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Bottom blowing gas supply method for stainless steel converter and stainless steel converter bottom thereof

A technology of converter bottom blowing and stainless steel, applied in the manufacture of converters, etc., can solve problems such as brick collapse, furnace bottom scour, and furnace bottom refractory materials are prone to defects caused by machine vibration, so as to achieve the effect of synchronous life and reduced erosion speed

Active Publication Date: 2013-12-18
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain shortcomings in this masonry method, mainly: the bottom gun cannot be guaranteed to be in the center of the brick in the working layer, and the furnace bottom refractory material is susceptible to defects caused by machine vibration during the drilling process, and bricks are prone to collapse and fall off during the smelting process; Under the given gas distribution mode of the bottom gun, the bottom blowing gas will seriously scour the bottom of the furnace

Method used

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  • Bottom blowing gas supply method for stainless steel converter and stainless steel converter bottom thereof
  • Bottom blowing gas supply method for stainless steel converter and stainless steel converter bottom thereof
  • Bottom blowing gas supply method for stainless steel converter and stainless steel converter bottom thereof

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Effect test

Embodiment 1

[0018] The present embodiment is carried out on the stainless steel converter 90t, and the gas is supplied at the bottom of the stainless steel converter of the present invention, and what is smelted is 430 stainless steel. In this process, the carbon content needs to be blown from 4.0% to 0.25%. Bottom gun gas distribution mode: carbon content reduced from 4.0% to 0.5% bottom gun center pipe and ring pipe for N 2 ; During the process of dropping from 0.5% to 0.25%, N is supplied in the central tube of the bottom gun 2 and O 2 , ring pipe for N 2 , N 2 :O 2 =2:1.

[0019] The diameter of the air supply hole 4 of the central pipe 2 is Φ12mm, the thickness of the central pipe 2 is 2mm, and the gap 5 between the ring pipe 3 and the central pipe 2 is 1mm. The ratio of the gas supply area of ​​the ring pipe 3 ie the cross-sectional area of ​​the gap 5 to the gas supply area of ​​the central tube 2 ie the gas supply hole 1 is 0.47. See figure 1 .

[0020] On the premise of ...

Embodiment 2

[0022] The present embodiment is carried out on the stainless steel converter 90t, the gas is supplied at the bottom of the stainless steel converter of the present invention, and 409L stainless steel is smelted. In this process, the carbon content needs to be blown from 4.0% to 0.25%. Bottom gun gas distribution mode: the carbon content is reduced from 4.0% to 0.5% and Ar is supplied to the center tube and ring tube of the bottom gun; Ar and O are supplied to the center tube of the bottom gun during the process of decreasing from 0.5% to 0.25% 2 , ring pipe for Ar, N 2 :O 2 =2:1.

[0023] The diameter of the air supply hole 4 of the central pipe 2 is Φ12mm, the thickness of the central pipe 2 is 2mm, and the gap 5 between the ring pipe 3 and the central pipe 2 is 1mm. The gas supply area of ​​the ring pipe 3, that is, the cross-sectional area of ​​the gap 5, and the ratio of the gas supply area of ​​the central tube 2, that is, the gas supply hole 1, is 0.47, see figure 1...

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Abstract

The invention relates to a bottom blowing gas supply method for a stainless steel converter and a stainless steel converter bottom thereof. The bottom blowing gas supply method for the stainless steel converter comprises the step of supplying gas via a gap between an annular tube of a bottom gun and a central tube and a gas supply hole of the central tube, and is characterized in that the ratio of the annular sectional area of the gap between the annular tube of the bottom gun and the central tube to the sectional area of the gas supply hole of the central tube ranges from 0.4 to 0.6. The stainless steel converter bottom comprises working layer bricks, a permanent layer and a furnace bottom shell, wherein a furnace bottom flange is arranged under the furnace bottom shell; 4-6 bottom gun holes are drilled in the working layer bricks before construction. The stainless steel converter bottom is characterized in that the axis of each bottom gun hole is aligned to the hole center of the furnace bottom flange, the difference between the axis of each bottom gun hole and the hole center of the furnace bottom flange on the horizontal plane is not greater than 0.1 mm, and all bottom guns are arranged at the centers of the bottom gun holes. The bottom blowing gas supply method for the stainless steel converter and the stainless steel converter bottom thereof have the advantage that the furnace age is prolonged to more than 700 times from 450 times of an existing gas supply method.

Description

technical field [0001] The invention relates to a method for blowing and supplying gas from the bottom of a stainless steel converter and the bottom of the stainless steel converter. Background technique [0002] The stainless steel converter K-OBM-S is a top-bottom double-blown converter bottom. The bottom lance adopts double-layer casing, which has the characteristics of low energy consumption and high decarburization rate. It can be used to produce high-alloy stainless steel with element content greater than 30%. Due to the particularity of smelting, the life of refractory materials at the bottom and lining of the converter is not synchronized, and the furnace age is relatively low, resulting in an increase in the cost of refractory materials. The non-production time of replacing the furnace shell is longer, which has a certain impact on the production capacity of stainless steel. The low life of the bottom of the furnace is one of the most important factors affecting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/48C21C5/30
Inventor 赵鑫淼陈景锋郭晓兵
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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