CN100584960C - Method for decreasing titan content in molten ductile iron - Google Patents
Method for decreasing titan content in molten ductile iron Download PDFInfo
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- CN100584960C CN100584960C CN200810055409A CN200810055409A CN100584960C CN 100584960 C CN100584960 C CN 100584960C CN 200810055409 A CN200810055409 A CN 200810055409A CN 200810055409 A CN200810055409 A CN 200810055409A CN 100584960 C CN100584960 C CN 100584960C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for reducing the titanium content in ductile iron liquid iron. Firstly, through analyzing chemical constituents in the ductile iron liquid iron, a nitride with the corresponding volume is added into the liquid iron according to the titanium content of the liquid iron if the titanium content exceeds standard, the nitrogen and titanium can have the metallurgical reaction fully, then the liquid iron is cast into a refining ladle for the refining treatment of argon gas blowing, finally the up-floating titanium nitride is eliminated, namely, the titanium content of the liquid iron reaches the qualified range. Secondly, high quality scrap steel is added into a melting furnace in proportion according to the titanium content of liquid iron, and the titanium content of liquid iron is reduced by dilution. The method utilizes the strong affinity between nitrogen and titanium to change the titanium in the liquid iron into solid titanium nitride which can float upward to the surface of the liquid iron, thereby eliminating the titanium nitride. Other elements of the nitride selected in the invention has no adverse effect on the performance of ductile iron after being added with the ductile iron liquid iron, on the contrary, can also further increase the mechanical performance indexes of ductile iron such as strength. The method for reducing the titanium content of liquid iron through adding scrap steel to dilute the liquid iron has advantages of simple process and convenient operation, and is particularly applied to the mass production.
Description
Technical field
The present invention relates to a kind of method that reduces titaniferous amount in the iron liquid, especially a kind of method that reduces spheroidal graphite cast iron with iron liquid titaniferous amount.
Background technology
Spheroidal graphite cast iron is a kind of iron-carbon, and is approaching with steel so the intensity of spheroidal graphite cast iron is higher because the graphite in the spheroidal graphite cast iron is spherical, have advantages of good casting again simultaneously, so spheroidal graphite cast iron used very extensive.Its production method is fairly simple, is about to satisfactory starting material and forms iron liquid with cupola furnace or furnace melting, again through nodularization, inoculation, treats that its cooled and solidified has just obtained spheroidal graphite cast iron later on.Though it is it is fairly simple to produce the technology of spheroidal graphite cast iron, relatively stricter when producing to raw-material requirement.The factor of nodularization rate that influences spheroidal graphite cast iron is a lot, is exactly one of them as the influence of alloying element.The element that wherein helps nodularization is called the nodularization element, and they comprise an amount of magnesium, rare earth, calcium etc.The element that is unfavorable for nodularization is called tension-active element, and tension-active element comprises sulphur, titanium, boron, aluminium, bismuth, antimony, tin, arsenic etc., and their content is in some thousandths of to ten thousand/what time, will destroy the spheroidization of nodularization element.For guaranteeing the graphite crystallization glomeration in the spheroidal graphite cast iron, must strictly control raw-material chemical ingredients, tension-active element wherein is controlled in the rationally low scope.The anti-spheroidization of sulphur and titanium is the most obvious in tension-active element.The existing proven technique of the problem that present sulphur content exceeds standard can solve, and the technology that solution titaniferous amount exceeds standard is not appeared in the newspapers.Find that through experiment the titaniferous amount is spheroidal graphite cast iron proper scope of nodularization smoothly less than 0.07%, if the titaniferous amount greater than 0.07%, decaying spheroidisation will occur, just graphite pebbles makes a variation, thereby causes the graphite in the cast iron can not nodularization.Therefore, the starting material that production spheroidal graphite cast iron is used all are special-purpose, such as the special-purpose pig iron, coke etc.
