CN101445888A - Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material - Google Patents
Method for producing ductile cast iron by taking iron slag taken out by molten iron when pretreating slag skimming as material Download PDFInfo
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- CN101445888A CN101445888A CNA200810246930XA CN200810246930A CN101445888A CN 101445888 A CN101445888 A CN 101445888A CN A200810246930X A CNA200810246930X A CN A200810246930XA CN 200810246930 A CN200810246930 A CN 200810246930A CN 101445888 A CN101445888 A CN 101445888A
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Abstract
The invention relates to a method for producing a ductile cast iron by taking iron slag taken out by molten iron when pretreating a slag skimming as material, which comprises the steps as follows: (1) iron slag is melted in an induction furnace, the smelting temperature ranges from 1500 to 1550 DEG C, and the smelting time is 30 to 60 minutes; (2) CaC2 and 75SiFe are added in a foundry ladle, wherein, CaC2 is 0.7 to 1.8 percent of the original molten iron quantity, and 75SiFe is 1.0 to 2.5 percent of the original molten iron quantity; then molten iron is poured into the foundry ladle for desulfurization treatment and inoculation treatment, the treatment temperature ranges from 1400 to 1450 DEG C, and the time is 8 to 15 minutes; (3) globularizing is performed in a wire feeding manner, a core wire is fed when the desulfurization treatment and the inoculation treatment are about to be completed, and the addition quantity of a nodulizing agent is regulated according to the original molten iron component; and (4) the molten iron which is processed through the globularizing is cast to obtain the ductile cast iron, and the casting temperature ranges from 1350 to 1370 DEG C. The method provides a new approach for producing the ductile cast iron, makes the best use of metallurgical scraps, produces the ductile cast iron through simple working procedures by utilizing the advantage of higher Mg content, and has great significance to recycle waste materials and reduce energy consumption.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of slag iron of taking out of with molten iron pretreatment slag skimming is the method for raw material production spheroidal graphite cast iron.
Background technology
Spheroidal graphite cast iron has higher intensity and toughness preferably, its mechanical property is almost near steel, so its use range enlarges day by day, and output constantly increases, now successful instead of part forged steel pieces or steel casting become the structural metallic materials with broad prospect of application.
At present, produce magnesium iron spare both at home and abroad, mainly adopting foundry iron to add steel scrap, to add an amount of ferrosilicon again be raw material, behind cupola furnace or electric furnace secondary smelting, adopts and pour method and carry out nodularization, inoculation, obtains spheroidal graphite cast iron.There is following drawback in this method production: the one, and the price of starting material (pig iron) is higher, the 2nd, the composition instability may contain more nodularization element, for example Ti, Al, Sn, Pb or the like of influencing in the steel scrap of adding, the 3rd, the method for pouring makes that the specific absorption of nodulizing agent is low, causes the waste of resource.
Summary of the invention
The present invention is directed to the problem that existing production method exists, it is the method for raw material production spheroidal graphite cast iron that a kind of slag iron of taking out of with molten iron pretreatment slag skimming is provided.Under the prerequisite that guarantees the spheroidal graphite cast iron performance, economize on resources, be fit to produce in enormous quantities.
In recent years, some iron and steel enterprises adopt hot metal pretreatment technology to solve the desulfurizing iron problem, by single spray Mg or spray Mg again and lime powder is realized.Which kind of mode no matter, S content obviously reduces in the molten iron after treatment, has a large amount of Mg in addition and is dissolved in the molten iron.And it is low in the process of skimming owing to treatment temp, various reasons such as misoperation inevitably can be taken a small amount of molten iron out of, these and slag blended iron, often handle as steel scrap, can not get good utilization, but its S content is lower, and remaining more Mg, if as the starting material of producing magnesium iron, then having significantly reduced the usage quantity of nodulizing agent in the ductile iron production, even do not needed to carry out in addition spheroidizing, is the desirable feedstock of producing magnesium iron.
The advantage that injection feeding technology is produced magnesium iron is: desulfating and deoxidation is effective, the specific absorption height of nodulizing agent; The quantity of slag is few, the basicity height of slag; Reduced flue dust and the magnesium light in the treating processes; Can realize automatic production.
