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Discussion on the Free Quenching Heat Treatment Process of Automotive Leaf Springs

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第1期2卷 9-11页

作者： Xianfeng Xu Xinjiang baosteel Metal Products co. Ltd.

Free quenching of automotive leaf springs is a new technology that has gradually started to be applied in the industry in China in recent *** a few manufacturers are applying it in the *** more than half a year of on-site practice,the changes in the hot forming of spring plates before free quenching have been explored,and finally a heat treatment process that meets the production requirements of our co.pany has been developed,achieving normal production.

关键词： automotive leaf springs free quenching heat treatment technology

Effect of co.ling method on TiN precipitation behavior of high-titanium high-strength steel during solidification

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Journal of Iron and Steel Research International 2024年第7期31卷 1692-1703页

作者： Xue-jian Zhang Guang-wei Yang Yong Wan Yong-hong Wen Chuan-sheng Tang Ming-qi Liu Li-jie Tian Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Anhui University of TechnologyMa'anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina baosteel Central Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

Metallographic microsco.y,scanning electron microsco.y and TiN growth thermodynamic and kinetic equations were used to investigate the morphology,quantity,and size of TiN in the center of high-titanium high-strength steels under different solidification co.ling *** results showed that TiN in the center of the experimental steels mainly existed in three forms:single,co.posite(Al2O3-TiN),and multi-particle *** began precipitating at around 1497℃(solidification fraction of 0.74).From the end of melting to solidification for 180 s,the co.ling rates in the center of the experimental steels for furnace co.ling,air co.ling,refractory mold co.ling,and cast iron mold co.ling tended to stabilize at 0.17,0.93,1.65,and 2.15℃/s,*** size of TiN in the center of the experimental steel co.led using furnace co.ling was mainly co.centrated in the 5-15 pm *** co.trast,the size of TiN in the center of the experimental steels co.led using air co.ling,refractory mold co.ling,and cast iron mold co.ling were mainly co.centrated in the 1-5 pm *** addition,their density of TiN in the center of the experimental steels is signif-icantly higher than that of the furnace-co.led experimental *** and kinetic precipitation models of TiN established predicted the growth size of TiN in a high-titanium high-strength steel when the solidification co.ling rates are not below 0.93℃/s.

关键词： High-titanium steel co.ling method TiN Thermodynamics Kinetics

Investigation and improvement of tiny spot defects on hot-dip galvanized automotive steel sheets

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baosteel Technical Research 2024年第2期18卷 32-38页

作者： GE Zhiyong YANG Bo YANG Jiwu baosteel Zhanjiang Iron&Steel co. Ltd.Zhanjiang 524072GuandongChina

The causes of tiny spot defects on the surface of hot-dip galvanized automotive steel sheets were studied using scanning electron microsco.y(SEM)and energy dispersive spectrometer(EDS),and effective co.trol measures were *** results show that rubbing against the top roller after galvanizing is easy due to the local thickness of tiny spot defect location co.ting;therefore,the surface morphology is different from the normal *** kinds of defects,namely zinc slag,small slivers,and pitting,are likely to cause local thickening of the co.ting after galvanizing,leading to the formation of tiny ***,resolving the three types of defects can effectively co.trol the generation of tiny spot *** them,due to the hereditary nature of the small sliver defect,focusing on its co.trol and supervision is necessary.

关键词： hot-dip galvanizing tiny spot zinc slag pitting small sliver

Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 999-1006页

作者： Sen Wang Hucheng Pan Caixia Jiang Zhihao Zeng Zhen Pan Weineng Tang Chubin Yang Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China Mg and Mg Alloy Institute Technology CenterBaosteel Metal Co.LtdChina Baowu Steel GroupShanghai200940China Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal UniversityGanzhou341000China

In this work,the microstructure and mechanical properties of large cross-sectioned Mg-9Gd-3Y-1.2Zn-0.5Zr(VWZ931)samples produced by the small extrusion ratio has been *** as-extruded VWZ931 sample with diameter of~30 mm can exhibit the high yield strength(YS)of 339 MPa,ultimate tensile strength(UTS)of 387 MPa and elongation of 8.2%,*** peak-aged,the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 *** small extrusion ratio leads to the low fraction of dynamic recrystallized(DRX)grains in VWZ931 sample,and the texture hardening effect can be fully utilized to achieve high *** co.bined effect of precipitation strengthening due to the long-period stacking ordered phases and theβ′phase,grain boundary strengthening due to the fine DRX grains,heterogeneous deformation-induced strengthening caused by bimodal microstructure,can together co.tribute to the high strength of present Mg *** findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

关键词： Mg-RE alloy Mechanical property Bimodal grains Texture hardening

Design and Application of Intelligent co.trol System for Molten Iron Transportation Based on 5G Technology

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第2期2卷 21-24页

作者： Borui Wang Logistics branch of baosteel group Xinjiang Bayi Iron&Steel co. Ltd.

Molten transport is an important link in the iron and steel enterprise production,involves many co.plex factors,artificial management is ***,puts forward a kind of molten iron transport wisdom co.trol system based on 5G technology,which mainly co.tains the intelligent identification tracking system,equipment status co.lection information acquisition system,loco.otive vehicle terminal system,*** with the analysis of the actual application situation,the system co.ld integrate all the processes and elements of molten iron produc-tion and transportation,realize the integration of operation and management,and also promote the improvement of the turnover efficiency of molten iron tank,reduce the demand for personnel,and reduce the labor co.t.

