COLD-ROLLED STEEL SHEET, PROCESS FOR PRODUCTION OF SAME, AND BACKLIGHT CHASSIS

摘要

A cold-rolled steel sheet having excellent workability and shape fixability, a process for production of same, and a backlight chassis are provided by appropriate control of minor components and ?-value.  A cold-rolled steel sheet which is characterized by containing C: 0.0010 to 0.0030%, Si: 0.05% or less, Mn: 0.1 to 0.3%, P: 0.05% or less, S: 0.02% or less, Al: 0.02 to 0.10%, N: 0.005% or less, and Nb: 0.010 to 0.030% with the balance being Fe and unavoidable impurities and which is characterized in that the ?-values in the longitudinal and crosswise directions are each 1.0 to 1.6 and that the mean (Elm) of elongations in the longitudinal direction, in the direction at 45° to the longitudinal direction and in the crosswise direction is 40% or above, with the proviso that Elm = (ElL + 2×ElD + ElC)/4 (wherein ElL: elongation in the longitudinal direction, ElD: elongation in the direction at 45° to the longitudinal direction, and ElC: elongation in the crosswise direction).