Production method of nickel-free copper-phosphorus weathering steel casting blank

A production method and technology of weathering steel, applied in the direction of improvement of process efficiency, etc., can solve the problems of weathering steel pouring irregular casting slab surface quality, slag consumption, high iron loss, low utilization rate of molten iron phosphorus, etc., to achieve improvement Improve the utilization rate of phosphorus in molten iron, reduce the consumption of slagging materials and iron loss, and meet the effect of energy saving and emission reduction

Active Publication Date: 2021-05-07
广西柳钢华创科技研发有限公司 +1
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AI Technical Summary

Problems solved by technology

[0005] The invention provides a production method of a nickel-free copper-phosphorus weathering steel billet to solve the problems of slag-forming material consumption, high iron loss, low utilization rate of phosphorus in molten iron, high production cost, and nickel-free copper-phosphorus weathering resistance in the smelting process. Problems of steel pouring irregularity and billet surface quality

Method used

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  • Production method of nickel-free copper-phosphorus weathering steel casting blank

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Example 1: 137 tons of molten iron, 21 tons of scrap steel, basicity control at the end of the converter: 2.32; add 20.6kg of lightly burned steel per ton and 9.5kg of lime, and the oxygen supply intensity is 2.2-3.3Nm 3 / min·t, blowing with oxygen once to the end point; tapping carbon (C) at the end point: 0.06wt%, tapping phosphorus (P): 0.072wt%, tapping temperature: 1679°C, cooling water for continuous casting crystallizer The flow rate is controlled, the flow rate of cooling water is controlled at 8.6m / s, the specific water volume of secondary cooling is 1.02L / kg, the temperature of the tundish is controlled at 1531-1537°C; the section of the casting machine is 1350mm, and the casting speed is controlled at 1.35-1.40m / min. The produced slab has no cracks on the surface, and the internal and external quality of the slab is normal.

Embodiment 2

[0063] Example 2: 140 tons of molten iron, 19 tons of scrap steel, basicity control at the end of the converter: 2.21; add 19.2kg of lightly burned steel per ton and 8.5kg of lime, and the oxygen supply intensity is 2.3-3.1Nm 3 / min·t, blowing with oxygen once to the end point; at the end point, tapping carbon (C): 0.051wt%, tapping phosphorus (P): 0.068wt%, tapping temperature: 1673°C, for continuous casting crystallizer cooling water The flow rate is controlled, the cooling water flow rate is controlled at 8.6m / s, the secondary cooling specific water volume is 0.88L / kg, the tundish temperature is controlled at 1532-1539°C; the cross-section of the casting machine is 1350mm, and the casting speed is controlled at 1.40m / min. There is no crack on the surface of the slab, and the internal and external quality of the slab is normal.

Embodiment 3

[0064] Example 3: 135 tons of molten iron, 23 tons of scrap steel, basicity control at the end of the converter: 1.82; add 19.3kg of lightly burned steel per ton and 9.2kg of lime, and the oxygen supply intensity is 2.6-3.5Nm 3 / min·t, one oxygen supply blowing to the end point; end point tapping carbon (C): 0.07wt%, tapping phosphorus (P): 0.080wt%, tapping temperature: 1663°C, cooling water for continuous casting crystallizer The flow rate is controlled, the cooling water flow rate is controlled at 7.7m / s, the secondary cooling specific water volume is 0.73L / kg, the tundish temperature is controlled at 1533-1542°C; the cross-section of the casting machine is 1210mm, and the casting speed is controlled at 1.40-1.45m / min. The produced slab has no cracks on the surface, and the internal and external quality of the slab is normal.

[0065] The technical characteristics of the embodiment of the present invention:

[0066] 1. Adopt the blowing mode with less slag and less slag to...

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Abstract

The invention provides a production method of a nickel-free copper-phosphorus weathering steel casting blank. The production method of the nickel-free copper-phosphorus weathering steel casting blank is characterized in that the nickel-free copper-phosphorus weathering steel casting blank comprises the following components of 0.05wt% to 0.10wt% of C, 0.30wt% to 0.50wt% of Si, 0.40wt% to 0.55wt% of Mn, 0.07wt% to 0.15wt% of P, less than or equal to 0.005wt% of S, 0.3wt% to 0.5wt% of Cr, 0.2wt% to 0.5wt% of Cu, 0.020wt% to 0.050wt% of Alt; less than or equal to 0.035wt% of Ti; no Ni alloy, and the balance Fe and inevitable trace elements, and the production method of the nickel-free copper-phosphorus weathering steel casting blank sequentially comprises the following process routes of molten iron desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining and straight arc type slab casting machine continuous casting. According to the method, slag making material consumption and iron loss in the smelting process are reduced, a molten iron phosphorus utilization rate is increased, and the problems of unsmooth pouring of nickel-free copper-phosphorus weathering steel and poor casting blank surface quality are solved.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a production method of a nickel-free copper-phosphorus weathering steel billet. Background technique [0002] In traditional oxygen top-blown converter steelmaking, in order to remove impurities such as phosphorus and sulfur in steel, a large amount of lime and other slagging materials need to be added to form foam slag. During the oxygen blowing process, a large amount of iron is oxidized into the slag. Iron loss in the larger. Converter smelting generally consumes about 60kg of slagging materials such as lime and light burning per ton of steel, and the amount of converter slag is more than 100kg. The cost is about 70 yuan. [0003] Copper-phosphorus weathering steel molten steel is prone to surface cracks and even leaks during slab pouring, which has a huge impact on production smoothness and molten steel yield. In order to reduce the hot brittleness of copper and improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06C22C38/20C22C38/28B22D11/111C21C1/02C21C7/064
CPCC22C33/06C22C38/02C22C38/04C22C38/002C22C38/20C22C38/06C22C38/28Y02P10/20
Inventor 李宗强邓深李源源刘川俊杨跃标钱学海杨正府刘崇林文震
Owner 广西柳钢华创科技研发有限公司
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