鞍钢建设大直径直缝埋弧焊管机组可行性探讨

大直径直缝焊管主要用于石油、天然气、水煤浆及各种液体的管道输送.鞍钢拥有丰富的宽厚板资源和优秀的技术人才,已具备了建设整套大直径直缝埋弧焊管机组的条件.对大直径直缝焊管的需求前景、主要生产工艺以及鞍钢建设大直径直缝埋弧焊管机组的可行性进行了探讨.     

中国冷弯型钢的市场前景和发展对策

本文叙述了冷弯型钢在石油化工、天然气、煤炭与建筑、家电、汽车、铁路等行业的市场前景很广阔,应当以创新为突破,提升企业的技术含量,加强行业内的全面协作、共同繁荣冷弯钢市场。     

冷弯型钢成型过程的实验研究

冷弯成型变形复杂,实验研究是冷弯成型研究中不可缺少的一部分,采用电阻应变片测量法和网格法对冷弯成型过程进行研究,并以直缝焊管为例,对带材的变形及弹复等进行综合测试,获得了许多有价值的实验数据,有助于工厂改进工艺,生产出高质量的产品。     

替代进口的大型UOE焊管预弯边模具技术被我联盟攻克

<正>由山东省四方技术开发有限公司和上海宝钢联合开发的国产新型UOE焊管用预弯边模具,经宝钢进口直缝埋弧焊钢管生产线巨型弯边机2 000多轧次测试表明,模具表面磨损均匀,整体表面未出现影响焊管产品质量、模具寿命的缺陷,无损探伤结果良好,宣告我国第一套自主设计制造的UOE焊管预弯边模具研制成功,这是"中国钢管和冷弯型钢工模具技术创新战略联盟"成立以来产学研用合作创新的又一个夺目成果。     

珠江钢管公司先进的焊管生产线

珠江钢管公司是中国最大的钢管生产、出口基地 ,直缝焊管年产能力可达 135万 t。同时也是世界最大的直缝焊管制造企业之一。该公司共有 3条直缝焊管生产线。1993年从美国引进具有先进水平的 ERW高频电阻焊管生产线 ,产品范围为 114～ 35 5 m m,壁厚 3.0～ 12 .7m m,材质可达 X70 ,年产量 15万 t,可按 API- 5 L 等国际标准和国家标准生产高效优质的石油、天然气等焊管产品。1998年该公司建成我国第一条大口径 L SAW直缝埋弧焊管生产线 ,焊管直径 40 6～ 180 0 m m,壁厚 6 .4～ 2 5 .4m m,单管单条直缝长度达 12 m,材质 X70 ,年产能…     

我国建设直缝埋弧焊管机组的前景

本文分别对国外油气输送管道发展趋势,国内油气输送管道生产现状及市场需求预测等方面情况进行了简要介绍,指出我国建设直缝埋弧焊管机组的必要性,紧迫性。建议集中力量打破行业界限,统筹规划,建设一套高起点的,具有世界先进水平的ＵＯＥ焊管机组,以产顶进,满足国内管道建设的需求增强国际市场的竞争力。     

太钢不锈增资天管太钢进军焊管

太钢不锈决定联合天津钢管向天管太钢增资5782．95万元,投资计划用于两方面,其中3000万元用于现有Ф340mmERW焊管生产线的流动资金,其余2782．95万元用于新建Ф180mmERW直缝焊管生产线。公司对天管太钢增资金额为2891．475万元。     

中俄天然气供应协议令焊管厂家受益

<正>中、俄签署了期盼已久、价值4 000亿美元的天然气供应协议,双方商定从2018年起,俄罗斯开始通过中俄天然气管道东线向中国供气,输气量逐年增长,最终达到每年380亿m3,累计30年。此协议将使中国焊管厂家受益,新建一条长3 060 km管道将拉动大口径焊管需求,新的管道主线可消费逾100万t管线管。中国将投资220亿美元,中国石油集团负责建设管道的中国段部分。在俄建     

冷弯型钢、焊管生产用高铬合金轧辊的研发

介绍了冷弯型钢和焊管生产用轧辊的状况及由山东省四方技术开发有限公司研发出的优于国际上第三代高铬材料的高铬合金新材料及特殊的热处理工艺、加工工艺及高铬合金轧辊的情况。     

