The main links of cold roll manufacturing process include smelting, forging, heat treatment, processing and inspection.

　　In the process of work, the cold roll must bear a lot of rolling stress. In addition, the welding seam, inclusion, edge crack and other problems of the rolled piece are easy to cause instantaneous high temperature, which makes the working roll subject to strong thermal shock, causing cracks, sticking, peeling and even scrapping. Therefore, the cold roll should have the ability to resist the cracking and peeling caused by bending stress, torsion stress and shear stress, as well as high wear resistance, high contact fatigue strength, high fracture toughness and thermal impact strength. Therefore, how to improve the service life of the roller has been a major problem facing the roller manufacturing industry.

　　The nondestructive testing of roll is usually carried out by ultrasonic flaw detector. In the cold roll flaw detection standard, the roll body is usually divided into surface area, center area and middle area according to the stress condition, and then the critical size of the allowable defects in each area is specified according to the fracture mechanics principle. The flaw detection workers should have the knowledge of roll manufacturing to judge the nature of the defects. At the same time, they should also have the knowledge of roll use, so as to estimate whether these defects may cause service damage under the specific use conditions.

　　Jiangyin runnaite Cold Roll Manufacturing Co., Ltd. is specialized in producing all kinds of cold-rolled work rolls, cold rolls, roll factory, back-up rolls, roll manufacturing, mainly supplies to Jiangsu, Hebei, Beijing, Zhejiang, Guangdong and other provinces and regions, and self exports to Malaysia, Taiwan, Nigeria and other countries. And established a set of scientific and standardized production management system, with 2 services as the guide, product quality as the life, continuous improvement of self, support the development of products and markets with high-tech content. The customer's satisfaction is our eternal goal.