But owing to pig iron strained market supply at present, price increase, cause a lot of foundry enterprises to can't buy the special-purpose pig iron of the satisfactory spheroidal graphite cast iron of quality, also will continue but produce, the pig iron of buying can't be ensured the quality of products at random on market; The sulphur content and the exceeding standard of titaniferous amount of sensitivity are modal defective factors the most to the spheroidal graphite cast iron quality influence in the pig iron, and the non-constant of nodularization effect of the spheroidal graphite cast iron that the starting material that exceed standard with this sulphur content or titaniferous amount are produced often makes foundry goods not require to scrap because of nodularization rate or nodulizing grade reach.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that can reduce titaniferous amount in the ductile iron liquid.
For addressing the above problem, the technical solution adopted in the present invention is:
Reduce the method for titaniferous amount in the ductile iron liquid, will through the induction furnace melting or through the ductile iron liquid of cupola furnace-induction furnace double melting, through both analysis, determine whether chemical ingredients is qualified, if the titaniferous amount in the iron liquid exceeds standard, promptly reach more than or equal to 0.07% to the time, then take following way to be reduced or remove titanium in the iron liquid smaller or equal to 0.15% scope.
One of method
According to what of iron liquid titaniferous amount, in iron liquid, add the nitride of respective amount, these nitride comprise nitrided ferro-chromium or nitrogenize ferromanganese or ferro-silicon nitride or silicon nitride ferromanganese etc.Can only add the wherein a kind of of above-mentioned nitride, also can or will add simultaneously after the two or more mixing two kinds.Utilize intensive avidity between nitrogen and the titanium like this, make the titanium in the iron liquid generate titanium nitride.Because the fusing point of titanium nitride is 2950 ℃, is higher than the temperature of ductile iron liquid, the density of titanium nitride is low simultaneously is 5.43g/cm
3, titanium nitride under the blowing argon gas purified condition can on float to the surface of iron liquid, thereby it is got rid of, reach the purpose that reduces iron liquid titaniferous amount.
The concrete operating method of aforesaid method is that nitride is put into induction furnace, make nitrogen and titanium that metallurgical reaction fully take place, pour into iron liquid in the refining bag afterwards and carry out the blowing argon gas refining treatment, again will on float to iron liquid surface titanium nitride assemble with poly-slag agent and get rid of.The titaniferous amount of iron liquid was at 〉=0.07%～≤ 0.15% o'clock, can be divided into the nitride that four sections add different amounts respectively, at titanium content is to add nitrided ferro-chromium (containing N8～10%) 0.1% at 〉=0.07%～≤ 0.09% o'clock at least, at titanium content is to add nitrided ferro-chromium 0.18% at＞0.09%～≤ 0.11% o'clock at least, at titanium content is to add nitrided ferro-chromium 0.28% at＞0.11%～≤ 0.13% o'clock at least, is to add nitrided ferro-chromium 0.36% at＞0.13%～≤ 0.15% o'clock at least at titanium content.Can convert in the ratio that adds nitrided ferro-chromium when adding other nitride, be iron liquid the titaniferous amount respectively 〉=0.07%～≤ 0.09%,＞0.09%～≤ 0.11%,＞0.11%～≤ 0.13%,＞during 0.13%～≤ 0.15% scope, then the nitrogen content in the nitride of Jia Ruing is at least iron liquid respectively
Two of method
After chemically examining the titaniferous amount of determining in the iron liquid, what of iron liquid titaniferous amount in induction furnace, to add the high-quality steel scrap in proportion according to, the method by dilution reaches the purpose that reduces iron liquid titaniferous amount.Treat that steel scrap all carries out chemical analysis one time after the fusing again, determine that iron liquid titaniferous amount is qualified after, add chemical ingredients that alloy such as carburelant adjusts the iron liquid to meeting the requirements, enter spheroidal graphite cast iron production processes such as normal spheroidization and inoculation processing then.
