Vacuum forced oxygen blowing decarburization method

An oxygen blowing decarburization and vacuum technology, applied in the field of metallurgy, can solve the problems of low production efficiency, prolonged decarburization treatment time, slow vacuum degree drop process, etc., to reduce carbon content, good decarburization effect, and high decarburization efficiency. Effect

Active Publication Date: 2019-01-25
SICHUAN PAN YAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can be used to produce steel with very low carbon content, but this method needs to control the vacuum degree of the oxygen blowing process, and the vacuum degree decreases slowly, which prolongs the decarburization treatment time to a certain extent, and the production efficiency is correspondingly low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.41% of C, 0.041% of Mn, 0.062% of P, 0.003% of S, 0.04% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0029] Specific steps:

[0030] (1) Add 231 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom combined blowing converter, and utilize the function of oxygen blowing and decarburization of the top-bottom combined blowing converter to initially smelt the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.058wt%, a Mn content of 0.032wt%, a P content of 0.0081wt%, a S content of 0.0051wt%, and a temperature of 1671°C, the thick slag begins to be tapped into the ladle.

[0031] (2) The small platform is treated with argon blowing, and the temperature of the smal...

Embodiment 2

[0038] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.52% of C, 0.05% of Mn, 0.062% of P, 0.002% of S, 0.04% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0039] Specific steps:

[0040] (1) Add 233 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.066wt%, a Mn content of 0.033wt%, a P content of 0.0085wt%, a S content of 0.0046wt%, and a temperature of 1668°C, the thick slag begins to be tapped into the ladle.

[0041] (2) The small platform is treated with argon blowing, and the temperature of the small platform is 1598°C.

[0042]...

Embodiment 3

[0048] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.42% of C, 0.04% of Mn, 0.065% of P, 0.004% of S, 0.04% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0049] Specific steps:

[0050] (1) Add 236 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom re-blowing converter, and use the function of the top-bottom re-blowing converter to decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.076wt%, a Mn content of 0.032wt%, a P content of 0.0082wt%, a S content of 0.0055wt%, and a temperature of 1666°C, the thick slag begins to be tapped into the ladle.

[0051](2) The small platform is treated with argon blowing, and the temperature of the small platform is 1589°C.

[0052] (3) In the LF furnace, the a...

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Abstract

The invention relates to a method for blowing oxygen to decarburize, in particular to a method for compulsively blowing oxygen to decarburize in vacuum, and belongs to the technical field of metallurgy. In order to solve the problem, the invention provides the method for compulsively blowing oxygen to decarburize in vacuum, and the method can quickly decarburize and improves production efficiency. The method for compulsively blowing oxygen to decarburize in vacuum comprises the following steps of: a, converter smelting; b, LF; c, RH; and d, continuous casting, wherein oxygen blowing amount of RH is controlled according to pull-in [C]*1.33+200-350 ppm, Rh pulls in vacuum to start circulation, i.e., a lower oxygen gun is started, oxygen is started to blow when vacuum degree is smaller than or equal to 10 kPa, and pressure control is not adopted in an oxygen blowing process. The method is adopted, vacuum degree of RH does not need to be controlled, equipment process is simple, quick decarburizing effect is further generated, decarburizing efficiency is high and the decarburizing effect is very good.

Description

technical field [0001] The invention relates to an oxygen blowing decarburization method, in particular to a vacuum forced oxygen blowing decarburization method, and belongs to the technical field of metallurgy. Background technique [0002] Xichang Steel’s vanadium products are positioned as high-quality, high-value-added varieties, and steel for automotive panels is its primary development goal. However, from the comparison of the initial product quality with domestic and foreign advanced manufacturers, the obvious gap lies in the control of product carbon content. Before the subject work was carried out, the carbon content of Xichang Steel Vanadium IF steel was basically between 0.0030% and 0.0050% (the proportion of finished carbon ≤0.0020% was less than 40%), which was far lower than the control level of domestic advanced manufacturers’ finished product carbon ≤0.0020% in the same period , can only meet the production needs of general-quality ultra-low carbon steel, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068C21C7/10
CPCC21C7/068C21C7/10
Inventor 周伟曾建华张彦恒何俊峰
Owner SICHUAN PAN YAN TECH
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