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Experimental Study on corrosion of Stainless steel in Low Temperature Multi effect Seawater Desalination

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第2期2卷 25-31页

作者： Shiyi Zhang Xinggang Ma Baowu Group Shanxi Taigang Stainless steel co. Ltd.Cold Rolling Plant

Starting from the corrosion mechanism,this paper analyzes the characteristics of various types of stainless steel and selects the best performance composite plate composite plate stainless *** and select the most suitable corrosion detection method based on specific practical multi working conditions,discuss the interference factors that affect metal corrosion during experimental simulation,and the advantages of newly developed sheet *** new development of composite board panels,with the substrate and composite materials applying their respective capabilities for MED,will bring breakthrough progress to the scientific research and engineering applica-tion of composite boards.

关键词： seawater desalination corrosion mechanism of stainless steel composite board lamination corrosion rate

Effect of gradient temperature rolling process on promoting crack healing in Q500 heavy plates

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 354-361页

作者： Zhao-hai Gao Wei Yu Xu Chen Bao-sheng Xie Qing-wu Cai collaborative Innovation Center of steel Technology University of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Advanced rolling University of Science and Technology BeijingBeijing 100083China hunan valin rolling steel sheet co.ltd LoudiHunan 417000China

To ensure the quality of heavy plate products as determined by ultrasonic inspection, it is necessary to effectively control defects such as cracks and shrinkage cavities in heavy plates. Generally, some defects such as large size cracks exist due to insufficient deformation in the center of traditionally rolled plates. compared with the traditional rolling process, gradient temperature rolling(GTR) process can effectively increase deformation inside heavy plates. In this study, the effect of GTR on crack healing was analyzed through a comparison experiment with the uniform temperature rolling(UTR). The results show that the GTR process could increase the plastic strain inside the heavy plate and effectively promote the healing process of the preset cracks. The degrees of crack healing at the center and quarter thickness position of the steel plate via GTR were greater than twice those of the plate via UTR. The GTR process can significantly reduce the internal defects of heavy plates and improve the defect detection level of heavy plate products. Also, The GTR process results in the formation of new crystal grains in the crack region, which is crucial to crack healing.

关键词： heavy plates multilayer pack rolling crack healing behavior hot rolling process

Energy Saving Analysis of coal Gas Resource Utilization in Iron and steel Enterprises

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第2期2卷 32-36页

作者： Lu Yan Kai Wang MCC Huatian Engineering Technology co. Ltd. Hebei Puyang Iron and steel co. Ltd.

The article discusses the preparation of a gas balance sheet,as well as the recovery,storage,transporta-tion,and use of *** analysis was conducted on the occurrence and consumption quotas of various gas media,and specific energy-saving measures were elaborated for each *** provides a theoretical reference for saving gas and reducing energy consumption in steel enterprises.

关键词： steel enterprises gas energy conservation

corrosion 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 cold rolling Plant Baosteel Branch Baosteel Co. Ltd.

corrosion action and passive mechanism of magnesium alloy in the fluoride solution were studied by means of scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(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 constant 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 corrosion 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

Novel Method for Evaluating the Aging of Aviation Turbine Engine Oils via High-Temperature Bearing Deposit Tests

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 67-77页

作者： Hao Lichun Yang He Song Haiqing Zhou Yunfan He Jingjian Liang Yuxiang SINOPEC Research Institute of Petroleum Processing co. Ltd.Beijing 100083

Aviation turbine engine oils require excellent thermal-oxidative stability because of their high-temperature ***-temperature bearing deposit testing is a mandatory method for measuring the thermal-oxidative performance of aviation lubricant oils,and the relevant apparatus was improved in the present *** different commercial aviation turbine engine oils were tested,one with standard performance(known as the SL oil)and the other with high thermal stability,and their thermal-oxidative stability characteristics were *** 100 h of high-temperature bearing testing,the SL oil was analyzed by using various analytical techniques to investigate its thermal-oxidative process in the bearing test,with its thermal-oxidative degradation mechanism also being *** results indicate that the developed high-temperature bearing apparatus easily meets the test requirements of method 3410.1 in standard *** viscosity and total acid number(TAN)of the SL oil increased with the bearing test time,and various deposits were produced in the bearing test,with the micro-particles of the carbon deposits being sphere-like,rod-like,and sheet-like in *** antioxidant additives in the oil were consumed very rapidly in the first 30 h of the bearing test,with N-phenyl-1-naphthylamine being consumed faster than ***,the oil thermal-oxidative process involves very complex physical and chemical mechanisms.

关键词： aviation turbine engine oil high-temperature bearing deposit test thermal-oxidative degradation antioxidant additives

Effect of cooling History on Yield Ratio of Fine-grain Ferrite/Pearlite steel

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Journal of Materials Science & Technology 2005年第6期21卷 791-794页

作者： Fuxian ZHU Xin LI Yanchun LIU Xianghua LIU Guangfu SHE Zhongping ZHANG State Key Laboratory of rolling and Automation Northeastern University Shenyang 110004 China Panzhihua steel Group co. ltd Panzhihua 617067 China

Effect of different cooling history on yield ratio of HP295 steel for welded gas cylinder was studied and the result implied that both fine microstructure and good mechanical properties can be attained by using two-stage cooling and controlling the coiling temperature. The yield ratio of HP295 steel sheet was reduced to less than 0.8 by twostage cooling process. The pass percent of yield ratio was enhanced from less than 90% to 100%. The mechanical properties satisfied the criteria of GB6653-1994.

