本发明属于钢铁制造技术领域，涉及一种大角度晶界特厚规格X80管线钢及其制造方法。一种大角度晶界特厚规格X80管线钢，按重量百分比计，由以下成分组成 ：C 0.04-0.07％ ，Mn 1.30-1.80％，Si 0.10-0.35％，Al 0.010-0.050％，Cu 0.22-0.45％，Ti 0.015-0.035％，Ni 0.20-0.40％，P≤0.010％，S≤0.0050％，N≤0.0060％，O≤0.0020％，Mo 0.20-0.50，余量为Fe及不可避免夹杂物。应用本发明的方法该技术提高了传统X80管线钢的卷曲温度，降低了厚度方向上的温度梯度，从而降低了晶粒度梯度，抑制心部出现粗大组织，保证了组织的均匀性。

The invention belongs to the technical field of steel manufacturing, and relates to a large-angle grain boundary ultra-thick X80 pipeline steel and a manufacturing method thereof. A kind of X80 pipeline steel with extra-thick specifications of large-angle grain boundary, calculated by weight percentage, composed of the following components: C 0.04-0.07%, Mn 1.30-1.80%, Si 0.10-0.35%, Al 0.010-0.050%, Cu 0.22- 0.45%, Ti 0.015-0.035%, Ni 0.20-0.40%, P≤0.010%, S≤0.0050%, N≤0.0060%, O≤0.0020%, Mo 0.20-0.50, the balance is Fe and unavoidable inclusions. By applying the method of the present invention, the technology increases the coiling temperature of the traditional X80 pipeline steel, reduces the temperature gradient in the thickness direction, thereby reduces the grain size gradient, suppresses the appearance of a coarse structure in the core, and ensures the uniformity of the structure.