煨制弯管成形及热处理工艺对L360Q钢组织和性能的影响

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Abstract：Thisarticle adopts the hotbending testmethod to systematicallanalyze the hardness，tensile properties， and Charpy impact strength of different parts of L36oQ seamless steel pipes through local induction heating bending and tempering heat treatment.The metalographic structure isobserved，and themechanical propertiesofL360Q steel beforeand after hotbending and heat treatment arecomparedand analyzed.Theexperimental results indicate that due to uneven temperature distribution during the heating process，there are differences in the deformation of various parts of the bent pipe，which in turn leads to diferences in microstructure and properties.The tensile strength of the transition zone of the bent pipe at the beginning of the arc is 588MPa ，and the yield strength is 520MPa which is significantly higher thanthe original base material （straight seamless steel pipe）and other parts of the bent pipe; In the vicinityof the starting and ending arc sections，the hardnessvalue is higher than that of other parts of the pipe body;Afterundergoing hotbending and temperingheat treatment，the metalelongationoftheoriginal base materialwilldecrease，buttheoverallchangeintoughnessisnotsignificant，indicatingthattheeffectofhotbending andtempering heat treatmentonthe toughnessof steel pipes is limited.The hot bendingand heat treatment process of this study mets therequirementsofGB/T9711—2023andSY/T 5257—2012 standards，providing technical reservesand references for the design ofL36oQpipeline bends.

Keywords：hot bending forming;heat treatment;microstructure;mechanical properties

1 序言

在当今工业化进程持续加快的大背景下，管道运输对于石油、天然气及电力等诸多行业的重要性愈发凸显，已成为支撑这些行业发展的关键力量。（剩余4384字）