中厚壁鋼管三輥軋制內(nèi)裂原因分析

Investigation of Causes of Medium Wall Steel Tube Internal Cracking Occurring in Three-roll Rolling Process

摘要: 在三輥軋管機上采用不同的變形量進行軋制對比實驗,分析了三輥軋制過程中產(chǎn)生的切向、軸向剪切應(yīng)力及塑性彎曲變形時產(chǎn)生的切向、軸向拉應(yīng)力對內(nèi)裂的影響。實驗結(jié)果表明:在其他工藝條件相同時,三輥軋制的變形量超過一定值時,鋼管內(nèi)表面金屬破裂。針對中厚壁鋼管內(nèi)表面縱裂紋形成的主要原因,提出了解決措施。

Abstract: With the comparative test rolling operations of the three-roll pipe mill with different deformation amounts, the elements responsible for the internal cracking of the material are analyzed, including the tangential and axial shearing stresses produced during the three-roll rolling process and the tangential and axial tensile stresses produced during plastic bending deformation process. The experiment result shows that with all the other process conditions remaining unchanged, when the deformation amount by the three-roll rolling exceeds a certain value, the internal metal cracking on the inner surface of the tube takes place. Following the main causes of the longitudinal cracking on the inner surface of the medium-wall steel tube, relevant actions are proposed.