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The development of High Speed Steel roll |
Creatime: 2016/9/15 18:54:46 |
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High-carbon high speed steel roll (referred to as high speed steel rolls) is the advent of the shortest, fastest growing and most widely prospects hot roll material. Since its inception in Japan in 1988, has been in hot roughing mill, hot strip finishing mill, cold strip mill, steel mill, steel rolling mill and wire rod mill to obtain a pan of the application.Typical high-speed steel roll metallurgical structure, consists of martensite (or bainite) hardness of the matrix heightening MC, M2C, M6C and M7C3 carbides and other types. There are also a research and application of high speed steel rolls in the report, the first in China Iron and Steel Research Institute developed the high speed steel rolls, and hot rolled narrow strip rolling mill and bar mill to obtain a good use of effects.Beijing Metallurgical Equipment Research Institute, Xi''an Jiaotong University, Henan University of Technology, Wuhan Iron and Steel Roll Xingtaiyagun factory plant and other units, and then also on the preparation of high-speed steel roll-depth research techniques, the successful development of high speed steel rolls for high-speed wire rod mill has been and rod mills. , Domestic use is also high carbon high speed steel rolls the solidification process, heat treatment, mechanical properties and wear resistance in-depth research. In order to improve the solidification of high speed steel rolls organizations to improve their mechanical properties, also studied the domestic high-speed steel rolls modification methods, significantly improved the organization of high speed steel rolls and performance. Baosteel as the vanguard of the domestic steel industry, first proposed the 80 mill in the 20th century, the use of 90''s roll, a new concept of roll selection, spared no expense to take the lead in buying from abroad, high-speed steel roll.At present, Baosteel 1580 mm hot strip rack unit F1 ~ Fs work roll has been used in all foreign high-speed steel rolls, steel strip in improving the quality and prolong life and improve the roll mill operating rates, the effect is very obvious. Handan Iron and Steel, Zhujiang Iron and Steel, Anshan Iron and Steel also introduced from abroad a part of high speed steel rolls, high speed steel rolls in the use, maintenance and grinding, etc., and accumulated valuable experience.High speed steel rolls by centrifugal casting major foreign (centrifugal foundry, referred to as (CF), the outer layer forming a continuous casting method (continuous pouring process for cladding, referred to as CPC) [52] and electroslag remelting (electroslag remelt, referred to as ESR) manufacturing, while the liquid metal electroslag welding method (ESSLM), hot isostatic pressing method (Hot Isothermal Pressure, referred to as the HIP), and Spray Forming method (OSPREY) are still improving and development. Fabrication of high speed steel with the CPC rolls, alloy design of the large degree of freedom, the roll can be rich in good wear resistance of hard VC and M2C (or M6C) and other carbides. Although the centrifugal casting method has overwhelming advantages in cost, but it exists in the solidification process of solid and liquid centrifugal separation. To avoid this from happening, need to limit its chemical composition.It is worth noting that manufactured by centrifugal casting of high-speed steel rolls, made with the CPC method compared to high speed steel rolls, the hot crack depth, but also easy to produce subtle fragmentation. The CPC method and equipment manufacturing complex high speed steel rolls, China still can not produce, and ESR roll manufacturing method of high energy consumption, only suitable for manufacturing cold roll. Centrifugal Casting roll equipment is simple and efficient, is to create high-speed steel roll the main method, but it is easy to produce segregation and cracks, the domestic has not yet been solved. Imported from abroad the price of high speed steel roll, therefore, the domestic high-speed steel roll slow progress in the promotion and application, and of the world''s largest producer of steel pole position does not match. In order to promote the use of high speed steel rolls, high speed steel roll-depth study of key technology in manufacturing will have very important significance, deserves the majority of research workers, the importance of roll. |
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