‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.27 ( November 1992 ) Hot-Rolled, Cold-Rolled and Surface Coated Steel Sheets and Electronics and Instrumentation ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
Remodelling of Chiba No.2 Hot Strip Mill to Meet Higher Quality Requirements Ko Toyoshima, Masaki Aihara, Souichiro Onda, Hisao Takenaka, Masakazu Maeda, Junzo Nitta |
Synopsis : To meet the growing severe requirements noticeable recently for hot rolled strip in thickness, profile, quality and delivery, a series of advanced measures taken included the installation of a long-stroke work-roll shift in the finisher front stands, a hydraulic screw-down at F5 stand, and a strip steering control. All these led to a marked improvement in the crown control capacity through a tapered WRS (K-WRS) at front stands. This, combined with the existing WRS at the latter stands, established a superior hot rolling technology in profile, flatness and thickness accuracy. On the basis of these techniques, a direct hot charge rolling (DHCR) of slabs was established to shorten leadtime. Edge heater was installed to obtain uniformity of mechanical properties in the cross section of strip, and a hydraulic side guide was installed to obtain good coiling shape of hot strip. |
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