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。     

Φ1 219mm×22mm X80钢级含Mo直缝埋弧焊管的开发

通过研制西气东输二线天然气管道工程用φ1219mm×22mm×80钢级含Mo直缝埋弧焊管．研究了X80钢级含Mo钢板的焊接性、热影响区的弱化,并对矩形和圆棒拉伸试样进行了对比试验分析。对φ1219mm×22mm×80钢级HTP与含Mo直缝埋弧焊管的主要性能进行了对比分析。提出了厚壁X80钢级管线钢管的拉伸试验应采用圆棒试样的建议。     

X80钢级高频焊接管线管的试制

通过优化HFW焊管机组成型参数、焊接参数和焊缝热处理工艺,成功试制出X80钢级管线管.首批试制的X80钢级管线管的各项性能满足API Spec 5L标准(44版)的要求,为后续拓展高频焊管钢级奠定了工艺基础.针对试制中出现的问题指出了需要改进的方向.     

X80M钢级Φ1422 mm×21.4 mm螺旋缝埋弧焊管性能

分析X80M钢级φ1 422 mm×21.4 mm螺旋缝埋弧焊管的化学成分、力学性能、组织结构和几何尺寸;研究了壁厚对X80M钢级焊管热影响区硬度的影响。分析认为：X80M钢级φ1 422 mm×21.4 mm焊管的合金元素范围比φ1 219 mm×18.4 mm焊管明显缩窄,力学性能相比Q/SYGD 0503.2有较大的富余量,韧性良好,残余应力较低,管端几何尺寸控制良好,但热影响区存在一定程度的软化。后续应关注壁厚增加带来的大壁厚焊管热影响区软化和焊接接头低强匹配等问题。     

焊材匹配与钢板合金成分对X80管线钢管低温韧性的影响

研究了不同焊材匹配对X80管线钢管焊缝低温(-45℃)冲击韧性的影响,优选出适用于低温直缝埋弧焊管焊接的焊材匹配方案;采用同种焊接工艺对两种不同合金体系的X80钢级管线钢管进行焊接,研究了不同合金成分对钢管DWTT性能、焊接热影响区低温冲击韧性的影响.研究结果表明:采用低S、P杂质的高碱度氟碱型烧结埋弧焊剂匹配Mn-M...     

X70钢级海洋用高应变直缝埋弧焊管的研制

研制了 X70钢级Φ559 mm×31.8 mm海洋用高应变直缝埋弧焊管.采用多边形铁素体+贝氏体双相组织高应变能力的钢板,结合预弯成型、扩径模具及工艺优化,并结合焊材匹配试验研究,单炉试制生产的X70钢级Φ559 mm×31.8 mm海洋用高应变直缝埋弧焊管均匀延伸率合格率偏低,应变硬化指数均未达到预期,需进一步分析...     

HTP与TMCP工艺X80钢级板材制管性能的对比分析

通过对低碳高铌不添加钼的Cr-Nb微合金钢高温轧制(HTP)、低碳Mo-Nb微合金化钢传统热机械轧制(TMCP)的两种钢板制管性能的对比分析,证实了采用HTP工艺技术生产的管线钢板完全能够制造出符合现行技术标准要求的X80钢级直缝埋弧焊管,而且生产成本大幅度降低,有助于提升管线管的竞争力。     

宝山钢铁股份有限公司UOE大口径直缝埋弧焊管通过生产许可证认证和X80钢级管线管评价

2008年7月，宝山钢铁股份有限公司UOE大口径直缝埋弧焊管生产实现了重大突破。由中国石油天然气集团公司管材研究所组织的专家对宝山钢铁股份有限公司UOE大口径直缝埋弧焊管生产现场和产品进行了认证，同时对X80钢级管线管也进行了评价。专家一致认为，宝山钢铁股份有限公司UOE大口径直缝埋弧焊管生产线符合管线管生产的要求，     

