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Recarburization nitrogen control production method of intermediate-carbon high-alloy steel

A production method and technology of high alloy steel, applied in the field of metallurgy, can solve the problems of reducing nitrogen content and rarely having the whole process, and achieve the effect of cost reduction

Active Publication Date: 2018-07-06
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In patent CN201110440322.4, in order to reduce the nitrogen content brought in by the carburant, a method of calcining anthracite with a low-nitrogen carburant instead of pitch coke is used, but it only restricts the link of the carburant, which has obvious limitations
In addition, most of the current patents are for nitrogen control in converters, and few consider the whole process; and they are basically limited to the single aspect of nitrogen control
[0005] At present, there is no report on the carbon increase and nitrogen control production method of medium carbon high alloy steel. The present invention will elaborate on the carbon increase and nitrogen control production method of medium carbon high alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The carbon-increasing and nitrogen-controlling production method of high-carbon high-alloy steel 22MnB5 in this embodiment includes molten iron desulfurization, converter smelting, LF refining treatment, and slab continuous casting process. The specific process steps are as follows:

[0033] (1) Desulfurization process of molten iron: after desulfurization by injecting magnesium powder and lime into the molten iron ladle, use a slag remover to remove the slag until there is no slag on the surface of the molten iron, and control the S of molten iron entering the furnace: 0.003%;

[0034] (2) Converter smelting process: Converter smelting adopts flue gas analysis combined with static model automatic smelting, the end point temperature of the converter is 1660°C, and the end point oxygen level is 600ppm; the composition of molten steel at the control end point is: C: 0.030%, P: 0.007%;

[0035]The feeding sequence in the tapping process is pre-deoxidation carburizer, lime, ...

Embodiment 2

[0044] The carbon-increasing and nitrogen-controlling production method of high-carbon high-alloy steel 22MnB5 in this embodiment includes molten iron desulfurization, converter smelting, LF refining treatment, and slab continuous casting process. The specific process steps are as follows:

[0045] (1) Desulfurization process of molten iron: after desulfurization by injecting magnesium powder and lime into the ladle, use a slag remover to remove the slag until there is no slag on the surface of the molten iron, and control the S of molten iron entering the furnace: 0.001%;

[0046] (2) Converter smelting process: Converter smelting adopts flue gas analysis combined with static model automatic smelting, the end point temperature of the converter is 1680°C, and the end point oxygen level is 728ppm; the composition of molten steel at the control end point is: C: 0.026%, P: 0.009%;

[0047] The feeding sequence in the tapping process is pre-deoxidation carburizer, lime, alloy and c...

Embodiment 3

[0057] The carbon-increasing and nitrogen-controlling production method of high-carbon high-alloy steel 22MnB5 in this embodiment includes molten iron desulfurization, converter smelting, LF refining treatment, and slab continuous casting process. The specific process steps are as follows:

[0058] (1) Desulfurization process of molten iron: after desulfurization by spraying magnesium powder and lime on the ladle, use a slag remover to remove the slag until there is no slag on the surface of the molten iron, and control the molten iron S: 0.002%;

[0059] (2) Converter smelting process: Converter smelting adopts flue gas analysis combined with static model automatic smelting, the end point temperature of the converter is 1690°C, and the end point oxygen level is 800ppm; the composition of molten steel at the control end point is: C: 0.022%, P: 0.010%;

[0060] The feeding sequence in the tapping process is pre-deoxidation carburizer, lime, alloy and carburizer for carburization...

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Abstract

The invention discloses a recarburization nitrogen control production method of an intermediate-carbon high-alloy steel. The recarburization nitrogen control production method comprises the steps of molten iron desulfuration, converter smelting, LF refining treatment and plate blank continuous casting. The intermediate-carbon high-alloy steel comprises the components of 0.21-0.24% of C and less than or equal to 40ppm of N, and the adding quantity of an alloy is greater than or equal to 30 kg per ton of steel. Through rigid control in the various steps, the adding time and the reasonable matching ratio of a carburant in the converter tapping process are optimized, the carbon line usage of the LF procedure is lowered significantly, and the content of finished N is successfully controlled below 40 ppm. On the condition of not adding new procedures and equipment, the technical problems of recarburization nitrogen control are solved on the premise of lowering the cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of carbon-increasing and nitrogen-controlling medium-carbon high-alloy steel. Background technique [0002] Medium-carbon high-alloy steel refers to the steel grade whose C content in the finished steel is in the range of 0.21-0.24%, and the alloy addition amount is above 30kg / t. [0003] At present, the production of this type of steel mainly adopts the production process of molten iron desulfurization→converter→LF→continuous casting, and the N≤40ppm of the finished product is required. Due to the high requirements of C content in the finished product, the amount of carburization of the alloy cannot meet the requirements and has a large gap with the C content of the finished product; and because of the strict requirements on the N content of the finished product, direct carburization by means of forging coal carburizers usually requires LF argo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/072C21C5/28B22D11/111C22C38/04C22C38/02C22C38/06C22C38/28C22C38/32
CPCB22D11/111C21C5/28C21C7/0068C21C7/06C21C7/064C21C7/072C22C38/001C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32
Inventor 路博勋李梦英马德刚杨杰王耐李梦龙刘靖宝冯晓勇王建兴
Owner TANGSHAN IRON & STEEL GROUP
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