Imprinting of Dull Roll Surface Texture to Carbon Steel Strips in Temper Rolling by Dry Condition.pdfVIP

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Imprinting of Dull Roll Surface Texture to Carbon Steel Strips in Temper Rolling by Dry Condition.pdf

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Imprinting of Dull Roll Surface Texture to Carbon Steel Strips in Temper Rolling by Dry Condition

ISIJ International, Vol. 49 (2009), No. 4, pp. 539–545 1. Introduction The surface roughness of cold-rolled steel sheet is an im- portant quality item because the roughness greatly affects the press formability and image clarity after the coating of the steel sheet after the temper rolling process. Surface roughness is obtained by imprinting a dull roll surface tex- ture on a steel sheet surface. Although surface imprinting on the steel sheet surface is greatly affected by roll surface texture and rolling conditions, the mechanism of surface imprinting has not been clarified1–6) because of the com- plexity of elastic–plastic deformation of the rolled sheet in temper rolling. Surface conditions of roll and steel sheet are usually evaluated only by surface roughness i.e. Ra, how- ever it is not enough to explain the imprinting phenomenon. Therefore, surface imprinting is controlled, based on previ- ously obtained operational data and experiences in actual temper rolling mills. In the recent paper, we proposed that the use of water-soluble lubricant decreases roll micro-wear more than under dry condition (without using any lubri- cants). In this paper, the influences of roll surface texture on sur- face imprinting have been evaluated in temper rolling.7–14) Temper rolling experiments for as-annealed carbon steel strips have been performed using a 4-high rolling mill under dry condition. An electric-discharged dull roll and shot dull roll were employed as the work rolls. Surface tex- tures of the rolls were observed directly. Surface textures are evaluated in terms of the arithmetical mean deviation of the assessed profile (Ra) and material ratio (Rmr). 2. Experimental Procedure 2.1. Materials Both as-annealed high-carbon steel strips and as-an- nealed low-carbon steel strips were employed. The width and length of these steel strips are 50 mm and 250 m re- spectively. Figure 1 shows the relationship between true stress and true strain of the high-carbon and low-carbon s