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An Analysis on Application and Trend of Low-Alloy steel in Shipbuilding and Offshore Engineering Industry

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Journal of iron and steel research International 2011年第S1期18卷 827-830页

作者： LI Xin-xin,NA Rong-qing,MENG Zhao-chuang (Dalian Shipbuilding Industry Engineering and research institute,Dalian 116000,Liaoning,china) Dalian Shipbldg Ind Engn & res inst Dalian 116000 Liaoning Peoples R China

Since 2003,china shipbuilding industry has stepped into the orbit of fast *** this paper,a brief analysis has been made on application of low-alloy steel in the shipbuilding and offshore engineering industry,and the further requirements on the marine steel plates elaborated in combination with the future development trend in this ***,a reference approach is proposed for potential cooperation between the shipbuilding industry and steel industry.

关键词： low-alloy steel ship and offshore engineering

Effect of Heat Treatment on the Mechanical Properties and the Carbide Characteristics of a High Strength Low Alloy steel

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Journal of iron and steel research International 2011年第S1期18卷 143-147页

作者： ZHANG Wen-feng,HU Ping,ZHOU Qiang-guo,YAN Wei,SHAN Yi-yin,YANG Ke (institute of Metal research,Chinese Academy of Sciences,Shenyang 110000,Liaoning,china) Chinese Acad Sci Inst Met Res Shenyang 110000 Liaoning Peoples R China

Effect of heat treatment on the mechanical properties and the corresponding morphology changes of carbides such as (NbTi)C and Mo,Cr rich carbides in a high strength steel was studied in the *** was found that the strength depend more on tempering temperature than quenching *** the toughness seemed to be sensitive to both quenching temperature and tempering *** the as water quenched condition,the toughness gave a peak value at the quenching temperature of 860℃.Under the as tempered condition,the toughness showed a temper brittleness at the temperature range of 230℃ to 450℃.The morphology changes of the carbides in the experimental steel were explained from the view of the thermal dynamic behavior.

关键词： ultra high strength steel carbides heat treatment mechanical properties

Influencing Factors on Center Segregation in Continuously Cast Pipeline steel Slabs

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Journal of iron and steel research International 2011年第S2期18卷 352-357页

作者： LIU Yang1, WANG Xin-hua2, WANG Wen-jun1, JIANG Zhong-hang1 (1.Shougang research institute of Technology Beijing 100043 china 2.University of Science and Technology Beijing 100083, china) Shougang res inst Technol Beijing Beijing 100043 Peoples R China Univ Sci & Technol Beijing Beijing 100083 Peoples R China

The factors which influence center segregation of continuously cast slabs are obtained through analyzing the database of macrostructrue. It indicates that center segregation becomes severer with the increasing content of carbon, phosphorus and sulfur; Center segregation will be reduced obviously if the content of manganese is higher than 1.5% and the ratio of Mn/S is higher than 300; High degree of superheat , high casting speed and increasing width of slabs will increase the degree of center segregation. Since center segregation below class B has little effect on the property of steel, hence, in order to low the ratio of center segregation of class B-1.0 down to 10%, several control strategies are presented as follows: the contents of carbon, phosphorus and sulfur must be focalized in lower range of steel grade demanded, but manganese upper operating range control. The referenced contents of the elements in molten steel are required like this: [C]1.5%,[Mn]/[S]>300; The degree of superheat should be lower than 24℃ and the casting speed should be defined to 1.0-1.1 m·min-1. At the same time, proper secondary cooling system of water distribution should be developed and the precision of continuous caster should be also improved.

关键词： continuous casting slab, center segregation, microalloy steel

Variation of Non-Metallic Inclusions Composition in X80 Pipeline steel Refined by High Basicity Slag

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Journal of iron and steel research International 2011年第S1期18卷 563-566页

作者： LI Qiang 1,WANG Xin-hua 1,LI Hai-bo 2,HUANG Fu-xiang 1,YANG Jun 1,WANG Wan-jun 1 (1.School of Metallurgical and Ecological,University of Science and Technology Beijing,Beijing 100083,china 2.Shousteel research institute,Beijing 100039,china) Univ Sci & Technol Beijing Sch Met & Ecol Beijing 100083 Peoples R China Shousteel res inst Beijing 100039 Peoples R China

The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline *** amount of aluminum was added to experimental heats for final deoxidation during BOF tapping,and then the refining top slag with high basicity and strong reducibility was adopted to transform Al 2 O 3 to inclusions with low melting *** results show that the composition of inclusions changes in order of "Al 2 O 3 → MgO-Al 2 O 3 system→ CaO-MgO-Al 2 O 3 system→ CaO-Al 2 O 3 system".And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking,which are easily removable to obtain high cleanliness steel by collision,agglomeration and flotation.

