CN105039631A - Nucleating agent containing rare earth and application of nucleating agent to spheroidal graphite cast iron smelting - Google Patents
Nucleating agent containing rare earth and application of nucleating agent to spheroidal graphite cast iron smelting Download PDFInfo
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- CN105039631A CN105039631A CN201510514049.3A CN201510514049A CN105039631A CN 105039631 A CN105039631 A CN 105039631A CN 201510514049 A CN201510514049 A CN 201510514049A CN 105039631 A CN105039631 A CN 105039631A
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- nucleating agent
- rare earth
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a nucleating agent containing rare earth. The nucleating agent is composed of the following components of the rare earth, lead, antimony, silicon, calcium, magnesium, aluminum and the balance iron and inevitable microelements. Application of the nucleating agent to spheroidal graphite cast iron smelting comprises three times of nucleation. Compared with the prior art, the nucleating agent has the following beneficial effects that the magnesium is added and combined with rare earth elements, so that alloy crystals have the more stable phase in a reaction and cannot be decomposed when coming across moisture or water, and the stability of the alloy crystals do not become poor along with the time; meanwhile, through multiple times of nucleation, mobility of molten iron can be improved, and the deoxidization effect of the molten iron is improved; and meanwhile, the remarkable effect on spherification and ferritiszation of spheroidal graphite is achieved and casting defects caused by much slag and cavity shrinkage can be effectively overcome.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of nucleating agent containing rare earth and the application in spheroidal graphite cast iron is smelted.
Background technology
Rare earth element has special optical, electrical, magnetic and nulcear properties, each element of rare earth all has its characteristic, the particularly distinctive abundant electronic level of rare earth element, the light of its excellence, magnetic, electricity, sound, thermal characteristics can develop the novel material and new unit that have excellent functional performance.
Cast iron is common in a kind of foundry goods and the iron-carbon of widespread use, the new energy of good machinery is obtained for making these foundry goods, in the end a stage obtains iron/graphite-structure to needs, avoid the formation of the iron carbide of the Fe3C form making alloy embrittlement as far as possible, the appearance promoting the graphite when liquid cast iron solidifies is in the object of casting iron technology, cast iron solidification is faster, occur in cast iron that the probability of Fe3C is larger, now need to add the precipitation that nucleating agent promotes graphite crystallization, thus the foundry goods cast iron of thickness smaller part position receives good process, but corresponding graphite pebbles density can increase to some extent, the consistence of infringement casting structure, its mechanicalness and stability is caused to be affected, in order to increase the stability of crystal grain, need to provide one effectively can ensure its stability by nucleating agent.
Summary of the invention
The object of the invention is for existing problem, provide a kind of nucleating agent containing rare earth and the application in spheroidal graphite cast iron is smelted.
The present invention is achieved by the following technical solutions: a kind of nucleating agent containing rare earth, described nucleating agent is grouped into by the one-tenth of following weight percent: rare earths 0.001-0.003%, plumbous 0.015-0.030%, antimony 0.008-0.013%, silicon 58-64%, calcium 6-12%, magnesium 3-5%, aluminium 0.8-1.5%, surplus is iron and inevitable trace element.
As further improvement of these options, the weight percent of described nucleating agent is: rare earths 0.001%, plumbous 0.018%, and antimony 0.008%, silicon 60%, calcium 8%, magnesium 5%, aluminium 1.2%, surplus is iron and inevitable trace element.
As further improvement of these options, the weight percent of described nucleating agent is: rare earths 0.003%, plumbous 0.026%, and antimony 0.012%, silicon 64%, calcium 6%, magnesium 3%, aluminium 0.8%, surplus is iron and inevitable trace element.
As further improvement of these options, the weight percent of described nucleating agent is: rare earths 0.003%, plumbous 0.02%, and antimony 0.01%, silicon 58%, calcium 12%, magnesium 4%, aluminium 1.5%, surplus is iron and inevitable trace element.
As further improvement of these options, the weight ratio of described silicon and iron is greater than 2.
As further improvement of these options, described nucleating agent is by after each raw material pulverizing, and stir 30 minutes in proportion with stirrer, oven dry gets product.
As further improvement of these options, described nucleating agent granularity is 0.8-18 millimeter.
