CN109112248B - Converter smelting method of high manganese steel - Google Patents
Converter smelting method of high manganese steel Download PDFInfo
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- CN109112248B CN109112248B CN201710493239.0A CN201710493239A CN109112248B CN 109112248 B CN109112248 B CN 109112248B CN 201710493239 A CN201710493239 A CN 201710493239A CN 109112248 B CN109112248 B CN 109112248B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention provides a converter smelting method of high manganese steel, which comprises the following chemical components in percentage by weight: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements; the converter adopts a duplex method for smelting, manganese ore of 7.5 kg/ton steel to 8.5 kg/ton steel is added into a hopper in the converter tapping process within 3min, and molten steel components required by later-half steel tapping are calculated as C in percentage by mass: 0.04-0.15%, Si < 0.1%, Mn: 4-6%, P < 0.017%, S < 0.008% and tapping temperature 1640-1660 ℃. The method solves the problem of difficult operation caused by low Mn yield and large slag amount due to oxidation of manganese ore added into the traditional furnace.
Description
Technical Field
The invention belongs to the metallurgical field, and particularly relates to a converter smelting method of high manganese steel.
Background
High manganese steel is widely applied to wear-resistant parts, automobiles, mining machinery, ocean platforms and the like in modern society. Because steel generally contains higher Mn, the steel is a steel grade with higher production difficulty in both alloying and continuous casting processes. Generally, the production of such steel grades is an electric arc furnace + die casting process in a special steel mill. The smelting of the electric arc furnace solves the problem of Mn alloying, and the die casting avoids the bending and straightening of continuous casting, thereby reducing the production risk. However, in the converter smelting, due to the oxidizing atmosphere of the converter, the Mn alloy is generally added after the converter or during the refining process, so that the Mn yield can be ensured. However, in recent years, with the large demand for high manganese steels, steels having an Mn content of about 5% have been widely used, but the 5% Mn content increases the refining time when added in the refining process, and the hopper size affects the alloy charging amount when added after the converter. In the smelting process, a large number of papers and patents introduce methods of adding manganese ore or improving the smelting end point residual manganese of the converter, but because the yield is low or the slag quantity is large, the improvement of the yield of Mn in the converter for high manganese steel is a key point.
The related technologies for solving the problem at home and abroad are divided into two types, one is to add a large amount of manganese ore or alloy containing manganese into the converter in the converter smelting process, and improve the yield of Mn by adjusting the lance position in the process, changing the slagging mode and the like. For adding manganese ore into the converter, the yield of Mn is very low, generally lower than 30 percent, due to the oxidizing atmosphere of the converter, and the slag quantity in the converter is large, so that the operation is difficult.
In a converter steelmaking process (application No. CN102168160A) in which manganese ore is directly reduced and alloyed, manganese ore is added into a converter, and controls scrap steel, slag former, lance position operation and the like before addition are controlled, but the method has a low Mn yield and a small total amount of manganese ore added.
The other method is to reach the lowest thermodynamic oxidation point through the whole-process operation control of the converter and reasonable smelting so as to improve the residual manganese at the end point of the converter. The patents for improving the end-point residual manganese have strong operability, but the residual manganese is improved to 0.1-0.2% according to the molten iron condition because of the oxidability of the converter, and the final alloying condition of about 5% cannot be met.
A method for controlling the end point manganese of molten iron with high manganese content (application number is CN106148629A) includes starting with molten iron with different Mn contents, controlling the end point of molten iron with different Mn contents by controlling the carbon drawing gun position, the carbon drawing time and the oxygen flow pressure in the extremely easy process, and controlling the residual Mn at the end point to 0.25% under the condition of high manganese molten iron.
Disclosure of Invention
The invention aims to overcome the problems and the defects and provides a converter smelting method of high manganese steel, which saves the time for adding alloy in refining, reduces the pressure of the turnover of a molten steel tank when in refining, has good effect on inhibiting nitrogen increase, and more importantly utilizes cheap manganese ore to reduce the alloy cost.