中国焊管企业发展的关键在于结构调整

焊管行业是钢管行业的一个重要组成部份,而且与无缝管有关联,因此,焊管行业的问题要从整个行业的全局来看,也许看得更清楚一些。一、我国钢管行业的概况我国钢管行业在技术结构上由无缝管机组、直缝焊管机组［又分为高频直缝焊管（ERW）和大口径直缝埋弧焊管机组（LSAW）］以及螺旋焊管机组（SSAW）组成。其中无缝管产量稍低于焊管产量,而且焊管产量还在呈上升趋势,这是因为无缝管在某些领域逐步为焊管所替代。据不完全统计,无缝钢管约250多套机组,年产能力约450多万吨,直缝中小焊管机组（ERW）约1600～1800多套,年产能力约…     

Research status of corrosion environment failure and safety assessment of pipeline welded joint

Pipeline transportation is an economical,safe,and efficient transportation method for transporting oil,natural gas,mineral slurry,and other fluids.Welding is the most critical construction process in pipeline engineering and is crucial in the safe operation and service of an entire pipeline system.Theoretically,the girth welded joint is the weakest link in a pipeline system.The unevenness of the structure and performance of the joint caused by welding frequently results in the failure of the welded joint before the failure of the base material of the pipe body,causing the pipeline to leak or even break.For steel pipes used in an acidic corrosive medium environment,the integration of the corrosive medium and mechanical load will accelerate the failure of the welded joint.This article reviews the failure modes of pipeline welded joints in acidic corrosive media,including stress corrosion cracking,hydrogen-induced cracking,and corrosion fracture,and corrosion fatigue considering the diffusion and accumulation of H+at the crack tip.It also reviews service pipelines in acidic corrosive media.The general processing technology of pipe joint engineering critical assessment(ECA)is investigated to provide a reference for the future development of technology in this field.     

汽车排气系统用不锈钢及焊管制造技术

铁素体不锈钢具有良好的耐氧化性、低的热膨胀系数、高的抗腐蚀性能以及更为经济的成本,使得铁素体不锈钢更多地用于汽车排气系统零部件。欧美及日本汽车全部使用不锈钢材料特别是铁素体不锈钢用于排气系统零部件制造以满足汽车轻量化及严格的尾气排放要求。其中,汽车排气系统中60%以上零件为管件。介绍了汽车排气系统的构成、常用不锈钢品种及各部件的性能要求,并阐述了汽车用不锈钢焊管的主要焊接加工方式。     

试论中国钢管业的发展战略方向

中国钢管业目前已处在一个新的发展转折点和平衡点，从学术界涌现的观点或者思路来看，存在歧见：无缝管和焊管之间的发展关联问题，以及焊管中螺旋焊管和直缝焊管的发展方向问题，在这种大前提下，就细分为：发展什么品种、规格的问题，以及发展什么机型、流程以及流程优化的问题，等等。     

宝钢UOE机组的装备水平与工艺技术

为满足中国石油、天然气能源输送管道建设需要大量高等级钢管的需求,宝钢分公司钢管厂兴建了一套现代化的大口径直缝埋弧焊管机组(UOE).该机组广泛采用了当今先进的UOE制造技术:大步幅的预弯边机、UO成型大压缩率控制、O成型的钢管中心恒定控制、O成型机的两段式变径液压缸、快速工具更换装置、数值分析模型等.同时概括介绍了该机组的产品方案,生产工艺、装备的技术参数和特点,并对采用的最新的C,U,O成型技术进行了论述.     

焊接钢管高频感应加热的残余应力和组织演变

 随着中国钢铁、冶金与电磁等交叉学科的快速发展,焊接钢管产量及质量日益提升。高频感应加热是生产焊接钢管的核心工序,获取更加精确的焊管高频加热过程的应力分布和微观组织演化规律,是进一步提升焊管品质的关键要素和学者们关切的问题。综合考虑热传导和微观组织转变对应力的影响,针对高频焊管特有的沙漏形热源形貌,定量分析了焊接热影响区微观组织演变过程和残余应力的分布规律,获得了考虑热应力和组织应力的残余应力分布。发现该应力特点为在焊缝附近轴向残余应力较大,最大等效残余应力出现在距焊缝中心1/2壁厚处的热影响区,在壁厚方向管材内部的中间层的残余应力较大,且应力分布与反映高频焊接热源形貌特征的加热温度峰值和加热温度宽度相关。而在焊缝中心处,未考虑组织变化的等效残余应力值是考虑组织变化的1.3倍。掌握焊管高频焊接应力和组织演变的特点和规律,可为优化高频焊接工艺提供理论依据,对提升高频焊管质量具有重要意义。     

