through living examples. Measures have been put forward to reduce the temperature drop through which the temperature drop rate of molten iron in torpedo ladle can be effectively controlled proved by practice.

In the paper, it is analyzed the causes for the phenomenon of explosion whistle aiming at four 7 m coke ovens in rare earth steel coking department of Baotou Steel Coking Plant when coal charging, and the main factors causing explosion whistle of coal charging are obtained. According to the coal charging process flow and equipment features of 7 m coke oven, the solving method is put forward, which effectively controls the occurrence of explosion whistle of coal charging.

The internal castable of two high temperature expansion joints in inlet and outlet of CDQ device primary dust collector is seriously eroded and damaged due to the high temperature, air flow, coke powder scouring and other effects, eventually resulting in high temperature deformation of external stainless steel, and causing leakage in the negative pressure area of circulation system, which becomes the weak link that restricts the production of CDQ. The paper analyzes the cause of damage to high temperature expansion joints and carries out the corresponding transformation. Through the production test in the past three years, the feasibility of the transformation has been proved and the experience has been accumulated for prolonging the interval time between the intermediate maintenance and halt production of CDQ device and prolonging the service life.

In 2017 June, the distribution mode in No. 6 blast furnace of Baotou Steel was tried to be optimized for gradually improving the coke platform, reducing the central coke and steadily and reasonably operating the furnace profile. A distribution mode of "platform + funnel" is formed, improving the utilization rate of coal gas, coke ratio and fuel ratio decreased, which provides a reference for the whole adjustment of burden distribution system in blast furnace of Baotou Steel.

In the paper, the operation of blast furnace TRT generator unit when starting and reaching rated speed is in good condition, however the vibration of stator and bearing pedestal seriously exceeds the standard after grid-connected power generation. The vibration reason is analyzed by frequency spectrum, and the processing process is described in detail. The vibration characteristics of stator and rotor after inter-turn short circuit fault, the method of detecting inter-turn short circuit fault and the treatment process of rotor winding inter-turn short circuit fault are summarized.

In the process of converter steelmaking, a great deal of harmful smoke dust will be produced. After the treatment and recycle through the modern environmental protection dust removing equipment, the dust with small particle size and high iron content can be obtained. By adopting some technical measures, the dust ash briquetting which is suitable for converter is successfully developed. The field application of the steelmaking converter shows that the dust ash briquetting has good cooling and slagging effect, which can replace the iron ball, steel slag and iron ore, and realize the full comprehensive utilization of converter dust ash.

In view of the problem on width deviation at head and tail end of steel strip in the 2 250 mm hot rolling production line of Baotou Steel, the methods of optimizing the distribution of heating furnace, adjusting the elevation of pinch roll in inlet of settled breadth machine and strictly controlling the surface temperature difference of heating furnace slab between the upper and lower are adopted, which avoids the problem of steel strip width deviation at head and tail end caused by slip phenomenon of slab at settled breadth machine, and by reasonable distribution of the load between settled breadth machine and vertical roll, the hit rate of steel strip width at head and tail is more effectively improved.

This paper mainly expounds the optimization of H-beam straightening process parameters for No. 2 universal production line in Rail and Beam Plant of Baotou Steel. By modifying the assembled width of straightening roller ring, redesigning the straightening parameters of straightening machine, reducing the straightening pressure and modifying the radius of R angle of straightening roll on the premise of ensuring the flatness to solve the straightening crack defects of H-beam after straightening and improve the quality of products.

In the paper, through the design of transformation and processing program for cutter head of GX coupling threading machine, makes GX coupling threading machine realize the process change from manual deburring to machining deburring. This process change not only improves the production efficiency and reduces the labor intensity of the production staff, but also achieves the purpose of reducing costs and increasing efficiency.

Using the total reused water of Baotou Steel as the supplementary water for blast furnace circulating cooling water, 403 compound water quality stabilizer formula was selected by static sift algorism. The test results show that the 403 compound corrosion and scale inhibitor has excellent corrosion and scale inhibition performance, and it can meet the blast furnace production requirement by adding formula to deal with circulating cooling water from the total reused water of Baotou Steel.

