The influences of cold rolling reduction ratio and annealing time on the stamping performance of Ti-IF deep drawing steel are studied by means of such equipment as optical microscope, X-ray diffractometer and tensile tester aiming at the phenomenon that the stamping performance of cold rolled cover annealing thick deep drawing steel is unstable. The results showed that the r value and tensile strength tended to increase and change of n value was not obvious with the increase of cold rolled reduction ratio; r value increased, tensile strength decreased and change of n value was not obvious with the extension of annealing time. The process is optimized according to the test results so that density of {111} texture is enhanced and stamping performance of product is obviously improved.

As one of the important hot tools in perforated rolling process of seamless steel tube, the quality of guide plate directly affects quality and cost of steel tube. In this paper, the effects of modification of rare earth and heat treatment on carbide shape in high chromium nickel alloy guide plate are studied aiming at the problem of its fragmentation during use. Moreover, the microstructure of net carbide in high chromium nickel guide plate is fragmentated and broken, matrix structure is refined and carbide uniformly distributes by selecting reasonable process so that the purpose of improving service life of guide plate is achieved.

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.

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.

Three-dimensional mathematical model is established with commercial software aiming at the tundish of slab caster to calculate flow field in tundish with different flow control device conditions of tundish as well as analyze the effects of different schemes on flow condition of molten steel and average retention time and the situations of inclusions in steel with adopting the optimization scheme. The results showed that the volume of dead zone for tundish reduced by 10.61% and the time that tracer appeared in tundish extended by 4.31% comparing the optimization scheme with original scheme, which are all beneficial to mixing molten steel in tundish as well as floating and removal of inclusions. Moreover, the level of inclusions in steel adopting optimization scheme could satisfy the requirements of production technology.

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.

The ferric charge for tailings after carbonization reaction of steel slag is with magnetic separation, then the feasibility study of returning to sintering for concentrate powder and tail powder of magnetic separation is carried out. Their chemical components are analyzed and the effects of adding them into sintering process on content of P for molten iron of blast furnace are calculated. The effects of concentrate powder of magnetic separation on the sintering components and indexes are analyzed through its sinter pot test. Finally, it is proved that the concentrate powder of magnetic separation can return to sintering process to be used.

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.

With the growth in the people’s living standard, the demand of resources is more and more, which leads to continuous exploitation of a large number of mineral resources in our country so that there are many ecological problems. In this paper, the ecological impacts of strip mining in desert steppe are analyzed from such aspects as plant and animal resources, land resources as well as landscape through field investigation in project area by taking the strip mining project in Dongkekeyiligeng mining area of Darhan Muminggan Liahheqi in Inner Mongolia as an example. Moreover, the suggestions on ecological conservation measures of strip mining are put forward based on the theory of restoration ecology.

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.