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Effect of zirconium on inclusions and mechanical properties of China low activation martensitic steel

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Journal of Iron and Steel Research International 2021年第9期28卷 1168-1179页

作者： Guo-xing Qiu Dong-ping Zhan Lei Cao hui-shu zhang School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Materials Engineering Department Hebei College of Industry and TechnologyShijiazhuang050091HebeiChina School of Metallurgy Engineering Liaoning Institute of Science and TechnologyBenxi117004LiaoningChina

The effects of 0.01–0.11 wt.%Zr on the inclusions,microstructure,tensile properties,and impact toughness of the China low activation martensitic steel were *** showed that Zr exhibits good deoxidation and desulfurization *** scanning electron microscope was used to examine the inclusions in the *** main inclusions in the alloys were Zr–Ta–O,Zr–O,and Zr–O–***,some blocky Zr-rich inclusions appeared in Zr-2 and Zr-3 *** martensitic structures were observed in the alloys,and average prior austenite grain sizes of 21.1,15.7,and 14.8µm were obtained for Zr-1,Zr-2,and Zr-3 steels,***,increasing Zr content of the steels deteriorated their mechanical property,owing to the blocky *** alloy with 0.01%Zr resulted in excellent mechanical properties due to the fine inclusions and the precipitation of Zr3V3C *** of 576 and 682 MPa were obtained for the yield strength and ultimate tensile strength of Zr-1 alloy,***,the ductile–brittle transition temperature of the alloy decreased to−85℃.

关键词： China low activation martensitic steel Zr Inclusion Tensile strength Ductile-to-brittle transition temperature

Formation of Hearth Sediment during Vanadium Titano-magnetite Smelting in Blast Furnace No.7 of Chengde Iron and Steel Company

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Journal of Iron and Steel Research International 2015年第11期22卷 1009-1014页

作者： Xiao-jie LIU Qing Lü shu-jun CHEN Zhen-feng zhang shu-hui zhang Yan-qin SUN School of Materials and Metallurgy Northeastern University College of Metallurgy and Energy Hebei Key Laboratory for Advanced Metallurgy Technology North China University of Science and Technology Chengde Branch Hebei Iron and Steel Group Co. Ltd.

The large quantity of sediment produced in the hearth during vanadium titano-magnetite smelting in a blast furnace（BF） affects the stability of the blast furnace operation. Testing and analysis of the sediment in the hearth of Chengde Iron and Steel Company？s BF No.7 revealed that it was mainly concentrated in the location below the tuyere and above the iron notch. Notably, some of the bonding material（sediment） consisted of greater than 50% pig iron, and the pig iron distributed in the slag was granular. It is proposed that a large quantity of Ti C and Ti（C,N） are deposited on the surface of the pig iron. These high melting point materials mix with iron drops, preventing the slag from flowing freely, thus leading to the formation of bonding materials. In addition, the viscosity and melting temperature of the slag in the tuyere areas fluctuate greatly, and thus the properties of the slag are unstable. Moreover, the slag contains large quantities of carbon, which results in the reduction of Ti O2. The resultant precipitation of Ti is followed by the formation of Ti C in the slag, which also leads to an increase in the viscosity of the slag and difficulty in achieving separation of the slag-iron. In fact, all of these factors interact with each other, and as a result, sediment is formed when the operating conditions in the hearth fluctuate.

关键词： vanadium titano-magnetite hearth sediment slag pig iron Ti(N C)

Effect of H2 addition on process of primary slag formation in cohesive zone

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Journal of Iron and Steel Research International 2020年第2期27卷 132-140页

作者： Ya-na Qie Qing Lyu Chen-chen Lan shu-hui zhang Ran Liu College of Metallurgy and Energy Key Laboratory for Advanced Metallurgy TechnologyNorth China University of Science and TechnologyTangshan 063009HebeiChina

Based on the technology of gas-injection blast furnace(BF),the characteristics of primary slag formation with H2 addition were *** results indicate that,compared with traditional BF,the primary melt is formed at a lower temperature,which promotes the deformation of the solid burden *** the increase in temperature and H2 content,the quantity of formed melt containing FeO decreases sharply,corresponding to the crystallization of solid 2CaO Si02 during reduction.A wider softening range and narrower melting zone could be found in the gas-injection BF with a higher reduction *** permeability of burden layer is ameliorated as a result of decreased melt *** influence of H2 on the high-temperature properties of burden is not so conspicuous when the H2 addition is from 10 to 15 vol.%against 5 to 10 vol.%.What is more,the slag shows a better liquidity with the decrease in basicity,owing to the transformation of melt composition from a primary phase field with high melting point to that with low melting *** process of slag forming in gas-injection BF is characterized by earlier melt formation,less primary slag,higher melting temperature,better permeability and better liquidity,and the phase compositions of primary slag are close to those of final slag.

