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A method for steelmaking with converter double slag

A converter and slag making technology, applied in the manufacture of converters and other directions, can solve the problem of low dephosphorization rate of semi-steel

Active Publication Date: 2016-01-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new converter double slag steelmaking method in order to overcome the defect that the dephosphorization rate is not high when the semi-steel is blown in the converter by the existing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment is used to illustrate the method for making steel with converter double slag provided by the present invention.

[0036] For a 120t converter in a certain factory, 130±5t semi-steel is mixed into the converter. The main components of the semi-steel are C: 3.7% by weight, traces of Si and Mn, P: 0.07% by weight, and the temperature of the semi-steel is 1310°C. The semi-steel is subjected to double-slag steelmaking in the converter, and the same oxygen lance is used in the whole process, and the specific operation is as follows:

[0037] (1) The first blowing: the blowing starts, top blowing oxygen, and the oxygen lance adopts a lower oxygen blowing intensity of 3.2Nm 3 / min.t steel, the steelmaking slagging material ton of steel is added to the converter according to the addition of 19kg of active lime, 19kg of high magnesium lime, and 16.1kg of acidic slagging agent, and the position of the oxygen lance is controlled at 1.4-2.0m. The gas supply intensi...

Embodiment 2

[0043] This embodiment is used to illustrate the method for making steel with converter double slag provided by the present invention.

[0044] For a 120t converter in a certain factory, 130±5t semi-steel is mixed into the converter. The main components of the semi-steel are C: 3.8% by weight, traces of Si and Mn, P: 0.065% by weight, and the temperature of the semi-steel is 1300°C. The semi-steel is subjected to double-slag steelmaking in the converter, and the same oxygen lance is used in the whole process, and the specific operation is as follows:

[0045] (1) The first blowing: the blowing starts, top blowing oxygen, and the oxygen lance adopts a lower oxygen blowing intensity of 3.2Nm 3 / min.t steel, the steelmaking slagging material ton of steel is added to the converter according to the addition of 18kg of active lime, 20kg of high magnesium lime, and 15.5kg of acidic slagging agent, and the position of the oxygen lance is controlled at 1.4-2.0m. The gas supply intens...

Embodiment 3

[0052] This embodiment is used to illustrate the method for making steel with converter double slag provided by the present invention.

[0053] For a 120t converter in a certain factory, 130±5t semi-steel is mixed into the converter. The main components of the semi-steel are C: 3.6% by weight, traces of Si and Mn, P: 0.085% by weight, and the temperature of the semi-steel is 1280°C. The semi-steel is subjected to double-slag steelmaking in the converter, and the same oxygen lance is used in the whole process, and the specific operation is as follows:

[0054] (1) The first blowing: the blowing starts, top blowing oxygen, and the oxygen lance adopts a lower oxygen blowing intensity of 3.1Nm 3 / min.t steel, the steelmaking slagging material ton of steel is added to the converter according to the addition of 22kg of active lime, 22kg of high magnesium lime, and 18.5kg of acidic slagging agent, and the position of the oxygen lance is controlled at 1.4-2.0m. The gas supply intens...

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PUM

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Abstract

The invention provides a converter double-slag steelmaking method. The method comprises the following steps: (1) adding semi-steel to be blown and a first batch of slagging materials into the converter for performing primary blowing, turning down the converter to pour slag when the furnace hearth temperature of the converter is 1560-1600 DEG C and the carbon content of molten steel in the converter is 0.8-1.2 weight percent, wherein the slag pouring amount is 60-80 weight percent of total amount of the furnace slag generated during the primary blowing; and (2) adding a second batch of slagging materials into the molten steel obtained in the step (1) for performing secondary blowing. According to the method provided by the invention, the phosphorus content in the semi-steel can be reduced to an extremely low level.

Description

technical field [0001] The invention relates to a double slag steelmaking method of a converter. Background technique [0002] With the increasing demand for high-quality steel, the requirements for phosphorus content in steel are higher. At present, the method of smelting low-phosphorus steel in the converter basically adopts the "double slag method", and some steel mills use the "double method". The double slag method is a method in which the blowing is suspended by raising the gun in the middle of the blowing, and after pouring out part of the slag, the method of adding slag to make slag again. The double-link method means that one converter dephosphorizes first, and then the other converter decarbonizes and heats up. Smelting by double-link method makes production organization difficult and production cost is high. When molten iron is used as the furnace raw material, there are problems of low alkalinity and high temperature at the initial stage of smelting by double ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 梁新腾曾建华李扬洲龚洪君杨森祥杨晓东喻林陈均何为陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP