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Source and Control of Nitrogen for X70 Pipeline Steel

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Journal of Iron and Steel Research International 2016年第7期23卷 647-654页

作者： Min WANG yan-ping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The effects of some key factors on nitrogen absorption during the smelting process of X70 pipeline steel were studied,and the source of nitrogen pick-up was analyzed to find the bottleneck for nitrogen control.A series of measures were put forward to decrease the nitrogen *** results indicated that an exponential relationship existed between the nitrogen absorption index and the free oxygen in molten *** absorption index could decrease below 0.3when free oxygen in molten steel was above 100×10^（-6） after *** low sulfur killed steel,the nitrogen absorption ratio and sulfur content satisfied a linear relationship with a slope *** free-oxygen and sulfur were beneficial to the deep desulfurization during vacuum *** contradiction of high desulfurization ratio and low nitrogen pick-up during LF process could be resolved by skimming oxidizing slag after tapping and making new high basicity top *** optimization,the average content of nitrogen in final product decreased from 46×10（-6）to 35×10（-6）.

关键词： nitrogen control nitrogen absorption surface activity element X70 pipeline steel

Mn evaporation and denitrification behaviors of molten Mn steel in the vacuum refining with slag process

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1288-1297页

作者： Jian-hua Chu yan-ping bao State Key Lab of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Considering the precise composition control on the vacuum refining of high-Mn steel, the behaviors of both Mn evaporation and nitrogen removal from molten Mn steel were investigated via vacuum slag refining in a vacuum induction furnace. It was found that the reaction interfaces of denitrification and Mn evaporation tend to migrate from the surface of slag layer to the surface of molten steel with the gradual exposure of molten steel during the vacuum slag refining process. Significantly, compared with the experimental group without slag addition, the addition of slag into steel can result in a lower Mn evaporation rate constant of 0.0192 cm·min~(-1) at 370 Pa, while the denitrification rate is almost not affected. Besides, the slag has a stronger inhibitory effect on Mn evaporation than the reduced vacuum pressure. Moreover, the inhibitory effect of the slag layer on Mn evaporation can be weakened with the increase of the initial Mn content in molten steel. The slag layer can work as an inhibitory layer to reduce the Mn evaporation from molten steel, the evaporation reaction of Mn mainly proceeds on the surface of the molten steel. This may be attributed to the Mn mass transfer coefficient for one of reaction at steel/slag interface, mass transfer in molten slag, and evaporation reaction at slag/gas interface is lower than that of evaporation reaction at steel/gas interface. The introduction of slag is proposed for both denitrification and manganese control during the vacuum refining process of Mn steels.

关键词： manganese evaporation denitrification vacuum slag evaporation rate

Editorial for special issue on metallurgical process engineering and intelligent manufacturing

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1249-1252页

作者： An-jun Xu yan-ping bao School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In recent years, new concepts and new technologies for improving the manufacturing level have emerged one after another, and the global industrial competition pattern will undergo major adjustments. The United States proposed the"Advanced Manufacturing Country" strategy, France proposed the "New Industry France Plan," and Germany proposed "Industry 4.0." At the same time.

关键词： intelligent pattern emerged

A method for observing the three-dimensional morphologies of inclusions in steel

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International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 111-115页

作者： yan-ping bao Min Wang Wei Jiang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China Journals Publishing Center University of Science and Technology Beijing Beijing 100083 China

A method for observing the three-dimensional morphologies of inclusions by deeply eroding a steel sample with a kind of organic solution composed of bromine water, acetone, and HCl （volume ratio, 45：45：10） was introduced. Four different kinds of inclusions in ultra low carbon steel were compared by metallographic observation and erosion observation. The results show that the three-dimensional morphologies of different kinds of inclusions could be observed clearly and simply after erosion. The method is useful for the observation and analysis of inclusions made by deep erosion. It also provides a new way to control and remove inclusions based on the true morphologies of inclusions.

关键词： inclusions morphology erosion ultra low carbon steel

Cleanliness of Ti-bearing Al-killed ultra-low-carbon steel during different heating processes

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1370-1378页

作者： Jian-long Guo yan-ping bao Min Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the production of Ti-bearing Al-killed ultra-low-carbon(ULC) steel, two different heating processes were used when the converter tapping temperature or the molten steel temperature in the Ruhrstahl–Heraeus(RH) process was low: heating by Al addition during the RH decarburization process and final deoxidation at the end of the RH decarburization process(process-Ⅰ), and increasing the oxygen content at the end of RH decarburization, heating and final deoxidation by one-time Al addition(process-Ⅱ). Temperature increases of 10°C by different processes were studied; the results showed that the two heating processes could achieve the same heating effect. The T.[O] content in the slab and the refining process was better controlled by process-Ⅰ than by process-Ⅱ. Statistical analysis of inclusions showed that the numbers of inclusions in the slab obtained by process-Ⅰ were substantially less than those in the slab obtained by process-Ⅱ. For process-Ⅰ, the Al_2O_3 inclusions produced by Al added to induce heating were substantially removed at the end of decarburization. The amounts of inclusions were substantially greater for process-Ⅱ than for process-Ⅰ at different refining stages because of the higher dissolved oxygen concentration in process-Ⅱ. Industrial test results showed that process-Ⅰ was more beneficial for improving the cleanliness of molten steel.

