In the important period of country to promote supply-side structural reform and steel industry to achieve transformation and upgrading, combined with the current situation of China's iron and steel industry, the difficulties and opportunities are analyzed, and the way out for the development of China's iron and steel industry under the new situation of economic development is discussed. It is pointed out that innovation drives the transformation and development of iron and steel industry, and adjusting the structure and realizing the green manufacturing of iron and steel industry are imperative.

The work of dry dedusting instead of wet dedusting for No. 1 and No. 2 converter in CSP Plant of Baotou Steel has been completed in 2006. In view of the problems existed in equipment of 210t converter dry dedusting system, such as failure, failure of multiple parts and the low efficiency of equipment operation and so on, after a long period of exploration, measures to reduce the equipment failure and equipment operation rules have been found out, and some equipment have been effectively improved and transformed to reduce the equipment accident time and improve the efficiency of dust collector.

In the paper, usage amount ratio of desulfurizer and stirring time of desulfurization are studied in the process of KR desulfurization for pretreatment of hot metal, and on the basis of reducing 30% desulfurizer addition amount in the original design, while extending the stirring time 3~6 min, which can improve the utilization of desulfurizer, achieve desulfurization with low cost, thereby reducing the cost of raw material consumption.

In the paper, it is introduced the use scheme of self-produced saturated steam from 210 t converter in Sheet Plant of Baotou Steel and the steam is used for RH vacuum pumping, EC spray gun of dry dedusting, deaerator water tank heating and damp down of opening for oxygen core lance and so on, and the corresponding measures are adopted to reduce the steam release rate of converter, reduce the waste of energy and the consumption of external superheated steam, realize the gradient utilization of energy and save energy and reduce consumption, achieving obvious economic benefits.

Through the analysis of w (FeO) change in top slag of silicon steel, it is concluded that the converter tapping of silicon steel is not completely deoxidized, which leads to the transmission of oxygen from steel to slag, and it is the main reason for poor effect in top slag modification of steel ladle in converter process. Through two-step top slag modification, the one is top slag modification of steel ladle in converter process, the other one is top slag modification of steel ladle in RH process, and taking the technical measure of alloying of manganese before RH decarburization, the w (FeO) in RH top slag of steel ladle for ultra-low carbon steel can be reduced to less than 5%, and the w (MnO) shall be controlled at about 4%, and the w [O] _T in tundish molten steel shall be controlled below 20 × 10^-6, through which the cleanliness of ultra-low carbon steel will be remarkably improved.

The relationship between denitrification rate of molten steel and initial w [N] and vacuum degree cycle number and thickness of slag layer is analyzed through denitrification process of 210 t RH refining furnace in Sheet Plant of Baotou Steel. Test results show that: The denitrification rate under vacuum is controlled by many process factors; the influence of initial w [N] on denitrification rate exhibits ladder characteristics; low vacuum is a necessary condition for obtaining higher denitrification rate; the effect of denitrification is the best when cycle number keeps within 10~12 times; the thickness of slag layer has double influence on denitrification, and the slag quantity should be controlled reasonably so that the thickness of slag layer can be avoided from 130 to 150 mm interval.

In the paper, it is introduced and analyzed the effects of main alloying elements, impurity elements and special elements on magnetic properties for cold rolled non-oriented electrical steel of low carbon and low silicon, and the mechanism of action for these elements effects on magnetic properties. The results show: Si, Al, Mn and other major alloying elements are the main determinants of magnetic properties, with their contents increasing, iron loss increasing, the magnetic susceptibility values decreasing; C, N, O, S, Ti and other impurities are not conducive to magnetic properties; after the addition of Sn, RE and other special elements, the composition of favorable texture can be increased obviously, and the magnetic properties can be optimized.

In the paper, the cause of longitudinal crack in the production of SS400Ti from CSP thin slab caster is analyzed, and through the electron microscopic scanning analysis of crack source, the real cause of longitudinal crack is degeneration of mould fluxes. Combined with production practice of CSP production line for many years, the control and solving path of longitudinal crack of SS400Ti production line in CSP production line are summarized. Provide help to reduce the longitudinal crack defects and improve the qualified rate of hot-rolled products.

Aiming at problems existing in the ultra-fast cooling system of CSP production line in Sheet Plant of Baotou Steel, the problems are transformed and optimized. Based on technical advantages of ADCOS-HSM (Advanced Cooling System-Hot Strip Mill) after being transformed, the quality problems in production of dual phase steel in hot rolling are solved through research and application of dual phase steel production process, microscopic structure and mechanical property.

