首页|Development and microstructure characterization of BG110E high-strength expansion pipe
Development and microstructure characterization of BG110E high-strength expansion pipe
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The BG110E high-strength expansion pipe was developed using medium manganese steel and subjected to a two-phase zone heat treatment process.Mechanical properties and microstructure analysis results have proven that the BG110E expansion pipe exhibits uniform elongation of more than 19％.Moreover,after undergoing expan-sion deformation,its strength,toughness,and plasticity are found to meet the stringent requirements of the P110 pipe.The microstructure of this high-strength expansion pipe,which has a strength of 110 ksi (1 ksi=6.895 MPa), consists of tempered martensite,ferrite,retained austenite,and granular bainite.The propotion of retained austenite reaches up to 12％,ensuring high plasticity and the occurrence of the transformation-induced plasticity effect during the deformation process.Consequently,it enhances the coordinated deformation ability between different phases, which significantly improves the internal yield pressure of the BG110E high-strength expansion pipe in turn.
retained austenitetwo-phase zone heat treatmentmedium manganese steel
DONG Xiaoming、ZHANG Zhonghua、GAO Zhan
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Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China
State Key Laboratory of Oil and Gas Equipment,Shanghai 201999,China
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