The billet is the product obtained after the molten steel made by the steelmaking furnace is subjected to the billet casting production process.
Steel billets refer to semi-finished products used for the production of steel, which generally cannot be directly used by society, but can be used as mechanical parts after processing.
The manufacturing process of the billet can be mainly divided into two types: die-casting billet and continuous-casting billet. The die-casting process has been basically eliminated.
Billet Production Process
The billet production process is divided into three types:
First, through the continuous casting equipment of the steelmaking system, the molten steel is directly cast into the billet;
The second is the semi-finished steel products processed by the rolling equipment of the steel rolling system for the steel ingots or continuous casting billets produced by the steelmaking system;
The third is the semi-finished product processed by the forging equipment for the ingot produced by the steelmaking system.
Continuous casting is the continuous casting of molten steel into billets through a continuous casting machine and then sent to the subsequent rolling production line to be rolled into products.
Continuous Casting Billet Production Process:
Continuous casting is the process of converting molten steel into steel billets.
The molten steel that has been processed upstream is transported to the turntable in a ladle, divided into several strands by the molten steel distributor, and injected into specifically shaped casting molds, where it begins to cool and solidify to form a cast embryo with a solidified shell on the outside and molten steel on the inside. , and then the cast embryo is drawn into the arc-shaped sprue and continues to solidify to complete solidification after secondary cooling.
After straightening, it is cut into pieces according to the length of the order. The square shape is the large billet, and the plate shape is the flat billet. This semi-finished product can be sent to the rolling mill for rolling after the surface treatment of the steel billet as needed.
At present, in addition to the production of special steel and large-scale steel castings, a small amount of cast steel ingots are required for forging processing. The large-scale production of ordinary steel at home and abroad has basically abandoned the old process of casting steel ingots – billeting – rolling, and most of them use The method of casting molten steel into billets and then rolling them is called “continuous casting”.
In the billet production process, if you do not wait for the steel billet to cool down, do not land on the way, and directly send it to the rolling mill, you can make the required steel products “in one fire”. If the billet is cooled halfway and stored on the ground, the billet can become a commodity sold in the market.