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Baosteel Technical Research 2017年第1期11卷 26-31页

作者： YAN Bo HAO Yingmin XIA Xiaoming jiao sihai Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201900China Hot Rolling Mill of Meishan Baoshan Iron&Steel Co.Ltd.Nanjing 210039JiangsuChina

The checkered plate,also known as the floor/pattern plate ,has a raised pattern that provides excellent skid resistance for a wide range of applications. As one of most commonly used products, the carbon steel checkered plate requires a high-cost coating for corrosion resistance. Although the austenitic stainless steel checkered plate meets corrosion resistance requirements ,it does not necessarily provide high overall performance due to its low yield strength, which means greater thickness and weight. Combining the advantages of stainless and carbon structural steel, Baosteel has developed a new roll-bonded clad checkered plate that exhibits high performance in skid resistance, strength, and corrosion resistance. Metallographic analysis shows the cladding interfaces to be very good, with stainless steel filling the whole pattern and a uniform microstructure in the different cladding layers. The yield strength and tensile strength of the product are 470 MPa and 610 MPa, respectively. In addition,the fracture morphology exhibits excellent interfacial bonding properties. We performed external and internal bend tests at room temperature, 180°, and 0.7a without the development of any cracks, which indicates its excellent formability.

关键词： clad rolling roll-bonded clad checked plate microstructure mechanical properties

Dynamic Recrystallization Behaviour of Nb-Ti Microalloyed Steels

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 551-557页

作者： MA Liqiang LIU Zhenyu jiao sihai YUAN Xiangqian WU Di Shenyang Metrology Testing Institution Shenyang 110179 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Institute of Research and Development Baosteel Co. Shanghai 201900 China

The dynamic recrystallization （DRX） behavior of Nb-Ti microalloyed steels was investigated by isothermal single compression tests in the temperature range of 900-1 150 ℃ at constant strain rates of 0.1-5 s^-1. DRX was retarded effectively at low temperature due to the onset of dynamic precipitation of Nb and Ti carbonitrides, resulting in higher values of the peak strain. An expression was developed for the activation energy of deformation as a function of the contents of Nb and Ti in solution as well as other alloying elements. A new value of corrective factor was determined and applied to quantify the retardation produced by increase in the amount of Nb and Ti dissolved at the reheating temperature. The ratio of critical strain to peak strain decreases with increasing equivalent Nb content. In addition, the effects of Ti content and deformation conditions on DRX kinetics and steady state grain size were determined. Finally, the kinetics of dynamic precipitation was determined and effect of dynamic precipitation on the onset of DRX was clarified based on the comparison between precipitate pinning force and recrystallization driving force.

关键词： Nb-Ti microalloyed steels dynamic recrystallization activation energy of deformation dynamic precipitation

Novel water-based nanolubricant with superior tribological performance in hot steel rolling

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International Journal of Extreme Manufacturing 2020年第2期2卷 102-112页

作者： Hui Wu Fanghui Jia Zhou Li Fei Lin Mingshuai Huo Shuiquan Huang Sepidar Sayyar sihai jiao Han Huang Zhengyi Jiang School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongong NSW 2522Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbane QLD 4072Australia ARC Centre of Excellence for Electromaterials Science(ACES) Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of WollongongWollongongNSW 2500Australia Australian National Fabrication Facility-Materials Node Innovation CampusUniversity of WollongongWollongong NSW 2500Australia Baosteel Research Institute(R&D Centre) Baoshan Iron&Steel Co.Ltd.Shanghai 200431People’s Republic of China

