CN104878275B - A kind of production technology of high-strength high-elongation ratio iron casting - Google Patents
A kind of production technology of high-strength high-elongation ratio iron casting Download PDFInfo
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- CN104878275B CN104878275B CN201510277135.7A CN201510277135A CN104878275B CN 104878275 B CN104878275 B CN 104878275B CN 201510277135 A CN201510277135 A CN 201510277135A CN 104878275 B CN104878275 B CN 104878275B
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Abstract
The invention discloses a kind of production technology of high-strength high-elongation ratio iron casting, is carried out in the steps below：1. 18 22 parts of smelting scrap steels are added in electric furnace, adds 58 62 parts of foundry returns, the texturizing agents and 18 22 parts of pig iron for being finally simultaneously introduced 0.5 part carry out melting, form base iron；2. nodulizer is added in the nodularization room of nodularization bag, then inovulant is covered on nodulizer, then silicon steel sheet is covered on inovulant, finally texturizing agents are added in nodularization bag；3. temperature control in electric furnace is formed after 1,460 1480 DEG C of base iron is reacted in nodularization bag whole molten iron；4. whole molten iron is poured into casting mold, after cooling, obtains iron casting.The present invention can not only prevent the scaling loss of crystallization nucleation in molten iron, improve molten steel quality, moreover it is possible to greatly improve elongation percentage and intensity.
Description
Technical field
The present invention relates to a kind of production technology of iron casting, particularly a kind of life of high-strength high-elongation ratio iron casting
Production. art.
Background technology
Spheroidal graphite cast-iron is that the graphite in cast iron assumes a kind of spherical cast iron, is formed graphite by spheroidising spherical,
This globular graphite can make stress concentration little, reduce and matrix is isolated.Due to the intensity of spheroidal graphite cast-iron, modeling degree, toughness high, tired
Labor intensity is better than non-alloyed steel close to medium carbon steel, wearability, and cutting ability can be compared favourably with casting pig, and manufacturing cost is low excellent
Point, it are received and are widely applied.
In the production process of spheroidal graphite cast-iron, iron liquid, the quality of iron liquid, ball will can be formed after the melting sources of different ratio
Changing inoculation effect etc. has conclusive effect to the quality of foundry goods.The quality of iron liquid is good, then can form number when solidifying
More, less graphite nodule and eutectic cell is measured, graphite nodule and eutectic cell are more, more tiny, then swelling stress when foundry goods is formed
Bigger, so as to more effectively overcome matrix loose, improve the mechanical property of spheroidal graphite cast-iron.Therefore, the quality of iron liquid with
The quality of final spheroidal graphite cast-iron has a direct relation, the quality of iron liquid again directly with each unit in the proportioning of raw material and raw material
The content of plain chemical constituent has direct relation.Another factor for affecting spheroidal graphite cast-iron quality is nodularization process, at nodularization
The purpose of reason is to make spheroidization of graphite, while except desulfuration and oxygen isoreactivity element.It is well known that the preparation process in spheroidal graphite cast-iron
In, it is desirable to sulfur content is more low better, generally believing that element sulphur is a kind of harmful element, its presence can destroy graphite forming core
Forming process, and then affect the mechanical property etc. of spheroidal graphite cast-iron；In addition, during nodularization, spheroidizing reacion speed and whole ball
The change reaction time decides the absorptivity of magnesium, the roundness of graphite, quantity and distribution situation, and these factors can affect spheroidal graphite to cast
The mechanical property of iron.At present, conventional manufactory when QT600 materials are produced, general elongation percentage can only achieve 5%-7%, though
The regulation elongation percentage standard just qualified more than 3% in GB has so been reached, low performance has been remained at.
Content of the invention
It is an object of the invention to, there is provided a kind of production technology of high-strength high-elongation ratio iron casting.The present invention is not only
The scaling loss of crystallization nucleation in molten iron can be prevented, molten steel quality is improved, moreover it is possible to greatly improve elongation percentage and intensity.