Through the research of carbon dioxide corrosion mechanism, combined with the influence of chemical elements on the microstructure, mechanical properties and corrosion resistance of steel, economical special tubing steel and its components for CO₂ corrosion resistance are designed. Through the CCT curve measurement, hardenability testing, mechanical property testing after heat treatment and detection analysis of carbon dioxide corrosion resistance on test steel, the results show that the hardenability and mechanical properties of the designed steel can meet the design requirements, but there is a certain gap between the corrosion resistance and the design index, and there is optimization space in composition design. On this basis, the steel grade and chemical composition of economical special tubing steel for carbon dioxide corrosion resistant are optimized. It can be seen from the experimental results that the anti-corrosion index of optimized steel grade after quenching and tempering treatment can meet the design requirements.

In order to investigate the effects of different rare earth additions and different heat treatment processes on the properties of rare earth protective steel BT700E, in the laboratory, the pilot test with rare earth alloy adding quantity 5 × 10^-6, 10 × 10^-6 and 15 × 10^-6 are carried out, and different heat treatment systems are matched, and the heat treatment process with 880℃ quenching temperature and 560 ℃, 580 ℃ and 600 ℃ tempering temperature are respectively carried out. The effects of different rare earth additions and different heat treatment systems on the properties of test steels are compared, and results show that the 10 × 10^-6 rare earth addition, 880 ℃ quenching + 580 ℃ tempering in heat treatment process, mechanical properties can meet the requirements of SSAB related technical specifications.

X65 pipeline steel is mainly used in the manufacture of oil and gas pipelines, requiring high strength, high toughness, brittle fracture and good welding performance, but it is easy to appear slab defects in the continuous casting process, which will reduce the comprehensive performance of pipeline steel. In the paper, the high-temperature plasticity of X65 pipeline steel slab is studied. The hot tensile test is carried out by using Gleeble-1500D thermal simulation testing machine, and under the strain rate of 2.0 × 10^-3/s, deformation temperature of 700~1 300 ℃, the fracture strength and the section shrinkage change with temperature are analyzed. The fracture morphology is observed by scanning electron microscope, and the cause of fracture is clarified to provide a theoretical basis for continuous casting production.

The square Q235B plates which are perpendicular to the rolling direction are bent to different degrees by WDW-200 kN universal testing machine, and the relationship between grain size variation, dislocation movement and neutral layer are studied. The results show that microstructure evolves from lath grain into equiaxed grain, and with neutral layer as the boundary, the outer layer thickness is thinner under the action of external tension when the plate is bent, the thickness of the inner layer increasing under pressure, and under the maximum deflection, the increase of r/t specimen is not easy to crack.

Based on the design philosophy of ERP system in Rare Earth Steel Plate plant, giving full play to the advantages of steel GA, GK and GE composition control, successfully achieving the effective combination of steel grade Q235A, Q235B and SS400, after the merger, the three steel grades are designed with one component by using TMCP (thermomechanical control) technology, that is, the rolling and cooling process adjustments, which achieves flexible rolling of Q235A, Q235B and SS400. From the experimental point of view, the feasibility of intensive production technology is verified. By means of flexible rolling technology, the difficulty of smelting is largely simplified, and the fluctuation of steelmaking components is effectively controlled.

In the paper, aiming at the problems existing in the tank floor flaw detection, it is proposed to take nondestructive testing for tank floor by using shear wave probe exciting ultrasonic guided-wave. Ultrasonic guided wave as a new nondestructive testing method, has solved the difficulties in the detection of tank floor defects in China to a great extent. The paper explains the basic concept of guided waves, analyzes the feasibility of nondestructive flaw detection for tank floor by using shear wave probe exciting ultrasonic guided-wave, and determines the parameters and characteristics of using shear wave probe exciting ultrasonic guided-wave. ANSYS is used to make fem simulation of guided wave tank floor defect detection, and the conclusion that SH0 mode guided wave can be excited by using shear wave probe and the defect can be detected are obtained.

19JC digital universal tool microscope is a kind of two-dimensional coordinate measuring instrument widely used in the machining production. However, the tool microscope involves optical and geometrical measurement, the multi parameter and high precision of equipment, which leads to the tedious process, low work efficiency and great accidental error. According to the automatic measuring system of advanced tool microscope both at home and abroad, the existing 19JC digital universal tool-measuring microscope was systematically upgraded and succeeded by using CCD camera technology, digital image processing technology and grating detection technology.

