我国抗大变形管线管的研制进展

摘要

In this article,it introduced strain based design,demand for high-deformability pipeline,the principle of material design and the development progress of China domestic high-deformability welded pipe.Adopting ferrite+bainite dual-phase structure to develop and mass produce X70 high-deformability welded pipe for China-Burma pipeline.It studied the performance requirements and the main properties change rule from steel plate to steel pipe before and after pipe manufacturing,as well as before and after aging,the developed welded pipes are with excellent properties.Based on this,it developed X80 high-deformability welded pipe used for the Third West to East Gas Pipeline Project,analyzed the problems and main difficulties occurred in development of X80 high-deformability material,that is the contradiction between hard phase increase caused by strength increase and adverse effect on uniform elongation of hard phase increase,and the process window was too narrow.Through experiments it determined the proportion demands of dual-phase structure,and utilizing effective measures to develop materials with excellent performance.All properties of thousand tons trial-manufacture steel pipes achieved the requirements of X80 high-deformability welded pipe in the Third West to East Gas Pipeline,which realized the development breakthrough in X80 thick-wall high-deformability welded pipe.%介绍了基于应变设计抗大变形管道的要求、材料设计原理以及我国抗大变形焊管研制的进展情况.采用铁素体+贝氏体双相组织思路研制开发并批量生产了中缅管线X70抗大变形焊管,对板材的组织性能要求及制管前后、时效前后的板-管主要性能变化规律进行了研究,研制的焊管具有优良的性能.在此基础上针对西气东输三线管道进行了X80抗大变形焊管的开发,分析了X80抗大变形材料研制中存在的问题及主要难点,即强度升高对双相组织中硬相比例增加的要求与硬相增加对均匀延伸率不利影响的矛盾,工艺窗口更窄.通过试验确定了双相组织比例要求,并采取了有效措施研制出了性能优良的材料,千吨级试制钢管各项性能指标均达到了西气东输三线X80抗大变形焊管的要求,实现了我国X80厚壁大变形焊管研制的突破.