X. O. Huang, R. J. Wang, T. J. Zhang, C. Zhang, J. L. Cheng, Surface Engineering Research Institute of CAAMS, Beijing, PRC, Beijing, China; Y. M. Li, G. Bi, Y. G. Zhang, X. H. Tan, Shanghai Baosteel Equipment Maintenance Co., Ltd, Shanghai, PRC, Shanghai, China
The most of metallurgy facilities service under the severe circumstances of high temperature, high loading and high abrasion etc. Hearth rolls, as the key parts of Continuing Anneal Line (CAL), can be actively reacted with the oxide on the surface of high speed moved band steels or with the residual iron powder on the surface of band steels at high temperature and under deoxidization atmosphere, which can grow up when band steels sliding on the surfaces of hearth rolls and will result in build-up occurring on the surface of rolls and dents appearing on the surface of band steels, that will make effect on the quality of band steels. Many practices of domestic and oversea well-known iron & steel companies indicate that applying a specially designed thermal sprayed coating on the surface of the hearth rolls can obviously reduce build-up on the surface of hearth rolls, prolong their service life and also greatly improve the surface quality of band as well as reduce the cost of production. This paper presents the developed simulating tester for charactering of build-up for hearth rolls. It can be used in lab for simulating the state of hearth rolls in different sections of CAL, further researching the mechanism of build-up, designing and optimizing the coatings build-up resistance at CAL lines. It can also be used for rapid developing of coating materials, predicting the service life of hearth rolls and reducing the cost and the risk of in-situ testing in product line.
Summary: The most of metallurgy facilities service under the severe circumstances of high temperature, high loading and high abrasion etc. Hearth rolls, as the key parts of Continuing Anneal Line (CAL), can be actively reacted with the oxide on the surface of high speed moved band steels or with the residual iron powder on the surface of band steels at high temperature and under deoxidization atmosphere, which can grow up when band steels sliding on the surfaces of hearth rolls and will result in build-up occurring on the surface of rolls and dents appearing on the surface of band steels, that will make effect on the quality of band steels.
Many practices of domestic and oversea well-known iron & steel companies indicate that applying a specially designed thermal sprayed coating on the surface of the hearth rolls can obviously reduce build-up on the surface of hearth rolls, prolong their service life and also greatly improve the surface quality of band as well as reduce the cost of production.
This paper presents the developed simulating tester for charactering of build-up for hearth rolls. It can be used in lab for simulating the state of hearth rolls in different sections of CAL, further researching the mechanism of build-up, designing and optimizing the coatings build-up resistance at CAL lines. It can also be used for rapid developing of coating materials, predicting the service life of hearth rolls and reducing the cost and the risk of in-situ testing in product line.
