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Method to increase ti yield in 20crmnti gear steel smelting

A technology of yield and gear steel, which is applied in the field of increasing Ti yield in 20CrMnTi gear steel smelting, can solve the problems of low Ti yield, achieve the effects of increasing titanium yield, improving steel quality, and reducing costs

Active Publication Date: 2016-03-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the yield rate of Ti is not high in the production technology of the existing gear steel, and provide a method for improving the yield rate of Ti in the smelting of 20CrMnTi gear steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for improving Ti yield in 20CrMnTi gear steel smelting, its steps are as follows:

[0021] 1) The billet is smelted in a converter using a high-drawing carbon process, and the carbon content at the end point is controlled to 0.08% to prevent overoxidation of the molten steel, and the dissolved oxygen w[O] in the molten steel is controlled to 400×10 -6 %, to prevent peroxidation of molten steel;

[0022] 2) At the end of converter smelting, argon is blown from the bottom of the converter to stir the molten steel to promote the balance of steel and slag;

[0023] 3) Use slag blocking to keep continuous argon blowing during the tapping process, control the tapping temperature at 1670°C, and control the amount of slag in the converter to 50mm; Add 1 kg of aluminum block deoxidation, 6 kg of quicklime, 1 kg of fluorite to each ton of molten steel, control the carbon content to 0.18% (including the carbon brought into the alloy), and Mn, Si, and Cr are in the lowe...

Embodiment 2

[0032] The method for improving Ti yield in 20CrMnTi gear steel smelting, its steps are as follows:

[0033] 1) The billet is smelted in a converter using a high-drawing carbon process, and the carbon content at the end point is controlled to be 0.09% to prevent overoxidation of the molten steel, and the dissolved oxygen w[O] in the molten steel is controlled to be 345×10 -6 %, to prevent peroxidation of molten steel;

[0034] 2) At the end of converter smelting, argon is blown from the bottom of the converter to stir the molten steel to promote the balance of steel and slag;

[0035] 3) In the process of steel tapping, slag blocking is used to keep blowing argon continuously during the steel tapping process, the tapping temperature is controlled at 1667°C, and the amount of slag in the converter is controlled to 40mm; while the steel is being tapped, the alloying outside the furnace is carried out. Add 0.92 kg of aluminum block deoxidation, 5.8 kg of quicklime, 0.9 kg of flu...

Embodiment 3

[0044] The method for improving Ti yield in 20CrMnTi gear steel smelting, its steps are as follows:

[0045] 1) The billet is smelted in a converter using a high-drawing carbon process, and the carbon content at the end point is controlled to 0.08% to prevent overoxidation of the molten steel, and the dissolved oxygen w[O] in the molten steel is controlled to be 390×10 -6 %, to prevent peroxidation of molten steel;

[0046] 2) At the end of converter smelting, argon is blown from the bottom of the converter to stir the molten steel to promote the balance of steel and slag;

[0047] 3) During the tapping process, the slag blocking is used to maintain continuous argon blowing during the tapping process, the tapping temperature is controlled at 1667°C, and the amount of slag in the converter is controlled to 20mm; Add 1 kg of aluminum block deoxidation, 5 kg of quicklime, 0.7 kg of fluorite to each ton of molten steel, control the carbon content to 0.15% (including the carbon br...

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PUM

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Abstract

The invention discloses a method for improving yield of Ti in 20 CrMnTi gear steel smelting. The method reduces the total oxygen content of molten steel through reducing the oxygen blowing amount at a converter, and reduces the oxidability of the molten steel and obtains proper alkalinity through aluminum so as to achieve the purpose of improving the yield of the titanium. Compared with the prior art, the method can improve the yield of the titanium from 45% to 75% and above, so that the titanium alloy cost is largely decreased; and when the yield of the Ti is improved, the method precisely controls the Ti to guarantee the stability of steel components so as to enhance the steel quality and to finally achieve the stability and consistency of the steel overall performance.

Description

technical field [0001] The invention relates to the technical field of gear steel production, in particular to a method for increasing the Ti yield in the smelting of 20CrMnTi gear steel. Background technique [0002] Gear steel is a major branch of alloy structural steel, accounting for 20% of the total alloy structural steel. Its use covers a wide range. In addition to the manufacturing and use of vehicle gears such as cars, trucks, agricultural vehicles, and motorcycles, construction machinery gears are also used in a large amount. At present, the annual demand for gear steel in my country is about 500,000 tons. The amount of gear steel is very large, not only requires its good quality and high reliability, but also must be low in price. 20CrMnTi is a good alloy carburizing steel. It is mainly used to manufacture important mechanical parts that withstand high stress and impact loads, such as motor driving gears, automobile universal joint crossheads, etc. It is the large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/072C21C7/04
CPCY02P10/20
Inventor 徐志东徐志朱启铭范植金吴杰周新龙龙莉
Owner 武汉钢铁有限公司
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