关键词: L485M管线钢, 拉伸性能, 织构, 各向异性

Abstract: Yield strength and tensile strength of L485M pipeline steel hot-rolled coil in four different directions (longitudinal, 30°, 45°, transverse) were tested by a Z1200 material tensile testing machine. Then the texture at different positions and in different directions of the coil thickness was detected and analyzed by an X' Pert Pro MRD X-ray diffractometer. The results show that the anisotropy of strength index of the steel is obvious, and the order of the strength is that transverse > longitudinal > 45°> 30°, and the transverse strength is obviously higher than that of the other three directions. The texture detection results of the steel show obvious consistency with the tensile properties, the main texture of longitudinal, 30° and 45° is {112}<111>, {001} <110>. Theoretically, the transverse and longitudinal crystallographic planes are the same, the difference of crystallographic directions is 90°, that is to say, the transverse texture is mainly {112} <110>, {001} <112>, so its properties are obviously different from that of other directions.

Key words: L485M pipeline steel, tensile properties, texture, anisotropy