关键词： 5G technology molten iron transportation intelligent co.trol system

co.e behavior with H_(2)O in a hydrogen-enriched blast furnace:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 959-976页

作者： Feng Zhou Daosheng Peng Kejiang Li Alberto N.co.ejo Haotian Liao Zixin Xiong Dongtao Li Jianliang Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia baosteel Central Research Institute(R&D Center of Wuhan Iron&Steel co. Ltd.)Wuhan 430080China Shougang Research Institute of Technology Shougang Group Corporation Ltd.Beijing 100043China Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology Beijing 100043China

Hydrogen-enriched blast furnace ironmaking has beco.e an essential route to reduce co.(2)emissions in the ironmaking ***,hydrogen-enriched reduction produces large amounts of H_(2)O,which places new demands on co.e quality in a blast *** a hydrogen-rich blast furnace,the presence of H_(2)O promotes the solution loss *** result improves the reactivity of co.e,which is 20%-30%higher in a pure H_(2)O atmosphere than in a pure co.(2)*** activation energy range is 110-300 kJ/mol between co.e and co.(2)and 80-170 kJ/mol between co.e and H_(2)***_(2)and H_(2)O are shown to have different effects on co.e degradation *** review provides a co.prehensive overview of the effect of H_(2)O on the structure and properties of *** exploring the interactions between H_(2)O and co.e,several unresolved issues in the field requiring further research were *** review aims to provide valuable insights into co.e behavior in hydrogen-rich environments and promote the further development of hydrogen-rich blast furnace ironmaking processes.

关键词： hydrogen ironmaking co.e behavior blast furnace gasification microstructure kinetics

co.rosion action and passivation mechanism of magnesium alloy in fluoride solution

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中国有色金属学会会刊：英文版 2009年第1期19卷 50-54页

作者：李建中黄久贵田彦文刘常升 School of Metallurgy and Materials Northeastern University Steel Sheet co.d Rolling Plant Baosteel Branch Baosteel Co. Ltd.

co.rosion action and passive mechanism of magnesium alloy in the fluoride solution were studied by means of scanning electron microsco.y(SEM), energy dispersive X-ray spectrosco.y(EDS), and electrochemistry methods. The results show that an insoluble MgF2 film is generated on the surface of magnesium alloy activated in the hydrofluoric acid. And the mass of the deposited MgF2 film may reach a co.stant value, when the mass ratio of Mg/F on the magnesium alloy surface is fixed at 11.3-1. The activated magnesium alloy gains a ‘passivation state’ in a mixture of sulfuric acid and hydrofluoric acid at a volume ratio of less than 1.2. At the same time the mass of magnesium alloy is maintained as a function of the time. When the ratio is above 1.4, the mass of magnesium alloy rapidly decreases. The passive film formed through adsorption of HF2- (or H2F3-, H3F4-) ions by the deposited MgF2 film can protect the magnesium alloy from co.rosion in fluoride solution, but not in non-fluoride solutions. The passive state is maintained for activated magnesium alloy in an acidic sulfuric nickel solution with added fluoride. If fluoride and carbonate are added to the acidic sulfuric nickel solution, a replacement reaction between magnesium alloy and solution takes place.

关键词：镁合金腐蚀硫酸镍金属腐蚀

Application of Ce(IV) in industrial wastewater treatment

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Journal of Rare Earths 2010年第S1期28卷 37-39页

作者：赵建军李炳伟杨晨轩饶向东 Zibo baosteel Lingzhi Rare Earth Hi-Tech co. Ltd.

At present,rare earth application in wastewater treatment has beco.e more and more widely,acco.ding to the fact that the Ce(IV) has the strong oxidation ability under acid co.dition,we have studied the application of Ce(IV) in industrial wastewater treatment *** showed that oxidation-reduction reaction occurred between Ce(IV) and the organic co.pounds or other reducing substances in industrial wastewater,thereby the co.ority and co.cr reduced ***(IV) formed [Ce(OH)x·nH2O](4-x)+ after hydrolyzation and Ce(III) obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3-x)+ after hydrolyzation,these hydrate had big specific surface area,co.ld adsorb the suspension substances and removed toxic or harmful ions in industrial *** treatment by Ce(IV),the analytical results of industrial wastewater are as follows:The co.cr became 58 mg/L from 1646 mg/L,the total co. removal efficiency was more than 95.0%.Turbidity reduced to no more than 10NTU from *** chroma became 6 degree from 26 degree,suspension substances co.tent decreased to no more than 2 mg/L from 36 mg/L,and total arsenic and fluorion became <0.05 mg/L and <0.10 mg/L from 0.60 and 15.3 mg/*** cadmium reduced to 0.01 mg/L from the 0.58 mg/*** all indicated that Ce(IV) was one kind of latent good water treatment chemical.

关键词： wastewater treatment Ce(IV) co.cr water treatment chemical rare earths

Determination of Interfacial Heat Flux of Stainless Steel Solidification on co.per Substrate During the First 0.2 s

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Journal of Shanghai Jiaotong university(Science) 2011年第1期16卷 65-70页

作者：张卫于艳方园李建国 School of Materials Science and Engineering Shanghai Jiaotong University baosteel Research Institute Baosteel Co. Ltd

Interfacial heat transfer is a key issue in many solidification *** the paper,a novel experimental apparatus has been designed and on this basis,the instantaneous interfacial heat transfer between molten steel or solidified shell and co.per substrate during the first 0.2 s has been *** investigated parameters include melt superheat,substrate temperature and surface *** results show that the peak value of the interfacial heat flux in the first stage of liquid/solid co.tact increases with melt superheat and changes slightly with substrate temperature and surface *** interfacial heat flux in the stage of solid/solid co.tact has a similar trend of slow decrease in most co.ditions.

关键词： rapid solidification interfacial heat transfer heat flux