Development of X65M Pipeline Steels with 31.75 mm Thickness
LIU Zhigang
Abstract：Based on design of the low carbon micro alloy, the X65M pipeline steel with 31.75 mm thickness was developed in Jinan Steel. By using clean steel metallurgy technology, two stage rolling and ACC laminar cooling process, the strength and high toughness of heavy gauge X65M pipeline steel were ensured. The steel has a mixture microstructure of acicular ferrite and bainite, the yield strength of the plate ranged from 470 MPa to 520 MPa, tensile strength of the plate ranged from 600 MPa to 700 MPa, the Rt0.5/Rm were 0.76-0.85; the Charpy impact energy at-60 ℃ were more than 290 J, the DWTT at-20 ℃ were more than 90%, the all performance indicators can meet the standard requirements. With the development of new manufacturing process, the thick X65M welded pipe had rich strength, higher low temperature toughness and better welding property.
Keywords：pipeline steelX65M steelthick specificationmetallographic structurelow temperature toughness
Publication Date：2016-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 11-14,17 )