65Nb(65Cr4W3Mo2VNb)钢是华中工学院与大冶钢厂研制的新型高强韧性冷变形模具钢。我们在华中工学院金属材料教研室的协助下,用于制造我厂当时使用寿命最短的圆环凹凸模。生产实践证明,65Nb 钢不仅是优良的冷变形模具用钢,而且也是优良的冷冲裁模具用钢。圆环是汽车里程表上的零件,外圆φ9.8mm,内孔φ6.5mm,厚2.5mm,形状如一只 65Nb (65Cr4W3Mo2VNb) steel is a new type of high strength and toughness cold-deformed die steel developed by Huazhong University of Science and Technology and Daye Steel. With the help of the Metal Materials Department of Huazhong Institute of Technology, we used to manufacture circular punch and die with the shortest service life at that time. Production practice has proved that 65Nb steel is not only excellent cold deformation mold steel, but also excellent cold stamping die steel. Ring is a car odometer on the part, the outer diameter φ9.8mm, bore φ6.5mm, thickness 2.5mm, the shape of a