Crown refers to the slight, intentional curvature or convexity across the width of a rolled steel strip or sheet. This phenomenon occurs during the rolling process due to the deformation of the work rolls under the high pressure involved. The crown is crucial for ensuring the steel strip maintains uniform thickness and flatness during subsequent processing and use cases. Proper control of the crown is essential to prevent issues such as edge wave or center buckle, which can affect the steel's quality and usability.