| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT@ No.45 (November 2001) "Developed Machinery Maintenance Technology in Steelmaking Plant" ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Surface-modifying Technologies
by Thermal Spraying of Process Rolls in Steel
Production Process Midorikawa, S.; Yamada, T.; Nakazato, K. |
| Synopsis : Research and development of surface modification for process rolls have been carried out to improve the quality and productivity of steel strip sheets, as well as to prolong the span of service life of the rolls. To apply to bridle rolls that control strip tension in processing lines, thermal spray coating techniques of providing wear resistance, slip resistance and corrosion resistance have been developed. These coatings are WC-cermet coating, provided with roughness-control technology, and multi-coating, sprayed with WC-powder including undercoat with sealing technology. As for the conductor rolls that have conductive function at the plating section, self-fluxing alloy coating added with WC-cermet, which can prevent WC particles from peeling by the flattening of the particles, was developed. This WC self-fluxing alloy coating has excellent corrosion-resistance and wear-resistance. Through the investigation of Mn build-up mechanism to acquire ways to reduce and prevent the Mn build-up, thermally sprayed coating with eminent Mn build-up resistance has been developed for hearth rolls that convey steel strip sheets in a continuous annealing furnace. These activities have made the process rolls more reliable and their span of service-life longer. |
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