Continuous-casting continuous-rolling method for producing sectional materials and bar-wire materials by using residual heat of molten steel

Abstract

The invention provides a continuous-casting continuous-rolling method for producing sectional materials and bar-wire materials by using residual heat of molten steel, which realizes the low consumption and the low emission of carbon dioxide for the production of the sectional materials and bar-wire materials. The method provided by the invention comprises the following technological processes of:molten steel smelting, temperature-control continuous casting, rectification continuous rolling, continuous cutting or coiling, cooling, finishing and packaging and warehousing. According to the invention, the problems of energy source waste, repeatedly cutting, all double-heating and generation of short length in each phase of the prior art are solved. Compared with the prior art, 30-70 kilograms of standard coal can be saved per ton of steel, the oxidation loss is reduced by 0.8-1.5%, the rate of cut loss and roll waste is reduced by 0.5-1.0%, the yield can be increased by 1.5-2.5%, and various indicators of the product all reach the corresponding standards of the product.

Description

technical field [0001] The invention relates to a metallurgical continuous casting and rolling method, in particular to a continuous casting and rolling method for producing profiles, rods and wires by utilizing the residual heat of molten steel. Background technique [0002] The existing continuous casting and rolling production process of profile rods and wires is: molten steel smelting→continuous casting→cutting→secondary heating→segmented continuous rolling→shearing or coiling→cooling→finishing and packaging→storage. In this process, the continuous casting machine and the continuous rolling mill are not on the same center line, and the continuous casting slab needs to be cut off completely. Although hot charging can be realized, it needs to be reheated before it can be sent to the rolling mill for segmental continuous rolling. It belongs to semi-continuous casting and rolling or segmental continuous casting and rolling which partially utilizes the waste heat of molten st...

AI Technical Summary

Problems solved by technology

[0003] There are four main problems in the above process: one is that after the molten steel at about 1600 degrees is cast into a billet, the temperature is only about 700 degrees, and a large amount of heat is wasted; , each section of slab must be cut 2-4 times, and "steel running" accidents may occur when biting in each pass. The scrap rate of cutting loss and accidents reaches 0.5-1%. It causes impact load on the rolling mill, wastes electric energy, and causes severe wear or even damage to the roll; the third is secondary heating, which consumes 30-70 kg of standard coal per ton of steel, which not only consumes fuel, discharges smoke and carbon dioxide, but also produces oxidation loss of 0.8- 1.5%; Fourth, the finished product is cut in sections, and each section produces a short material, which not only causes waste, but also increases the labor intensity of workers