Abstract: After welding on all sides of cleaned two 300 mm x 2 000 mm x 4 000 mm casting slabs to 585 ~ 595 mm stock in vacuum chamber, and heating at 1 200 ℃ , the 300 ~ 410 mm clad heavy plate of steel SM45 (/% ：0. 42 ~ 0. 48C, 0.17 ~0. 37Si, 0. 50 ~ 0. 80Mn, ≤0. 030P, ≤0. 035S) is rolled with beginning rolling at > 1100 ℃,rolling speed 1. 0 ~1. 2 m/s and pass reduction more than 45 mm , after rolling the clad plate is slow-cooling for 48 h. The degree of combination and mechanical properties of clad plate is examined by ultrasonic inspection, structure analysis, cold bending, tensile , impact and hardness test. Results show that the metallographic structure of clad steel plate is ferrite and pearlite, the combination of steel plate is nice and there is no obvious defect; the tensile strength of clad steel plate is 600 ~675 MPa, and the tensile strength of specimen at Z direction of clad interface is 612 ~ 661 MPa.

Key words: Steel SM45, 300 ~ 410 mm Clad Steel Plate, Structure, Combined Property, Clad Interface

摘要： 将经过清理的两块300mm×2 000 mm×4 000 mm连铸坯在真空室将坯料四周焊合成585~595 mm坯料,经1 200℃加热,并在>1 100℃开轧,轧制速度1.0~1.2 m/s,道次压下量大于45 mm,轧成300~410 mm厚SM45钢（/%:0.42~0.48C，0.17~0.37Si，0.50~0.80Mn，≤0.030P，≤0.035S）复合板,轧后缓冷48 h。采用探伤、组织、冷弯、拉伸、冲击及硬度等方法检验复合钢板结合度及力学性能。结果表明,复合钢板的金相组织为铁素体和珠光体,钢板结合度良好,没有明显缺陷存在;钢板的抗拉强度为600~675 MPa,复合界面Z向试样的抗拉强度为612~661 MPa。

关键词: SM45钢, 300~410 mm复合钢板, 组织, 结合性能, 复合界面