管道长度对9%Cr热强钢管道焊后热处理温度场的影响  

Effect of Pipe Length on Temperature Field of 9%Cr Heat Resistant Steel Pipes during Post Weld Heat Treatment

作　　者：韩宇 王学[1] 霍国良[1] 周梵 HAN Yu;WANG Xue;HUO Guoliang;ZHOU Fan(School of Power and Mechanics,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热加工工艺》2020年第7期123-127,132,共6页Hot Working Technology

基　　金：国家自然科学基金面上项目(51574181)。

摘　　要：对4种规格9%Cr热强钢管道进行了局部焊后热处理试验,并利用ABAQUS软件建立了9%Cr热强钢管道局部焊后热处理温度场计算模型。根据实测和计算结果分析了管道长度变化对热处理温度场的影响,最后提出了焊接工艺评定时最小管道长度的计算方法。结果表明,随着管道长度的增加,热处理内外壁温差先迅速增大,之后增幅逐渐减缓,最后趋于一个稳定值。鉴于管道长度影响焊后热处理温度场和焊接工艺评定结果,对于热处理要求较高的9%Cr热强钢,为使工艺评定更接近实际工程中长管道的安装情况,建议工艺评定时最小管道长度根据所提出的与管径和壁厚有关的计算公式选取。Local post weld heat treatment(PWHT) experiment was carried out for four groups of 9% Cr heat resistant steel pipes. And local PWHT temperature field calculation model of 9%Cr heat resistant steel pipe was established by using ABAQUS. Based on measured and calculated results, the influence of pipe length on temperature field during local PWHT was analyzed. The calculation method selecting minimum pipe length was put forward for welding procedure qualification.The results show that the temperature difference between inner and outer wall increases rapidly at first, then slows down gradually, and finally tends to be stable with the pipe length increasing. In view of the effect of pipe length on temperature field during local PWHT and welding procedure qualification result for 9% Cr heat resistant steel which has higher heat treatment requirement, in order to make the process evaluation closer to the installation of long pipelines in practical engineering, it’s recommended that minimum pipe length during welding procedure qualification should be selected according to the proposed calculation formula related to pipe diameter and wall thickness.

关 键 词：9%Cr热强钢 焊后热处理 温度场 管道长度 

分 类 号：TG441.8[金属学及工艺—焊接] TG457.6