关键词： transformation of inclusions high basicity top slag removal of inclusions X80 pipeline steel

Development of 340MPa Grade Galvanized Automotive HSLA Sheet of Shougang

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Journal of iron and steel research International 2011年第S1期18卷 990-993页

作者： QI Chun-yu 1,LIN Li-bin 2,ZHOU Jian 2,LIU Guang-ming 2,YIN Xian-dong 1 (1.Beijing Shougang Cold Rolling Company,Ltd.,Beijing 101304,china 2.Shougang research institute of Technology,Beijing 100041,china) Beijing Shougang Cold Rolling Co Ltd Beijing 101304 Peoples R China Shougang res inst Technol Beijing 100041 Peoples R China

In the paper,development of 340MPa galvanized grade HSLA sheet of Shougang is *** effects of annealing parameters on the precipitates,microstructures and mechanical properties were *** to the experiment,it was indicated that the fine microstructures and disperse carbide of Nb caused high strength of the *** now,the product has been used to the reinforced inner panel.

关键词： HSLA microstructure property precipitation galvanizing

Effect of Tempered Temperature on Microstructure and Properties of 150mm 610MPa Grade Ultra-Heavy Plates

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Journal of iron and steel research International 2011年第S1期18卷 633-636页

作者： WU Bin 1,JIN Ru 1,SUI He-long 1,JIANG Zhong-hang 1,WANG Quan-li 1,BAI Xue-jun 2 (1.The Technical research institute of Shougang,Beijing 100043,china 2.Qinhuangdao Shouqin Metal Materials Co LTD,Qinhuangdao 066326,Hebei,china) Tech res inst Shougang Beijing 100043 Peoples R China Qinhuangdao Shouqin Met Mat Co LTD Qinhuangdao 066326 Hebei Peoples R China

The 150mm 610MPa grade ultra-heavy plates was successfully exploited with 320mm casting slab,and the microstructure and mechanical properties was studied under different tempered *** plasticity and toughness are improved obviously in the 1/4 and 1/2 of 150mm ultra-heavy plates by controlling the amount and distributing pattern of ferrite,and the produced plates are successfully used in the construction of hydropower station of Murum in Malaysia.

关键词： 150mm temper strip ferrite

Microstructure and Deformation Mechanics of X100 Line Pipe steel

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Journal of iron and steel research International 2011年第S1期18卷 255-261页

作者： LI Yang 1,2,MENG Li 1,JI Ling-kang 2,LI He-lin 2 (1.School of Material Science and Egineering,University of Sceince and Technology Beijing,Beijing 100083,china 2.CNPC Tubular Goods research institute,Xi’an 710065,china) Univ Sci & Technol Beijing Sch Mat Sci & Egineering Beijing 100083 Peoples R China CNPC Tubular Goods res inst Xian 710065 Peoples R China

In present paper,microstructure is observed by means of OM,SEM,EBSD and TEM analysis on material obtained from X100 linepipe with wall thickness as 20.6mm and outside diameter as 1016mm diameter Grade *** study the deformation mechanics,microstructure transformation is also investigated on deformed specimens with different strain level as 0%,5% and 8%.results show that X100 line pipe material consists mainly of acicular ferrite whose ratio in material reaches 64%,obvious cellular structures formed by tangled dislocation and M/A island distributed in acicular plates indicate abundant dislocation and substructure existed in *** is measured that line pipe steel has a much finer effective grain size as 2.07μm,which can results in a higher strength and toughness for line pipe *** analysis for Kikuchi Pattern reveals that the ratio of large-angle boundary is comparatively higher as 55%,implying that line pipe steel has a good *** is observed that the proportion of small-angle grain boundary increases greatly after material deformed,which consequently results in the increment of dislocation and sub-structure.

关键词： X100 line pipe acicular Ferrite M/A grain boundary misorientation

Effect of the Small Reaustenized Grains on the Mechanical Properties of a HSLA steel

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Journal of iron and steel research International 2011年第S1期18卷 312-315页

作者： ZHAO Lian-yu 1,2,WEI Yan 1,SHAN Yi-yin 1,YANG Ke 1 (1.institute of Metal research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,china 2.Graduate School of Chinese Academy of Sciences,Beijing 100049,china) Chinese Acad Sci Inst Met Res Shenyang 110016 Liaoning Peoples R China Chinese Acad Sci Grad Sch Beijing 100049 Peoples R China

Grain refinement improves not only strength but also *** reaustenized grains were discovered to form along the grain boundaries and lath boundaries in an as rolled high-strength low-alloy (HSLA) steel when heated to double phase *** number and size of the small reaustenized grains were revealed to depend mainly on temperature in the range of 700 to 760℃.These small reaustenized grains were deduced to form by consuming *** mechanical property tests showed that they resulted in slight changes to tensile ***,the sample heated at 740℃ produced a peak Charpy V-notch (CVN) impact energy of 248J when tested at-30℃.Fractography showed that the facture surface of the 740℃ heated impact sample exhibited the smallest brittle zone away from the notch root and a large dimple zone lay ahead of the notch tip,which demonstrated the highest toughness.

关键词： high-strength low-alloy steel reaustenization grain refinement tensile property

Effect of Solute Drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed steels

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Journal of iron and steel research International 2011年第S1期18卷 383-387页

作者： FU Li-ming 1,WANG Huan-rong 2,WANG Wei 2,SHAN Ai-dang 1 (1.School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,china 2.Department of Structural steels,Baosteel research institute,Shanghai 201900,china) Shanghai Jiao Tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel res inst Dept Struct Steels Shanghai 201900 Peoples R China

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed *** analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p>0 and prespectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels