Oxygen top blown converter steel making method

A converter steelmaking and oxygen top blowing technology, applied in the manufacture of converters, etc., can solve the problems of low desulfurization and dephosphorization capacity, long slagging time, and short slagging time, so as to improve metal yield and reduce auxiliary material consumption , the effect of shortening the smelting time

Inactive Publication Date: 2009-11-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of low desulfurization and dephosphorization ability and long slagging time of the conventional molten iron smelting method used in the converter steelmaking process in Panxi area, and provide a converter steelmaking with high desulfurization and dephosphorization ability and short slagging time method

Method used

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  • Oxygen top blown converter steel making method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0027] Put 150 tons of molten iron into the converter for smelting, wherein the composition and temperature of the molten iron are shown in Table 1 below, then blow oxygen into it and add auxiliary materials, the total of the added auxiliary materials (lime, high magnesium lime and acidic composite slag) The weight and the total amount of oxygen blown are shown in Table 2.

[0028] The corresponding relationship between the addition method of auxiliary materials and the amount of oxygen blowing is: taking the total amount of oxygen blown as a benchmark, when the amount of oxygen blowing is 1%, 60% by weight of lime and 67% by weight of high magnesium lime are added When the amount of oxygen blowing is 4%, 50% by weight of the total amount of composite slag is added; when the amount of oxygen blowing is 35%, 20% by weight of the total amount of lime i...

Embodiment 2

[0040] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0041] Put 132 tons of molten iron into the converter for smelting, and then add 6.5 tons of steel scrap, wherein the composition of the molten iron and steel scrap and the furnace temperature of the molten iron are shown in Table 4 below, then blow oxygen into it and add auxiliary materials, the added auxiliary materials ( The total weight of lime, high magnesium lime, composite slag and sludge pellets (produced from finely powdered converter sludge containing 45-50% metallic iron) and the total amount of blown oxygen are shown in Table 5.

[0042] According to the carbon content of the molten iron, the static steelmaking model is used to calculate by computer that it is necessary to add a coolant to cool the steelmaking system by 60°C.

[0043] The corresponding relationship between the way of adding auxiliary materials and the amount of oxygen blo...

Embodiment 3

[0053] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0054] Put 137.96 tons of molten iron into the converter for smelting, and then add 9.241 tons of scrap steel, wherein the composition of the molten iron and scrap steel and the furnace temperature of the molten iron are shown in Table 7 below, then blow oxygen into it and add auxiliary materials, the added auxiliary materials ( The total weight of lime, high magnesium lime, composite slag and sludge pellets (produced from finely powdered converter sludge containing 45-50% metallic iron) and the total amount of blown oxygen are shown in Table 8.

[0055] According to the carbon content of the molten iron and the amount of steel scrap added, the static steelmaking model is used to calculate by computer that it is necessary to add a coolant to cool the steelmaking system by 72°C.

[0056]The corresponding relationship between the way of adding auxiliar...

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Abstract

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.4-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.7m and catch carbon lance position is 1.4-1.5m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when the oxygen blowing content is 0.5-5%; the method of the invention is suitable for smelting high-level steel grade which has high requirements on P and S in a manner of large quantity of slag by molten iron which has relatively high content of P and S after being pretreated. The method can effectively lower consumption of auxiliary materials for molten iron smelting in Panxi Area, shortens smelting time and improves metal yield.

Description

technical field [0001] The invention relates to a method for making steel in an oxygen top-blown converter. Background technique [0002] Steelmaking with pig iron as raw material requires oxidative decarburization. If the content of P and S in the steel is too high, it will cause the "cold brittleness" and "hot brittleness" of the steel respectively, so P and S should be removed at the same time in the steelmaking process. For ordinary hot metal steelmaking, the static control method is based on the known raw material conditions and the end point composition and temperature of blowing steel, and based on the principle of material balance and heat balance to calculate the molten iron, scrap steel, coolant, slag, ferroalloy and supply The method of adding the amount of oxygen. [0003] Compared with ordinary molten iron, the steelmaking of vanadium-titanium molten iron in Panxi area has its own characteristics. The vanadium and titanium content of molten iron in Panxi area...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
Inventor 梁新腾陈永李安林戈文荪何为肖明富李桂军杨森祥李清春蒋龙奎杨辉合孙维松
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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