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co.trol of nonmetallic inclusions of non-oriented silico. steel sheets by the rare earth treatment

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Baosteel technical Research 2011年第2期5卷 41-45页

作者： ZHANG Feng MA Changsong WANG BO ZHANG Peili MA Zhigang ZHANG Yi Key Laboratory. for Ferrous Metallurgy and Rescurces Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China Silico. steel Department Baoshan Iron ＆ Steel Co.Ltd. Shanghai 200941 China steelmaking Plant Baoshan Iron ＆Steel Co. Ltd. Shanghai 200941 China Analysis ＆ Testing center Research InstituteBaoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Based on the industrial production of non-oriented silico. steel, the rare earth （RE） treatment during the Ruhrstahl Heraeus （RH） refining process was studied. The morphology and the size distribution were observed for the steel specimens treated with different RE treatment co.ditions. Furthermore, the formation and change of the nonmetallic inclusion characteristics of finished steel sheets after the RE treatment were discussed. The results have shown that in the present work,the suitable RE metal additions are 0.6 -0.9 kg/t steel. After the suitable RE treatment,the formation of AIN and MnS inclusions were restrained, and the aggregation, flotation and removal of nonmetallic inclusions were efficiently promoted and the cleanliness of liquid steel was significantly increased. Meanwhile, the total oxygen co.centration reached the minimum value and thle desulfurization efficiency was optimal ,and the type of main inclusions was approximately spherical or elliptical spherical RE radicle inclusions whose size was relatively large.

关键词： non-oriented silico. steel Ruhrstahl Heraeus (RIt) refining rare earth (RE) treatment nonmetallic inclusions

Application of “soft canning” heat preservation technique in the superalloy forging process

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Baosteel technical Research 2011年第4期5卷 21-24页

作者： WANG Zixing CHEN Guosheng ZHOU Dianhua WANG Qingzeng Special steel Technology center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China Special steel Business Unit Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China

The ＂soft canning＂ heat preservation technique is invented by Baoshan iron ＆ steel co., Ltd. （Hereafter referred to Baosteel）, using the flexible insulation material which can be stuck on the surface of the heated ingot or billet in the superalloy thermal process. This adhesive insulation material can reduce the temperature drop of the ingot or billet during the transferring or hot working process, and can deform with the billet without dropping. The surface temperature drop can be effectively reduced, so the products can be obtained a good surface quality and the structural uniformity can be improved. The technique is applied to hard-wrought superalloy forging of co.ging, superalloy rods finished forging fire and superalloy hot die forging processing,and good results have been achieved.

关键词： soft canning superalloy heat preservation forging

Application of the titanium alloy in civil aviation

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Baosteel technical Research 2011年第4期5卷 25-35页

作者： XU Feng YANG Zhao WANG Ning Special steel Technology center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China

Titanium and titanium alloys have been widely used in civil aviation due to their high strength-to-weight ratio and excellent co.rosion resistance. A brief history of the development of titanium for aerospace application, including application areas and reasons why aviation manufacturing uses titanium, is introduced in this study. Its future trend is analyzed and discussed as well, including information on trends of the alloy development, melting technologies, present and emerging manufacturing technologies, new alloys and some new techniques for producing low co.t titanium.

关键词： aerospace applications airframe engine titanium alloy

Study on the mechanical properties and service life of H13 mandrels

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Baosteel technical Research 2011年第2期5卷 53-58页

作者： TIAN Yuxin LU Minghe CAI Haman ZHANG Jinghai GUO Junxia Special steel Technology center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China

The microstructures and mechanical properties of H13 mandrels made by Baosteel and foreign co.panies were investigated in this study. Based on the co.parison research, the processes were optimized, such as steelmaking, heat treatment and multiple forging processes. The quality of Baosteel mandrels was greatly improved by increasing the homogenizing of an annealing temperature and refining processes. The results of the pilot trial showed that the average number of piercing steel tubes for Baosteel mandrels was over 3000 ,which reached the level of imported mandrels.

关键词： H13 mandrel steer mechanical properties service life

Study on the surface cracking in hot-rolled plates of Fe-23Mn-2Al-V austenitic steel

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Baosteel technical Research 2011年第1期5卷 60-64页

作者： LIAO Hongjun MAO Zhengdong WANG Lintao ZHU Jun LI Yuan ZHANG Heng Special steel Business Unit Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China Special steel Technology center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

The study introduces the chemical co.position, mechanical properties, physical properties and production processes of the Fe-23Mn-2Al-V austenitic steel. Investigations were made into the formation of cracks in the hot-rolled Fe-23Mn-2Al-V steel plates,with optical microsco.y （OM）,scanning electron microsco.y （SEM） and energy dispersive spectrum （EDS）. The results have shown that intergranular oxidation in the reheating furnace is the main cause of the cracks on the surface of the hot-rolled steel plates. The surface cracking can be largely avoided by co.trolling the remaining oxygen co.tent in the reheating furnace and improving co.tinuous casting （ CC ） processes to increase the thickness of fine equiaxed grain layer of the steel slabs.

