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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 741-747页

作者： Qing-yun Sha Da-hang Li Guo-jian Huang Ju Guan Technology Center Anshan Iron and Steel Group Company

A separation phenomenon occurring during the drop weight tear test of commercial thick-walled API （American Petroleum Institute） X80 strip steel was investigated in this work. Microstructural analysis showed that the band structure of bainite elongated along the rolling direction works as the initiation sites of separation. The propagation of separation can be promoted not only by the occurrence of the band structure of martensite/austenite constituent, prior austenite grain boundaries, and elongated bainite, but also by fine acicular ferrite and bainite. Wide separation formed in the former case, while the narrow one appeared in the latter case. acicular ferrite in thick-walled X80 pipeline steel in order Some methods were proposed to obtain fine and homogeneous to minimize the occurrence of separation.

关键词： pipeline steel drop weight tear test separation cracking band structure

Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels

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Journal of University of Science and Technology Beijing 2007年第5期14卷 410-413页

作者： Zhiping Zhao Zhenmin Wang Hongmei Zhang Lifeng Qiaol Angang steel Company Limited Anshan 114008 China Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China School of Material Science and Engineering University of Science and Technology Liaoning Anshan 114044 China

The effects of the deformation in the non-recrystallization region of austenite and the cooling rate on the transformation behavior and microstructure of low-carbon low-alloy steel for pipeline application were studied on the thermal-mechanical simulator Gleeble-1500. It was shown that an increase in deformation amount can greatly increase the nucleation site of ferrite when deformed in the non-recrystallization region of austenite, and an increase in nucleation ratio can greatly refine grains. When the cooling rate is accelerated, the driving force of nucleation is increased and the nucleation rate also improves. Ultra-refine grains can be obtained by controlled rolling. The high density of ferrite nucleus, which forms along the austenite grain boundary, twin interface, and deformation band are introduced in the matrix of austenite by the control of hot rolling, after which the microstructure can be refined. It was found that the acicular ferrite has a very fine sub-structure, high dislocation density, and a thin slab with ultra-fine grains. Small M/A islands and cementite are precipitated on the matrix of the slabs by the analysis technique of TEM and SEM.

关键词： pipeline steel acicular ferrite dislocation M/A island

Effect of Cyclic Loading on Cracking Behaviour of X-70 pipelinesteel in Near-Neutral pH Solutions

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Journal of Materials Science & Technology 2005年第4期21卷 459-464页

作者： Hao GUO Guangfu LI Xun CAI Ruipeng YANG Wu YANG College of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China Shanghai Research Institute of Materials Shanghai 200437 China

The cracking behaviour of X-70 pipeline steel in near-neutral pH solutions was studied under different modes of cyclic loading. The crack propagation process of X-70 pipeline steel under low frequency cyclic loading condition was controlled mainly by stress corrosion cracking （SCC） mechanism. Under mixed-mode cyclic loading, both higher tensile stress and shear stress made cracks easier to propagate. Applied cathodic potentials and high content of carbon dioxide in solutions also promoted the propagation of cracks. The propagation directions of cracks were different under different cyclic loading conditions. Under mode I （pure tensile stress） cyclic loading condition, cracks were straight and perpendicular to the tensile stress axis, while under mixed-mode 1/111 （tensile/shear stress） cyclic loading,cracks were sinuous and did not propagate in the direction perpendicular to the main tensile stress axis. Under the mixed-mode cyclic loading, cracks were much easier to propagate, suggesting that shear stress intensified the role of tensile stress. In addition, shear stress promoted the interaction between cracks, resulting in easier coalescence of cracks.

关键词： pipeline steel Stress corrosion cracking Near-neutral pH Cyclic loading Shear stress Propagation

Processing of Ultralow Carbon pipeline steels with Acicular Ferrite

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Journal of Materials Science & Technology 2004年第6期20卷 779-781页

作者： FurenXIAO MingchunZHAO YiyinSHAN BoLIAO KeYANG KeyLaboratoryofMetastableMaterialsScienceandTechnology YanshanUniversityQinhuangdao066004China InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China

Acicular ferrite microstructure was achieved for an ultralow carbon pipeline steel through the improved thermome chanical control process (TMCP), which was based on the transformation process of deformed austenite of steel. Compared with commercial pipeline steels, the experimental ultralow carbon pipeline steel possessed the satisfied strength and toughness behaviors under the current improved TMCP, although it contained only approximately 0.025% C, vvhich should mainly be attributed to the microstructural characteristics of acicular ferrite.

