A light pattern of red oxide on the surface which is usually heavier on the top side of the steel as rolled. This is a form of rolled-in-scale and is caused by the steel being too hot after it has passed through the hydraulic sprays and the entry side of the finishing train. There being no means of removing this scale, it is rolled into the surface. Heat pattern difiers from rolled-in-scale only to the extent that it is much lighter.
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