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microstructures and mechanical Properties of X100 Pipeline Steel Strip

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Journal of Iron and Steel Research International 2014年第2期21卷 227-232页

作者： Lin-na DUAN Yu CHEN Qing-you LIU Shu-jun JIA Cheng-chang JIA School of material Science and Engineering University of Science and Technology Beijing Institute for Engineering Steel Central Iron and Steel Research Institute China Petroleum Engineering and Construction Corporation

Dynamic CCT （continuous cooling transformation） curves and effects of microstructures and m/a islands of X100 hot rolled strip on mechanical properties were studied by means of a thermal simulator, a scanning electron mi- croscope （SEm）, a transmission electron microscope （TEm）, a digital micro-hardness tester and Image-Pro Plus analysis software. The results show that high contents of C and mo can make transformation lines of acicular ferrite and bain- ite shift rightward. High mo tested strip has higher strength and micro-hardness and lower toughness than the other one because lath bainite appears instead of quasi-polygonal ferrite. Tested strip with granular bainite, lath bainite and m/a islands has better mechanical properties and in the microstructures lath bainite content is around 36.50% and m/a islands are fine and disperse in the matrix.

关键词： X100 hot rolled strip CCT curve granular bainite lath bainite m/a island

Weldability of 780 mPa Super-High Strength Heavy-Duty Truck Crossbeam Steel

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Journal of Iron and Steel Research International 2012年第6期19卷 64-69页

作者： WANG Xiao-nan DI Hong-shuang ZHANG Chit DU Lin-xiu DONG Xue-xir Shagang School of Iron and Steel Soochow University Suzhou 215021 Jiangsu China State KeyLaboratory of Rolling and Automation of Northeastern University Shenyang 110004 Liaoning China）

CO2-shielded welding experiments of newly developed, 780 mPa super-high strength heavy-duty truck crossbeam steel were conducted, and the microstructure, microhardness, mechanical properties, and impact tough- hess of the welded joint were studied. The evolution of the microstructure of the welded joint occurred as follows.. welding seam （acicular ferrite＋proeutectoid ferrite）→fusion zone （granular bainite-long strip m/a island）→coarse grain zone （granular bainite-long strip or short bar m/a island）→fine grain zone （ferrite＋ pearlite＋ blocky m/A is- land）→mixed grained zone （ferrite＋granular bainite＋blocky m/a island）→base metal （proeutectoid ferrite＋gran- ular bainite-hlocky or granular m/a island）. Increasing the density of the grain boundaries can effectively improve the impact toughness, and the blocky m/a island hindered crack propagation more effectively than the long strip m/a island. The new hot-rolled 780 mPa super-high strength steel had excellent weldability. The welding technology was applied under the following conditions： welding voltage was 20 to 21 V, welding current was 200 to 210 A, and the gas flow rate was 25 L/rain.

关键词： super-high strength steel crossbeam steel weldability m/a island impact toughness

Effect of Nb,mo and Ti on the microstructures and mechanical Properties of 700mPa Weathering Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 300-305页

作者： WANG Bing 1,SONG Yu-lai 2,WEN Xiao-ming 3,WANG Hou-xin 4,LIU Qing-you 1 (1.Institute for Structural materials of CISRI,Beijing 100081,China 2.Research and Development Center of Wuhan Iron and Steel (Group) Corp.,Wuhan 430080,Hubei,China 3.Benxi Iron and Steel Group Limited Company Benxi 117000,Liaoning,China 4.CITIC-CBmm microalloying Technology Center,Beijing 100081,China) Inst Struct mat CISRI Beijing 100081 Peoples R China Wuhan Iron & Steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China Benxi Iron & Steel Grp Ltd Co Benxi 117000 Liaoning Peoples R China CITIC CBmm microalloying Technol Ctr Beijing 100081 Peoples R China

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness,tensile test,cold-bend,the effect of Nb,mo and Ti on the structure and mechanical properties of 700mPa weathering steel was studied under the same rolling *** results show the formation of m/A is promoted by mo,while inhibited by ***,m/a island,as a hard phase,is harm to the material toughness and plasticity;high m/a island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700mPa steel must be higher than 0.05% to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,mo and *** industry trial production of 700mPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb mo Ti mechanical properties m/a island