With the development of nondestructive testing (NDT) technology for wire ropes, various detection methods are constantly refined and improved. The primary and representative NDT methods are suitable for the detection of wire ropes including manual inspection, acoustic emission method,acoustic-ultrasonic method,eddy current method,electromagnetic method and metal magnetic memory method. Meanwhile, the research results of our laboratory based on the theory of the magnetic flux leakage to detect wire rope’s fault detection will be displayed. Through comparisons of methods’ merits and weaknesses,it also has brought forward the new trends about adopting metal magnetic memory to predict the lifetime of the steel wire ropes,which has greater value in theory and application for improving the precise detection of the in-service ropes.

The cooling nozzles arrangement is an important factor that affects the uniformity of the work roll temperature during hot rolling. In order to improve the work roll temperature distribution, a 2D calculation model of the unsteady temperature field of the work roll was established and the cooling nozzles arrangement was optimized based on the ANSYS finite element software. And it could be found that the temperature differences between the middle and the edge of the work roll would be reduced 7~8°C when the cooling water crowns of the work roll on F1~F7 stands were increased. Two optimization methods were adopted, one way was: the nozzle spacings of each row were the same. By changing the flow of the nozzles, the nozzles were in gradient arrangement from the middle to the edge of the roll according to the flow. The other way was: the nozzle type and flow rate of each row were the same. By changing the nozzle spacings, the nozzles were arranged from the middle to the edge of the roll according to the nozzle spacings.