俄罗斯泰纳线输油管线工程用K60钢级直缝埋弧焊管的残余应力测试分析

以巨龙钢管有限公司生产的俄罗斯泰纳线输油管线工程用K60钢级直缝埋弧焊管为测试用管,采用切块法测试了直缝埋弧焊管扩径前后的残余应力变化,并对钢管残余应力的分布特征及扩径对残余应力的改善效果进行了分析。测试分析表明：钢管扩径前存在较大的残余应力,扩径对消除钢管残余应力效果明显。     

俄将建第二条φ1420mm直缝埋弧焊管生产线

2004年1月俄罗斯北方钢公司和俄罗斯欧亚集团控股公司与世界著名的钢管生产设备供应商——德国SMSMeer公司签署了购买Φ1420mm直缝埋弧焊管机成套设备的合同。据悉,这条大口径直缝埋弧焊管生产线将建在距圣彼得堡不远的伊若尔斯克钢管厂内,设计年产Φ1420mm管长为18m的直缝埋弧焊管45万t。预计,该Φ1420mm直缝埋弧焊管生产线将在2005年年底投产。俄将建第二条Φ1420mm直缝埋弧焊管生产线$攀钢集团成都钢铁有限责任公司@杜厚益     

宝山钢铁股份有限公司钢管条钢事业部顺利完成加拿大COMCO项目定尺UOE直缝埋弧焊管供货

正2014年7月,宝山钢铁股份有限公司钢管条钢事业部(简称宝钢股份钢管事业部)圆满完成了加拿大COMCO项目总计9 146 tΦ711.2 mm×19.05 mm×18.3 mm UOE直缝埋弧焊管的发运任务。这是宝钢股份钢管事业部UOE生产线自2008年投产以来首次实现极限长度全定尺直缝埋弧焊管供货,填补了国内空白,打破了国际垄断,为UOE直缝埋弧焊管产品开拓海外市场提供了新的支撑。     

埋弧焊管静水压爆破试验统计分析

简要介绍了静水压爆破试验原理与方法,并对近两年完成的螺旋缝埋弧焊管和直缝埋弧焊管静水压爆破试验数据进行了统计分析。结果表明:静水压爆破试验测得的钢管实际屈服强度、抗拉强度和屈强比均高于拉伸试验测得的结果;采用拉伸试验结果来表征钢管屈服强度,并以此为依据进行管道设计和安全性评价,具有足够的安全余量(约11%),管道的安全性较高。     

X80钢级直缝埋弧焊管的研制

根据西气东输冀宁联络线天然气管线工程的需要,巨龙钢管有限公司对X80钢级直缝埋弧焊接钢管(Φ1016mm×18.4mm)进行了试制。详细介绍了此种焊管的试制过程和检验结果。检验结果表明,研制开发的X80钢级直缝埋弧焊管各项技术指标均符合标准要求。     

JCO成型过程中钢板的变形规律研究

直缝埋弧焊管JCOE生产线的关键工艺之一是折弯成型工艺。对钢板在折弯成型过程中的变形规律进行了详细的分析,发现在直缝埋弧焊管成型后钢板的中性层内移,导致钢管周长增加、壁厚变薄;并对测量数据进行分析,验证了有关理论。通过此项研究,有利于合理设定直缝埋弧焊管成型参数和确定原料钢板的宽度,对提高钢管质量和减少材料的损耗有重要意义。     

石油、天然气输送的双缝埋弧焊管及生产方法

<正>石油、天然气输送的双缝埋弧焊管及生产方法,应用于双缝埋弧焊管生产。特征是:采用宽度为钢管周长1/2的两块钢板,利用双面埋弧焊方法首先进行两块钢板沿纵向边拼接,然后采取常用的直缝埋弧焊钢管生产工艺进行钢管制作;另一     

焊接材料对X70直缝埋弧焊管焊缝组织性能的影响

针对因钢板原料的化学成分发生较大变化,使得原焊材与母材出现焊接不匹配,造成X70钢级管线钢直缝埋弧焊管焊缝的低温冲击韧性不合格的现象,采取两种焊丝进行焊接试验,通过观察和检测焊缝显微组织、力学性能,研究焊接材料对X70钢级直缝埋弧焊管焊缝组织性能的影响。试验结果表明:在采用相同的焊接工艺参数焊接同批次同规格钢管时,选用Mn、Si、Cr、Ti含量较高的焊丝进行焊接,焊管焊缝中先共析铁素体和针状铁素体晶粒更为细小,低温冲击数值较高,韧性较好。     