关键词： Reduction degradation Primary slag formation Melt Hydrogen addition Gas-injection blast furnace

Chromium Recycling from Argon-oxygen Decarburization Dust in Hot Metal Pre-dephosphorization Process

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Journal of Iron and Steel Research International 2016年第9期23卷 867-873页

作者： Dong-ping ZHAN Yang-peng zhang Zhou-hua JIANG De-wei WANG hui-shu zhang School of Metallurgy Northeastern University Metallurgical Engineering College Liaoning Institute of Science and Technology

The chromium recycling from the stainless steel dust of an argon-oxygen decarburization （AOD） furnace during a hot metal pretreatment process was investigated. Experiments at different temperatures or with different amounts of AOD dusts were carried out in a laboratory furnace equipped with MoSi2 heating elements and subsequently industrial experiments were conducted in a stainless steelmaking factory, in order to study the thermodynamic mechanism of C and Si reacted with Cr2O3 to get Cr from AOD dust. The results showed that the reaction between C and Cr2 O1 occurred below 1572.18 K. Although its reducing ability was weaker than that of Si, C enabled the Cr in Cr2O3 in the AOD dust to be recycled using the Si in the slag. By combining the AOD dust added in an earlier stage, the hot metal pretreatment slag added in a later stage could not only recycle Cr from AOD dust but also remove Si, S, and P. Higher hot metal temperatures resulted in higher Cr content and lower remained P concentration in the molten iron.

关键词： stainless steelmaking AOD dust chromium recycling hot metal pre-dephosphorization

Electronic Effect of Carbon Support on Pt Catalyst Supported on Graphite Intercalation Compound

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Chemical Research in Chinese Universities 2010年第3期26卷 465-471页

作者： WEI Ang WANG Qing-jing ZHAO Xiao-hui zhang shu-yong Key Lab of Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China

Graphite intercalation compounds（GIC） were tested as an experimental model for studying the electronic effect of carbon support on the catalytic activity and poisoning tolerance of Pt catalyst for direct methanol fuel cells. The GIC samples with different intercalation degrees were prepared by electrolyzing graphite flake in H2SO4 for varying the periods of time. The GIC-supported Pt catalyst was deposited electrochemically. The catalytic activity and poisoning tolerance of the GIC-supported Pt catalysts were evaluated. It was found that GIC with sulfate anion as intercalate was able to catalyze methanol electrooxidation, which could be related to the positive charges generated on the graphite layer upon intercalation. As intercalation degree increased, the catalytic activity of the GIC-supported Pt catalyst decreased while the poisoning tolerance improved. This suggests that electron donation from support to catalyst had great effect on both catalytic activity and poisoning tolerance of Pt catalyst. And intercalation can be adopted as another important way to make modification on carboneous catalyst support.

关键词： Catalyst support Electronic effect Graphite intercalation compound Catalytic activity Poisoning tolerance

Effects of SiO_(2) on the preparation and metallurgical properties of acid oxidized pellets

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 629-636页

作者： Jian-guang Lu Chen-chen Lan Qing Lyu shu-hui zhang Jian-ning Sun School of Metallurgy Northeastern UniversityShenyang 110819China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063009China HBIS Group Hansteel Company Handan 05600China

The effects of SiO_(2) content on the preparation process and metallurgical properties of acid oxidized pellets, including compressive strength, reduction, and softening–melting behaviors, were systematically *** structures, elemental distribution, and pore size distribution were varied to analyze the mechanism of the *** results show that with an increase in SiO_(2) content from 3.51 wt%to 7.18 wt%, compressive strength decreases from 3150 N/pellet to 2100 N/pellet and reducibility decreases from 76.5% to 71.4%.The microstructure showed that pellets with high SiO_(2) content contained more magnetite in the mineralogical ***, some liquid phases appeared, which hindered the continuous crystallization of ***, the softening–melting properties of the pellets clearly deteriorated as the SiO_(2) content *** increasing SiO_(2) content, the temperature range of the softening–melting zone decreased, and the maximum differential pressure and the comprehensive permeability index increased *** acid oxidized pellets are used as the raw materials for blast furnace smelting, it should be combined with high basicity sinters to improve the softening–melting behaviors of the comprehensive charge.

关键词： acid oxidized pellets SiO_(2)content metallurgical property mineralogical structure

Computational Insights into Interactions between Ca Species and α-Fe_2O_3(001)

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Journal of Iron and Steel Research International 2014年第4期21卷 413-418页

作者： Yan-qin SUN Qing L Xin-yu WAN shu-hui zhang Jiong-ming zhang School of Materials and Metallurgy Northeastern University College of Metallurgy and Energy Hebei United University School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

CaC12 can be sprayed onto sinter surface, which can improve the low temperature reduction degradation index （RDI＋3.15） of sinter. This has been recognized; however, there are various opinions on the inhibition mechanism of it. At the same time, the corrosion of C1 element on equipment is very serious. First-principle calculations based on density functional theory were performed to investigate the binding mechanisms of calcium species on a a-Fe2 03 （0 0 1） surface. This is crucial in demonstrating the role of the CaC12 on improving the low temperature reduction degrada tion index. It has been determined that C1 could greatly increase the adsorption of the vacuum layer for the Ca/Fe2 03 system and the relaxation produced by adsorption made bond length decrease, bond energies increase and structure compact. Those are the main reasons that inhibiting the reduction disintegration of sinter.