A converter smelting method of high manganese steel,
(1) the high manganese steel comprises the following chemical components in percentage by weight: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements;
(2) the pretreated molten iron is required to have P less than or equal to 0.070% and S less than or equal to 0.002%, the converter adopts a duplex method for smelting, the first half steel tapping C is more than 1.5%, Mn is less than 0.2%, Si is less than 0.03%, P is less than 0.010%, S is less than 0.008%, and the tapping temperature is 1400-1450 ℃; gradually adding manganese ore after semi-semisteel smelting for 2-3 min, and adding the manganese ore in batches for ensuring the complete melting of the manganese ore, wherein the manganese ore is added in 4-5 times in 20min, and the addition amount is 20-30 kg/ton steel each time; then adding an aluminum wire section, wherein the adding amount is 9-11 kg/ton steel; adding 7.5 kg/ton steel-8.5 kg/ton steel manganese ore from a hopper in the converter tapping process, finishing the addition within 3min, and tapping C from later half steel: 0.04-0.15%, Mn: 4-6%, Si < 0.1%, P < 0.017%, S < 0.008%, and tapping temperature is 1640-1660 ℃;
the aluminum wire section is added at one time, and the mass fraction of Mn content in the manganese ore is more than 40%.
The invention adopts a duplex converter for smelting, the former half steel is dephosphorized, the latter half steel is smelted to produce reducing atmosphere, and manganese ore is added in the tapping process, and the addition of manganese ore in the converter can ensure that the yield is more than 95%.
The invention has the beneficial effects that: the method provided by the invention solves the problems of difficult operation caused by low Mn yield and large slag amount due to oxidation of manganese ore added into the traditional furnace. Not only solves the problem of alloying the high manganese steel in the converter, but also releases the refining process, and lightens the refining pressure, the turnover pressure of a molten steel tank and the nitrogen increase of the molten steel. The manganese ore with low price is used for replacing manganese metal or manganese alloy, so that the cost is reduced, and the significance is great.
Detailed Description
The present invention is further illustrated by the following examples.
In each of examples 1 to 3, a 100t top-bottom combined blown converter was used.
Example 1:
a method for producing high manganese steel, characterized by:
(1) the final chemical components of the high manganese steel in the embodiment 1 of the invention are as follows in percentage by weight: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015-0.05%, and the balance of Fe and inevitable impurity elements;
(2) the pretreated molten iron requires P: 0.066%, S: 0.0015 percent;
(3) the converter adopts a duplex method for smelting, and the first half steel is tapped into C: 2.23%, Mn: 0.07%, Si: 0.023%, P: 0.0065%, S: 0.0048 percent and the tapping temperature is 1444 ℃;
gradually adding manganese ore in the second semi-steel smelting 2min, adding manganese ore 4 times in 20min, wherein the addition amount of each time is 2.5-2.9 tons of manganese ore, and finally adding 11.4 tons of manganese ore; 1.02 tons of aluminum wire sections are added at one time in 25 min; 800kg of manganese ore is added from a hopper in the converter tapping process, and the addition is finished within 3 min; tapping the second half steel C: 0.054%, Mn: 4.96%, Si: 0.082%, P: 0.0192%, S: 0.0058% and a tapping temperature of 1655 ℃;
(4) after refining, Al adjustment and other alloy elements supplementation, the casting is waited.
(5) The manganese content of the manganese ore is 45%;
example 2:
(1) the final chemical components of the high manganese steel in the embodiment 2 of the invention are as follows in percentage by weight: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements;
(2) the pretreated molten iron requires P: 0.068%, S: 0.0017%;
(3) the converter adopts a duplex method for smelting, and the first half steel is tapped into C: 2.01%, Mn: 0.062%, Si: 0.029%, P: 0.0071%, S: 0.0052% and the tapping temperature of 1436 ℃;
gradually adding manganese ore in the second semi-steel smelting 2min, adding manganese ore 5 times in 20min, wherein the addition amount of each time is 2.0-2.5 tons of manganese ore, and finally adding 11.5 tons of manganese ore; 1.01 tons of aluminum wire sections are added at one time in 25 min; 800kg of manganese ore is added from a hopper in the converter tapping process, and the addition is finished within 3 min; tapping the second half steel C: 0.055%, Mn: 4.968%, Si: 0.082%, P: 0.0166%, S: 0.0056%, and tapping temperature is 1650 deg.C;
(4) after refining and Al adjustment and the complement of other alloy elements, waiting for pouring;
(5) the manganese content of the manganese ore is 45%.