关键词： low carbon steel cleanliness RH process heating inclusions

Simulation study on factors influencing the entrainment behavior of liquid steel as bubbles pass through the steel/slag interface

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 511-519页

作者： Xiang Li yan-ping bao Min Wang Lu Lin State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

In this study, a water/silicone oil interface was used to simulate the steel/slag interface in a converter. A high-speed camera was used to record the entrainment process of droplets when air bubbles were passed through the water/silicone oil interface. Motion parameters of the bubbles and droplets were obtained using particle kinematic analysis software, and the entrainment rate of the droplets was calculated. It was found that the entrainment rate decreased from 29.5% to 0 when the viscosity of the silicone oil was increased from 60 mPa.s to 820 mPa.s in the case of bubbles with a 5 mm equivalent diameter passing through the water/silicone oil interface. The results indicate that in- creasing the viscosity of the silicone oil is conducive to reducing the entrainment rate. The entrainment rate increased from 0 to 136.3% in the case of silicone oil with a viscosity of 60 mPa.s when the equivalent diameter of the bubbles was increased from 3 mm to 7 ram. We there- fore conclude that small bubbles are also conductive to reducing the entrainment rate. The force analysis results for the water colmnn indicate that the entrainment rate of droplets is affected by the velocity of the bubble passing through the water/silicone oil interface and that the en- trainment rate decreases with the bubble velocity.

关键词： steelmaking bubbles interfaces entrainment influencing factors simulation studies

Comparison between the surface defects caused by Al_2O_3 and TiN inclusions in interstitial-free steel auto sheets

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 178-185页

作者： Rui Wang yan-ping bao Zhi-jie yan Da-zhao Li yan Kang School of Materials Science and Engineering North University of China State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Al_2O_3 and TiN inclusions in interstitial-free(IF) steel deteriorate the properties of the steel. To decrease the defects of cold-rolled sheet, it is important to clearly distinguish between the degrees of damage caused by these two inclusions on the surface quality of the steel. In this study, a nanoindenter was used to test the mechanical properties of the inclusions, and the distribution and size of the inclusions were obtained by scanning electron microscopy(SEM). It was found that when only mechanical properties are considered, TiN inclusions are more likely to cause defects than Al_2O_3 inclusions of the same size during the rolling process. However, Al_2O_3 inclusions are generally more inclined to cause defects in the rolling process than TiN inclusions because of their distribution characteristic in the thickness direction. The precipitation of Al_2O_3 and TiN was obtained through thermodynamical calculations. The growth laws of inclusions at different cooling rates were calculated by solidification and segregation models. The results show that the precipitation regularity is closely related to the distribution law of the inclusions in IF slabs along the thickness direction.

关键词： interstitial-free steel inclusions nanoindenter inclusion precipitation

Optimization of large capacity six-strand tundish with flow channel for adapting situation of fewer strands casting

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Journal of Iron and Steel Research International 2021年第9期28卷 1114-1124页

作者： Cheng Yao Min Wang Ming-xu Pan yan-ping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China Daye Special Steel Co. Ltd.Huangshi435000HubeiChina

Closing a single nozzle or multiple nozzles for a temporary casting operation(fewer strands casting)was common in a tundish due to insufficient molten steel or equipment ***,nozzle clogging usually happens under the situation of fewer strands ***,a temperature deviation index was introduced to characterize the temperature stratification of molten steel for a large capacity tundish,and a new calculation method of residence time curve was used to describe the different flow types of molten steel at each *** on hydraulics experiment and numerical simulation,important parameters of present case and modified case were *** the situation of fewer strands casting,the proportion of internal-recycle flow after modification decreased from 30.68%to 24.55%;the standard deviation of the response time reduced from 27.59 to 13.16,and the interquartile range of temperature deviation index changed from 0.89 to 0.27.

关键词： Large capacity tundish Fewer strands casting Internal-recycle flow Strands consistency Temperature deviation index

Mathematical model of deoxidization with post stirring in a combined blowing converter

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 541-545页

作者： Jie Feng yan-ping bao Xun Wu Heng Cui Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Heibei University of Science and Technology Shijiazhuang 050035 China

Dissolved oxygen in the steel at the terminal of the converter smelting process is the main cause for the formation of oxide inclusions, and the high terminal oxygen content worsens the steel cleanness. However, post stirring in a combined blowing converter can promote the carbon-oxygen reaction in the liquid steel and reduce the dissolved oxygen content at the terminal of the converter smelting process. Thus, the mathematical model of deoxidization in the post stirring process was obtained, and the rationality of which was further verified by industrial tests. Finally, it is concluded that the product of dissolved carbon and oxygen, i.e. w[C]·w[O], decreases obviously after adopting the new technique of post stirring in the combined blowing converter.

关键词： steelmaking converter deoxidization mathematical model