... free forging, die forging, material preparation, machining, and heat treatment. Shanghai ZENT Industrial Co., Ltd specializes ... , flaw detectors such as ultrasonic,magnetic and penetrance, Brinell hardness,Rockwell hardness,and Vickers hardnes systems.The main ... Marine machinary, Electric equipment, Petro-Chemical, Hydrautic machinery, and Mining machinery. General specifications of the products: the ...