关键词： Fe-23Mn-2Al-V austenite steel crack intergranular oxidation

Effect of intergranular β phase on the rupture plasticity of the low expansion Inco.el 783 superalloy

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Baosteel technical Research 2011年第4期5卷 16-20页

作者： WEI Zhigang ZHAO Yating XIE Wei CHEN Guosheng Special steel Technology center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China Special steel Business Unit Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China

High temperature rupture specimens with different rapture plasticity are investigated. The rupture fracture failure of Inco.el 783 superalloy is researched by analyzing the fracture surface and microstructure of the rupture specimens. The intergranular β phase precipitated sufficiently with favorable morphology can efficiently strengthen grain boundaries that can achieve a full plastic deformation of grains. Additionally, the intergranular β phase can effectively restrain the occurrence and expansion of intergranular cracks during the rupture test. The intergranular β phase insufficiently precipitated can weaken the intergranular co.esion and lead to the occurrence and expansion of cracks; thus, the grains cannot be fully deformed before breaking. Therefore, the β phase precipitated in the grain boundaries can significantly increase the rupture plasticity of Inco.el 783 superalloy.

关键词： Inco.el 783 superalloy β phase rupture plasticity

Effect of substrate grain size on GA streaky marks of IF steel

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Baosteel technical Research 2014年第1期8卷 15-19页

作者： LIU Xin JIN Xinyan LU Yong Research Institute Baoshan Iron &Steel Co.Ltd. co.d Rolling Plant Baoshan Iron &Steel Co.Ltd.

The micro-characteristics of the streaky marks and the co.responding substrate surface of galvannealed （GA） steel sheets have been investigated using SEM and *** streaky mark area seems to have many cavities,similar to craters,which scatter light and make the surface appear darker when co.pared with the surrounding normal ***,it is found that the irregularity or difference in steel grain size tends to affect the surface quality of the GA steel *** alloying,the diffusion speed of Zn-Fe on the grain boundary is faster than that at the center of the grain,which results in the selective formation of crater-like morphology in the co.ting area with larger steel *** to the clear grain boundary of IF steel,apparent streaky marks will be formed on the co.ting,if the IF steel surface co.sists of grains of irregular size.

关键词： IF steel galvannealed steel streaky mark surface grain

Dynamic Deco.pling for co.bined Shape and Gauge co.trol System in Wide Strip Rolling Process

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Journal of iron and steel Research International 2008年第2期15卷 28-31页

作者： LINGHU Ke-zhi HE An-rui YANG Quan ZHAO Lin GUO Xiao-bo Shougang Research Institute of Technology Beijing 100041 China National Engineering Research center for Advanced Rolling University of Science and Technology Beijing Beijlng 100083 China New steel co.Ltd Anshan Iron and Steel Company Anshan 114001 Liaoning China

The precision of profile and thickness is the most important target for wide strip rolling,but the co.pling of profile co.trol and thickness co.trol is ignored in rolling schedule,which holds down the simultaneous quality improvement of profile and thickness.A cross-co.pled process co.trol model for co.bined shape and gauge co.trol was developed on the basis of the fact that both co.trols for profile and thickness are realized by co.trolling the rolling gap.A dynamic deco.pling co.troller was then proposed to deco.ple the *** the simulation results and the online production data are valid and ensure the quality of the deco.pling co.troller.

关键词： wide strip rolling profile co.trol thickness co.trol dynamic deco.pling

Deformation Mechanism of Bimodal Structured 2205 Duplex Stainless steel in Two Yield Stages

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Journal of wuhan University of Technology(Materials Science) 2023年第1期38卷 184-191页

作者：盛捷 DU Mingchen LI Yufeng MA Guocai CHEN Weiqian ZHENG Yuehong ZHAN Faqi REN Junqiang G I Raab 喇培清 State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of TechnologyLanzhou 730050China Jiuquan iron and steel(Group)co. Ltd.Jiayuguan 735100China Key Laboratory of Solar Power System Engineering Jiuquan Vocational and Technical CollegeJiuquan 735000China Institute of Physics of Advanced Materials Ufa State Aviation Technical University12 K.Marx StreetUfa 450008Russia

A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction *** analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%,*** present,the research on microstructure of bimodal 2205 DSS at room temperature(RT)mainly depended on scanning electron microsco.e(SEM)observation after loading *** test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile *** microstructure of duplex bimodal structured stainless steel co.sists of two pairs of soft hard regions and *** studying deformation mechanism of bimodal structured stainless steel,the interaction between soft phase and hard phase are *** principle of co.position design and microstructure co.trol of typical duplex stainless steel is obtained,which provides an important research basis for designing of advanced duplex stainless steel.

关键词： 2205 duplex stainless steel bimodal structure in-situ tensile test deformation mechanism two different yield stages