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A kind of smelting method of high carbon aluminum killed steel

A technology for high-carbon aluminum killed steel and a smelting method, applied in the field of steelmaking, can solve the problems of increasing the cost of refractory materials and the influence of the purity of molten steel, and achieve the effects of improving the purity, reducing high-temperature erosion, and being convenient to operate.

Active Publication Date: 2020-07-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the cost of refractory materials, but also these refractory materials are eroded by the high temperature of molten steel in the tundish, which will also have a negative impact on the purity of molten steel

Method used

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  • A kind of smelting method of high carbon aluminum killed steel
  • A kind of smelting method of high carbon aluminum killed steel
  • A kind of smelting method of high carbon aluminum killed steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The smelting method of the high-carbon aluminum-killed steel adopts the following specific processes.

[0017] (1) The production steel type is GCr15A-B2 high-carbon aluminum killed steel for a casting time, the section of the continuous casting machine is 200mm*200mm, and the standard requirement for its main chemical (smelting) composition is (wt): C 0.95%~1.05% , Si 0.15%~0.35%, Mn 0.25%~0.45%, P≤0.020%, S≤0.020%, Cr 1.40%~1.64%, Al≤0.050%, and the balance is Fe and unavoidable impurities.

[0018] (2) Converter process: the C content at the end point of the molten steel is controlled at ≥0.25wt%, and the Al content before the LF process is controlled at ≥0.010wt%, and other components are controlled according to the requirements of the work instruction; the carbon content at the end point of the converter is shown in Table 1.

[0019] Table 1: Converter endpoint carbon (wt%)

[0020]

[0021] (3) LF refining process: the temperature measurement ran...

Embodiment 2

[0033] Embodiment 2: The smelting method of the high-carbon aluminum-killed steel adopts the following specific processes.

[0034] (1) Production of steel GCr15-A for a certain casting time, continuous casting machine section 200mm*200mm, the standard requirements for its main chemical (smelting) composition (wt): C 0.95% ~ 1.05%, Si 0.15% ~ 0.35% , Mn 0.25%~0.45%, P≤0.020%, S≤0.020%, Cr 1.40%~1.64%, Al≤0.050%, the balance is Fe and unavoidable impurities.

[0035] (2) Converter process: the C content at the end point of molten steel is controlled at ≥0.25wt%, and the Al content before the LF process is controlled at ≥0.010wt%, and other components are controlled according to the requirements of the work instruction; the carbon content at the end point of the converter is shown in Table 6.

[0036] Table 6: Converter endpoint carbon (wt%)

[0037]

[0038] (3) LF refining process: the temperature measurement range of molten steel entering the station for each heat is 1486-1...

Embodiment 3

[0050] Embodiment 3: The smelting method of the present high-carbon aluminum-killed steel adopts the following specific processes.

[0051] (1) Production of steel grade GCr15 for a certain casting time, continuous casting machine section 200mm*200mm, the standard requirements for its main chemical (smelting) composition (wt): C 0.95%~1.05%, Si 0.15%~0.35%, Mn 0.25%~0.45%, P≤0.020%, S≤0.020%, Cr 1.40%~1.64%, Al≤0.050%, the balance is Fe and unavoidable impurities.

[0052] (2) Converter process: Control the C content at the end point of molten steel at ≥0.25wt%, and ensure that the Al content before the LF process is controlled at ≥0.010wt%, and other components are controlled according to the requirements of the work instructions; the carbon content at the end point of the converter is shown in Table 11.

[0053] Table 11: Converter endpoint carbon (wt%)

[0054]

[0055] (3) LF refining process: the temperature measurement range of molten steel entering the station for e...

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Abstract

The invention relates to a smelting method for high carbon aluminum killed steel. The smelting method comprises a converter step, a refining step and a continuous casting step. The converter step comprises the following steps: controlling the C content at an ending point of molten steel to be greater than or equal to 0.25wt% and controlling the C content to be greater than 0.010% before Al in thesteel is ladled; the refining step comprises the following steps: by adopting LF+RH processes, prohibiting calcium treatment in a refining period; after RH vacuum treatment, soft-blowing a steel ladlefor over 15 minutes and leaving the molten steel for 20-30 minutes; and controlling the Al out of a station to be over 0.025%; and the continuous casting step comprises the following steps: separately placing 5-10kg of a ferrosilicon powder heating agent at rims of bowls at the bottoms of stoppers in first flow and eighth flow of a tundish before pouring, and adopting control of differentiated pulling rates, wherein the pulling rates of the first and eighth flows are 1.0-1.05 m / min, the pulling rates of the second and seventh flows are 0.95-0.98 m / min, the pulling rates of the third and sixthflows are 0.93-0.95 m / min and the pulling rates of the fourth and fifth flows are 0.88-0.90 m / min. Impurities are reduced effectively, and occluded foreign substances float up fully, so that the degree of purity of the molten steel is improved effectively. The smelting method has the advantages of being low in cost, convenient to operate and wide in application range, improving the continuous casting heats and the casting blank yield and the like under the circumstance that the structure of an existing tundish is not changed.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to a method for smelting high-carbon aluminum-killed steel. Background technique [0002] The carbon content of the high-carbon aluminum-killed steel is above 0.95wt%, and the aluminum content is 0.02wt%-0.05wt%. A large amount of Al with high melting point is produced during the deoxidation process 2 o 3 Non-metallic inclusions, the purity of molten steel is not easy to control. In the prior art, the Al with high melting point is usually treated with calcium 2 o 3 Way to switch to low melting point calcium aluminate, but with increased risk of D or DS type inclusions. At the same time, the carbon content of high-carbon aluminum-killed steel is high and the liquidus temperature itself is low (1455°C). Factors in the initial design of the continuous casting machine, the single tundish of 8 machines and 8 streams is long and narrow, and the molten steel flows through the first and eighth t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/10C21C7/06B22D11/11B22D11/20
CPCB22D11/11B22D11/20C21C7/06C21C7/10C22C33/04
Inventor 刘泳齐建军王强巩飞陈红卫赵江张瑞忠董廷亮张志刚
Owner HEBEI IRON AND STEEL
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