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RESEARCH AND DEVELOPMENT OF NEW SUPERALLOY REMELTING PROCES

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Acta Metallurgica Sinica(English Letters) 2005年第1期18卷 81-90页

作者： W.Xie BaosteelGroupShanghaiNo.5steelco. Ltd.Shanghai200940China

Shanghai No.5 Steel Co., Ltd. has recently introduced a set of 5-ton protective atmosphere elec-troslag remelting furnace and a set of 10-ton helium-cooling vacuum arc remelting furnace, both of them are the first one of its kind in China. With these equipment, remelting processes about alloy GH4169, CH2132 and GH738 were researched, the process of producing alloy GH4169 by VIM+VAR+ESR triplex-process was developed, and their effects were discussed.

关键词： superalloy argon shield ESR helium cooling VAR VIM+VAR+ESR

Characterization of Nanocrystallizatin Surface Layer of 0.4C-1Cr Low Alloy Steel Prepared by Ultrasonic Particulate Peening

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材料热处理学报 2004年第05B期25卷 1257-1259页

作者： ZHANGJun-bao LIUYu-liang ZHAOXin-qi WUJie SONGHong-wei XIONGTian-ying BaosteelTechnologyCenter BaoshanIron＆SteelCO.LTD.ShanghaiChina InstituteofMetalResearch ChineseAcademyofSciencesShenyangChina

A nanostructured surface layer was fabricated in a quenched and tempered 0.4C-lCr low alloy steel by ultrasonic particulate peening technique. The microstructure of the nanocrystalline surface layer was characterized by means of TEM and Mossbauer spectroscopy. Experimental results reveal that both cementite and ferrite nanocrystals with an average size of 5 nm were formed in the surface layer of the steel, phase transformation of austenite and dissolution of cementite maybe occur in the process of ultrasonic paniculate peening.

关键词：显微结构超声波喷丸处理表面毫微结晶 0.4C-1Cr低合金钢

High temperature oxidation behavior of high speed steel for hot rolls material

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Journal of University of Science and Technology Beijing 2005年第2期12卷 166-171页

作者： LiZhou FangLiu ChangshengLiu DaleSun LisongYao SchoolofMaterialandMetallurgy NortheasternUniversityShenyang110004China TechnologyCenter BaoshanIron＆SteelCo.Ltd.Shanghai201900China

The oxidation characteristics of high speed steel (HSS) were studied at 500 to 800°C. The non-isothermal oxidation and isothermal oxidation (500, 575, 650, 725, 800°C) of HSS were investigated by thermo-gravimetric analysis (TGA). The microstruc- ture, morphology and oxide scale thickness of the isothermal oxidation samples were analyzed by optical microscope (OM), electron probe micro analyzer (EPMA), X-ray diffraction spectrum (XRD) and scanning electron microscope (SEM). The results indicate that the oxidation rate of HSS is very slow at 500 to 650°C, increasing gradually at 650 to 750°C, and drastically at 750 to 800°C, be- cause the phase transformation happens at about 750°C.

关键词： high speed steel high temperature oxidation isothermal oxidation non-isothermal oxidation oxide kinetics

High Temperature Oxidation Behavior of High Speed Steel for Roll in Water Vapor

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材料热处理学报 2004年第5期25卷 134-138页

作者： ZHOULi LIUFang LIUChang-sheng SUNDa-le CollegeofMaterial＆Metallurgy NortheasternUniversityShenyang110004China BAOSHANIron＆steelco. LTD.TechnologyCenterShanghai201900China

The oxidation behavior of high speed steel (HSS) was researched by high temperature thermo balance at 500 to 800 °C in water vapor. The morphology was observed by scanning electron microscope, the microstructure of oxide scale was analyzed by energy dispersive spectrometer and X-ray diffraction spectrum. The results indicate that the mass gain of HSS increases with oxidation temperature rising, the effect of oxidation temperature on the morphology is obvious, water vapor temperature only affects mass gain and affects hardly morphology of oxide scale at the same oxidation temperature. The relevant oxidation mechanisms are also discussed.

