MANUFACTURING METHOD OF LINE PIPE THICK STEEL PLATE WITH EXCELLENT TOUGHNESS AND LINE PIPE THICK STEEL PLATE WITH EXCELLENT TOUGHNESS MANUFACTURED THEREOF

摘要

The present invention relates to a manufacturing method of a line pipe thick steel plate with excellent toughness and a line pipe thick steel plate with excellent toughness manufactured thereof, wherein the manufacturing method is able for a steel plate of which low temperature toughness is significantly improved greater than 85% of a DWTT shear fracture percentage at a temperature lower than -0C in a low intensity steel plate of which yield strength is less than 500 MPa in addition to a high intensity steel plate of which yield strength is greater than 500 MPa.;COPYRIGHT KIPO 2017