A method for making continuous casting slabs for direct rolling
A production method and technology of continuous casting slabs, which are applied in metal rolling and other directions, can solve the problems that the surface temperature of slabs cannot meet the requirements of direct rolling, prone to accidents in casting, and high costs, so as to stabilize the thickness of the slab shell and improve the internal quality , the effect of avoiding steel breakout accidents
Inactive Publication Date: 2022-04-12
HEBEI IRON AND STEEL
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Problems solved by technology
[0003] Aiming at the problems that the surface temperature of the slab cannot meet the requirements of direct rolling when the slab is directly rolled, the energy consumption is high, the cost is high, and the casting accident is prone to occur, the invention provides a continuous casting slab for direct rolling. method
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[0021] A method for making a continuous casting slab for direct rolling; the method comprises the following steps:
[0022] S1: The molten steel after refining (mass content of chemical elements in molten steel: C: 0.23%, Si: 0.45%, Mn: 1.36%, V: 0.073%, P: 0.03%, S: 0.023%, Cr: 0.20 %, the balance of Fe and inevitable impurities) is added to the tundish of a 6-machine 6-strand full-arc (base arc radius is 7m) type 165mm × 165mm billet continuous casting machine, and the upper nozzle of the tundish The specification is Φ21mm, the specification of the water outlet is Φ20mm, the temperature of the control tundish is 1520-1535°C, and the superheat is 15-35°C;
[0023] S2: Distribute molten steel into six crystallizers with a length of 900mm through the tundish, and control the flow of cooling water in the crystallizer to 140-160m 3 / h, the temperature difference between the inlet and outlet of the cooling water in the crystallizer is 7-10°C;
[0024] S3: Molten steel is formed ...
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Abstract
The invention relates to the technical field of metallurgy, and specifically discloses a method for making a continuous casting slab for direct rolling. The method for making the continuous casting slab for direct rolling is to inject the refined molten steel into a tundish, transfer the molten steel into a crystallizer through the tundish to shape the molten steel, solidify and crystallize, obtain castings, and then The casting is pulled out through a tension leveler to obtain a continuous casting slab; the temperature of the molten steel in the tundish is 1520-1535°C, and the degree of superheat is 15-35°C; the cooling water flow rate in the crystallizer is 140 ‑160m 3 / h; the pulling speed of the tension leveler is 2.4-2.6m / min. The production method of the continuous casting slab provided by the present invention can realize that the continuous casting slab is pulled out from the continuous casting machine and directly enters the rolling mill for rolling, which avoids heating and supplementary heat, saves a lot of energy consumption, and reduces the production cost of the casting slab , At the same time, it reduces the accidents of continuous casting and steel breakout, which greatly improves the safety of production.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for making a continuous casting slab for direct rolling. Background technique [0002] After the molten steel produced by the converter is refined in the refining furnace, the molten steel needs to be cast into billets of different types and specifications. The continuous casting section is the production process of continuously casting the refined molten steel into billets. The main equipment includes a rotary table, a tundish, a crystallizer, and a straightening machine. At present, in the bar production process, the continuous casting billet is provided from the continuous casting machine to the rolling mill. According to the temperature of the casting billet and the process flow, it is generally divided into two modes. 1) Continuous casting billet hot charging and rolling process: refers to continuous casting The billet temperature has not dropped below 700°C, an...
Claims
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IPC IPC(8): B22D11/16B22D11/22B22D11/20B22D11/18B21B1/46
CPCB22D11/16B22D11/22B22D11/20B22D11/18B21B1/463
Inventor 杨斌孔超汪青山魏建旭刘营李尔东牛志涛
Owner HEBEI IRON AND STEEL