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Method for smelting low-phosphorus steel by using semi-steel

A low-phosphorus steel and steel smelting technology, which is applied in the manufacture of converters, etc., can solve the problems that it is difficult to meet the needs of low-phosphorus high-grade steel types, the amount of slag is difficult to control, and the phosphorus in molten steel is serious.

Active Publication Date: 2015-07-22
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: when the phosphorus content in the furnace is high, it is difficult to control the final phosphorus within 0.006% by using the single slag method; Too high, it is difficult to meet the needs of low-phosphorus high-grade steel grades

Method used

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  • Method for smelting low-phosphorus steel by using semi-steel
  • Method for smelting low-phosphorus steel by using semi-steel
  • Method for smelting low-phosphorus steel by using semi-steel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] The semi-steel after desulfurization and vanadium extraction is used as the raw material, and its main components are shown in Table 1, and the 120t combined blowing converter is used for blowing. After the semi-steel is mixed into the converter, the oxygen lance starts to blow oxygen, the oxygen blowing pressure is 0.89MPa, and the oxygen supply intensity is 3.81m 3 / min·t 钢 . While starting to blow oxygen, add 28.4kg / t to the furnace 钢 active lime, 6.3kg / t 钢 of high magnesium lime and 31.2kg / t 钢 The composite slagging agent should be added within 3 minutes after the oxygen supply is started. At 6.1 minutes of blowing, the oxygen lance was raised to stop the oxygen supply, 60-80wt% slag by weight was poured out from the shaking furnace, and the temperature of the converter bath was 1476°C.

[0036] After slag dumping, the second blowing is carried out, the oxygen blowing pressure is 0.88MPa, and the oxygen supply intensity is 3.82m 3 / min·t 钢 , at the same time,...

example 2

[0041] The semi-steel after desulfurization and vanadium extraction is used as the raw material, and its main components are shown in Table 2, and a 120t combined blowing converter is used for blowing. After the semi-steel is blended into the converter, the oxygen gun is lowered to start blowing oxygen, the oxygen blowing pressure is 0.88MPa, and the oxygen supply intensity is 3.83m 3 / min·t 钢 . While starting to blow oxygen, add 29.3kg / t to the furnace 钢 active lime, 7.1kg / t 钢 of high magnesium lime and 32.6kg / t 钢 Composite slagging agent, and all added within 3 minutes of starting to blow and supply oxygen. At 6.1 minutes of blowing, the oxygen lance was raised to stop the oxygen supply, 60-80wt% slag by weight was poured out from the shaking furnace, and the temperature of the converter bath was 1482°C.

[0042] After slag dumping, the second blowing is carried out, the oxygen blowing pressure is 0.86MPa, and the oxygen supply intensity is 3.83m 3 / min·t 钢 , at the s...

example 3

[0047] The semi-steel after desulfurization and vanadium extraction is used as the raw material, and its main components are shown in Table 3, and the 120t combined blowing converter is used for blowing. After the semi-steel is blended into the converter, the oxygen gun is lowered to start blowing oxygen, the oxygen blowing pressure is 0.86MPa, and the oxygen supply intensity is 3.61m 3 / min·t 钢 . While starting to blow oxygen, add 28.9kg / t to the furnace 钢 active lime, 6.8kg / t 钢 of high magnesium lime and 31.9kg / t 钢 Composite slagging agent, and all added within 3 minutes of starting to blow and supply oxygen. At 6.4 minutes of blowing, the oxygen lance was raised to stop the oxygen supply, 60-80wt% slag by weight was poured out from the shaking furnace, and the temperature of the converter bath was 1517°C.

[0048] After slag dumping, the second blowing is carried out, the oxygen blowing pressure is 0.88MPa, and the oxygen supply intensity is 3.65m 3 / min·t 钢, at the ...

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Abstract

The invention provides a method for smelting low-phosphorus steel by using semi-steel. The method comprises the following steps: (a) supplying oxygen to a converter molten pool by using an oxygen lance, simultaneously adding a slag making material, and pouring out slag when the temperature of the molten pool is 1460-1520 DEG C, the basicity of the cinder is 1.2-1.9, and the weight percent of total iron content in the cinder is 10-15wt%; (b) supplying oxygen to the converter molten pool by using the oxygen lance again, simultaneously adding the slag making material, and pouring out the slag when the temperature of the molten pool is 1640-1660 DEG C, the basicity of the slag is 4.3-5.2, and the weight percent of total iron content in the slag is 16-20wt%; (c) adding 2-3kg / t steel of final slag adjusting agent by each ton of tapping molten steel to the converter molten pool so as to thicken the slag; (d) adding alloy with low phosphorous content in a tapping process so as to alloy the molten steel; and (e) after molten steel alloying, adding 3-5kg / t steel of active lime by each ton of tapping molten steel and fluorite, the weight of which is 15-20% of the weight of the active lime, to steel ladles. According to the method, phosphorous can be effectively removed in a semi-steel converter steel-making process, and the low-phosphorous steel with the phosphorus content of no more than 0.008% is stably produced.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, and more specifically, the invention relates to a method for smelting low-phosphorus steel from semi-steel. Background technique [0002] When iron and steel enterprises use vanadium-titanium magnetite for smelting, in order to ensure the effective use of vanadium resources, they need to desulfurize and extract vanadium before steelmaking. However, due to the lack of dephosphorization treatment, the mass percentage of phosphorus in the semi-steel is 0.060-0.080%, resulting in the completion of the smelting of the semi-steel using the traditional converter smelting process, and the mass percentage of phosphorus at the end of the converter steelmaking is 0.008-0.008% 0.020%. At the same time, due to the rephosphorization of the ladle slag and the addition of phosphorus in the alloy, the mass percentage of phosphorus is increased by 0.005% to 0.008%, that is, the mass percentage of ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/30
Inventor 杨森祥梁新腾黄德胜王二军曾建华陈天明李盛
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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