CN1157485C - Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process - Google Patents
Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process Download PDFInfo
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- CN1157485C CN1157485C CNB011081171A CN01108117A CN1157485C CN 1157485 C CN1157485 C CN 1157485C CN B011081171 A CNB011081171 A CN B011081171A CN 01108117 A CN01108117 A CN 01108117A CN 1157485 C CN1157485 C CN 1157485C
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Abstract
The present invention discloses Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and a preparing process thereof, which is suitable for smelting pipeline steel. The Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive comprises the components of 21 wt% to 20 wt% of Al, 10 wt% to 20 wt% of Si, 35 wt% to 54 wt% of MN, less than 1.0 wt% of C, less than 0.2 wt% of P, less than 0.03 wt% of S and Fe as the rest. The preparing process of the Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive orderly comprises the following steps: remelting Si-Mn alloy, adding silicon for decarbonization, adding slagging materials to slag, adding aluminium, casting ingots and cooling. Compared with the prior art, the present invention has the characteristics of small burning loss of manganese, easy upward-floating performance of slag, one-time material feeding, smelting time shortening, furnace-time yield enhancement, steel-smelting cost reduction, simple preparation progress, no pulverization to finished products, etc., can effectively perform the compound action of deoxidizing, alloying and purifying molten steel, and is an ideal deoxidizing and alloy additive compound agent for smelting pipeline steel at present.
Description
Technical Field
The invention belongs to an alloy technology, and particularly relates to an aluminum-silicon-manganese alloy for deoxidation and alloy addition compounding, which is suitable for manganese-containing series alloy steel, in particular to pipeline steel smelting, and a preparation method thereof.
Background
Along with the development of national economy, especially the implementation of the western major development strategy in China, the demand of manganese-containing alloy steel series products, especially pipeline steel, is increasing day by day. Deoxidation and alloy addition in pipeline steel smelting are important process links for preparing qualified steel. The deoxidization can be carried out by adopting deoxidant such as aluminum iron, which has obvious effect in the prior art; alloy additions, silicoferromanganese, can be used, as also used in the prior art. The smelting process of respectively adding the deoxidizer and the alloy additive in two steps obviously has the defects of increased material bins, long process flow, troublesome management and operation in front of the furnace, high labor intensity, influence on the output during the furnace due to prolonged smelting time and the like. The Chinese patent discloses a new multi-element strong composite deoxidizer and additive with the application number of 93103724.7, and the function of thealloy is adjusted to use different alloys according to different types of smelted steel. In general terms: when used as a deoxidizer, the aluminum content is higher and the manganese content is lower; when the manganese-aluminum alloy is used as an alloying agent, the manganese content is high, and the aluminum content is low, which undoubtedly brings no need for material management and use in steel mills.
Disclosure of Invention
The invention aims to provide an aluminum-silicon-manganese alloy which has relatively high aluminum content and manganese content and can not be pulverized so as to overcome the defects of the prior art.
The technical scheme adopted for achieving the purpose of the invention is as follows: the alloy contains aluminum, silicon, manganese, iron, phosphorus, sulfur and other inevitable impurities, and is characterized by comprising the following components in percentage by weight:
23 +/-2 of aluminum;
silicon 18 plus or minus 2;
50 +/-4 of manganese;
carbon is less than 1;
phosphorus is less than 0.2;
sulfur is less than 0.03;
the balance of iron;
the invention is composed of the above given weight percentage, because the aluminum content is improved, the deoxidation effect of the molten steel is obviously improved, and meanwhile, the invention has the function of protecting manganese with aluminum, thereby effectively reducing the burning loss of manganese; because the composite oxide (slag) generated by aluminum, silicon and manganese has low melting point and large particles, the slag is easy to float upwards and remove, thereby being beneficial to purifying molten steel; the aluminum-silicon-manganese alloy has large mass (specific gravity), is easy to enter molten steel and not easy to burn, and has high utilization rate of aluminum and silicon and high yield of manganese; because the molten steel can be added in one step during smelting, the material bin is saved, the process is simplified, the labor intensity is reduced, the smelting time is shortened, and the output during furnace time is improved. Compared with the prior art, the novel composite material has obvious outstanding substantive features and remarkable progress.
