张力减径张力系数对无缝钢管壁厚不均的影响

Effect by Tension Coefficient of Stretch-reducing Mill on Wall Thickness Unevenness of Seamless Steel Tube

通过观察内孔形状及测量壁厚对无缝钢管壁厚精度情况进行研究;采用电子扫描显微镜对合金微观组织进行分析。结果表明:张力减径过程中采用大张力系数配合等壁或减壁方式进行轧制,可有效改善无缝钢管壁厚的均匀性,提高壁厚精度。采用大张力系数进行轧制的无缝钢管的组织呈现均匀分布的特征。

The W.T.accuracy status of the seamless steel tube is studied by means of observation of the bore shape,and measurement of the wall thickness.And the alloy microstructure is analyzed with the scanning electron microscope(SEM).The results show that the W.T.evenness of the seamless steel tube is improved by means of adjusting the tension coefficient of the stretch reducing process and rolling with the equi-wall or the reducing mode.The accuracy status of the W.T.of the seamless steel tube is studied via observing the bore shape of the pipe and measuring the W.T.of the pipe.And the alloy microstructure is analyzed with the scanning electron microscope(SEM).The results show that during the stretch reducing process,both the W.T.evenness and accuracy of the seamless steel tube can be improved by means of adopting big tension coefficient to match with rolling with the equi-wall or reducing mode.The alloy microstructure of the seamless steel tube as rolled with big tension coefficient features homogeneous distribution.