After years of development, domestic roll manufacturing enterprises can produce all kinds of rolls with different materials, specifications and varieties to meet the needs of all kinds of mills in China. 
         For example, SINOSTEEL has developed more than 50 kinds of roll products instead of imported ones. Its large-scale composite cast steel backup rolls, semi-high-speed steel rolls and centrifugal composite rolls have reached the world advanced level. In addition, TISCO's joint venture with Arcos, Yizhong's joint venture with Erle, and Baosteel's joint venture with Hitachi have accelerated the progress and development of roll manufacturing technology in China while introducing foreign capital and technology.
      However, although the roll manufacturing industry in China has been expanding its capacity and improving its technology, it has not kept pace with the technological progress and structural optimization of the Iron and steel industry. Low-end product overproduction, high- end product production capacity is obviously insufficient, such as high-speed steel, semi- high-speed steel roll, at present only a few domestic enterprises such as China Steel Xing

machine have batch production capacity, market share is low; Due to the special specifications of the new and proposed 5-meter wide and heavy plate mills in China, the extra-large work rolls and back-up rolls are completely dependent on imports. In order to solve the problem of equipping modern rolling mills with high-performance Rolls, it is necessary to enhance the capability of independent innovation and speed up the progress of science and technology and the development of new products.
      After years of research and exploration, domestic cast iron rolls have been made of conventional materials such as chilled cast iron, infinitely chilled cast iron and chilled nodular cast iron, at present, new roll materials, such as pearlite ductile iron, acicular structure ductile iron, high NI-CR infinite hard cast iron and high CR cast iron, have been

developed. In order to meet the needs of different rolling mills, the properties of rolls made of various materials are being refined and optimized, such as high NI-CR infinite cold hard rolls for wide and heavy plate rolling mills, Steckel Rolling Mills and Hot Strip Rolling Mills, it is suitable for rough rolling of hot strip mill, high chromium cast iron work roll

in front of Finish Rolling, high chromium iron work roll in wide and heavy plate mill and high chromium iron work roll in skin pass mill. At the same time of the optimization of roll varieties with different materials, the product performance is also developing to a higher level.
     The roll manufacturing enterprises in our country have formed the seriation of roll materials according to different types of rolling mills and Application Environments Through Independent R & D and Technology Introduction, which is close to the advanced level of foreign countries in the aspect of high alloy materials, the rollers of different materials used in plate and Strip hot rolling mill are basically connected with foreign advanced horizontal rail. For example, the hot strip vertical roll used for side pressure rolling and the centrifugal high chromium steel combination vertical roll rolled on the Baosteel 1580 rolling line are twice as effective as the alloy semi-steel. The two-roll reversible roughing roller, which is at the front of the hot strip mill and hot strip mill, has a long contact time with the high-temperature steel billet and bears large bending and torque due to the lack of supporting rollers, so it must have high resistance to hot cracking, biting and strength. In view of these characteristics, in recent years, domestic roll enterprises have developed integrated casting and composite casting tool steel roughing rolls, and the product performance has been greatly improved, the semi-high-speed steel and high-speed steel rolls for cold-rolled Strip have been successfully developed by Xingji Company of China Iron and Steel Corporation, which indicates that the manufacturing level of the cold-rolled roll has reached the world advanced level. With the appearance of New Roll and the increase of modern

rolling mill, the average consumption of rolls per ton of steel is decreasing. With the development of technology in iron and steel industry and the further research and application of new roll materials in roll manufacturing industry, roll consumption will be further reduced. Roll equipment, roll casting, roll knife