In this paper, the microstructure and macrotexture of Hi-B steel at various stages of production are analyzed with such detection means as Zeiss microscope and X-ray diffractometer. The results showed that the microstructure of Hi-B steel was ferrite at all production stages. The microstructure is completely recrystallized after decarbonizing and nitriding annealing and average grain size is 28.92 μm as well as secondary recrystallization is completed after high temperature annealing and average grain size of finished product is about 2 cm. The texture types in sub-surface of hot rolled plate are mainly three types of typical shear textures. The texture of cold rolled plate is mainly composed of α line texture and rotating cube texture {001}<110>, the texture after decarburizing annealing is mainly α^* texture and γ line texture {111}<112> as well as the macrotexture after high temperature annealing is mainly Goss texture. The texture of Hi-B steel after stretching, leveling and annealing is single Goss texture with accurate orientation as well as its strength reaches peak.

In this paper, the differences of microstructure, mechanical properties and resistance to hydrogen sulfide stress corrosion between as-hot-rolled steel pipe and quenched and tempered steel pipe are compared and studied. The study results showed that the microstructure of as-hot-rolled steel pipe consisted of bainite, martensite as well as a small amount of ferrite and pearlite, its tensile strength could meet the requirements of technical agreement, but elongation was close to lower limit of the requirements of technical agreement; the microstructure of quenched and tempered steel pipe was tempered sorbite, strength and toughness and ductility were significantly improved compared with those of as-hot-rolled steel pipe, impact energy at 0 ℃ was over 2.5 times of lower limit for the requirements of technical agreement as well as it is with good resistance to hydrogen sulfide stress corrosion.

In this paper, it is introduced the online accelerated cooling process test of a type of hot rolled C-Mn seamless steel pipe in 460 production line of Baotou Steel Pipe Co., Ltd.. The test results showed that the effects of online accelerated cooling process on microstructure and properties of test steel were significant, generation of proeutectoid ferrite in two phase region could be restrained by online controlled cooling so that the matrix grains were refined as well as grain size was increased from level 6.5 under non controlled cooling conditions to level 8 and the banded structure of steel was improved. The mechanical properties and impact properties of steel pipe are significantly improved, the yield strength could reach 300~345 MPa, tensile strength could reach 485~545 MPa, average value of longitudinal impact energy at room temperature could reach 102 J, average value of longitudinal impact energy at 0 ℃ could reach 86 J and average value of longitudinal impact energy at -20 ℃ could reach 60 J.

In this paper, it is introduced the current situations of such rail standards as AREMA Railway Engineering Maintenance Manual(2020), European Standard EN 13674-1:2011+A1:2017 and China Railway Industry Standard TB/T 2344.1—2020 as well as mainly compared and analyzed the differences of cross section, compositions, properties and test methods for rails satisfied the above three standards. The analysis results showed that the differences of technical requirements for rails satisfied the above three standards were greater due to the level and style of domestic and foreign standards were different. The export level of domestic rails is fully known by comparing these differences, which creates conditions for exporting domestic rails to the international market.

The SS steel grade rail with 60E1 cross section is manufactured with small batch production by comparing the rails with 60E1 and 115RE cross sections, optimizing chemical composition, adopting narrow composition control, increasing C content, controlling contents of Mn and Cr as well as optimizing rolling process. The rail performances could reach R_p0.2≥512 MPa,R_m≥982 MPa,A≥10% and tread hardness (HB) ≥310. The small batch industrial production practices prove that the production process of SS steel grade rail with 60E1 cross section is trouble free and its performances are stable, which could meet the user needs so that it can be produced with incremental quantity.

The effects of riser brick for casting ingot mould used in the smelting equipment of laboratory, vacuum induction furnace on quality of steel ingot are greater. The molten steel in vacuum melting furnace is poured into ingot mould through riser brick and steel ingot is formed after cooling. The flow velocity and angle of the molten steel flowing through riser brick, inclusions in molten steel and inner wall of ingot mould all affect quality of steel ingot. In the paper, the optimization design for structure of riser brick is introduced, which is to add a diversion platform. On the one hand, the scouring force of molten steel to inner wall of ingot mould is reduced so that the service life of ingot mould and surface quality of steel ingot are improved; on the other hand, the retention time of molten steel in riser brick is increased so that the inclusions in molten steel float to be removed and internal quality of steel ingot is improved. The practices prove that the design of riser brick with optimization and transformation is reasonable as well as application effects are good.

In the denitrification process, flue gas needs to be heated due to the temperature requirements of denitration reaction are high, more blast furnace gas is consumed so that a large amount of CO₂ is generated. In order to achieve the energy conservation and carbon reduction, energy saving type built-in direct fired furnace is used instead of traditional heating furnace. The flue gas is heated with the heat released by igniting the CO in flue gas with energy saving type built-in direct fired furnace so that the consumption of blast furnace gas and carbon emission are reduced as well as temperature requirements of denitrification could be met. The consumption of blast furnace gas is reduced by 17.9% with energy saving type built-in direct fired furnace, annual CO₂ emission reduction of over 35 000 t is achieved and annual cost saving could reach over RMB 4 million yuan through applications and comparisons, which could meet the requirements of energy conservation and carbon reduction for steel enterprises on the premise of meeting requirements of denitrification reactions.

The transformations of scientific and technical achievements for colleges and universities play an important role in supporting and promoting the national economic construction and social development as well as the transformations of scientific and technical achievements for colleges and universities in western ethnic minority region are with its own development characteristics. In the paper, the transformations of scientific and technical achievements for metallurgy universities in western ethnic minority region are analyzed from multiple perspectives such as the quantity, amount of money, subject distribution and cycle of achievement transformation based on the data of achievement transformation for a university in western ethnic minority region in 2020-2022, which could provide references for transformations and applications of scientific and technical achievements in western ethnic minority region.

In the article, the solution of unattended weighing system for automatically weighing materials transported by vehicles integrating the measurement and weighing, automation and computer technology is proposed. The system is with such functions as data acquisition, data sharing and remote transmission, voice command, vehicle localization, image capture and video monitoring so that the goal of unattended weighing and intelligent management of materials transported by vehicles is achieved. As a result, various problems such as high labor cost and labor intensity as well as falsification in traditional manual weighing mode are effectively solved.

The proportion of coking fly ash in mixed pulverized coal used in the production with rotary kiln of pellets could reach 15%, production with rotary kiln process is trouble-free and quality of pellets is stable by studying rotary kiln of pellets with coking fly ash. Moreover, the problem of environmental pollution caused by stockpiling of coking fly ash is solved, which provides a new way for effective treatment of coking fly ash. The fuel cost and production cost of pellets are effectively reduced by adding coking fly ash into mixed pulverized coal.