X80 pipeline steel with low-temperature toughness

The invention relates to the technical field of pipeline steel, in particular to X80 pipeline steel with low-temperature toughness. The X80 pipeline steel comprises the following chemical components: C, Mn, S, P, Si, Nb, Ti, Mo, Cu, Ni, Cr, and limiting elements including B, Ca, N and O, with the balance being iron and inevitable impurities. The X80 pipeline steel with the low-temperature toughness is obtained by subjecting a continuous casting billet of the pipeline steel to heating, rough rolling, finish rolling, rapid cooling and coiling. According to the invention, the chemical components of the pipeline steel are optimized, controlled rolling and controlled cooling processes are combined, fine grain strengthening effect is fully played, the low-temperature toughness of the X80 pipeline steel is greatly improved, and the application field of the X80 pipeline steel is widened. 本发明涉及管线钢技术领域，是一种具有低温韧性的X80管线钢，该具有低温韧性的X80管线钢，其化学成分包括C，Mn，S，P，Si，Nb，Ti，Mo，Cu，Ni，Cr，限制元素B，Ca，N，O，其余为铁和不可避免杂质，按照下述步骤得到：将管线钢连铸坯经过加热、粗轧、