A kind of slab continuous casting ordinary carbon steel molten steel treatment method

Abstract

The invention relates to a treating method for molten steel, especially to a treating method for molten plain carbon steel used for continuous casting of a slab, belonging to the field of ferrous metallurgy. To stably control the state of inclusions in the molten steel, improve castability of molten plain carbon steel for continuous casting and guaranteeing the quality of a product of continuous casting, the treating method provided by the invention employs the following concrete steps: A, tapping of molten steel: adding ferrosilicon and silicomanganese alloy during tapping of molten steel obtained through smelting of a primary smelting furnace and adding slag charge with CaO content of greater than CaO during tapping; B, argon blowing of an argon station for oxygen determination and feeding of aluminum wires; and C, LF refining: adding refining slag and aluminum particles into a finery, successively carrying out heating, oxygen determination feeding of aluminum wires and oxygen determination out of the station, and controlling the temperature of the molten steel so as to obtain the molten plain carbon steel used for continuous casting of the slab. The treating method provided by the invention improves tapping and alloying process and slagging control techniques so as to overcome the problem of poor castability of the molten plain carbon steel used for continuous casting, enhance the cleanness of the molten plain carbon steel and guarantee stable and smooth operation and economic benefits of continuous casting production.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for processing molten steel, in particular to a method for processing slab continuous casting plain carbon steel molten steel. Background technique [0002] Slab continuous cast carbon steel is widely used in various fields because of its economy and ease of processing. Therefore, it has a large production proportion in steel plants. The universal composition design feature of this type of steel is low carbon, low silicon, low manganese killed steel, the general basic composition range is [C]: 0.05%-0.20%, [Si]: 0.10%-0.50%, [Mn] 0.10%-0.65%. [0003] At present, for slab continuous casting general carbon steel, although the production volume of this type of steel is large, due to the low composition C and low Si in the steel, the molten steel is easy to reoxidize, and there are molten steel nodules during continuous casting and difficult to cast molten steel. ...

AI Technical Summary

Problems solved by technology

Aiming at the traditional solution to the problem of insufficient castability improvement during slab continuous casting of ordinary carbon steel, the present invention provides appropriate control of alloying, slag formation, and moderate oxygen activity in molten steel during the smelting and refining process. The process of feeding aluminum wire into molten steel can effectively control the level and state of inclusions in molten steel. It is easy to operate and control in the smelting and refining operation site, and can stably control the state of inclusions in molten steel, improving the continuous casting of this type of steel. The pourability of water ensures the quality of continuous casting products. Up to now, there is no proposal about adopting proper slag treatment, rational selection of deoxidizing materials, and accurate control of oxygen activity in the process of slab continuous casting common carbon steel molten steel. Degree (according to Al-Si-O relationship control [O]) process method