Novel water-based nanolubricants using TiO2 nanoparticles(NPs)were synthesised by adding sodium dodecyl benzene sulfonate(SDBS)and glycerol,which exhibited excellent dispersion stability and *** tribological performance of the synthesised nanolubricants was investigated using an Rtec ball-on-disk tribometer,and their application in hot steel rolling was evaluated on a 2-high Hille 100 experimental rolling mill,in comparison to those without *** water-based nanolubricant containing 4 wt%TiO2 and 0.4 wt%SDBS demonstrated superior tribological performance by decreasing coefficient of friction and ball wear up to 70.5%and 84.3%,respectively,compared to those of pure *** addition to the lubrication effect,the suspensions also had significant effect on polishing of the work roll *** resultant surface improvement thus enabled the decrease in rolling force up to 8.3%under a workpiece reduction of 30%at a rolling temperature of 850◦*** lubrication mechanisms were primarily ascribed to the formation of lubricating film and ball-bearing effect of the TiO2 NPs.

关键词： water-based nanolubricant TiO2 nanoparticle tribological performance hot steel rolling

Accuracy improvement of the traditional rolling force and torque model powered by an industrial data platform

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Baosteel Technical Research 2022年第2期16卷 1-9页

作者： WANG Quansheng jiao sihai Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 200940 China

The calculation results of the rolling force and torque model based on Orowan's differential equation numerical solution method do not fit with the industrial measurements very *** particular,a quite large deviation on the torque model was *** the basis of analyzing the shortcomings of the existing method,an improved rolling force and torque model algorithm aided by the Process Integrated Data Application System platform is ***,the calculation accuracy of the rolling torque model is *** improved models are verified by 1711136 records of a data *** improved models are also based on Orowan's differential *** coefficients,namely,friction factor and forward slip,are recognized as the crucial factors to be determined from industrial measurements to improve the ***,the proposed method is a hybrid method that can be used to deeply understand the rolling process and improve the model's accuracy by combining traditional plastic mechanics and data-driving global optimization *** paper proposes a new approach to studying theoretical rolling deformation models powered by the industrial data platform.

关键词： data platform rolling force torque numerical method hybrid strategy

Effect of Ti content on the yield strength of Nb-Ti microalloyed steels

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Baosteel Technical Research 2009年第4期3卷 53-55页

作者： YUAN Xiangqian jiao sihai Metallurgical Process Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

The hot rolling experiment investigates into the relationship between the microstructures and the mechanical properties of Nb-Ti microalloyed steels with various Ti contents. The results indicate that the effect of the bainite fraction of Nb-Ti microalloyed steels on the yield strength of the steels is not related to Ti content, while the slope of the Hall- Petch relationship decreases with the increase of Ti content. Accordingly, the Misra model for the yield strength of Nb-Ti microalloyed steels is modified, and the factors which cause the change in the slope of Hall-Petch relationship are discussed.

关键词： Nb-Ti microalloyed steel yield strength Hall-Petch

Mechanical and corrosion properties of N08825 CRA clad pipeline steel

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Baosteel Technical Research 2020年第3期14卷 23-30页

作者： LIANG Xiaojun jiao sihai DING Jianhua Research Institute Baosha Iron&Steel Co.Ltd.Shanghri 201999China

Corrosion-resistant-alloy(CRA)clad steel combines the good mechanical properties of the base material and the excellent corrosion resistance of the cladding material,while also being much more economical than solid *** gas and oil fields can have high concentrations of H2 S,Cl-,CO2,and other chemicals,the pipes used to transport gas or oil must have high corrosion resistance and good mechanical *** N08825 nickel-based alloys with their excellent corrosion resistance can be a good cladding material in clad *** this paper,UNS N08825+X65 clad steel was produced by two different *** thermomechanical and quenching and tempering processes were investigated and their mechanical properties and corrosion resistance were *** corrosion and pitting corrosion tests were conducted and the results were evaluated.A high-pressure and high-temperature gas-field environment was also simulated to test the stress corrosion cracking of the *** results show that both clad plates have good mechanical properties and excellent corrosion *** experimental results were compared and the differences between the two processes were identified and discussed.