If the titaniferous amount in the iron liquid was at 〉=0.07%～≤ 0.15% o'clock, equally also be divided into the high-quality steel scrap that four sections add different amounts respectively, the add-on of high-quality steel scrap is at least 30% of original iron liquid when the titaniferous amount in the iron liquid is 〉=0.07%～≤ 0.09%, the add-on of high-quality steel scrap is at least 60% of original iron liquid when the titaniferous amount in the iron liquid is＞0.09%～≤ 0.11%, and the add-on of high-quality steel scrap is at least 90% of original iron liquid when the titaniferous amount in the iron liquid is＞0.11%～≤ 0.13%, the add-on of high-quality steel scrap is at least 120% of original iron liquid when the titaniferous amount in the iron liquid is＞0.13%～≤ 0.15%.
Because the remarkable technical progress of having adopted technique scheme, the present invention to obtain is:
Reducing the titaniferous amount of iron liquid by the method that adds nitride in iron liquid, is an invention of field of metallurgy.It utilizes intensive avidity between nitrogen and the titanium, make titanium in the iron liquid generate that fusing point is higher than iron liquid and density less than the solid titanium nitride of iron liquid, and on float to the surface of iron liquid, thereby it is got rid of, make titanium content in the spheroidal graphite cast iron reach the requirement of nodularization.The add-on of nitride is to calculate through science, and the data through obtaining after the practice correction, can be directly used in to instruct and produce.In addition, other element in the selected nitride of the present invention can not cause disadvantageous effect to the performance of spheroidal graphite cast iron after adding ductile iron liquid, on the contrary, can also further improve the mechanical performance indexs such as intensity of spheroidal graphite cast iron.
Reduce the titaniferous amount of iron liquid by the way of adding steel scrap dilution iron liquid, method is simple, and is easy to operate.Add-on provided by the present invention obtains through scientific experimentation, thereby has avoided blindness.This kind method is particularly useful in the middle of the large batch of production.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail:
Embodiment 1
The ductile iron liquid of induction furnace fusing, analyze through the stokehold rapid chemical, determine that its titaniferous amount is 0.12%, the nitrided ferro-chromium that will be equivalent to iron liquid weight 0.28% in the stove is put in the induction furnace, make nitrogen and titanium that metallurgical reaction fully take place, then iron liquid is poured in the refining bag, and carry out the blowing argon gas refining, add poly-slag agent simultaneously in the refining bag, the titanium nitride particles that reaction is generated fully floats and gets rid of.And then, determine that its titaniferous amount is 0.05% through a chemical analysis, enter spheroidal graphite cast iron production processes such as normal spheroidization and inoculation processing this moment.
Embodiment 2
Ductile iron liquid with cupola furnace-induction furnace duplex fusing, determine that through stokehold rapid chemical analysis its titaniferous amount is 0.08%, in the iron liquid of induction furnace, add the high-quality steel scrap that is equivalent to iron liquid weight 30% this moment, carry out melting again, make original iron melt obtain dilution, this moment, the titaniferous amount of iron liquid reached＜0.07% acceptability limit.Treat that steel scrap all carries out chemical analysis one time after the fusing again, determine that iron liquid titaniferous amount is qualified after, add alloys such as carburelant, the chemical ingredients of adjusting iron liquid enters spheroidal graphite cast iron production processes such as normal spheroidization and inoculation processing then to meeting the requirements.
Embodiment 3
The batch process task of oil-well rig gear has been accepted by certain Foundry Inc..This gear belongs to thick and large casting, the specification of quality height.Sometimes the situation that occurs decaying spheroidisation in the production causes than large economy to enterprise and to lose.After determine by analysis owing to the iron liquid titaniferous amount reason that exceeds standard causes.Therefore in the production afterwards, take titaniferous amount in the stokehold chemical examination iron liquid, titaniferous amount as a certain stove is 0.14%, in the iron liquid of induction furnace, add the high-quality steel scrap that is equivalent to iron liquid weight 120% this moment, make original iron melt obtain dilution, the titaniferous amount of iron liquid is 0.06% after melting once more, adds alloy such as carburelant this moment again and adjust other chemical ingredients to qualified in the iron liquid of induction furnace, enters spheroidal graphite cast iron production processes such as normal spheroidization and inoculation processing then.By this method, solved the decaying spheroidisation problem that iron liquid titaniferous amount exceeds standard and causes well, the foundry goods tissue is met the requirements.