关键词： Ca species adsorption a-Fe2 03 (0 0 1) surface reduction differentiation index CASTEP program

Phosphorus Capacity of CaO-SiO_2-Al_2O_3-MgO-Fe_xO Slag

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Journal of Iron and Steel Research International 2015年第5期22卷 377-381页

作者： Jian-chao LI Qing L Xiao-jie LIU shu-hui zhang Dong-hui LIU School of Materials and Metallurgy Northeastern University College of Metallurgy and Energy North China University of Science and Technology

CaO-SiO2-Al2O3-MgO-Fex O slag occurs in the production process of Corex ironmaking technology. Most of its metallurgical properties, especially the phosphorus property, are different from the slag produced from blast furnace or converter. In order to explore the dephosphorization ability of CaO-SiO2-Al2O3-MgO-Fex O slag, its phosphorus capacity was measured at 1673 K by gas-slag-metal equilibrium technique. An iron crucible was used as the reaction vessel, Ag alloy with 0.2 % P was used as the metal phase which equilibrated with CaO-SiO2-Al2O3-MgO-Fex O slag, and a constant flow of CO-CO2-N2 gas was used to provide oxygen partial pressure in the experi- ment. The effects of MgO, Fex O and basicity on slag phosphorus capacity were investigated by single factor test. The results show that the phosphorus capacity rises firstly and then decreases with increasing MgO content under the condition of basicity 1.3, Fe2 O content of 20% and A12 03 content of 12%. The phosphorus value reaches maximum as the MgO content is 8%. When the basicity of slag is 1.1, MgO content is 10%, and Al2O3 is 12%, the phos- phorus capacity increases with the increase of Fe, O content. The phosphorus capacity rises linearly when the basicity is increased from 1.1 to 1. 5.

关键词： smelting reduction CaO-SiO2-Al2O3-MgO-Fex O slag phosphorus capacity composition

Virus Location and Lymphocyte Apoptosis in Lymph Nodes of Piglets Infected with PCV-2

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Agricultural Sciences in China 2008年第4期7卷 507-512页

作者： SHI Lū-juan HAN hui-li zhang shu-xia College of Veterinary Medicine Nanjing Agricultural University Nanjing 210095 P.R.China

The present study has been performed to understand the location of the virus, type of apoptotic cells, and their relation to lymph nodes of piglets infected with porcine circovirus type Ⅱ （PCV-2）. Nine 32-day-old conventional piglets free of infection with PCV-2 were used, and distributed into three groups： control group （n = 3）, piglets inoculated with PCV-2 alone （PCV-2, n = 3）, and PCV-2 inoculated and KLH immunostimulated group （PCV-2 ＋ KLH, n = 3）. Superficial inguinal lymph nodes from all piglets were collected for histological examination after 32 days postinoculation, and immunohistochemistry for PCV-2 detection. Location of apoptotic cells was detected with TdT-mediated dUTP nick end labeling （TUNEL） and cell cycle, and the apoptotic rates were measured by flow cytometry. The characteristic histopathological lesions of the piglets in PCV-2 and PCV-2 ＋ KLH were lymphocyte depletions in the cortex and paracortex of the lymph nodes, epithelioid-like macrophage infiltration, and intracytoplasmic inclusion bodies presented in epithelioid-like macrophages. PCV-2 was mainly found in epithelioid-like macrophages by immunohistochemistry. In the lymph nodes, lymphocytes presented higher apoptotic rates in the cortex by TUNEL, special B-cell areas, and similar apoptotic cells were found in this compartment in the control. The apoptotic rates of the lymph nodes were 0.41, 3.34, and 4.88% in the control, PCV-2, and PCV-2 ＋ KLH groups by flow cytometry, respectively. The apoptotic rates of lymph nodes for PCV-2 and PCV-2 ＋ KLH piglets were significantly higher than those for the control group （P〈0.05 and P〈0.01）. The proliferation index （PI） was 0.17_＋0.01, 0.12_＋0.01 and 0.12_＋0.04 in the control, PCV-2, and PCV-2 ＋ KLH group, the PI of the control group was higher than that of the other groups, but without the statistical difference. PCV-2 can induce lymphocyte depletion in lymph nodes of piglets by blocking cell proliferation and promoting apoptosis. This is one of th

关键词： apoptosis virus located lymph node PCV-2 piglets