本发明公开超宽特厚高韧性X80直缝焊管用钢及其生产方法。钢中含有,C:0.035 % ~0.055%、Si:0.12%~0.22%、Mn:1.60%~1.75%、P≤0.010%、S≤0.0015%、Nb:0.06%~0.10%、Ti:0.008%~0.020%、Ni:0.10%~0.24%、Mo:0.15%~0 .24%、Cr≤0.25%、(Ni+M o + C r) :0.40% ~ 0.65% 、A l :0.0 1 0% ~0.030%、N:0.0010%~0.0040%、Ca:0.0015%~0.0045%、Ca/S≥1.8,余量为铁和不可避免的杂质。铸坯加热温度1200~1230℃,均热温度1180~1210℃;粗轧开轧温度1100~1140℃,精轧开轧温度810~840℃,开冷温度730~760℃。成品钢板厚度≥31mm、宽度≥4330mm,低温韧性良好。
The invention discloses super wide, extra thick and high toughness X80 straight seam welding pipe steel and a production method thereof.C :0.035 % ~0.055%、Si:0.12%~0.22%、Mn:1.60%~1.75%、P≤0.010%、S≤0.0015%、Nb:0.06%~0.10%、Ti:0.008%~0.020%、Ni:0.10%~0.24%、Mo:0.15%~0.24%、Cr≤0.25%、(Ni+M o + C r) :0.40% ~ 0.65% 、A l :0.010% ~0.030%、N:0.0010%~0.0040%、Ca:0.0015%~0.0045%、Ca/S≥1.8, allowance for iron and unavoidable impurities. Casting billet heating temperature is 1200 ~ 1230℃, soaking temperature is 1180 ~ 1210℃; Rough rolling opening temperature is 1100 ~ 1140℃, finishing rolling opening temperature is 810 ~ 840℃, cold opening temperature is 730 ~ 760℃. The thickness of the finished steel plate is more than 31mm, the width is more than 4330mm, the steel plate has good low temperature toughness.