In this paper, a kind of high power hydrogen storage alloy powder is studied, its components such as main elements of rare earth and nickel as well as auxiliary elements of Co, Mn, Al and Fe are analyzed by inductively coupled plasma (ICP), its texture is analyzed by X-Ray Diffraction (XRD) test and the platform pressure curve is analyzed by reaction with the hydrogen. Moreover, the high power hydrogen storage electrode alloy is developed by carrying out the tests of particle size and specific surface area for hydrogen storage alloy powder as well as analyzing the electrochemical characteristics of alloy electrode. It is determined to meet the requirements of high power and current for Ni-MH battery by constant power test of battery. The charge-discharge performance with high current of Ni-MH battery is realized by optimizing the preparation technology of cathode.

In the paper, it is introduced the new steel grade 30MnCr25RE is developed for manufacturing L80-1 grade oil casing based on the performance features of hardening and tempering L80-1 grade oil casing manufactured with original steel grade 30MnCr22 by studying the effects of alloy elements in steel. The industrial casual inspection results showed that the minimum yield strength was 570 MPa and maximum yield strength was 625 MPa as well as its fluctuation range was controlled within 55 MPa for L80-1 grade oil casing manufactured with new steel grade 30MnCr25RE. Compared with the original steel grade 30MnCr22, the fluctuation range of yield strength for developed new steel grade is narrower and its performances are more stable. Moreover, the elongation increases by about 4 percentage points comparing with that of L80-1 grade oil casing manufactured with original steel grade 30MnCr22 as well as the impact energy at 0 ℃ could meet the requirements of API spec 5CT technical specification and rigorous technical requirements of users.

In the paper, the technical plan of applying high silicon fluxed limonite in sintering of Baotou Steel is proposed through carrying out the sintering experiment of replacing serpentine with high silicon fluxed limonite aiming at the characteristic of low content of SiO₂ in Bayan Obo iron concentrate, which could provide technical support for optimizing the structures of iron charge and flux as well as greatly reducing production costs of sintering production of Baotou Steel. The experiment results showed that the cost of ore proportioning of sintering reduced, but drum strength of sinter decreased by 1.87 percentage points and burn-up increased by 1.06 kg/t by adding 10.2% high silicon fluxed limonite after washing and re-separation into sintering; the cost of ore proportioning of sintering reduced and there were no obvious changes for quality index of sinter by adding 3.4% high silicon fluxed limonite (raw ore), so it was suggested to adopt high silicon fluxed limonite (raw ore) for adjusting the content of SiO₂ in sinter.

Such problems as abnormal wear of such components as lining plate, uneven product particle size as well as short service life and high manufacturing cost of such components as lining plate, spider cap and head nut caused by uneven burden distribution of distributing device are found during the process of using Sandvik CH-870 crusher in Baoshan Mining Co. so that the frequency of maintenance and operating cost for crusher are high in the early stage of operation. In this paper, the working principle of Sandvik CH-870 crusher is introduced as well as its components such as distributing device, spider cap and head nut are improved combining with the actual situations on site. The operation of equipment is stable, processing capacity of crusher is obviously improved and operating maintenance cost is reduced with the improvement, which provides the references for other enterprises to introduce CH-870 crusher.

As the important energy medium, gas is widely used in each working procedure of metallurgical enterprises, but the inaccurate measurement of mixed gas flow always troubles accurate measurement of enterprise energy. In the paper, it is introduced the composition and general situations of mixed technology for gas of Baotou Steel, elaborated the measurement principle of throttling differential pressure flow meter, analyzed the causes of errors with differential pressure flow meter in the detecting system of mixed gas flow as well as proposed the method for correcting measurement of mixed gas flow under different working and equipment conditions so that the problem of inaccurate measurement of mixed gas is solved.

In the paper, the continuous cooling transformation (CCT) curve of test steel is determined with FORMASTOR-F full automatic phase transformation instrument by taking 38CrMoAl steel as the research object. The results showed that the microstructure at room temperature was proeutectoid ferrite+pearlite when cooling rate was 0.2~ 0.5 ℃/s; the microstructure at room temperature was ferrite+pearlite+bainite and there was a small amount of bainite when cooling rate was 0.5~1 ℃/s; the bainite was formed at the temperature near Bs in the uppermost part of transition zone for bainite and the microstructure at room temperature was upper bainite when cooling rate was 1 ℃/s; the martensite increased continuously and bainite decreased gradually as well as the microstructure at room temperature was mixed microstructure of bainite+martensite when cooling rate was 2~5 ℃/s; the microstructure at room temperature was just martensite when cooling rate was not less than 5 ℃/s, which provide the reference basis for formulating heat treatment process.

In this paper, the design and implementation processes of intelligent quality inspection system for scrap steel are mainly discussed. The system adopts such advanced intelligent technologies as artificial intelligence (AI), big data analysis and video capture to automatically analyze and grade the iron and steel scrap in storage so that such problems as inaccurate identification and unwarrantable objectivity caused by artificial quality inspection are solved. The system can be interconnected with the measurement system, settlement system and warehouse system to automatically generate settlement reports so that work efficiency can be greatly improved as well as safe, accurate and high-efficiency operation of scrap steel inspection is promoted.

The effects of the scratch defect at rail bottom on fatigue life of rail are studied by MTS100T fatigue testing machine. The results showed that the ability of bearing load for rail was declined and its fatigue life was shortened with the transverse scratch defect at rail bottom. The depth of scratch defect at rail bottom obviously influences the fatigue life of rail. With the scratch defect at rail bottom of 75 mm long, if its depth is 0.3 mm, the fatigue life decreases by 27.2% on average, while if its depth is 0.5 mm, the fatigue life decreases by 31.4% on average.

The distribution law of apatite mineral in a tailing of Inner Mongolia is 9.25% and content of P₂O₅ is only 3.73% so that it is low-grade phosphorus mineral. Based on the condition experiment, the open circuit test of primary rougher flotation and secondary concentration is carried out with sodium carbonate as the pH adjusting agent, water glass and HSL as the depressor as well as modified fatty acid TQHY as the collecting agent aiming at the difficult problems of low grade of apatite, many types of gangue mineral containing calcium and similar floatability. Finally, the phosphate concentrate with the grade of P₂O₅ of 33.02% and recovery rate of 78.67% is obtained as well as good separating indexes are obtained.

In this paper, the production practices on reducing unit process energy consumption of 4 150 m³ blast furnace of Baotou Steel are analyzed and summarized. The unit process energy consumption of molten iron in 2021 reduced by 9.26 kgce/t compared with that in 2020 through strengthening the quality management of furnace burden, recovery of waste heat and power, technology-improving of energy saving and energy-saving management as well as reducing power consumption and making full use of secondary energy sources so that better economic benefits are achieved.