Abstract: The compound-slab (/mm) 415 x 1 630 x2 570 for compound-rolling is got by removing the scale of awaiting compound-rolling faces of double (/mm)210 x 1 630 x 2 570 Q345B steel casting slabs, cutting circle welding V and welding together. By vacuum-pumping compound-slab cave, packing and heating to 1 220 ~ 1 260 °C the compound-slab is rolling at 1 150 °C to 100 mm supper heavy plate with total reduction more than40% in preceding three passes, and finishing rolling at 980 T. Examination results show that all mechanical properties of Q345 steel compound plate meet the requirements of GB6396-2008 and GB1591-2008, that is its tensile strength 530 -535 MPa, yield strength 325 MPa, elongation 27. 5% ~28.0%, thickness Z direction tensile strength 520 ~530 MPa and reduction of area 30.0% ~ 60. 5%. The ratio of bonding interface of compound-plate is more than 99%, and the tensile specimen fracture is mixing fracture and a small amount of toughness fracture with nice cold-bending performance.

摘要： 去除两块规格为(/mm)210×1 630×2 570的Q345B钢连铸坯待复合面上氧化铁皮,开环周坡口,叠放并焊接在一起得到(/mm)415×1 630×2570的复合坯。对复合腔抽真空、密封、加热至1 220~1 260℃和在1 150℃轧制成100 mm特厚板,前3道次总压下率大于40%,终轧980℃。检验结果表明,Q345B钢复合板各项力学性能均达到GB6396-2008和GB1591-2008的要求,抗拉强度530~535 MPa,屈服强度325 MPa,伸长率27.5%~28.0%,厚度Z方向抗拉强度为520~530 MPa,断面收缩率30.0%~60.5%,界面组织结合率99%以上,拉伸试样断口为混合断裂和少量韧性断裂,冷弯性能良好。