Example 3:
(1) the final composition requirement C of the test steel is as follows: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements;
(2) the pretreated molten iron requires P: 0.064%, S: 0.0019%;
(3) the converter adopts a duplex method for smelting, and the first half steel is tapped into C: 2.0%, Mn: 0.07%, Si: 0.022%, P: 0.0077%, S: 0.0055% and a tapping temperature of 1443 ℃;
and gradually adding manganese ore in the second semi-steel smelting 2min, adding manganese ore 5 times in 20min, wherein the addition amount of each time is 2.0-2.5 tons of manganese ore, and finally adding 11.8 tons of manganese ore. 1.07 tons of aluminum wire sections are added at one time in 25 min; 800kg of manganese ore is added from a hopper in the converter tapping process, and the addition is finished within 3 min; tapping the second half steel C: 0.052%, Mn: 4.967%, Si: 0.087%, P: 0.0162%, S: 0.0059% and the tapping temperature is controlled at 1658 ℃;
(4) after refining and Al adjustment and the complement of other alloy elements, waiting for pouring;
(5) the manganese content of the manganese ore is 45%.
After the test steel is refined and continuously cast, the components of the tundish steel sample and the casting blank sample meet the final requirements, the method saves the precious manganese alloy, shortens the refining treatment time, and meets the requirement of stable production of large-casting-time high manganese steel.
Claims (2)
1. A converter smelting method of high manganese steel is characterized in that,
(1) the high manganese steel comprises the following chemical components in percentage by weight: 0.05-0.15%, Mn: 4% -6%, Si < 0.1%, P < 0.020%, S < 0.015%, and Al: 0.015 to 0.05 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements;
(2) the pretreated molten iron is required to have P less than or equal to 0.070 percent and S less than or equal to 0.002 percent, the converter adopts a duplex method for smelting, the first half steel tapping requires that the molten steel components comprise, by mass percent, C more than 1.5 percent, Mn less than 0.2 percent, Si less than 0.03 percent, P less than 0.010 percent and S less than 0.008 percent, and the tapping temperature is 1400-1450 ℃; gradually adding manganese ore after semi-semisteel smelting for 2-3 min, and adding manganese ore 4-5 times in 20min, wherein the addition amount is 20-30 kg/ton steel each time; then adding an aluminum wire section, wherein the adding amount is 9-11 kg/ton steel; in the converter tapping process, 7.5 kg/ton steel-8.5 kg/ton steel manganese ore is added from a hopper, the addition is completed within 3min, and the semi-steel tapping requires that the molten steel components are calculated as C in percentage by mass: 0.04-0.15%, Si < 0.1%, Mn: 4-6%, P < 0.017%, S < 0.008% and tapping temperature 1640-1660 ℃.
2. The converter smelting method of high manganese steel according to claim 1, wherein the aluminum wire section is added at one time, and the manganese ore Mn content is more than 40% by mass.
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| CN111074037B (en) * | 2019-12-27 | 2021-11-02 | 宁夏晟晏实业集团能源循环经济有限公司 | Process method for upgrading structure of manganese-rich slag smelting product |
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| JPS56139615A (en) * | 1980-04-03 | 1981-10-31 | Nisshin Steel Co Ltd | Production of high-manganse stainless steel |
| SU985130A1 (en) * | 1981-05-04 | 1982-12-30 | Предприятие П/Я В-2869 | Steel composition |
| JP2773525B2 (en) * | 1992-02-28 | 1998-07-09 | 住友金属工業株式会社 | Melting method for grain-oriented electrical steel sheets |
| CN101294230B (en) * | 2008-06-19 | 2011-04-06 | 重庆钢铁(集团)有限责任公司 | Duplex steelmaking technique of revolving furnace |
| CN102168160B (en) * | 2011-03-08 | 2013-04-17 | 武汉钢铁(集团)公司 | Converter steelmaking technology for directly reducing-alloying manganese ore |
| CN102828098A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for increasing molten steel finishing point manganese content by adding manganese ore outside furnace |
| CN105420440A (en) * | 2014-09-19 | 2016-03-23 | 鞍钢股份有限公司 | Alloy adding method for medium-manganese or high-manganese alloy steel in smelting with converters |
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