At present, there are three kinds of raw materials for rolling steel production: continuous casting billet, steel ingot, and forged steel billet.
Continuous casting billet is the final product of steelmaking and the main raw material for steel production. In China's steel production, some special-purpose rolling mills (such as wheel hoop mills) and some special steel rolling mills directly use steel ingots as raw materials to produce finished steel. The other special steel needs to be rolled into various billets by the blooming mill, medium-sized billet rolling mill or forging press, and then used for various types of finished rolling mills.
Due to the wide variety of steel products, different sizes, and different process, the requirements of various types of finished rolling mills are different. Whether the choice of billet is reasonable has a great impact on steel production.
It is very important to select the proper type, section shape, size and weight of the billet for rolling steel production.
The reasonable choice of blanks can not only improve the quality of the steel, but also the production capacity of the rolling mill can be achieved, and the metal consumption is greatly reduced. Otherwise, it will seriously affect the rolling production.
Therefore, steel rolling production has certain technical requirements for raw materials. The requirements for steel ingots are steel grade, chemical composition, physical dimensions, weight, and surface quality. The requirements for steel billets and continuous casting billets are steel grade, section shape and size, weight and surface quality. These technical requirements are necessary to ensure the quality of the steel and are specific to be considered when determining and selecting the blank.