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Method for producing medium and low carbon aluminum killed steel

A technology for low-carbon aluminum killed steel and a production method, which is applied in the fields of iron and steel metallurgy and continuous casting, can solve problems such as serious blockage and increase production cost, and achieve the effects of improving the pourability of molten steel and alleviating the phenomenon of nozzle blockage.

Inactive Publication Date: 2011-11-23
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the casting section is small (for example, the section is not more than 40000mm 2 ) of the continuous casting slab, due to the smaller inner diameter of the submerged nozzle of the mold, the blockage is more serious
In order to overcome the above problems, in the prior art, methods such as calcium treatment are used to treat high melting point Al 2 o 3 Denaturing the inclusions of the system to transform them into Al with a low melting point 2 o 3 Inclusions, so as to improve the pourability of molten steel, but this method increases the production cost

Method used

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  • Method for producing medium and low carbon aluminum killed steel
  • Method for producing medium and low carbon aluminum killed steel

Examples

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Embodiment 1

[0055] 20CrMnTi gear steel is smelted using a 120t converter, argon blowing after tapping, LF furnace ladle refining, and continuous casting of 200mm×200mm billets. 0.17% to 0.23%, using aluminum as a deoxidizer to deoxidize molten steel.

[0056] The sulfur content of molten iron blended into the converter is 0.015%, and the [C] content at the end of converter smelting is 0.08%. When the steel is tapped to about 30%, add 3.5kg / ton of molten steel aluminum to deoxidize the molten steel, and add 2.0kg / ton of molten steel ferrosilicon, 16.5kg / ton of molten steel ferromanganese and 14kg / t steel of low-carbon chromium The iron alloys the molten steel. When about 50% of the steel is tapped, add 4kg / ton of active lime and 0.8kg / ton of molten steel to the ladle. After tapping, blow argon at a small flow rate for 10 minutes to the molten steel in the ladle to fully float the deoxidized product and improve the purity of the molten steel. Thereby deoxidized and alloyed molten steel i...

Embodiment 2

[0061] This embodiment is basically the same as Embodiment 1, except that the steel in this embodiment is subjected to vacuum cycle degassing and refining treatment (i.e., RH vacuum treatment) after the steel of this embodiment is refined by blowing argon for the second time, as follows:

[0062] Carry out RH vacuum treatment on the molten steel. During the treatment process, the gas flow rate is increased to 1400NL / min, and the treatment time is 12 minutes when the vacuum degree is less than 3mbar. After 12 minutes of treatment, the vacuum degree is maintained, and the alloy and recarburizer are added for alloying and carburization. Among them: recarburizer 0.5kg / ton molten steel, ferro-titanium 1.6kg / ton molten steel, ferrosilicon 1.3kg / ton molten steel, ferromanganese 1.2kg / ton molten steel, low-carbon ferrochrome 0.6kg / ton molten steel. After alloying, circulate for 5 minutes to make the composition uniform. Break the vacuum, then blow argon for 8 minutes and leave the sta...

Embodiment 3

[0064] 20CrMnTi gear steel is smelted using a 120t converter, argon blowing after tapping, LF ladle furnace refining, and 200mm×200mm billet continuous casting. 0.17%~0.23%, deoxidized by aluminum iron.

[0065] The sulfur content of the molten iron blended into the converter is 0.012%, and the [C] content at the end of converter smelting is 0.05%. When the steel is tapped to about 20%, 3.5kg / ton of aluminum and iron are added to the molten steel to deoxidize the molten steel, and 2.0kg / ton is added Ferrosilicon in molten steel, ferromanganese in 16.5kg / ton of molten steel, low-carbon ferrochromium in 14kg / t of steel, and recarburizing agent in 0.85kg / ton of molten steel are used for alloying and recarburizing of molten steel. Add 6kg / ton of molten steel active lime, 1.2kg / ton of molten steel fluorite, feed 200m of aluminum wire into the ladle after tapping, and then use 0.8NL / (ton of steel·min) flow of argon gas to the ladle The molten steel is blown with argon for 10 minute...

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Abstract

The invention provides a method for producing medium and low carbon aluminum killed steel, which comprises the following steps of: controlling the content of sulfur in molten iron to be not more than 0.015 percent; primarily smelting the molten iron to form molten steel, and tapping; adding an aluminum deoxidizer into the molten steel when 20 to 30 weight percent of molten steel is tapped; adding4.0 to 6.0kg of active lime and fluorite in an amount which is 0.2 times that of the active lime into each ton of molten steel when 31 to 50 weight percent of molten steel is tapped; performing argonblowing refining for the first time; adding aluminum in two or three batches and 1.5 to 4kg of refining slag into each ton of steel in a steel ladle, heating, and refining; performing calcium treatment on the molten steel; performing argon blowing refining for the second time; and performing continuous casting. By the method, the castability of the molten steel can be improved, the phenomenon of water nozzle clogging is avoided, and the continuous casting heats of a single tundish in the continuous casting process of the medium and low carbon aluminum killed steel are not less than 8 heats.

Description

technical field [0001] The invention relates to the technical fields of iron and steel metallurgy and continuous casting, and more specifically relates to a method capable of increasing the number of continuous casting furnaces of medium and low carbon aluminum killed steel. Background technique [0002] In the prior art, during the process of pouring medium-low carbon aluminum-containing steel (that is, medium-low carbon aluminum-killed steel) by continuous casting, due to the high melting point of aluminum oxide (Al 2 o 3 ) series inclusions and calcium silicate (CaSiO 3 ) and other inclusions are easy to adhere to the inner wall of the submerged nozzle of the crystallizer, causing it to be blocked, so the number of continuous casting furnaces for a single tundish is low (for example, less than 6 furnaces), the production cost increases, and the production organization is affected. Great impact. And generally, the higher the content of acid-soluble aluminum ([Al]) in th...

Claims

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Application Information

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IPC IPC(8): B22D11/116B22D11/117
Inventor 陈天明陈亮陈永曾建华杨森祥李桂军李清春雷辉陈小龙
Owner PANZHIHUA IRON AND STEEL
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