海底用-29℃低温抗酸直缝埋弧焊管研制

分析了国内某钢厂生产的X65MOS级钢板和所制的Φ762 mm×22.2 mm直缝埋弧焊钢管的力学性能、化学成分及显微组织等,研究了用于国外某海底低温抗酸的X65MOS钢级Φ762 mm×22.2 mm直缝埋弧焊钢管及钢板理化性能,从而系统地掌握了X65MOS钢级Φ762 mm×22.2 mm直缝埋弧焊钢管的制造能力。结果表明,所研制的直缝埋弧焊管各项性能指标均达到国外某海底低温抗酸X65MOS钢级Φ762 mm×22.2 mm钢管的技术要求。同时,母材和焊缝经抗氢致开裂试验后试样均无裂纹;焊缝经抗硫化物应力腐蚀试验后试样没有裂纹,表明钢管具有良好的耐硫化氢腐蚀性能。     

我国焊管业的现状及发展方向

介绍了"九五"以来我国焊管工业取得的重大进展;分析了我国焊管工业发展中存在的问题,指出应加快技术进步,转变单纯依靠数量的增长方式;提出了我国直缝电阻焊管、螺旋埋弧焊管和直缝埋弧焊管落实建设钢管强国的宏伟目标和加快技术进步及实现焊管业又好又快发展的具体措施。     

埋弧焊焊丝MK65HGX-Ⅲ的开发和应用

介绍了用于焊接深海天然气输送用直缝埋弧焊管的焊丝MK65HGX-Ⅲ的开发背景及研制过程。采用该焊丝和优化的H08DG焊丝与高碱度烧结焊剂SJ102G匹配焊接11.525万tX65钢级厚壁管线管,其低温韧性、断裂韧性和焊接接头的横向拉伸性能均符合标准要求,且性能稳定,富余量较大。实际生产证明:MK65HGX-Ⅲ焊丝是一种高性能的新型埋弧焊焊丝,所焊接的钢管焊缝具有高强度、高韧性和高塑性,适用于大线能量(约65kJ/cm)的焊接,可推广应用到更高钢级(X80)和抗H2S腐蚀要求的焊管焊接。     

Effect of Mn,Ni, Mo Contents on Microstructure Transition and Low Temperature Toughness of Weld Metal for K65 Hot Bending PipeEI北大核心CSCD

To increase transport efficiency and to lower the costs of pipeline construction, longitudinally submerged arc welded (LSAW) pipes with larger diameters and thicker walls have been increasingly used by the pipeline industry. For example, in Russia, the LSAW pipeline in the Bovanenkovo-Ukhta project was recently constructed with K65 steel (the highest grade of the Russian natural gas pipeline), which is similar in specifications and yield strength requirement (550 MPa grade) to API X80 but has a stricter low temperature toughness value of 60 J at -40 degrees C (compared to - 20 degrees C for API X80 grade) due to the extreme Arctic environment. Although weld metal with acicular ferrite (AF) has been developed to meet the requirement of low temperature toughness, the main objective of the present work was to clarify the microstructural evolution and the resulting changes in mechanical properties after the bending process. Hot bending pipes are necessary links in the construction of pipeline lying, which make more stringent standards for the strength and low temperature toughness. That puts forward a challenge especially to the weld bead because of the deterioration of toughness during the hot bending process. In this work, submerged arc welding wire with high strength and toughness was developed for K65 hot bending pipes, and the alloying elements of Mn, Ni, Mo were considered to estimate the microstructure evolution and the effect of low temperature toughness for the weld metal. The results showed the low temperature toughness at -40 degrees C reached 90 similar to 185 J and 65 similar to 124 J for weld metal of straight seam pipe and hot bending pipe respectively, which reflect the excellent role of alloying elements of Mn, Ni, Mo. Microstructure characterization revealed that the weld metal, which originally consisted mainly of AF in the as-deposited condition, became predominantly composed of bainitic ferrite (BF) after hot bending. In addition, the large size cementite along the grain boundary was also the reason for the deterioration of toughness. It is found that reaustenisation caused a small austenite grain-sized matrix, which brought about a very high volume fraction of bainite. However, the low temperature toughness for hot bending pipe was improved to 124 J for the weld metal with 0.2% Mo, in which about 67.1% of high angle grain boundary were found. It is clear that the process of reaustenitisation during the bending process plays an important role in successful microstructural design for the steel weld metals.     

