本发明公开超宽厚壁X80级管线用热轧钢板及其生产方法。钢中含有，C：0.03％～0.05％、Si：0.16％～0.28％、Mn：1.50％～1.75％、Nb：0.05％～0.08％、Ti：0.012％～0.025％、Cr：0.10％～0.25％、V：0.01％～0.04％、Mo≤0.1 9％、Ni≤0.20％ 、Cu≤0.14％、Al≤0.020％、P≤0.013％、S≤0.0015％、O：0.0005％～0.0020％、N：0.001％～0.004％、Ca：0.0010％ ～0.0045％且满足Ca/S≥1.6，Mo+Ni+Cr+Cu：0.40％～0.65％，余量为铁和不可避免的杂质；粗轧开轧温度1070～1150℃，精轧开轧温度820～860℃，终轧温度760～780℃，冷却温度730～770℃，钢板宽度＞4000mm，厚度>25mm，低温韧性良好、屈强比低。

The invention discloses hot rolled steel plate for super wide and thick wall X80 grade pipeline and a production method thereof. In steel, C: 0.03% ~ 0.05%, Si: 0.16% ~ 0.28%, Mn: 1.50% ~ 1.75%, Nb: 0.05% ~ 0.08%, Ti: 0.012% ~ 0.025%, Cr: 0.10% ~ 0.25%, V: 0.01% ~ 0.04%, Mo≤0.19%, Ni≤0.20%, Cu≤0.14%, Al≤0.020%, P≤0.013%, S≤0.0015%, O: 0.0005% ~ 0.0020%, N: 0.001% ~ 0.004%, Ca: 0.0010% ~ 0.0045% and Ca/S≥1.6, Mo+Ni+Cr+Cu: 0.40% ~ 0.65%, residual iron and unavoidable impurities. Rough rolling opening temperature is 1070 ~ 1150℃, finish rolling opening temperature is 820 ~ 860℃, finishing rolling temperature is 760 ~ 780℃, cooling temperature is 730 ~ 770℃, the width of the steel plate is more than 4000mm, the thickness is more than 25mm, the steel plate has excellent low temperature toughness and low yield ratio.