宝鸡石油钢管有限责任公司X80钢级Φ1219mm×22mm螺旋缝埋弧焊管通过第三方评价检测

正2014年7月15日,由宝鸡石油钢管有限责任公司(简称宝鸡钢管)试制的X80钢级Φ1 219 mm×22 mm螺旋缝埋弧焊管顺利通过了中国石油集团石油管工程技术研究院(简称钢管研究院)对产品性能、中国石油天然气管道科学研究院廊坊开发区中试基地对环焊缝的第三方检测评价试验。X80钢级Φ1 219 mm×22 mm螺旋缝埋弧焊管作为建设管线工程的主要产品之一,国内焊管生产企业已经陆续开展了对其的研制开发,但由于此种规格的螺旋缝埋弧焊管原料在国内尚属首次开发,为了确保产品在大壁厚下具备良好的力学性能     

X70钢级螺旋埋弧焊管的研制

根据涩北-西宁-兰州天然气管线工程的需要,华北石油钢管厂对X70钢级的螺旋埋弧焊管Φ660mm×10.3mm进行了研制,较详细地介绍了此种焊管的试制过程和检测结果。检测及实际应用情况表明,研制开发的X70钢级螺旋埋弧焊管各项技术质量指标均符合要求。     

均匀塑性变形X80管线钢的时效和退火工艺

从应变时效和退火处理入手,通过设置不同预应变量模拟管材出现均匀塑性变形而未发生颈缩,研究不同热处理方式对预应变X80管线钢性能的影响。研究发现未处理的X80管线钢的拉伸曲线具有连续屈服特征,没有明显的屈服平台,在均匀塑性变形阶段进行预拉伸后管材发生明显加工硬化,屈服强度最大增加值为148 MPa,管材的断后伸长率和形变硬化指数随着预应变量增大出现降低的现象;预应变管材经260 ℃时效处理后其拉伸曲线出现屈服平台,屈服强度继续升高,断后伸长率则持续降低,应变硬化性能未见明显变化;而预应变管材经660 ℃退火处理后其拉伸曲线出现明显屈服平台,屈服强度小于原始管材强度,屈强比、断后伸长率和形变硬化指数等性能参数得到明显改善。     

Effect of Strain Aging on Tensile Behavior and Properties of API X60, X70, and X80 Pipeline Steels

The effect of strain aging on tensile behavior and properties of API X60, X70, and X80 pipeline steels was investigated in this study. The API X60, X70, and X80 pipeline steels were fabricated by varying alloying elements and thermomechanical processing conditions. Although all the steels exhibited complex microstructure consisting of polygonal ferrite (PF), acicular ferrite, granular bainite (GB), bainitic ferrite (BF), and secondary phases, they had different fractions of microstructures depending on the alloying elements and thermomechanical processing conditions. The tensile test results revealed that yielding behavior steadily changed from continuous-type to discontinuous-type as aging temperature increases after 1% pre-strain. After pre-strain and thermal aging treatment in all the steels, the yield and tensile strengths, and yield ratio were increased, while the uniform elongation and work hardening exponent were decreased. In the case of the X80 steel, particularly, the decrease in uniform elongation was relatively small due to many mobile dislocations in PF, and the increase in yield ratio was the lowest because a large amount of harder microstructures such as GB, BF, and coarse secondary phases effectively enhanced work hardening.     

高铌X80管道不同强度匹配环焊接头性能及应变演化

为探究管道环焊缝断裂失效机理,测试了两种不同强度匹配的高铌X80环焊缝接头的组织和性能,并借助数字图像相关法(digital image correlation,DIC)观测了焊接接头在拉伸载荷下的应变行为.结果表明,低强匹配和高强匹配的高铌X80管道环焊接头均具有较好的冲击韧性,二者的夏比冲击吸收能量平均值相当,热影...     

