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.