本发明公开一种低温管线用超宽高韧性热轧厚板及其生产方法。钢中含有，C：0 .030％～0 .055％、Si ：0 .16％～0 .30％、Mn ：1 .45％～1 .70％、N b：0 .04％～0 .07％、Ti ：0 .012％～0 .025％、Cr：0 .20％～0 .40％、Mo≤0 .14％、Ni≤0 .20％、Cu≤0 .15％、Al≤0 .030％、P≤0 .010％、S≤0 .0 0 1 5％ 、O ：0 .0 0 0 5％～0 .0 0 2 0％ 、N ：0 .001％～0 .004％、Ca：0 .0010％～0 .0045％、Ca/S≥1 .8，( Mo+Ni+Cr+Cu )：0 .30％～0 .60％，其余为Fe和不可避免的杂质。粗轧开轧温度1080～1130℃，终轧温度980～1030℃，精轧开轧温度为820～860℃，精轧终轧温度为740～760℃，冷却速度8～15℃/s，热矫速度0 .7～1 .2m/s。成品钢板厚度≥21mm、宽度>4300mm，具有优良的低温韧性。

The invention discloses a super wide and high toughness hot rolled thick plate for low temperature pipeline and a production method thereof. Steel contains, C: 0.030% ~ 0.055%, Si: 0.16% ~ 0.30%, Mn: 1.45% ~ 1.70%, N B: 0.04% ~ 0.07%, Ti: 0.012% ~ 0.025%, Cr: 0. 20% ~ 0. 40%, Mo≤0. 14%, Ni≤0. 20%, Cu≤0. 15%, Al≤0. 030%, P≤0. 0.001% ~ 0.004%, Ca: 0.0010% ~ 0.0045%, Ca/S≥ 1.8, (Mo+Ni+Cr+Cu) : 0.30% ~ 0.60%, the rest is Fe and inevitable impurities. Rough rolling temperature is 1080 ~ 1130℃, finish rolling temperature is 980 ~ 1030℃, finish rolling temperature is 820 ~ 860℃, finish rolling temperature is 740 ~ 760℃, cooling rate is 8 ~ 15℃/s, hot setting rate is 0.7 ~ 1.2m /s. The thickness of the finished steel plate is more than 21mm, the width is more than 4300mm, the steel plate has excellent low temperature toughness.