Development and application of Baosteel X80 large diameter UOE longitudinal submerged arc welded pipes

With the increase in energy demand,the demand for oil and gas transmission pipes,particularly high-grade longitudinal submerged arc welded pipes (LSAWs),have been growing in recent years.The construction of the 2nd West-East natural gas transmission pipeline project shows that the oil and gas pipeline construction has entered a new phase of development with X80 pipes being applied in large scales for the first time in China.This paper briefly introduces the 2nd West-East natural gas transmission pipeline project and its main technical requirements with the focus on the features of API standard 5L X80 grade  1219 mm series of U-ing-O-ing-Expanding (UOE) LSAW pipes,which Baosteel developed with the integrated technology for the 2nd West-East natural gas transmission pipeline project.The analysis shows the extra-low carbon content,the high contents of manganese and niobium,the fine microstructure,the high strength,the toughness and the good weldability of X80 pipes meet the requirements of "the technical specification of LSAW linepipes for the 2nd West-East natural gas transmission pipeline project in China".By the end of June 2010,Baosteel had totally produced 322000 t of  1219 mm X80 UOE steel pipes,which have been successfully used in the 2nd West-East natural gas transmission pipeline project,thus filling the gap of the production of large diameter X80 UOE LSAW pipes in China.     

Technology innovations on high quality special steel products

Because special steels are the basic materials for industrialization,a national R&D program on special steel technology for high quality products have been granted to promote the special steel production and applications since 2008.Since then,great progresses have been achieved on ferritic stainless steel sheets,heat resistance steel pipes and tubes,microalloyed forging steel bars,and mould steel forgings for hot working. The ratio of ferritic stainless steel sheets produced by TISCO and Baosteel has been promoted through technology innovations and increased 42%and 48 in 2009 respectively.439M steel sheets have been used to exhaust system,and 444 steel sheets have been applied to kitchen and architecture.The production technologies for heat resistance steel pipes and tubes(T/P92,S3043,S31042 steels) have been developed in Baosteel and Pansteel to meet the market requirements.Meanwhile,the round bloom technology has been initiated in Xingcheng Steel.The new technologies for microalloyed forging steels,low cost steel bar,and tailored steel and components,were proposed by CISRI based on the understanding of precise chemical composition and segregation control.And the applications of microalloyed forging steel bars have been promoted remarkably.The researchers have developed high quality mould steel technologies,heavy section forgings of 718 steel,high premium H13 steel blocks and large diameter mandrels used for seamless pipe rolling.The technology innovations of the program could lead to the progress of production technology in special steel sheets,pipes,bars and forgings,and meet the demands from market.For the moment,it is actually believed that there still strong requirements for the technology innovations on special steels.     

Steels for pipes and pipelines

The development of steel grade up to X 80 quality was shown explaining metallurgical mechanisms used for thermomechanically rolled steels with improved toughness behaviour. The influence of the reduction of C-content for these TM-steels on the field welding behaviour was discussed. The development of steels with improved resistance against sour media was presented, showing the influence of purity degree, Mn- and C-content in combination with the steelmaking practice. The influence of residual stress on the SSCC resistance of SAW pipe was pointed out and a heat treatment process was presented reducing the residual stress and resulting in crack free spiral welded pipes under the most severe test condition of NACE-solution with pH-values of 2.7–3.5.     

Strain analysis in advanced tool forming process with spline finite strip (SFS) method

Abstract

Roll forming is one of the important advanced metal forming processes. Simulation is an effective method to study the geometrical and the mechanical character of the strip deformation between the rolls. The spline finite strip method (SFSM) has been developed to simulate the cold forming process. The solution procedures of SFSM are given. The forming processes of four types of sections: electrical resistance welded pipe, channel section, channel section with outer edge and non-symmetrical channel section, were simulated by SFSM. The transverse membrane strain, longitudinal membrane strain and displacement of the deformed strip were obtained.