All coiled flat-rolled steel is initially hot-rolled by passing a slab through a rolling mill to reduce thickness. Hot-rolled steel can be either shipped as is, “hot-rolled black”, or cleaned in a hydrochloric acid bath, which removes black oxide scale that forms during hot rolling, and sold as “hot-rolled pickled." Hot rolled steel can also be rolled again to achieve thinner gauges without reheating (cold rolling), or coated with a metallic coating to enhance product performance. Hot-rolled steel is used for non-critical surface applications such as automotive frames, dumpsters, snowplows, and unexposed construction products.
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