cold rolled strips

steel surface adhered to a layer of iron oxide, its color is mostly gray-black or red-brown, the distribution area has a large and small, there are lumps and strips, rolled into the depth of the difference between shallow and deep. The cause is the high rolling temperature of the formation of recycled iron oxide is pressed into the surface of the strip or heating time and heating temperature is too high to cause oxidation atmosphere and generate iron oxide in the rolling pressed into. The thickness of the generated iron oxide, usually depends on the heating conditions, steel quality, the opening and final rolling temperature.

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