Effect of welding technology on the mechanical properties of welded joints in pipes for deep water offshore gas pipelines

Results of investigations into the dependence of mechanical properties of welded joints of pipes for offshore pipelines on welding conditions are presented. In particular, the results show that the mechanical properties of pipes of the strength categories K60 (X70) and K56 (X65) are influenced mainly by the heat input, the fracture toughness of welded joints, and pipes of a high strength category are lower by 30–35% than in the case of the K56 (X65) pipes. The hardness of the weld metal in the upper layers is 15–17% higher for automatic submerged arc welding and in the lower layers for gas-shielded automatic arc welding. In inspecting the mechanical properties of the welded joints, special attention must be given to the longitudinal welded joints in the pipes.     

西气东输二线管道工程用X80钢级Φ1219mm直缝埋弧焊管的研发

介绍了西气东输二线管道工程用X80钢级Φ1219mm直缝埋弧焊管的研发情况。主要分析研究了X80钢级Φ1219mm直缝埋弧焊管的JCO成型、焊接、机械扩径、超声波自动探伤等技术;X80钢的理化性能试验结果;X80钢制管前后的拉伸性能、夏比冲击韧性、DWTT性能变化;X80钢级钢板夏比冲击韧性与温度的关系、屈强比的合理确定。批量生产证明,此种钢管的各项性能指标均满足标准要求,产品实物质量达到国际先进水平,填补了国内外空白,可显著降低生产成本。     

焊接方法对T92钢焊接接头韧性的影响

通过冲击试验、断口扫描和金相组织观察,研究了GTAW和GTAW/SMAW两种焊接方法对T92钢焊接接头韧性的影响。结果表明,焊接方法对HAZ的韧性影响不大,但对焊缝的韧性有很大的影响;奥氏体晶粒粗大及奥氏体柱状晶都能够降低焊缝的韧性,并提出了改善焊缝韧性的途径。     

母材成分对DP590钢电阻点焊接头性能的影响

通过对两种强度相近、母材化学成分不同的DP590双相钢电阻点焊接头的强度、断口及熔核TEM分析,揭示了母材化学成分对双相钢点焊接头强韧性的影响规律及机理.结果表明,母材碳含量越高,接头正拉强度及韧性越差,其主要机理是,在电阻点焊不平衡的急速冷却条件下,随着母材碳含量的增加,在点焊熔核及熔合区形成了板条状或片状的孪晶马氏体亚结构,从而降低了接头的韧性.     

再生钻杆摩擦焊接头断口形貌与断裂应变的研究

通过对再生钻杆摩擦焊接头断口形貌的电子金相分析,指出了正常断口和异常断口的客观特征。并采用统计平均法测定了两种断口形貌断裂表面上夹杂物的有效体积分数,从断裂应变的角度深入分析了异常断口断裂面上大量外来夹杂物对接头塑性和韧性的影响。     

高强TRIP钢焊接工艺及冲击韧性

通过对TRIP980钢进行二氧化碳激光焊接实验制定出适于TRIP980钢的焊接工艺参数,并对焊缝区域进行了冲击试验,通过SEM观察了焊缝区断口形貌。研究表明：TRIP980钢母材冲击断口形貌表现为韧性断裂,焊缝冲击断口形貌表现为脆性断裂,与原始材料相比,激光焊接后焊缝冲击韧性下降,主要原因是焊缝熔融区存在大量马氏体组织。     

螺母凸焊焊点断口形貌分析

分析常规螺母材料10B21与H260PD+Z镀锌钢板凸焊焊点的断裂方式。对工件进行破坏性试验,通过SEM观察焊点的断口形貌,结合焊点内部金相组织,发现螺母凸焊焊点的断裂方式分为两种:当断裂发生在熔合区时,断裂为脆性断裂;当断裂发生在板材的热影响区时,为韧性断裂和脆性断裂的混合断裂方式。结合理论分析和实际生产发现,当断裂发生在板材的热影响区时,断口具有一定的韧性,这样的断裂方式对螺母凸焊更为安全。     

9Ni钢T&T焊接工艺低温韧性

依据AWS D1.1M-2010,ISO 15653:2010对液化天然气(LNG)低温储罐钢9Ni钢TOP-TIG(T&T)焊接接头进行了夏比冲击韧性试验和断裂韧性(CTOD)试验. 另外对接头进行组织、XRD及断口分析,研究了9Ni钢T&T焊接接头低温韧性性能. 结果表明,T&T焊接接头冲击吸收功远高于标准要求,冲击韧性很好;热影响区组织主要为板条马氏体,位错密度高,断口韧窝浅而小,呈准解理断裂,焊缝区CTOD值较高,组织主要为奥氏体树枝状结构和等轴晶,断口含有大量韧窝,断裂韧性好. 9Ni钢T&T焊接接头-196 ℃低温韧性好,可以满足相关工程标准的要求.