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The general process used for production of cold rolled (CR) steel sheets is based on the metalworking or rolling process, which includes passing the metal steel through one or more pair of rolls to reduce the thickness. The entire process starts from preparation of pig iron in a blast furnace, where a mixture of coke and iron ore reacts together. This pig iron is then passed through a converter as well as continuous casting equipment to obtain a slab type steel product. This slab is then hot rolled (through a hot rolling mill containing pairs of rolls) and pickled (under the impact of a pickling line).
To form the cold rolled sheets from such hot rolled pickled products, the temperature of the steel is maintained below its re-crystallization temperature (normally the room temperature), while making it pass through a cold reduction mill (pairs of rolls to reduce thickness). This cold rolling process results in the formation of hard CR sheets that showcase less formability, uniform thickness and immense strength (due to strain hardening).
It is sometimes necessary to reheat such hard CR sheets during the annealing process to increase their formability and make them soft. Such a combination of cold rolling, followed by annealing helps in greater refinement of steel, that is more desirable for end use in automobiles, chemical industry, and so on.
Manish Kumar Singh (Power2SME Pvt Ltd)
Plot No 88 Udyog Vihar Phase 4 , Gurugram, Haryana, India
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