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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Strength and Bauschinger Effect in TMCP Line Pipe Steels
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Strength and Bauschinger Effect in TMCP Line Pipe Steels

机译：TMCP管线钢的强度和鲍辛格效应

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摘要

Loss of strength in TMCP microalloyed low carbon linepipe steels with ferrite-pearlite microstructure due to Bauschinger effect (up to 70-80MPa of yield stress reduction) has been studied. Mechanical behavior of the steels has been investigated using tests of full-section flattened specimens taken from both 15,7 or 18,7mm plates and 1420mm spiral welded pipe with specified minimum yield stress of 461 MPa. The dependence of the microstructure and yielding behavior on position in wall section has been studied using sub-size 3 mm thickness specimens machined from sub-surface and central parts. Change of tensile curves of surface and internal layers during forming, flattening and protective polymer coating have been studied using sub-size samples subjected to three or four-point bending, flattening and annealing. The studies have revealed strong dependence of properties on test methods and the difference in yielding can be decreased significantly by low temperature annealing.
机译：已经研究了由于Bauschinger效应（高达70-80MPa）的TMCP微合金化低碳线管钢中具有铁氧体 - 珠光体微观结构的强度（高达70-80MPa）。研究了钢的机械行为，使用了从15,7或18,7mm板和1420mm螺旋焊管所取的全段扁平标本的测试进行了测试，其中最小屈服应力为461MPa。使用从子表面和中心部分加工的子尺寸3mm厚度样本研究了微观结构和产量对壁部分位置的依赖性。研究了在形成，扁平化和保护聚合物涂层期间表面和内层的拉伸曲线的变化已经使用了三个或四点弯曲，平坦和退火的子尺寸样本研究。研究表明，在试验方法上的性能强烈依赖性，通过低温退火可以显着降低屈服差异。

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