355QK, 460QK are steel plates produced in wide plate production line of Baotou Steel and used in automotive axle housing for some large enterprise, and they are used in the rear axle of loading truck. Based on the study of color difference on the surface of axle housing steel plate, the pressure fluctuation in descaling process is analyzed by means of quality tools. The reasons causing color difference on the surface of axle housing steel plate are found, and improvement measures are put forward, having achieved a good effect.

The shape of strip steel, as an important quality index of plate and strip, has been highly concerned by users. In the paper, it is briefly introduced the process characteristics of CSP production line in Baotou Steel, combined with on-site production characteristics, and factors affecting the shape of strip steel are analyzed from the impact of roll gap shape as the main entry point. In addition, other factors affecting the final shape of strip steel are added. Finally, according to the cause analysis, measures conforming to the site requirements are worked out, and the shape control is improved obviously.

In view of the high fuel consumption for heating furnace in heavy plate production line of Baotou Steel, in the paper it is mainly analyzed six factors that affect the fuel consumption of heating furnace, including production efficiency, combustion efficiency, waste gas heat loss, furnace surface heat loss, slab heat recovery and slab discharge temperature. The fuel consumption of heating furnace is greatly reduced through seven rectification measures, such as reducing heating capacity, enhancing heat preservation, improving air gas mixing way, increasing slab charging temperature, decreasing slab discharge temperature, optimizing the cooling system for slab to be rolled and stabilizing furnace pressure.

In view of supercooling problem of steel plate head in Baotou Steel heavy plate production line, the longitudinal temperature difference of steel plate after cooling is reduced from 40 ℃ to 20 ℃ through optimizing roller speed to improve the tracking accuracy, reducing the temperature difference of steel plate before cooling, improving flow control accuracy, optimizing head masking parameter in cooling model. The supercooling problem of steel plate head after cooling has been solved, and the first pass yield of steel plate has increased by 2.09%.

Adhesion defect is a common surface quality defect in cold-rolled coil. Slight adhesion will affect the appearance quality, and severe adhesion will cause strip steel cannot be used. In the paper, it is primarily analyzed the characteristics causing adhesion defects, then reasons for the occurrence of adhesion are judged through the probability of adhesion defects occurrence by comparing different coiling tension and annealing process. According to the actual product situation, summing up the way to eliminate the defect in cold-rolled coil surface.

The open flame burner used in galvanizing furnace is now exposed to many defects as it is used for a long time. Since the production of building production line, there has been many times of brick falling in the NOF furnace, which seriously damaged the equipment in the furnace, and produced a lot of defects at the same time, which will lead to the strip breakage accident. Through reinforcing the connection between brick body and cover plate, changing the support method for supporting brick and optimizing refractory material layout, effectively reduce and control the occurrence of brick fall accident in annealing furnace.

After the exploration and summary of the production process of 200, 000 tons silicon steel in Sheet Plant of Baotou Steel, factors such as the quality of steel plate cleaning, the annealing temperature of annealing furnace and the thickness of coating film are the key factors affecting the performance of silicon steel finished products. The cleaning quality of the cleaning section before optimization is an effective method to reduce the probability of furnace accretion for furnace roller. The annealing temperature of the annealing furnace at 750~950℃ is the core technology to refine the grain of steel plate, adjust the microstructure and eliminate the defects of microstructure. Uniform coating film, reasonable thickness and guaranteed in 3.2~3.5g/m² are important measures to ensure the corrosion of silicon steel sheet from various corrosive mediums.

BY500 high strength wear-resisting plate is widely used in mining, power and other industries, and the main problem at present is the thin gauge plate after quenching with poor plate shape. Through reasonable composition design and reasonable control of quenching water quantity, roller speed, quenching water pressure and other parameters, the steel plate performance and plate shape can meet customer requirements.

Water damage of asphalt pavement is a common problem in highway engineering. In the paper, the mechanism of water damage formation and the causes of water damage of asphalt pavement are analyzed, and six concrete measures to prevent water damage of asphalt pavement are put forward in order to reduce the occurrence of asphalt pavement water damage and prolong the service life of pavement.

