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Slagging process for low-phosphorus steel smelting through converter

A converter smelting, low-phosphorus steel technology, applied in the direction of manufacturing converters, etc., can solve the problems such as no relevant research on the technology, no description of the role of dephosphorization, etc., and achieve the effects of simple addition method, cheap raw materials, and wide slag sources.

Inactive Publication Date: 2015-10-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the investigation of relevant materials such as literature, it was found that no SiO 2 The effect of dephosphorization has been described, but there is no relevant research on the technology of improving the phosphorus fixation phase in slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 uses a 100t converter for smelting, and the target temperature range before blowing ends is 1667°C. SiO of slag material A 2 Content: 98.2%, the rest is impurity content. In the early stage of the converter, the blowing was normal. After the blowing, the slag was added to the converter molten pool through the high-level silo, and then the blowing continued for 2.4 minutes.

Embodiment 2

[0017] Example 2 uses a 100t converter for smelting, and the target temperature range before blowing ends is 1639°C. SiO of slag material A 2 Content: 98.7%, the rest is impurity content. In the early stage of the converter, the blowing was normal. After the blowing, the slag was added to the converter molten pool through the high-level silo, and then the blowing was continued for 1.2 minutes.

[0018] Table 1 Main components of molten iron (mass percentage %, the balance is Fe)

[0019] the case steel type C Si mn P S Hot metal temperature ℃ 1 X70 4.68 0.30 0.14 0.128 0.035 1333 2 14Cr1MoR-H 4.49 0.46 0.12 0.115 0.028 1326

[0020] Table 2 Addition amount of slag

[0021] the case Amount of slag material A added join period molten steel temperature 1 11.2kg / t blowing end 1642℃ 2 7.8kg / t After pulling carbon and dumping slag 1671℃

[0022] Table 3 Impurity composition and temperature of mol...

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PUM

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Abstract

The invention provides a slagging process for low-phosphorus steel smelting through a converter, and belongs to the technical field of converter steelmaking. According to the process procedures and technical parameters for controlling in the process, the process comprises the following steps: before the completion of converter converting, adding a slag material A through a material bin and a waste steel hopper, and continuously blowing for 0.5 to 8 minutes after the slag material A is added, wherein in per ton of molten steel, 5-20 kg of the slag material A is added; after converter converting, carbon catching and deslagging, adding the slag material A through the material bin and the waste steel hopper; before the completion of converter converting or after carbon catching, adding a slag material B through the material bin and the waste steel hopper. The slagging process has the advantages the content of P2O5 in slag can be improved, and the slag dephosphorization capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular provides a slagging method for smelting low-phosphorus steel in a converter, which can increase the P content in slag. 2 o 5 content, improve the dephosphorization ability of slag. Background technique [0002] Steel slag is one of the products of steelmaking. Generally, P in the final slag of the converter 2 o 5 The content is low, around 1.0%-3.0%, and changes with the initial phosphorus content of molten iron. [0003] In order to improve the dephosphorization effect, converter steelmaking pursues slag with high oxidation, high alkalinity, large slag content, and high-intensity molten pool stirring force. However, when smelting low-phosphorus steel, especially low-carbon steel, FeO in the slag after converter blowing is relatively high. 2 o 5 The content becomes lower and lower, and does not have a strong dephosphorization ability. [0004] Through the an...

Claims

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Application Information

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IPC IPC(8): C21C5/36
Inventor 吕延春马长文王国连刘洋王海宝秦登平赵新宇危尚好初仁生王星
Owner SHOUGANG CORPORATION
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