中文摘要：

采用超低碳和低Cr、Mo、Ni等的经济型成分设计,研究了控轧、冷却和终冷温度等工艺参数对超高强钢显微组织和力学性能的影响规律。在实验室条件下,可获得抗拉强度1 000 MPa以上,-40℃冲击值148～236J超高强韧性钢板,显微组织以细小的超低碳贝氏体板条为主。富含高密位错和亚结构的上/下贝氏体、较多残余奥氏体薄膜、细小弥散M/A组织和第二相粒子,这对于超高强钢韧、塑性的提高起到关键的作用。在某宽厚板生产线首次实现了1 000～1 200 MPa级高韧性工程机械钢板的工业化生产,并成功应用于矿山机械关键构件的制造。

英文摘要：

The effects of controlled rolling and controlled cooling technology on microstructural and mechanical properties of an ultra-high strength steels with ultra-low carbon and lower Cr, Mo, Ni alloy added were investigated. The high strength steel plate containing of fine low carbon bainite lath can be obtained in laboratory, whose tensile strength reaches above 1 000 MPa and impact absorbing energy 150-250 J at --40℃. It is demonstrated that, up per/lower bainite composed of high density dislocations and substructure, more retained austenite film, fine and dispersed M/A and second particles are most important for high toughness and strength. The high toughness 1 000- 1 200 MPa plates were first industrially produced and used in mineral machine successfully.