关键词：高速钢高温氧化等温氧化集中放大硬质合金

Research and Development of X70 with an Acicular Ferrite Microstructure for West-East Pipeline Project

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工程科学（英文版） 2004年第4期2卷 36-39页

作者： ZhengLei GaoShan TechnicalCentreofBaoshanIron＆steelco.Ltd. Shanghai201900

It is introduced in this paper that a high strength and high toughness X70 pipeline steel with an ultra low acicular ferrite microstructure has been researched and developed at Baosteel according to the requirements of the West East Gas Pipeline(WEGTP) project. The developed steel has higher strength, higher toughness, lower ductile brittle transition temperature and higher dynamic tear resistance than the conventional X70 with ferrite and pearlite microstructure. The excellent properties of the steel are benefited from ultra-low carbon acicular ferrite consisting of interaction of very fine precipitated particles and high-density dislocation. And the steel has been applied on the WEGTP in China.

关键词： X70 微型结构高强度输气管道管线钢

Applications of Mass Customization Production Mode in Chinese Steel Industry

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工程科学（英文版） 2005年第2期3卷 35-40,48页

作者： ZhouShichun DingJianhua ChenChao BaoshanIron＆steelco. Ltd.Shanghai201900

In this paper, the conflict between individual needs of market and the efficient mass production requirement of manufacture under the background of market globalization is discussed, a trend that the main production mode for domestic steel industry should be the mass customization is pointed out, and the problems to be solved for domestic enterprise are analyzed. Summarizing the practice of Baosteel Co. LTD on the new production mode, the achievements and experiences are presented.

关键词：中国钢铁工业市场生产模型

Multiple—tube Permeable Element for Combined Blowing Converter

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China's Refractories 1994年第1期3卷 3-8页

作者： YANGWen－yuan XUWei－hua 等 CentralIron＆SteelResearchInstitute Beijing100081 PanzhihuaIron＆steelco.

The method consisting of cold test and hot simulating has been proved to be reliable for designing permeable *** carbon-magnesia multiple-tube permeable ele-ments which are formed by isostatical pressure have higher density,high heat resistance and good thermoshock resis-tance,The brickwork ,maintenance and erosion meha-nism of permeable elements were *** tehnology of combined blowing wa established based on the peculiari-ties of semi-steel refining at Panzhihua Irom& Steel Co.(PZISC).The service life of permeable elements reahed 600 heats,that means the permeable elements can work synchronitially with converter lining.

关键词：多管可透元素吹气转炉氧化镁 C 碳 MgO 耐火材料

Low Carbon Low Alloy Submicro-Steel with Nano-Precipitates

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工程科学（英文版） 2005年第2期3卷 49-51页

作者： SongHongwei ShiBi ZhangJunbao WangXiufang BaosteelTechnologyCenter BaoshanIron＆SteelCo.Ltd.Shanghai201900

A submicro-steel sheet was successfully fabricated by severe warm-rolling at 773 K through a single pass. The microstructure was characterized first and the thermal stability of the submicro-steel was investigated by annealing the steel at different temperatures. Results indicate that grains are nearly equiaxial with an average diameter of 300 nm for grains near to the surface and 600 nm for grains at the center of the sheet and the submicro-steel can be subjected to annealing at 773 K without obvious grain growth. The formation of the submicro-structure can be related to a severe plastic deformation-induced grain refinement mechanism. The unusually high thermal stability can be attributed to the pinning effect of numerous uniformly-distributed nano-precipitates in the steel. The average diameter of the larger precipitates is about 30 nm and the smaller less than 10 nm.

关键词：超结晶钢纳米沉淀亚微米钢热锯

Development of Refractories for Continuous Casting

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China's Refractories 2004年第1期13卷 9-13页

作者： TIANShouxin JINCongjin YAOJinfu LIZeya BaosteelR&DCenter BaoshanIron&SteelCo.Ltd201900P.R.China

The paper introduces refractories for continuous casting, especially, refractories for continuous casting for clean steel in baosteel. Developing direction of refractories for continuous casting has been pointed out t... 详细信息

关键词： Refractories Review,Continuous casting Tundish