关键词： pipeline steel Transformation Acicular ferrite

Methanogenic archaea and sulfate reducing bacteria induce severe corrosion of steel pipelines after hydrostatic testing

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Journal of Materials Science & Technology 2020年第13期47卷 72-83页

作者： Enze Zhou Jianjun Wang Masoumeh Moradi Huabing Li Dake Xu Yuntian Lou Jinheng Luo Lifeng Li Yulei Wang Zhenguo Yang Fuhui Wang Jessica A.Smith Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China CNPC Tubular Goods Research Institute Xian 710065China CNPC pipeline Construction Administration Department Beijing 100101China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Department of Biomolecular Sciences Central Connecticut State UniversityNew BritainCT 06050USA

Complex interactions within a microbial consortium can induce severe corrosion in oil pipelines.This study investigated the mechanism of microbiologically influenced corrosion(MIC)that led to failure of X52 steel pipelines after hydrostatic testing.Laboratory hydrostatic testing with untreated lake water and underground water were used to simulate and study the events that led to the actual corrosion.Biofilm analysis,weight loss,and several electrochemical measurements demonstrated rapid corrosion rates after hydrostatic testing.Analysis of microbial community structures revealed that methanogenic archaea and sulfate reducing bacteria(SRB),introduced by the hydrotest water,formed corrosive biofilms on X52 steel coupon surfaces that induced severe pitting.

关键词： pipeline steel Microbiologically influenced corrosion Sulfate-reducing bacteria(SRB) Pitting corrosion

Strength, strain capacity and toughness of five dual-phase pipeline steels

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Journal of Iron and steel Research(International) 2021年第6期28卷 752-761页

作者： Yi Ren Xian-bo Shi Zhen-guo Yang Yi-yin Shan Wei Ye Gui-xi Cai Ke Yang State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The effect of microstructures on strength,strain capacity and low temperature toughness of a micro-alloyed pipeline steel was elucidated.Five various dual-phase microstructures,namely,acicular ferrite and a small amount of(around 2 vol.%)polygonal ferrite(AF+PF),polygonal ferrite and bainite(PF+B),polygonal ferrite and martensite/austenite islands(PF+M/A),polygonal ferrite and martensite(PF+M)and elongated polygonal ferrite and martensite(ePF+M),have been studied.Experimental results show that AF+PF microstructure has high yield strength and excellent low temperature toughness,whereas its yield ratio is the highest.Polygonal ferrite-based dual-phase steels,PF+B,PF+M/A and PF+M microstructures show better strain capacity and low temperature toughness.The strain capacity and low temperature toughness of ePF+M microstructure are the worst due to its high strength.The relationship between microstructure,strength,strain capacity and toughness has been established.Based on the results,the optimum microstructure for a better combination of strength,strain capacity and toughness is suggested to be the one having appropriate polygonal ferrite as second phase in an acicular ferrite matrix.

关键词： pipeline steel Dual-phase microstructure Strength Strain capacity Toughness

Development and future prospect of hot strip rolling technology at Baosteel

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Baosteel Technical Research 2008年第3期2卷 38-48页

作者： Huang Chuanqing Zhang Wenxue Hot Strip Rolling Plant Baosteel Branch Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200941 China

Since the 2050 mm hot strip mill was put into operation in 1989, Baosteel has made great achievements in increasing productivity, developing new process technologies and steel products and improving product quality. In the past 18 years from 1989 to 2007 ,Baosteel has constructed five hot strip mills with a total annual capacity of 19.8 Mt. Indices for technology standards, product categories and steel grades, product quality, both technically and economically, take the lead domestically or reached the world class level. As there are many hot strip mills that expected to be put into operation by the end of 2010 ,the overall annual capacity will exceed 30 Mt ,and the product will cover grain oriented （GO） Si steels and alloyed steels.

关键词： hot strip rolling pipeline steel 05 steel sheet tinned sheet container steel sheet Si steel

Application of a sintered flux in UOE pipe manufacturing

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Baosteel Technical Research 2013年第3期7卷 31-35页

作者： QIAN Weifang CAO Neng LIU Shuo WANG Huailong Welding and Corrosion Protection Department Research InstituteBaoshan Iron & Steel Co.Ltd.

Submerged arc welding is one of the main processes used in the manufacture of UOE welded pipes. It determines directly the quality of the pipes. In the submerged arc welding process, flux plays a very important role ;it not only affects the performance of the weld seam but also has a significant impact on the generation and prevention of weld defects. It is important to use a sintered flux for UOE pipe production. To meet the high-quality requirements on UOE welded pipes, the flux should be chosen such that it can resist high current and high speed, and help the weld achieve low H and O contents. At the same time, storage and management of a flux also require stringent monitoring. Domestic enterprises generally use sintered fluxes for the production of welded pipes.

关键词： multiple wire submerged-arc welding sintered flux UOE crack pipeline steel

Acicular Ferrite Microstructure of A Low-carbon Mn-Mo-Nb Microalloyed Pipe steel

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Acicular Ferrite Microstructure of A Low-carbon Mn-Mo-Nb Mic...