Containing the application of nucleating agent in spheroidal graphite cast iron is smelted for rare earth, comprise three inoculation and obtain spheroidal graphite cast iron:
Inoculation for the first time: when spheroidizing preparation work, in nodularization bag 70% nodulizing agent on covering quality to be equivalent to come out of the stove the 0.17-0.24% of molten iron, granularity is the nucleating agent of 7-12 millimeter, the nodulizing agent of uniform fold residue 30% on nucleating agent, then molten iron of coming out of the stove enters nodularization bag, completes first time inoculation;
Second time inoculation: when molten iron in nodularization bag reaches a half of nodularization bag total volume, spray quality at molten iron surface uniform and to be equivalent to come out of the stove the 0.35-0.5% of molten iron, granularity is the nucleating agent of 15-18 millimeter, completes second time and breeds;
Inoculation for the third time: when casting, add quality with molten iron and be equivalent to molten steel quality 0.12-0.14%, granularity is the nucleating agent of 0.8-1.6 millimeter, completes and breeds for the third time.
The present invention has the following advantages compared to existing technology: after adding magnesium, combine with rare earth element, alloy crystal is made to obtain more stable phase body in the reaction, chance moisture or water all can not decompose, and its stability also can not be deteriorated along with the time, simultaneously through Multi inoculation, the mobility of molten iron can be improved, strengthen its deoxidation effect, simultaneously to promoting the nodularization of spheroidal graphite and ferritizingly having unusual effect, effectively can avoid the casting flaw because many slags and Cause of Shrinkage Void cause.
Embodiment
Embodiment 1:
Weight percent containing the nucleating agent of rare earth is: rare earths 0.001%, plumbous 0.018%, and antimony 0.008%, silicon 60%, calcium 8%, magnesium 5%, aluminium 1.2%, surplus is iron and inevitable trace element.
Embodiment 2:
Weight percent containing the nucleating agent of rare earth is: rare earths 0.003%, plumbous 0.026%, and antimony 0.012%, silicon 64%, calcium 6%, magnesium 3%, aluminium 0.8%, surplus is iron and inevitable trace element.
Embodiment 3:
Weight percent containing the described nucleating agent of rare earth is: rare earths 0.003%, plumbous 0.02%, and antimony 0.01%, silicon 58%, calcium 12%, magnesium 4%, aluminium 1.5%, surplus is iron and inevitable trace element.
In the smelting of spheroidal graphite cast iron, by three inoculation spheroidal graphite cast iron, thus increase mechanicalness and the stability of spheroidal graphite cast iron, the using method of nucleating agent is as follows:
Inoculation for the first time: when spheroidizing preparation work, in nodularization bag 70% nodulizing agent on covering quality to be equivalent to come out of the stove the 0.17-0.24% of molten iron, granularity is the nucleating agent of 7-12 millimeter, the nodulizing agent of uniform fold residue 30% on nucleating agent, then molten iron of coming out of the stove enters nodularization bag, completes first time inoculation;
Second time inoculation: when molten iron in nodularization bag reaches a half of nodularization bag total volume, spray quality at molten iron surface uniform and to be equivalent to come out of the stove the 0.35-0.5% of molten iron, granularity is the nucleating agent of 15-18 millimeter, completes second time and breeds;
Inoculation for the third time: when casting, add quality with molten iron and be equivalent to molten steel quality 0.12-0.14%, granularity is the nucleating agent of 0.8-1.6 millimeter, completes and breeds for the third time.
Adopt the nucleating agent of component in embodiment 1-3, by method in the present invention, spheroidal graphite cast iron is processed, increase control group, use market to commonly use common nucleating agent, main component is Si, and the mating reaction in conjunction with Ca, Ce, S, O completes preparation process, nucleating agent is stated by using method in the present invention for each group in test, molten iron temperature of superheat is 1500 DEG C, and second time inoculation temperature is 1450 DEG C, completes breed for the third time with casting.
The spheroidal graphite cast iron obtained is carried out performance test, show that data logging is as follows:
| Performance index | Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | Fatigue strength (MPa) | Tensile strength |
| Embodiment 1 | 486 | 283 | 12 | 245 | 0.52 |
| Embodiment 2 | 479 | 292 | 13 | 251 | 0.54 |
| Embodiment 3 | 491 | 286 | 11 | 248 | 0.55 |
| Control group | 416 | 225 | 9 | 197 | 0.43 |
Table 1
From table 1, the performance perameter of spheroidal graphite cast iron can draw, its ferritizing successful, and Tensile strength and fatigue property all show excellence, and the matrix of spheroidal graphite cast iron is obvious by nucleating agent effect of optimization.
Spheroidal graphite cast iron detects creep and the creep rupture strength of spheroidal graphite cast iron high temperature respectively under different high temperature after 100 hours and 1000 hours, draw following form:
Table 2
From table 2, data draw, gained spheroidal graphite cast iron tensile strength is comparatively excellent at normal temperatures, in differing temps, increase tensile strength along with the time reduces slowly, say and use spheroidal graphite cast iron creep rupture strength in high temperature that in the present invention, nucleating agent is obtained to keep better, except mechanicalness, the stability of spheroidal graphite cast iron have also been obtained great raising, and effect is comparatively obvious.
