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Smelting method of low-carbon high-phosphorus steel

A carbon high phosphorus steel and a smelting method technology, applied in the metallurgical field, can solve the problems of inability to maintain phosphorus content, waste of alloy cost, furnace body damage, etc., and achieve the effects of saving cost, reducing damage and slowing down the rising rate.

Active Publication Date: 2020-07-24
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If lime and light burning slag are used, lime has a good ability to remove P and S, and it is easy to remove phosphorus, and the phosphorus content cannot be maintained. It is necessary to add phosphorus-iron alloy to the molten iron to match the phosphorus composition. To a certain extent cause a waste of alloy cost
In addition, for low-carbon and high-phosphorus steel series, it is easy to cause damage to the furnace body during the blowing process

Method used

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  • Smelting method of low-carbon high-phosphorus steel
  • Smelting method of low-carbon high-phosphorus steel
  • Smelting method of low-carbon high-phosphorus steel

Examples

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Effect test

Embodiment 1

[0058] A smelting method of low-carbon and high-phosphorus steel, which comprises charging control and blowing control;

[0059] The loading amount control includes: adding 104.2 tons of molten iron and 27.5 tons of scrap steel into a 120-ton converter for smelting, wherein the molten iron composition includes 0.441% Si, 0.176% Mn, 0.108% P and 0.018% S.

[0060] The blowing control includes: adding the first batch of raw dolomite 2076kg to the 120-ton converter 45s after the ignition on at the opening and blowing point, and adding the second batch of raw dolomite 1486kg 201s after the ignition at the opening and blowing point. The working oxygen pressure of the oxygen lance is controlled to be 0.9MPa in the blowing process. In the early stage of blowing, the lance position of the oxygen lance is 1300mm, in the carbon-oxygen reaction period, the lance position of the oxygen lance is 1500mm, and the lance position of the oxygen lance in the later stage of blowing is 1250mm. Th...

Embodiment 2

[0062] A smelting method of low-carbon and high-phosphorus steel, which comprises charging control and blowing control;

[0063] The loading control includes: adding 104.5 tons of molten iron and 27.3 tons of scrap steel into a 120-ton converter for smelting, wherein the molten iron composition includes 0.418% Si, 0.195% Mn, 0.107% P and 0.020% S.

[0064] The blowing control includes: adding the first batch of raw dolomite 2016kg to the 120-ton converter 40s after the ignition on the blowing point, adding the second batch of raw dolomite 1352kg 180s after the ignition on the blowing point, adding the first batch of dolomite 420s after the ignition on the blowing point. Three batches of raw dolomite 253kg. The working oxygen pressure of the oxygen lance is controlled to be 0.9MPa in the blowing process. In the early stage of blowing, the lance position of the oxygen lance is 1300mm, in the carbon-oxygen reaction period, the lance position of the oxygen lance is 1500mm, and the...

Embodiment 3

[0066] A smelting method for low-carbon and high-phosphorus steel, comprising charging system control and blowing control;

[0067] The loading amount control includes: adding 103.2 tons of molten iron and 28.9 tons of scrap steel into a 120-ton converter for smelting, wherein the molten iron composition includes 0.423% Si, 0.171% Mn, 0.111% P and 0.02% S.

[0068] The blowing control includes: adding the first batch of raw dolomite 2004kg to the 120-ton converter 30s after the ignition on at the opening and blowing point, and adding the second batch of raw dolomite 1513kg 3.2min after the ignition at the opening and blowing point. In the blowing process, the working oxygen pressure of the oxygen lance is controlled to be 0.85MPa. In the early stage of blowing, the lance position of the oxygen lance is 1350mm, and in the carbon-oxygen reaction period, the lance position of the oxygen lance is 1510mm. The blowing time of the whole blowing process is 861s, and the oxygen consump...

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Abstract

The invention discloses a smelting method of low-carbon high-phosphorus steel and the low-carbon high-phosphorus steel, and belongs to the technical field of metallurgy. The smelting method of the low-carbon high-phosphorus steel comprises the steps of charge weight control, wherein the weight ratio of molten iron to waste steel is controlled to be (3.4-4.2):1; and blowing control, wherein a firstbatch of raw dolomite is added for slagging 30-60 s after blowing is started and ignition is carried out. The molten iron and the waste steel with the weight ratio of (3.4-4.2):1 are smelted, moltenpool heat balance is basically kept, and damage to furnace liner refractory materials can be reduced. The first batch of raw dolomite is added 30-60 s after blowing is started and ignition is carriedout, the raw dolomite is fast dissolved to fast slag, the utilization rate of oxygen is increased, and scouring of high-speed jet to the furnace liner refractory materials is relieved; and the raw dolomite is decomposed and absorbs heat, decomposed MgO can inhibit and relieve erosion of slag to furnace liner bricks, and the function of protecting a furnace body can be achieved well.

Description

technical field [0001] The present application relates to the field of metallurgical technology, in particular, to a method for smelting low-carbon and high-phosphorus steel. Background technique [0002] At present, the slag-making material for converter steelmaking generally provides active lime containing CaO. Active lime has good P and S removal capabilities, and provides sufficient alkalinity to the slag. and the reaction absorbs it into the slag. Lime is calcined from limestone in a lime kiln and is the most used slag-making material. Light-burning dolomite (referred to as light-burning) is another important slag-making raw material for converter steelmaking, and its main components are CaO and MgO. The addition of light sintering can increase the MgO content in the slag and reduce the erosion of the slag on the lining. Nitrogen splashing can make the slag containing high MgO adhere to the lining brick, protect the lining, and greatly improve the furnace age of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/00C22C38/02C22C38/04
CPCC21C7/00C22C33/06C22C38/002C22C38/02C22C38/04Y02P10/20
Inventor 刘志明佟迎张志明张建平邓长付林伟忠肖双林覃小峰
Owner SGIS SONGSHAN CO LTD
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