CN1320709A - 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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- CN1320709A CN1320709A CN 01108117 CN01108117A CN1320709A CN 1320709 A CN1320709 A CN 1320709A CN 01108117 CN01108117 CN 01108117 CN 01108117 A CN01108117 A CN 01108117A CN 1320709 A CN1320709 A CN 1320709A
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Abstract
An Al-Si-Mn alloy as additive for deoxidizing, alloying, or purifying molten steel contains such components (wt.%) as Al (21-40), Si (10-20), Mn (35-54), C (less than 1), P (less than 0.2), S (less than 0.03) and Fe (the balance), and is prepared through resmelting SiMn alloy, adding Si to remove C, adding slag-forming material, adding Al, casting ingots, and cooling. Its advantages are less ablation of Mn, easy float of slags, high effect, short smelting period, high output and low cost,
Description
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.
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 the alloy 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 inconvenience to material management and use of steel plants.
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: thealloy contains aluminum, silicon, manganese, iron, phosphorus, sulfur and other inevitable impurities, and is characterized by comprising the following components in percentage by weight:
21-40 parts of aluminum;
10-20 parts of silicon;
35-54 parts of manganese;
carbon is less than 1;
phosphorus is less than 0.2;
sulfur is less than 0.03;
the balance of iron;
the preferred weight percentage composition (%) of the present invention 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;
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 of the invention is carried out according to the following steps in sequence:
(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: and removing the 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 99.9 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.
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 method comprises the following steps in sequence:
1. 346Kg of Si-Mn alloy containing 17% of Si and 67% of Mn, which is produced by Kunming alloy plant, is added into the intermediate frequency furnace, and the mixture is heated to 1350 ℃ for remelting.
2. 29Kg of metallic silicon with a silicon content of99% 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. And demolding and air cooling when the open surface of the cast ingot is cooled to orange color (<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 20.3%, the silicon content is 17.5%, and the manganese content is 50.2%.
If other aluminum-silicon-manganese alloys with different weight percentage compositions (%) are prepared, the required raw materials can be weighed according to the required content ratio, and the steps are sequentially carried out. The melting temperature, the thickness of the mold wall, the time of the entire mold opening, and the mold release air cooling temperature are the same as those in the exemplary embodiment.
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 ten thousand tons of aluminum-silicon killed steel is 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 popular and popular among workers in the first production line and has good results for Bao-Steel.
Claims (6)
1. An Al-Si-Mn alloy for deoxidizing molten steel, alloy adding and compounding used for pipeline steel contains Al, Si, Mn, Fe, P and S and other inevitable impurities, and is characterized in that the Al-Si-Mn alloy comprises the following components in percentage by weight:
21-40 parts of aluminum;
10-20 parts of silicon;
35-54 parts 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 Al-Mn-Fe alloy for deoxidation and alloying additions of molten steel as claimed in claim 1, wherein the Al-Mn-Fe alloy comprises in weight percent (%):
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;
3. the method for preparing the Al-Si-Mn alloy for deoxidation and alloying addition compounding of molten steel according to claim 1, which comprises the following steps in sequence:
(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;
(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: and (3) weighing metal aluminum 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, 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 cast ingot is orange red (less than 900 ℃).
4. The method of claim 3, wherein the Si-Mn alloy contains Si in an amount of>16% and Mn in an amount of>66%, the Si in an amount of>99% and the Al in an amount of>99.9%.
5. The method for preparing Al-Si-Mn alloy for deoxidation and alloying additions in molten steel as claimed in claim 3, wherein the wall thickness of said iron mould for ingot casting is not less than 2 cm.
6. The method for preparing Al-Si-Mn alloy for deoxidation and alloyingadditions in molten steel as claimed in claim 3, wherein said cooling step further comprises a blast chilling step.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN1320709A true CN1320709A (en) | 2001-11-07 |
| CN1157485C 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318165C (en) * | 2004-02-27 | 2007-05-30 | 宝山钢铁股份有限公司 | Coverage dregs for ladle |
| 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 |
| 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 |
| CN109694939A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of complex of deoxidation alloying and preparation method thereof |
| CN113005258A (en) * | 2021-02-24 | 2021-06-22 | 广东韶钢松山股份有限公司 | Accident alloy disposal method |
-
2001
- 2001-03-06 CN CNB011081171A patent/CN1157485C/en not_active Expired - Fee Related
Cited By (7)
| 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 |
| CN109694939A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of complex of deoxidation alloying and preparation method thereof |
| CN109694939B (en) * | 2017-10-20 | 2020-09-29 | 鞍钢股份有限公司 | Deoxidation alloying complex and preparation method thereof |
| CN113005258A (en) * | 2021-02-24 | 2021-06-22 | 广东韶钢松山股份有限公司 | Accident alloy disposal method |
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| Publication number | Publication date |
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| CN1157485C (en) | 2004-07-14 |
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Granted publication date: 20040714 Termination date: 20180306 |