Claims (8)
1. the nucleating agent containing rare earth, it is characterized in that, described nucleating agent is grouped into by the one-tenth of following weight percent: rare earths 0.001-0.003%, plumbous 0.015-0.030%, antimony 0.008-0.013%, silicon 58-64%, calcium 6-12%, magnesium 3-5%, aluminium 0.8-1.5%, surplus is iron and inevitable trace element.
2. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, the weight percent of described nucleating agent is: rare earths 0.001%, plumbous 0.018%, antimony 0.008%, silicon 60%, calcium 8%, magnesium 5%, aluminium 1.2%, surplus is iron and inevitable trace element.
3. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, the weight percent of described nucleating agent is: rare earths 0.003%, plumbous 0.026%, antimony 0.012%, silicon 64%, calcium 6%, magnesium 3%, aluminium 0.8%, surplus is iron and inevitable trace element.
4. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, the weight percent of described nucleating agent is: rare earths 0.003%, plumbous 0.02%, antimony 0.01%, silicon 58%, calcium 12%, magnesium 4%, aluminium 1.5%, surplus is iron and inevitable trace element.
5. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, the weight ratio of described silicon and iron is greater than 2.
6. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, described nucleating agent is by after each raw material pulverizing, and stir 30 minutes in proportion with stirrer, oven dry gets product.
7. a kind of nucleating agent containing rare earth as claimed in claim 1, it is characterized in that, described nucleating agent granularity is 0.8-18 millimeter.
8. a kind of application of nucleating agent in spheroidal graphite cast iron is smelted containing rare earth as claimed in claim 1, is characterized in that, comprise three inoculation and obtain spheroidal graphite cast iron:
Inoculation for the first time: when spheroidizing preparation work, in nodularization bag 70% nodulizing agent on covering quality to be equivalent to come out of the stove the 0.17-0.24% of molten iron, granularity is the nucleating agent of 7-12 millimeter, the nodulizing agent of uniform fold residue 30% on nucleating agent, then molten iron of coming out of the stove enters nodularization bag, completes first time inoculation;
Second time inoculation: when molten iron in nodularization bag reaches a half of nodularization bag total volume, spray quality at molten iron surface uniform and to be equivalent to come out of the stove the 0.35-0.5% of molten iron, granularity is the nucleating agent of 15-18 millimeter, completes second time and breeds;
Inoculation for the third time: when casting, add quality with molten iron and be equivalent to molten steel quality 0.12-0.14%, granularity is the nucleating agent of 0.8-1.6 millimeter, completes and breeds for the third time.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908060A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | Iron casting inoculant |
| CN107686933A (en) * | 2017-09-06 | 2018-02-13 | 浙江杭机铸造有限公司 | A kind of spheroidal graphite cast-iron production method and its spheroidal graphite cast-iron of preparation |
| CN107881369A (en) * | 2017-10-27 | 2018-04-06 | 大唐东北电力试验研究所有限公司 | Aluminium calcium antimony intermediate alloy inovulant and preparation method thereof |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN114653902A (en) * | 2022-04-19 | 2022-06-24 | 江苏亚峰合金材料有限公司 | Environment-friendly casting inoculant containing rare earth elements |
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| CN1410190A (en) * | 2001-10-08 | 2003-04-16 | 叶正贤 | Hollow ball plug and its making method |
| CN103484753A (en) * | 2013-09-02 | 2014-01-01 | 宁波康发铸造有限公司 | Novel as-cast 500-7 nodular cast iron |
| WO2014076404A1 (en) * | 2012-11-14 | 2014-05-22 | Ferropem | Inoculant alloy for thick cast-iron parts |
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2015
- 2015-08-20 CN CN201510514049.3A patent/CN105039631A/en active Pending
Patent Citations (5)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908060A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | Iron casting inoculant |
| CN107686933A (en) * | 2017-09-06 | 2018-02-13 | 浙江杭机铸造有限公司 | A kind of spheroidal graphite cast-iron production method and its spheroidal graphite cast-iron of preparation |
| CN107881369A (en) * | 2017-10-27 | 2018-04-06 | 大唐东北电力试验研究所有限公司 | Aluminium calcium antimony intermediate alloy inovulant and preparation method thereof |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN114653902A (en) * | 2022-04-19 | 2022-06-24 | 江苏亚峰合金材料有限公司 | Environment-friendly casting inoculant containing rare earth elements |
| CN114653902B (en) * | 2022-04-19 | 2024-03-22 | 江苏亚峰合金材料有限公司 | Environment-friendly casting inoculant containing rare earth elements |
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Application publication date: 20151111 |