关键词： HP295 steel sheet Yield ratio Two-stage cooling coiling temperature

combination Effect of Si and P on Tertiary Scale Characteristic of Hot Rolled Strip

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Journal of Iron and steel Research International 2015年第3期22卷 232-237页

作者： Yang YU Chang WANG Lin WANG Jin CHEN Ya-jun HUI Chang-ku SUN sheet Metal Research Institute Shougang Research Institute of Technology Department of Technology and Quality Shougang Qian'an Iron and Steel Co.Ltd.

For high strength interstitial free （IF） steel containing P element, the salt and pepper （SP） defects exist on the strip surface and could not be eliminated effectively by optimizing the hot rolling process, such as temperature and cooling water. The combination effect of Si and P on the characteristic of tertiary scale has been studied comprehensively by scanning electron microscopy （SEM） and electron probe microanalysis （EPMA）, and the concept is proposed firstly that Si and P are of combination effect which can be utilized to eliminate the SP defect. The results show that the SP defects were induced by the rolled-in scale during finish rolling. P can be enriched at the interface between substrate and tertiary scale, which is easy to decrease the adhesion of tertiary scale. However, Si enrichment at the interface between substrate and tertiary scale can increase the adhesion. The SP defects can be eliminated completely, which is attributed to the accompanying enrichment of Si and P.

关键词： high strength IF steel containing P salt and pepper defect tertiary scale Si-P combination hot rolling

Microstructure,Texture,and Formability of Nb+Ti Stabilized High Purity Ferritic Stainless steel

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Journal of Iron and steel Research International 2010年第6期17卷 47-52页

作者： DU Wei JIANG ,Lai-zhu SUN Quan-she LIU Zhen-yu ZHANG Xin State Key Laboratory of rolling and Automation Northeastern University Shenyang 110004 Liaoning China Baosteel Research Institute Baoshan Iron and Steel Co Ltd Shanghai 200431 China

The microstructure, texture, and formability of Nb＋Ti stabilized high purity ferritic stainless steel were investigated. The interstitial element carbon and nitrogen could be fully stabilized with niobium and titanium, and the precipitates were mainly composed of TiN and NbC. By analyzing the texture in various thermomechanical processes, the intensity of α-fiber obtained during hot rolling was reduced greatly after annealing and non-uniform γ-fiber was obtained. The favorable γ-fiber was observed in cold rolled and annealed sheet, whereas the maximum value of texture is located in （554）〈225〉. The formation of this shifted texture was mainly attributed to the influence of ＂Zener＂ drag and selective growth. Finally, the high purity steel showed an excellent formability, which was reflected in a marked increase in average plastic strain ratio （average of 1.70） compared with the traditional steel sheet （average of 1.06）.

关键词： texture microstructure formability dual stabilization

Temperature-Induced Unfolding Pathway of Staphylococcal Enterotoxin B:Insights from Circular Dichroism and Molecular Dynamics Simulation

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食品科学 2024年第18期45卷 55-76页

作者： LIU Ji ZHANG Shiyu ZENG Yu DENG Yi Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu 610041China college of Food Sciences and Technology Southwest Minzu UniversityChengdu 610041China Wuliangye Group co.ltd. Yibin 644000China

In this study,circular dichroism(CD)and molecular dynamics(MD)simulation were used to investigate the thermal unfolding pathway of staphylococcal enterotoxin B(SEB)at temperatures of 298–371 and 298–500 K,and the relationship between the experimental and simulation results were *** computational findings on the secondary structure of SEB showed that at room temperature,the CD spectroscopic results were highly consistent with the MD ***,under heating conditions,the changing trends of helix,sheet and random coil obtained by CD spectral fitting were highly consistent with those obtained by *** order to gain a deeper understanding of the thermal stability mechanism of SEB,the MD trajectories were analyzed in terms of root mean square deviation(RMSD),secondary structure assignment(SSA),radius of gyration(R_(g)),free energy surfaces(FES),solvent-accessible surface area(SASA),hydrogen bonds and salt *** results showed that at low heating temperature,domain Ⅰ without loops(omitting the mobile loop region)mainly relied on hydrophobic interaction to maintain its thermal stability,whereas the thermal stability of domain Ⅱ was mainly controlled by salt bridges and hydrogen *** high heating temperature conditions,the hydrophobic interactions in domain Ⅰ without loops were destroyed and the secondary structure was almost completely lost,while domain Ⅱ could still rely on salt bridges as molecular staples to barely maintain the stability of the secondary *** results help us to understand the thermodynamic and kinetic mechanisms that maintain the thermal stability of SEB at the molecular level,and provide a direction for establishing safer and more effective food sterilization processes.

关键词： staphylococcal enterotoxin B circular dichroism molecular dynamics simulations temperature-induced unfolding