It is a type of casting process where Billet, Bloom, Slab, etc. is obtained by continuously pouring molten steel into water-chilling molds which are in a fixed shape and plucking them out in a half-coagulated form from the bottom of the molds.

In continuously pouring a molten metal and coagulating it to make boards, bars, wires and products for public use, several products of certain length (the longest 2~3 meters) are made first and they go through plastic working. In continuous casting, a molten metal is continuously poured at the upper side of water-chilled molds, and because the bottoms of the molds are open, the coagulated ingot molds are drawn downwards. Products with lengths of dozens meters can be produced in this way.

A molten metal which is poured into a mold coagulates after filling the mold up, but in continuous casting, the mold is low in depth and the bottom of the mold is open so the metal coagulates from outside as it goes downwards. Also, there is a funnel-shaped part consisting of metals in fusion, thus products of a long length come out from the bottom one by one.

Gas coming out from the molten metal when coagulating and residue caused by oxidation of the metals in fusion always float at the top of the molten metal area, which enables production of long products without bubbles, thus it is a suitable method for mass production and quality improvement.