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Molten steel treatment method for ultra-low carbon aluminum killed steel

An ultra-low-carbon aluminum-killed steel and processing method technology, applied in the field of iron and steel smelting, can solve the problems of difficult control of molten steel inclusions, poor castability, insufficient oxygen, etc., achieve controllable processing time, improve refining processing capacity, and easy operation control effect

Active Publication Date: 2020-02-18
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that when the prior art processes ultra-low carbon aluminum-killed molten steel, the problem of oxygen deficiency or high oxygen is prone to occur during decarburization, the inclusions of molten steel are difficult to control, and the castability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Refined steel type IF3

[0038] Steel composition level requirements: <=0.0050%C, <=0.03%%Si, 0.10%~0.25%Mn, 0.02%~0.07%Als, 0.050%-0.085%Ti;

[0039] Molten steel treatment method:

[0040] A, molten steel amount 130.2 tons, add 200Kg lime (CaO content > 90%) when tapping, add 200kg slagging agent (CaO content 45%, Al 2 o 3 content 21%, Al content 6.5%);

[0041] B. When the molten steel arrives at the refining LF furnace, measure the temperature at 1585°C, fix the oxygen at 880ppm (higher than 800ppm), enter the station to sample and test the composition of 0.027% C, add 205Kg of high alkalinity refining slag (CaO>70%, CaF 2 >20%), the heating time is 21 minutes, 20Kg of aluminum particles are added out of the station, the temperature of the out station is 1642°C, and the oxygen is 767ppm;

[0042] C. Molten steel enters the RH station to measure the temperature at 1638°C, set the oxygen to 751ppm, VCD (after vacuum decarburization) to set the oxygen...

Embodiment 2

[0043] Embodiment 2: Refined steel type IF7

[0044] Basic requirements for steel composition: <=0.0030%C, <=0.02%%Si, 0.10%-0.25%Mn, 0.02%-0.06%Als, 0.050%-0.070%Ti, 0.008%-0.020%Nb;

[0045] Molten steel treatment method:

[0046] A, molten steel amount 130.7 tons, add 202Kg lime (CaO content > 90%) when tapping, add 200kg slagging agent (CaO content 45%, Al 2 o 3 content 21%, Al content 6.5%);

[0047] B. When the molten steel reaches the refining LF furnace, the temperature is measured at 1572°C, the oxygen concentration is 390ppm (less than 450ppm), and the composition of 0.042% C is sampled at the station, and 205Kg of high alkalinity refining slag (CaO content>70%, CaF 2 content>20%), heating time is 21 minutes, temperature measurement at out station is 1642°C, oxygen concentration is 397ppm;

[0048] C. The temperature of molten steel entering the RH station is 1638°C, the fixed oxygen is 375ppm, and the oxygen blowing volume is 45Nm 3 , VCD to fix oxygen at 361pp...

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Abstract

The invention discloses an ultra-low carbon aluminum killed steel molten steel treatment method and belongs to the technical field of iron and steel smelting. The ultra-low carbon aluminum killed steel molten steel treatment method aims at solving the problems that when ultra-low carbon aluminum killed steel molten steel is treated in the prior art, oxygen deficiency or high oxygen is generated easily during decarburization, molten steel inclusions are difficult to control, and the pourability is poor. The ultra-low carbon aluminum killed steel molten steel treatment method comprises the following steps that A, lime is added in a molten steel tapping process, and a slag regulating agent is added after tapping; B, high-alkalinity refining slag is added to a molten steel LF station, and theoxygen activity before the process of leaving the LF station is controlled to be within 800 ppm; and C, a molten steel RH station controls the oxygen activity of the molten steel to be within the range of 500 ppm-800 ppm, and the slag regulating agent is added during the process of leaving the RH station. By the adoption of the ultra-low carbon aluminum killed steel molten steel treatment method,the oxygen activity and slagging process of molten steel are properly controlled, the problems of insufficient oxygen and high oxygen during decarburization are solved, the state of molten steel inclusions is controlled stably, the refining processing capacity of the RH molten steel is improved, the pourability of the molten steel is improved, and the quality of continuous casting products is ensured.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for treating molten steel of ultra-low-carbon aluminum-killed steel. Background technique [0002] In the field of steel plates, cold-rolled complex deformed parts, such as parts used in refrigerators, TVs, and automobile panels, require weight reduction and weight reduction, require a certain strength and have complex deformations. In order to meet the performance requirements, the general composition design feature of this type of steel is ultra-low carbon, low silicon, and manganese-containing aluminum-killed steel. The general basic composition range is [C]: 0.0015%-0.0060%, [Si]: 0.00% -0.15%, [Mn]0.10%-0.80%, [Als]0.015%-0.08%. [0003] The high Al content and extremely low C content in this type of steel make the molten steel easy to secondary oxidation, and the pourability of the molten steel is poor. In order to meet the requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068C21C7/10C21C7/06
CPCC21C7/0087C21C7/06C21C7/068C21C7/10
Inventor 赵启成
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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