In order to solve the difficult problem for long distance transmission of large scale hydrogen energy with low costs, the X52M hot rolled steel strip for pipeline added with hydrogen is designed, researched and developed as well as its engineering applications are realized. It is with the design of low C and Mn, Nb and Ti alloying, extreme low contents control of P and S as well as smelting with high cleanliness and reasonable controlled rolling and cooling process. It is with excellent comprehensive performances, good low temperature toughness and resistance to hydrogen brittleness. Its dimensional precision is high and surface quality is good so that the properties of pipe body and weld seam could meet the requirements and satisfy the operating requirements of steel pipe. It is applied in the Baotou-Linhe gas pipeline for western natural gas so that the first pipeline engineering application of spiral submerged arc welded pipe added with hydrogen is realized.

The small-diameter boiler tube is designed and developed through innovating process design as well as its quality indexes are improved by Inner Mongolia Baotou Steel Special Steel Pipe Co., Ltd. based on the requirements of group company, “break through and improve product quality”. The seamless steel pipe with outer diameter of 51~114.3 mm and wall thickness of 3.5~12 mm is rolled by continuous casting billet of Φ150 mm in the original design of the unit. The demand of small-diameter boiler tube with outer diameter of 38~48 mm and wall thickness of 3.5~8 mm in the boiler tube industry is greater. The seamless steel pipes of two groups of outer diameter produced with the billets of the same diameter is realized and their wall thickness accuracy is -7.14%~9.14% through researching and developing the technology of large tube reducing rate for continuous mill unit as well as producing the seamless steel pipe with outer diameter of 38~48 mm by continuous casting billet of Φ150 mm. When rolling small-diameter boiler tubes made of materials of 25MnG, 15CrMoG and 12Cr1MoVG, there are defects of “straight fold” on inner surface as well as “linear indentation” and “subsurface cracks” on outer surface of steel tube. Their causes are analyzed combining with the deformation process and material characteristics as well as the solutions are formulated so that qualified rate of ultrasonic flaw detection of product is increased from 86.82% to 91.32%. The heat-treatment schedule for small-diameter boiler tubes made of materials of 15CrMoG and 12Cr1MoVG is formulated as well as the mechanical properties of products are stable under this process schedule, which could meet the requirements of GB/T 5310-2017 standard.

The analysis of chemical components for galvanized plate matrix as well as detection of plating thickness and weight could be completed simultaneously with the glow discharge optical emission spectrometry. The optimal determination conditions are selected and lower limits of determination for each analytical element are determined by comparing and analyzing the results with different electrode sizes, discharge conditions, measured pressure and power; the analytical method for determining matrix composition, plating thickness and weight of galvanized plate is established through comparison of analytical methods as well as precision and accuracy tests.

The armco iron is low carbon steel with such characteristics as soft texture, high toughness and good ductility. The cracks, bending and defects of appearance are easy to occur when rolling flat steel of electrode with armco iron as raw material. Such product defects as dimensional accuracy and cracks for flat steel of electrode are effectively controlled by such measures as improving heating system, optimizing pass and rolling route so that the stable production of products with armco iron is realized.

The optimum pickling process parameters are studied through analyzing the effects of pickling process before phosphating on the quality of phosphating film and phosphating time on the premise of without changing process route aiming at the problems of discontinuous phosphating film and poor adhesive force on the surface of 25CrMo44 alloy steel. The optimum pickling process parameters are that the concentration of pickling solution is 90~110 points, pickling temperature is 40~60 ℃ and pickling time is 10~16 min., the phosphating film generated under this condition is compact, uniform and continuous as well as the adhesive force is qualified.

In this paper, the causes of defect of longitudinal crack on surface of Q420NQR1 continuous casting billet and rolled products with hypo-peritectic steel are analyzed as well as the control measures are put forward. The results indicated that the defect of longitudinal cracks for rolled products originated from longitudinal cracks on surface of casting blank, most of which were on the web of beam blank away from submerged entry nozzle. The inner flow field of crystallizer is studied by physical simulation. It is found that there is single circulation flow on the web of crystallizer, which directly causes the melt cinder layer of casting powder away from submerged entry nozzle to be thinner so that effective heat control is difficult to be realized at this position. The flow velocity of surface layer of liquid steel could be reduced and even distribution of melt cinder could be promoted through appropriately increasing the insertion depth of submerged entry nozzle; the quality of casting blank and rolled products could be improved combining with the uneven burden distribution mode of casting powder so that the longitudinal crack rates of casting blank and rolled products are reduced by 30% and 34% respectively.

In this paper, it is introduced the working principle and technical parameters of regenerative heating furnace in 1^# production line of Long Products Plant, analyzed the characteristics of heat input and output of regenerative heating furnace and ordinary heating furnace, obtained heat balance table and heat efficiency by calculation as well as analyzed the factors affecting heat input and output. Such measures as improving temperature of hot charging and hot delivery of billet and hot charging rate, decreasing temperature of billet out of furnace, using optimal air fuel ratio, reasonably setting commutation cycle, strengthening heat exchange effect in furnace, improving heat exchange efficiency and strictly controlling furnace pressure of regenerative heating furnace are proposed, which are with guiding significances for energy saving and consumption reducing of regenerative heating furnace.

In the traditional quality optimization process of stamping parts, the optimization is mainly through mold adjustment so that the time and quality costs are both higher. With the early vendor involvement (EVI) of professional quality management, the computer aided engineering (CAE) analysis technology is gradually applied in the simulation of stamping automobile parts. In the paper, it is introduced the self-owned material card of Baotou Steel is successfully developed by correctly selecting such characteristic parameters as typical representative performances and yield criterion through taking the DX53D+Z product as an example as well as the research on reliability of material card is completed by the analysis on forming property of products in the Autoform software. It is verified that the self-owned material card of Baotou Steel is with higher reliability and the database of simulation material could provide data support for EVI service.

With the rapid development of society, the requirements of market for quality and performance of steel products are constantly increasing. The competition in the steel industry is increasingly fierce. The stable product quality is an effective way to improve market competitiveness on the basis of ensuring supply on time. In the paper, it is introduced such problems as unstable product quality and high costs are solved as well as the reform and exploration of quality management on new models of professional user-centered quality management and contract-centered steel rolling management are carried out for Baotou Steel Union Co., Ltd. in order to improve the market competitiveness of products. As a result, the stability of product quality and production efficiency are increased so that good economic benefits are created.

In this paper, it is briefly introduced the research and development and production processes of rare earth rails, summarized researches of rare earth rails in different periods as well as mainly introduced the technical specifications and industrial production of U76CrREH rail in TB/T 2344.1—2020 standard. U76CrREH rail is the rail with independent design, research and development and production of Baotou Steel as well as with the highest strength grade in China’s railways. The rare earth is mainly used to purify molten steel and refine microstructure in order to achieve the effect of improving fatigue life during service of rails. The industrial production requires narrow composition range as well as adopts such control technologies as low H and O to ensure internal metallurgical quality of rail; its tensile strength ≥1 280 MPa, tread hardness (HB)≥370, microstructure is pearlite and surface quality could meet the technical requirements of standard through adopting such technologies as rolling and cooling technologies of online heat treatment. The rail is applied on small radius curves in Urumqi and has been in service for over three months. The accumulated total through-put weight reaches 30 Mt as well as surface condition and wear of the rail are normal with side wear of 0~0.13 mm.