The preparation method of the invention needs to effectively solve the problem of pulverization of the aluminum-silicon-manganese alloy so as to meet the practical application of molten steel smelting. The inventors of the present invention fully consider that when the aluminum content is>30%, and its higher carbon content, it is the main factor that causes the alloy to become powdered. The mechanism of powdering is described in the specification of the earlier patent No. 94111237.3 by this company. Therefore, the invention adopts the technical measures of adding silicon to remove carbon and chilling the cast ingot so as to solve the problem of pulverization. The preparation method comprises the following steps:
(1) remelting: weighing silicon-manganese alloy according to the material proportion, putting the silicon-manganese alloy into an intermediate frequency furnace, and heating to 1300-1350 ℃;
(2) carbon removal: weighing metal silicon according to the material proportion and putting the metal silicon into the molten liquid prepared in the first step; the chemical reaction is represented by the formula Removing formed slag;
(3) slagging: slag making materials which comprise 30 percent of fluorite powder and 70 percent of industrial salt in percentage by weight are put into the melt prepared in the second step and are fully stirred to remove slag;
(4) adding aluminum: weighing metal aluminum according to the material proportion, putting the metal aluminum into the slag-removing melt prepared in the third step, and heating to 1350 +/-5 ℃;
(5) ingot casting: quickly casting the melt prepared in the fourth step into an iron mold, wherein the whole ingot casting process time is less than 8 minutes;
(6) and (3) cooling: and (3) rapidly cooling, demoulding and air cooling when the open surface of the cast ingot is orange red (<900 ℃).
The silicon content of the silicon-manganese alloy is more than 16 percent, the manganese content is more than 66 percent, the silicon content of the metal silicon is more than 99 percent, and the aluminum content of the metal aluminum is more than 99 percent.
The wall thickness of the iron mold for casting the ingot is more than or equal to 2cm, so that the iron mold has enough heat capacity and heat dissipation area.
And the cooling step also adopts blowing chilling to realize rapid cooling in high-temperature seasons in summer.
Certainly, in the second step of the carbon removal step of the preparation method, the aim of carbon removal can be achieved by adding metal titanium with the titanium content of 95 percent or adding ferroboron with the boron content of 20 percent.
Detailed Description
Typical examples of the preparation process of the present invention are: taking a 500Kg intermediate frequency furnace as an example, the total feeding amount is 470Kg, and the methodcomprises the following steps in sequence:
1. 346Kg of silicon-manganese alloy (produced by Kunming alloy works) with 17% silicon content and 67% manganese content is added into the intermediate frequency furnace, and the temperature is raised to 1350 ℃ for remelting.
2. 29Kg of metallic silicon with a silicon content of 99% was added to remove carbon.
3. 2Kg of slag forming material consisting of 30% fluorite powder and 70% industrial salt is added for slag forming.
4. 95Kg of metallic aluminum with the aluminum content of 99.99 percent is added, and the temperature is raised to 1350 ℃.
5. And (4) quickly casting the melt prepared in the step (4) into an iron mold with the wall thickness of 20mm, and carrying out ingot casting. The whole ingot casting time is 5 minutes.
6. And controlling the solidification cooling speed of the aluminum-silicon-manganese alloy melt in the casting mold to be more than 120 ℃/second. Demoulding and air cooling when the open surface of the cast ingot is orange red (<900 ℃).
Through the steps, 445Kg of aluminum-silicon-manganese alloy can be prepared, and the yield reaches 94.6 percent. The aluminum content of the alloy is 21.3%, the silicon content is 17.5%, and the manganese content is 50.2%.