In the paper, it is studied the microstructure and texture evolution of CSP non-oriented electrical steel 50W600 in hot rolling, cold rolling and annealing process. The results show that: The casting blank is columnar grain structure; the texture of hot rolled plate along the thickness is uneven, and the main texture of surface is brass texture; the decarburizing plate is recrystallization texture and the average grain size is 50 μm, which mainly is γ fiber texture.

In the paper, the working principle and steps of strip steel strapping machine are introduced. Aiming at problems in the process of bundling, such as banding strap loosing, distributor scroll difficult, drive shaft easy to break and reducer tooth break; using mechanical principle and combining with the actual situation on site, the design and analysis of the related problems are carried out, and the corresponding modification scheme is put forward, while the feasibility of the scheme is proved and the modification is carried out. By comparing the use effect and cost accounting before and after the modification, equipment failure is reduced.

Based on the analysis of structure and working principle of drum type flying shear, in the paper it is introduced the application and structural features of drum type flying shear in galvanizing line of Baotou Steel. It is expounded and summarized the different shear edge forms of cold rolling drum type flying shear, and combined with on-site practical experience, technical points in mechanics for flying shear maintenance are emphatically introduced. The experience has been well applied in galvanizing line of Baotou Steel, and maintenance time of flying shear is shortened; normal and steady operation of drum type flying shear is ensured; service life of flying shear of the roller is improved, having a great economic benefit and the method is practicable. It has played a certain reference for the maintenance work of such kind of flying shear.

The automatic calibration technology of rolling mill in CSP production line is the technical focus and difficulty of CSP steel rolling, and the calibration failure is the key factor that restricts the stable operation of production line in practical production. Based on experience accumulated in the operation of Baotou Steel CSP production line for many years, the process and principle of automatic calibration are analyzed in detail, which provides a technical reference for studying calibration technology and processing calibrating faults in production line.

In the project of dust removal by ventilation, air dilution cooling is widely used as a common cooling method. Through analysis of the case, it is roughly discussed the application and energy saving optimization function of air dilution cooling technology in dedusting for metallurgy, namely, the baghouse system.

Some of the sludge and debris will flow with the water from water pump inlet into system when suction well of industrial circulating water system is in normal operation, resulting in pipeline filter clogging and production line nozzle clogging. In the paper, it is analyzed reasons for the entry of sludge into suction well and introduced the method of adding fender weir, and the concrete method and application example of installing fender weir in suction well. Practice has proved that the fender weir can effectively prevent sludge from inhalation into water supply system.

In order to reduce energy consumption, easy to maintain equipment, in view of problems of large energy consumption in DC4 pump set of CSP laminar flow turbid circulating water system in Sheet Plant of Baotou Steel, a new type of submersible pump is selected according to working conditions of field equipment. The reasonable transformation plan is developed to achieve the purpose of saving energy consumption, and also provides a reference method for other similar enterprises energy saving transformation.

In order to make rotary shaft in a benign operation, delay its degradation speed and prolong its usage period, in the paper, through research on the online operation trend of large pivotal bearing in heavy plate steel ladle, damaged large pivotal bearing off the assembly line is disintegrated for research and study, and the main factors affecting the damage of large pivotal bearing are analyzed. Combined with a variety of uncertain parameters in actual production of large pivotal bearings, measures for comprehensive maintenance, installation and use are taken to delay equipment degradation speed, prolong its service life, effectively improve the casting machine production continuity of heavy plate and improve the operation rate of equipment.

Three kinds of reasons for mill scale accumulation are found by analyzing the phenomenon that mil scale is often occurred in vibrating screen of straightening machine. According to years of work experience, the corresponding measures have been taken, that is, two link stopper are welded on the outer side of lower roll box, so that the vibrating screen can be quickly cleaned online. In addition, the original design vibrating screen is horizontal. In order to make the mill scale slip out of the chute rapidly, the exit of vibrating screen is lowered by 20 mm. It is not only to prolong the mill scale cleaning cycle, but also reduce the downtime and improve the equipment operation rate. And after the transformation, effect is obvious.

In 2016, the conference for the work of national state-owned enterprises party building, General Secretary Xi Jinping proposed to strengthen and improve the party's leadership of state-owned enterprises, strengthen and improve the party building of state-owned enterprises, and making state-owned enterprises become the party and the country's most reliable power. The paper focuses on discussion for ways and means to strengthen the party building work of state-owned enterprises in the face of many problems in party building work of state-owned enterprises, and make the party construction work as a powerful push to promote the deepening reform of state-owned enterprises and improve the management level.