The total amount of rare earth in mixed rare earth chloride solution [RECl₃(L)] is determined by EDTA titration and the effects of glass metering instruments, analytical reagents, sample homogeneity and non-rare earth metal ions on the measurement results are studied. The results show that: Glass metering instruments have the greater impact on the measurement results, especially the error accumulation effect of metering instruments, and errors of total rare earth correction (within the maximum allowable calibration error) can reach 3.66 g/L; the effect of aluminum and iron ions on the measurement results can be eliminated by adding masking agents; the zinc ion concentration is small and the effect on the results can be negligible. In the daily analysis process, pay attention to analyze the quality and correct use of reagents, ensuring the homogeneity of samples, reducing the analysis error, and improve the accuracy of analysis results.

In the paper, according to the situation of low efficiency and unstable system for hot rolled coil pallet conveying system after officially put into use, and from multi-angle analysis in actual field situation, rectification and reform programs are put forward, at the same time achieving good results in actual system transformation, which better meets the needs of fast-paced production in hot rolling.

On the basis of satisfying the profile steel production process in Rail and Beam Plant of Baotou Steel, the existing problems are analyzed and according to the specific performance in actual production, from the palletizing hardware system and control program, replace the encoding disk and motor, optimizing the motor internal contracting brake, resetting the frequency converter and other key equipment, rewriting the palletizing program to meet the variety of rolling requirements, which solve the problem of being necessary to write the corresponding program when rolling a new variety.

Aiming at the AC-AC variable-frequency speed control system of heavy plate mill main drive in Baotou Steel, the calculation method of DC current regulator of SIEMENS AC-AC frequency converter is studied. The calculation method is simple, the calculation of regulator is optimized, the operation performance of system is improved, the safety and stability of production and operation of main drive system are improved, and the application effect is good.

In the paper, a new understanding of the benchmarking management for enterprises is put forward by further digging the root causes of problems in benchmarking management of enterprises, and the value and significance of reducing the cost of production through the implementation of benchmarking management are expounded. Through the perfect combination of benchmarking management, project management and lean management, the reasonable control of sintering production cost is realized.

Based on the analysis of the production status of steelmaking in Baotou Steel and the characteristics of ERP system, the corresponding design of steelmaking operation management system of Baotou Steel is made. According to the process of steelmaking, the system modules are divided from the flow backward station, desulfurization, converter, refining, casting machine and material number maintenance; according to the relationship between the data source and data dropping, the relationship between steelmaking operation management system and other ERP subsystems is designed to ensure the accuracy of data source and data dropping.

Based on the analysis of implementation principles and characteristics of two-dimensional code anti-counterfeiting technology, two-dimensional code anti-counterfeiting system applied to common mobile devices is designed and developed based on the actual needs of different products in the process of product circulation. The system is applied to product anti-counterfeiting, with low cost, high efficiency and can be separated from the cable network to achieve the purpose of anti-counterfeit verification. The system can greatly improve the ability of product anti-counterfeiting, effectively combat the overflow of counterfeit products, and is very important for maintaining Baotou Steel's product image, purifying market order and enhancing product competitiveness.

In the paper, the solution to the contradiction between prominent problems of traditional personnel management in Baotou Steel, such as inconsistent information, the complicated business processes, the low work efficiency, and the growing situation of enterprises is made. Use the current mainstream Java language and MVC design pattern for design. Personnel management is a part of ERP human resource management, and ultimately will achieve the isolation of information from all previous secondary units and asymmetric personnel information are transformed into unified information, staff information updated in time. It is organized by the Organization Department of personnel management, realizing the first level management of the company.

The continuity equation and the Euler equation are the core contents of the momentum transfer. The derivation process has always been the focus and difficulty in teaching and students generally reflect it is difficult to understand in the past. In order to make students better understand and master the derivation process of the continuity equation and Euler equation, in the paper, it is discussed the topic teaching method and deduced the continuity equation and Euler equation of fluid flow, and some understanding and experience in topic teaching method for derivation of the continuity equation and Euler equation are shared, providing the reference for teaching of momentum transfer theory.