关键词： clad steel TMCP quenching tempering pipeline corrosion mechanical properties

Study on the interface of direct hot rolling titanium-clad steel plates

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Baosteel Technical Research 2017年第1期11卷 32-39页

作者： SUN Jifeng LIANG Xiaojun jiao sihai Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201900China

In this study,the interface characteristics of a direct hot rolling titanium-clad steel plate were analyzed, and the mechanism of interface cracking was explored. The detrimental effect from the formation of TiFe ,TiC,and a Si-enriched layer on the bonding strength was clarified, and an industrial-scaled titanium-clad steel plate with shear strength over 200 MPa was produced with a carefully set schedule accordingly. It was found that hot rolling titanium-clad steel plates had a flat interface without obvious cracks. In the rolling process,both Ti and Fe atoms interdiflhsed,but Fe difthsed much faster than Ti. The Fe-diffused area consisted of three regions. After a high temperature heat treatment, the diffusion depth of Fe and Ti elements increased significantly and evident Si segregation and TiFe layers were identified. Thermal cracking initiated in the Si segregation layer and then propagated along the TiFe layer and Fe-diffused layer on the titanium side.

关键词： titanium-clad steel plate interface diffusion heat treatment

Microstructure and properties of S30403+Q345R roll-bonded clad steel plate for pressure vessels

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Baosteel Technical Research 2017年第1期11卷 40-48页

作者： HOU Hong ZHANG Hanqian jiao sihai School of Materials & Metallurgy Northeastern University Research Institute Baoshan Iron & Steel Co.Ltd.

To meet the demand of the domestic pressure vessel industry for roll-bonded clad steel plates, Baosteel has developed an S30403 ＋ Q345R roll-bonded clad steel plate. Comprehensive inspections of the composition, microstructure, and properties are made to systematically evaluate the steel plate in the normalized and normalized ＋ stress relieved states. The results show the cladding interface of the S30403 ＋ Q345R roll-bonded clad steel plate has high shear strength, the base metal has good properties, and the mechanical properties of the steel plate head and tail are uniform. The performance is fully consistent with the technical requirements of the roll-bonded clad steel plate for pressure vessels.

关键词： pressure vessel S30403 + Q345R roll-bonded clad steel plate normalized stress relieved property

Study on grain refinement of interstitial-free steel during continuous frictional angular extrusion

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Baosteel Technical Research 2012年第4期6卷 55-61页

作者： YAN Bo HUANG Yan jiao sihai Metallurgical Process Division Research Institute Baoshan Iron and Steel Co. Ltd. Confae Technology Ltd

To explore the application of severe plastic deformation for grain refinement in steel production, a new method called continuous frictional angular extrusion （CFAE） was applied to refine the grain of interstitial-free steel. The deformation was carried out at room temperature and individual sheet specimens were processed in different number of passes. An overall grain size of 200nm was achieved after 8 passes and the proportion of high-angle boundaries to the total boundaries was more than 60%. Through the characterization of high resolution EBSD, X-ray diffraction （XRD） and hardness testing,this paper discussed the evolution of microstructures and textures during deformation and explored the development direction of the method.

关键词： severe plastic deformation continuous frictional angular extrusion (CFAE) interstitial-free steel ultrafine grained structure texture EBSD XRD

Investigation of separation phenomenon in high-toughness X70 thick-walled linepipe steel

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Baosteel Technical Research 2015年第3期9卷 35-40页

作者： DING Jianhua LIANG Xiaojun jiao sihai Research Institute Baoshan Iron & Steel Co.Ltd.

Separation is a commonly observed phenomenon during drop weight tear testing in high-toughness linepipe steels. Severe separation is harmful because it may cause fracturing or bursting of pipes. In this study, a quantitative measurement of separation was proposed, and using this new method, a relationship between the separation and microstructure was determined and discussed. The microstructures observed using optical and scanning electron microscopy revealed that the separation was related to the mixed ferfitic and bainitic microstructures, or rather,it was related to the carbon enrichment in bainite.

关键词： linepipe steel DWTT separation bainite thermomechanical processing cleavage fracture