It is low that the present invention makes full use of in the slag iron S content, the characteristics of remaining more Mg, and nodulizing agent, nucleating agent and ferrosilicon wrapped into heart yearn simultaneously, and carry out nodularization, inoculation, simplified production technique greatly, saved cost.Processing step is as follows:
1, melting, with the melting in induction furnace of slag iron, used its composition range of slag iron is C:2.5～3.9% by mass percentage, Si:0.5～1.3%, Mn:0.3～0.7%, S:0.01～0.1%, P:0.03～0.06%, Mg:0.01～0.035%, surplus is an iron, smelting temperature is 1500～1550 ℃, and smelting time is 30～60min;
2, desulfurization and inoculation are added the CaC of base iron amount 0.7～1.8% in hot metal ladle
2With 1.0～2.5% 75SiFe, molten iron is poured in the hot metal ladle then, carries out desulfurization processing and inoculation, and treatment temp is 1400～1450 ℃, and the time is 8～15min;
3, spheroidizing, adopt line feeding method to carry out spheroidizing, feeding heart yearn when desulfurization and inoculation are near completion, its diameter is 10～16mm, nodulizing agent adopts QRMg8RE3, add-on according to the base iron composition is regulated nodulizing agent is generally 0.1～1% of iron water amount, and wire-feeding velocity is 100～200m/min;
4, cast will be poured into a mould through the molten iron after the spheroidizing, promptly obtain spheroidal graphite cast iron, and teeming temperature is 1350～1370 ℃.
The present invention provides a kind of new approach for producing spheroidal graphite cast iron, has made full use of metallurgical waste, and has utilized its Mg content advantage of higher, and produced spheroidal graphite cast iron with simple operation, and this is to waste recycle, and cutting down the consumption of energy has very big meaning.
Description of drawings
The trade mark that Fig. 1 uses the inventive method production is the graphite form figure of QT500-7 spheroidal graphite cast iron;
The trade mark that Fig. 2 uses the inventive method production is the graphite form figure of QT400-15 spheroidal graphite cast iron;
The trade mark that Fig. 3 uses the inventive method production is the graphite form figure of QT700-2 spheroidal graphite cast iron;
Embodiment
Example 1:
Utilize this method to produce the magnesium iron 1t of the trade mark for QT500-7.Melting equipment adopts 450kVA, 1.5t line frequency induction furnace.With the melting in induction furnace of slag iron, used its composition of slag iron is C:3.5% by mass percentage, Si:0.8%, and Mn:0.35%, S:0.033%, P:0.03%, Mg:0.025%, surplus is Fe.Smelting temperature is 1550 ℃, and smelting time is 40min.With 15kgCaC
2Put into the hot metal ladle bottom simultaneously with 17kg75SiFe and treat that molten iron pours.Breed and the desulfurization processing after pouring molten iron, treatment temp is 1430 ℃, and the treatment time is 10min.Adopt hello a silk method to carry out spheroidizing after the inoculation, line feeding equipment is one of single head feeding wire machine, and nodulizing agent adopts QRMg8RE3, and core line diameter is 10mm, and line mass is 169g/m, and wire-feeding velocity is 100m/min, the long heart yearn of feeding 37m.Teeming temperature is 1350 ℃.The yield strength that records magnesium iron is 564MPa, and unit elongation is 8.2%, and the microscopic examination nodulizing grade is 2 grades of (see figure 1)s.
Example 2:
Utilize this method to produce the magnesium iron 1t of the trade mark for QT400-15.Melting equipment adopts 450kVA, 1.5t line frequency induction furnace.With the melting in induction furnace of slag iron, used its composition of slag iron is C:2.8% by mass percentage, Si:0.5%, and Mn:0.45%, S:0.023%, P:0.04%, Mg:0.03%, surplus is Fe.Smelting temperature is 1530 ℃, and smelting time is 30min.With 12kgCaC
2Put into the hot metal ladle bottom simultaneously with 25kg75SiFe and treat that molten iron pours.Breed and the desulfurization processing after pouring molten iron, treatment temp is 1400 ℃, and the treatment time is 8min.Adopt hello a silk method to carry out spheroidizing after the inoculation, line feeding equipment is one of single head feeding wire machine, and nodulizing agent adopts QRMg8RE3, and core line diameter is 12mm, and line mass is 172g/m, and wire-feeding velocity is 120m/min, the long heart yearn of feeding 62m.Teeming temperature is 1360 ℃.The yield strength that records magnesium iron is 520MPa, and unit elongation is 18.5%, and the microscopic examination nodulizing grade is 3 grades of (see figure 2)s.
Example 3:
Utilize this method to produce the magnesium iron 1t of the trade mark for QT700-2.Melting equipment adopts 450kVA, 1.5t line frequency induction furnace.With the melting in induction furnace of slag iron, used its composition of slag iron is C:3.0% by mass percentage, Si:0.9%, and Mn:0.5%, S:0.019%, P:0.03%, Mg:0.022%, surplus is Fe.Smelting temperature is 1500 ℃, and smelting time is 40min.With 7kgCaC
2Put into the hot metal ladle bottom simultaneously with 16kg75SiFe and treat that molten iron pours.Breed and the desulfurization processing after pouring molten iron, treatment temp is 1400 ℃, and the treatment time is 15min.Adopt hello a silk method to carry out spheroidizing after the inoculation, line feeding equipment is one of single head feeding wire machine, and nodulizing agent adopts QRMg8RE3, and core line diameter is 13mm, and line mass is 230g/m, and wire-feeding velocity is 100m/min, the long heart yearn of feeding 48m.Teeming temperature is 1350 ℃.The yield strength that records magnesium iron is 770MPa, and unit elongation is 6.5%, and the microscopic examination nodulizing grade is 2 grades of (see figure 3)s.