Embodiment 4
Present embodiment is another solution of taking in the production of embodiment 3.The titaniferous amount of the iron liquid through chemically examining a certain stove is 0.15%, to be equivalent to 0.40% the nitrided ferro-chromium of iron liquid weight in the stove and the mixture of nitrogenize ferromanganese this moment puts in the induction furnace, after treating that its metallurgical process is fully carried out, iron liquid is poured in the refining bag, and carrying out the blowing argon gas refining, the titanium nitride particles that reaction is generated fully floats and assembles eliminating with poly-slag agent.And then through a chemical analysis, determine that its titaniferous amount is qualified after, enter spheroidal graphite cast iron production processes such as normal spheroidization and inoculation processing.By this method, also solved the decaying spheroidisation problem that iron liquid titaniferous amount exceeds standard and causes well.
Claims (2)
1, reduce the method for titaniferous amount in the ductile iron liquid, comprise the chemical ingredients of analyzing ductile iron liquid, it is characterized in that: if the titaniferous amount exceeds standard, reach the scope that arrives smaller or equal to 0.15% more than or equal to 0.07%, the nitride what of iron liquid titaniferous amount then in iron liquid, to add respective amount according to, nitride comprises nitrided ferro-chromium or nitrogenize ferromanganese or ferro-silicon nitride or silicon nitride ferromanganese, make nitrogen and titanium that metallurgical reaction fully take place, then iron liquid is poured into and carry out the blowing argon gas refining treatment in the refining bag, at last the titanium nitride of come-up is got rid of, the titaniferous amount of iron liquid promptly reaches acceptability limit.
2, the method for titaniferous amount in the reduction ductile iron liquid according to claim 1, the add-on that it is characterized in that described nitride is: the titaniferous amount of iron liquid respectively 〉=0.07%～≤ 0.09%,＞0.09%～≤ 0.11%,＞0.11%～≤ 0.13%,＞during 0.13%～≤ 0.15% scope, then the nitrogen content in the nitride of Jia Ruing is respectively iron liquid
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810055409A CN100584960C (en) | 2008-07-15 | 2008-07-15 | Method for decreasing titan content in molten ductile iron |
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| CN200810055409A CN100584960C (en) | 2008-07-15 | 2008-07-15 | Method for decreasing titan content in molten ductile iron |
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| CN101333577A CN101333577A (en) | 2008-12-31 |
| CN100584960C true CN100584960C (en) | 2010-01-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101984086A (en) * | 2010-11-17 | 2011-03-09 | 河北科技大学 | Method for reducing titanium content in molten nodular cast iron |
| CN110283950A (en) * | 2019-08-05 | 2019-09-27 | 安徽工业大学 | Method for removing titanium in furnace during a kind of blast furnace process high-purity pig iron |
| CN110283952A (en) * | 2019-08-05 | 2019-09-27 | 安徽工业大学 | A kind of blast furnace process high-purity pig iron molten iron nitrogen promoter and increasing method for nitrogen |
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Non-Patent Citations (2)
| Title |
|---|
| 球墨铸铁管中Ti成分控制试验研究. 李栓紧，李德友，王海玲.河南冶金，第13卷第5期. 2005 |
| 球墨铸铁管中Ti成分控制试验研究. 李栓紧，李德友，王海玲.河南冶金，第13卷第5期. 2005 * |
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Assignee: Beijing Times Ruizhi Technology Trade Co.,Ltd. Assignor: Hebei University of Science and Technology Contract record no.: 2012990000009 Denomination of invention: Method for decreasing titan content in molten ductile iron Granted publication date: 20100127 License type: Exclusive License Open date: 20081231 Record date: 20120109 |
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