快锻油压机高压管道的振动分析

针对80kN快锻压机管系振动问题,分析了压力管道振动原因,采用有限元方法,重点对高压管段进行了模态分析与谐响应分析;为避免管道结构共振,分析了增加管夹支承及改变支撑性质对管道振动频率、应力、应变的影响.同时考虑了存在预应力管道的模态分析,得出预应力的存在会使管道固有振动频率略微增加.通过对高压管道进行了流场分析与单向流固耦合作用下动力学分析,获得了管道中流体速度、压力的分布规律与应力、应变云图,得到管道动态力作用下的危险部位,分析结果对快锻压机管道结构设计具有一定理论与实践意义.     

Influence of Dual-Phase Microstructures on the Properties of High Strength Grade Line Pipes

The influence of dual-phase microstructures on mechanical properties of X70, X80, and X90 line pipes is investigated. It is found that the line pipes with dual-phase microstructures possess both larger uniform elongation and higher hardening exponent, especially for high grade steel X90. The tensile deformation of dual-phase line pipe does not follow the trend predicted by the Hollomon formula, and a stable strain-hardening exponent is not found. This stress-strain behavior is different from the normal line pipe. In the initial stage of plastic deformation, the strain-hardening capacity of dual-phase line pipe increases rapidly. However, it reaches a stable stage after 2.0% total strain. The dual-phase pipeline steel is composed of soft phase (polygonal ferrite) and hard phase (bainite), and thus the relatively soft ferrite is good for its deformability. Besides, the fraction of large angle grain boundaries in the dual-phase microstructures is greater than that of the normal line pipe, which is proven to be critical for improving the resistance to plastic deformation and crack propagation.     

Effects of C and Si on strain aging of strain-based API X60 pipeline steels

Four types of strain-based API X60 pipeline steels were fabricated by varying the C and Si contents, and the effects of C and Si on strain aging were investigated. The 0.05 wt% C steels consisted mainly of polygonal ferrite (PF), whereas the 0.08 wt% C steels consisted of acicular ferrite (AF). The volume fraction of AF increased with increasing C content because C is an austenite stabilizer element. The volume fractions of bainitic ferrite (BF) of the 0.15 wt% Si steels were higher than those of the 0.25 wt% Si steels, whereas the volume fractions of the secondary phases were lower. From the tensile properties before and after the aging process of the strainbased API X60 pipeline steels, the yield strength increased and the uniform and total elongation decreased, which is the strain aging effect. The strain aging effect in the strain-based API X60 pipeline steels was minimized when the volume fraction of AF was increased and secondary phases were distributed uniformly. On the other hand, an excessively high C content formed fine precipitates, and the strain aging effect occurred because of the interactions among dislocations and fine precipitates.     

钼对X80高铌管线钢焊接组织与性能的影响

用热模拟试验机研究了不同线能量的焊接热循环对两种X80高铌管线钢组织和性能的影响。结果表明,在X80高铌管线钢中添加钼元素,可以抑制焊接过程中先共析铁素体的形成,促进下贝氏体转变,钼能够更加有效地细化焊后晶粒尺寸,使得加钼钢获得优于高铌钢的韧性和显微硬度。     

焊接热循环对X80管线钢粗晶区组织性能的影响

采用焊接热模拟试验和冲击试验，研究了X80管线钢焊接热循环对粗晶区组织性能的影响。结果表明，当焊接热输入为20kJ／cm时，其热影响区粗晶区可获得最佳的韧性水平，其原因是产生了多位向分布的针状铁素体，它可作为X80管线钢埋弧焊的推荐焊接规范。在较高的焊接热输入下，X80管线钢的韧性降低，此时已开始出现对韧性构成损害的铁素体和珠光体。     

Φ1422 X80高钢级大口径长输管道用热煨弯管制造工艺

通过对φ1 422 mm、X80级弯管母管的成分设计、管体及焊缝的力学性能以及热加工性能的研究,对比试制多个工艺参数,优化必选合理的推制和热处理工艺参数,实现了弯管管体、焊缝力学性能和金相组织等性能匹配,试制出满足CDP-S-OGP-PL-016-2014-3《油气管道工程感应加热弯管通用技术条件》要求的φ1 422 mm×25.7 mm、X80大口径长输管道用热煨弯管样品,并通过了国家型式试验认证。