Claims (2)
1, a kind of slag iron of taking out of with molten iron pretreatment slag skimming is the method for raw material production spheroidal graphite cast iron, it is characterized in that this method comprises following processing step:
(1) melting, with the melting in induction furnace of slag iron, smelting temperature is 1500～1550 ℃, smelting time is 30～60min;
(2) desulfurization and inoculation are added the CaC of base iron amount 0.7～1.8% in hot metal ladle
275SiFe with 1.0～2.5% pours molten iron in the hot metal ladle into then, carries out desulfurization processing and inoculation, and treatment temp is 1400～1450 ℃, and the time is 8～15min;
(3) spheroidizing, adopt line feeding method to carry out spheroidizing, feeding heart yearn when desulfurization and inoculation are near completion, its diameter is 10～16mm, nodulizing agent adopts QRMg8RE3, add-on according to the base iron composition is regulated nodulizing agent is generally 0.1～1% of iron water amount, and wire-feeding velocity is 100～200m/min;
(4) cast will be poured into a mould through the molten iron after the spheroidizing, promptly obtain spheroidal graphite cast iron, and teeming temperature is 1350～1370 ℃.
2, the slag iron of taking out of with molten iron pretreatment slag skimming according to claim 1 is the method for raw material production spheroidal graphite cast iron, it is characterized in that its composition range of slag iron that described molten iron pretreatment slag skimming is taken out of is C:2.5～3.9% by mass percentage, Si:0.5～1.3%, Mn:0.3～0.7%, S:0.01～0.1%, P:0.03～0.06%, Mg:0.01～0.035%, surplus is an iron.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296140A (en) * | 2011-08-09 | 2011-12-28 | 武汉钢铁(集团)公司 | Method of producing cast iron for auto parts with desulfuration residues |
| CN103084547A (en) * | 2012-12-30 | 2013-05-08 | 哈尔滨东安汽车动力股份有限公司 | Device and method of producing ductile iron casting of camshaft |
| CN106399815A (en) * | 2016-11-18 | 2017-02-15 | 广西大学 | Heat treatment method of boron-phosphorus wear-resistant cast iron |
| CN106399816A (en) * | 2016-11-18 | 2017-02-15 | 广西大学 | Boron-phosphorus wear-resistant cast iron and preparing method thereof |
| CN106566978A (en) * | 2016-10-31 | 2017-04-19 | 广西大学 | Boron containing wear-resisting cast iron and preparation method thereof |
| CN108998617A (en) * | 2018-08-24 | 2018-12-14 | 河北工业大学 | A method of control spheroidal graphite cast-iron Oxygen potential |
-
2008
- 2008-12-30 CN CN200810246930XA patent/CN101445888B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296140A (en) * | 2011-08-09 | 2011-12-28 | 武汉钢铁(集团)公司 | Method of producing cast iron for auto parts with desulfuration residues |
| CN103084547A (en) * | 2012-12-30 | 2013-05-08 | 哈尔滨东安汽车动力股份有限公司 | Device and method of producing ductile iron casting of camshaft |
| CN106566978A (en) * | 2016-10-31 | 2017-04-19 | 广西大学 | Boron containing wear-resisting cast iron and preparation method thereof |
| CN106399815A (en) * | 2016-11-18 | 2017-02-15 | 广西大学 | Heat treatment method of boron-phosphorus wear-resistant cast iron |
| CN106399816A (en) * | 2016-11-18 | 2017-02-15 | 广西大学 | Boron-phosphorus wear-resistant cast iron and preparing method thereof |
| CN108998617A (en) * | 2018-08-24 | 2018-12-14 | 河北工业大学 | A method of control spheroidal graphite cast-iron Oxygen potential |
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Owner name: NORTHEASTEM UNIVERSITY METALLURGICAL TECHNOLOGY IN Free format text: FORMER NAME: METALLURGY TECHNOLOGY RESEARCH INSTITUTE CO., LTD., NORTHEAST UNIVERSITY |
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Address after: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee after: NORTHEASTERN UNIVERSITY METALURGICAL TECHNOLOGY INSTITUTE CO., LTD. Address before: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee before: Metallurgy Technology Research Institute Co., Ltd., Northeast University |
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