The aluminum-silicon-manganese alloy of the invention is tried in Shanghai Bao steel smelting pipeline steel for 150 heats, and the comparison result shows that: the smelting time of each furnace is shortened by 10-15 min; the direct production cost is reduced by 3 yuan/ton steel. If 500 million tons of aluminum-silicon killed steel are produced in Bao steel year, the production cost can be saved by 1500 ten thousand yuan per year; the purity of the steel is detected to meet the standard, and all indexes are obviously improved; the alloy is not pulverized after being stored for more than 3 months. Therefore, the aluminum-silicon-manganese alloy of the invention is obtained from Bao-Steel and has good comment on the common of workers in the production line.
Claims (2)
1. The composite Al-Si alloy containing Al, Si, Mn, Fe, P, S and other inevitable impurities for deoxidation of molten steel for pipeline steel is characterized by that its composition in wt.% (%) is:
23 +/-2 of aluminum;
silicon 18 plus or minus 2;
50 +/-4 of manganese;
carbon is less than 1;
phosphorus is less than 0.2;
sulfur is less than 0.03;
the balance of iron;
2. the method for preparing the composite Al-Si-Mn alloy added to the molten steel deoxidization-alloy according to the claim 1, which is characterized by comprising the following steps in sequence:
(1) remelting: weighing silicon-manganese alloy with silicon content of more than 16% and manganese content of more than 66% according to the material proportion, putting the silicon-manganese alloy into an intermediate frequency furnace, and heating to 1300-1350 ℃;
(2) carbon removal: according to the material proportion, metal silicon with the silicon content of more than 99 percent is put into the melt liquid prepared in the first step;
(3) slagging: slag making materials which comprise 30 percent of fluorite powder and 70 percent of industrial salt in percentage by weight are put into the melt prepared in the second step and are fully stirred to remove slag;
(4) adding aluminum: weighing metal aluminum with aluminum content more than 99% according to the material proportion, putting the metal aluminum into the deslagging molten liquid prepared in the third step, and heating to 1350 +/-5 ℃;
(5) ingot casting: rapidly casting the melt prepared in the fourth step into an iron mold with the wall thickness of more than or equal to 2cm, wherein the whole ingot casting process time is less than 8 minutes;
(6) and (3) cooling: and (3) rapidly cooling, blowing and chilling until the open surface of the cast ingot is orange red (<900 ℃), demoulding and air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011081171A CN1157485C (en) | 2001-03-06 | 2001-03-06 | Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011081171A CN1157485C (en) | 2001-03-06 | 2001-03-06 | Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1320709A CN1320709A (en) | 2001-11-07 |
| CN1157485C true CN1157485C (en) | 2004-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011081171A Expired - Fee Related CN1157485C (en) | 2001-03-06 | 2001-03-06 | Al-Si-Mn alloy for deoxidizing molten steel and as alloy additive and its preparing process |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434539C (en) * | 2003-12-03 | 2008-11-19 | 洛阳忠诚集团有限公司 | Rare earth silicon manganese aluminium iron alloy for steel liquid deoxidation and its preparation process |
| CN1318165C (en) * | 2004-02-27 | 2007-05-30 | 宝山钢铁股份有限公司 | Coverage dregs for ladle |
| CN102839258A (en) * | 2011-10-24 | 2012-12-26 | 上海中捷有色金属有限公司 | Aluminum-silicon-manganese-iron compound deoxidizer for steel making |
| CN104498669A (en) * | 2014-11-25 | 2015-04-08 | 上海应用技术学院 | High deoxidation rate aluminum silicon manganese compound deoxidizer |
| CN109694939B (en) * | 2017-10-20 | 2020-09-29 | 鞍钢股份有限公司 | Deoxidation alloying complex and preparation method thereof |
| CN113005258B (en) * | 2021-02-24 | 2022-04-12 | 广东韶钢松山股份有限公司 | Accident alloy disposal method |
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| CN1320709A (en) | 2001-11-07 |
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Granted publication date: 20040714 Termination date: 20180306 |