Technical scheme：A kind of production technology of high-strength high-elongation ratio iron casting, feature is, by following steps
Suddenly carry out：
1. 18-22 part smelting scrap steels are added in electric furnace, adds 58-62 part foundry returns, be finally simultaneously introduced 0.5 part
Texturizing agents and 18-22 parts pig iron carry out melting, form base iron；
2. nodulizer is added in the nodularization room of nodularization bag, then inovulant is covered on nodulizer, then by silicon steel
Piece is covered on inovulant, is finally added texturizing agents in nodularization bag；
3. temperature control in electric furnace is poured in 1460-1480 DEG C of base iron and formed after reaction in nodularization bag whole molten iron；
4. whole molten iron is poured into casting mold, after cooling, obtains iron casting.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the quality of each constituent point in the steel scrap
Number is respectively Mn≤0.4%, S≤0.02%, P≤0.04%, balance of Fe.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the quality of each constituent point in the pig iron
Number is respectively C：4.1-4.3%, Si:0.1-0.3%, Mn:0.01-0.03%, P:≤ 0.04, S：≤ 0.015%, Ti:≤
0.02%, balance of Fe.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the quality of each constituent in the nodulizer
Fraction is respectively Mg：5.6-6.2%, AL≤0.8%, Si：0.44-0.48%, Ca:2.85-3.35%, La:0.4-0.6%,
Balance of Fe.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, each constituent in the texturizing agents
Mass fraction is respectively SiC ＞ 95%, Al203＜ 1.5%, C ＜ 3%, remaining are Si and SiO2.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the step 1. in texturizing agents
Grain granularity be 3-8mm, the step 2. middle texturizing agents grain graininess be 0.1-0.5mm.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the inovulant is Si-Ca-Ba inovulant, its
The mass fraction of each constituent is respectively Si:＞ 65%, Ca:1.5-2.5%, Ba：1.0-2.0%, balance of Fe.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the step 2. in, the nodulizer
Addition for base iron weight 1.0%；The addition of the inovulant for base iron weight 0.25%；The silicon steel sheet
Addition for base iron weight 0.5%；The addition of the texturizing agents for base iron weight 0.05%.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the quality of each constituent in the base iron
Fraction is respectively C：3.9-4.0%, Si:1.8-1.9%, Mn:0.45-0.5%, P:≤ 0.05, S≤0.02%, Cu:0.35-
0.4%, Sn:0.03-0.035%, balance of Fe.
In the production technology of aforesaid high-strength high-elongation ratio iron casting, the quality of each constituent in the whole molten iron
Fraction is respectively C：3.75-3.9%, Si:2.35-2.50%, Mn:0.45-0.5%, P:≤ 0.05, S≤0.15%, Cu:
0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, balance of Fe.
Compared with prior art, the pig iron is eventually adding by the present invention in charging, prevents the scaling loss of crystallization nucleation in molten iron,
Molten steel quality is improved, in fusion process and in spheroidizing process, texturizing agents is separately added into, graphite is analysed when promoting nodularization
Go out more more tiny more roundings, so as to improve elongation percentage；The silicone content of base iron is controlled higher (1.8-1.9%), energy also
Elongation percentage is further improved, and elongation percentage can reach 10%-13%.Also by alloy adding control effectively with obtain compared with
High intensity (, up to 645Mpa, yield strength is up to 402Mpa for tensile strength).
Specific embodiment
With reference to embodiment, the present invention is further illustrated, but the foundation for being not intended as limiting the present invention.
Embodiment.A kind of production technology of high-strength high-elongation ratio iron casting, is carried out in the steps below：
1. 18-22 part smelting scrap steels are added in electric furnace, adds 58-62 part foundry returns, be finally simultaneously introduced 0.5 part
Texturizing agents and 18-22 parts pig iron carry out melting, form base iron；
2. nodulizer is added in the nodularization room of nodularization bag, then inovulant is covered on nodulizer, then by silicon steel
Piece is covered on inovulant, is finally added texturizing agents in nodularization bag；
3. temperature control in electric furnace is poured in 1460-1480 DEG C of base iron and formed after reaction in nodularization bag whole molten iron；
4. whole molten iron is poured into casting mold, after cooling, obtains iron casting.
When described base iron is in nodularization bag, base iron is not directly flushed on nodulizer, while measuring nodularization outburst
Time, between 55 seconds to 100 seconds, explanation spheroidizing reacion is qualified.
Reasonable is that the mass fraction of each constituent is respectively Mn≤0.4%, S≤0.02%, P in the steel scrap
≤ 0.04%, balance of Fe.In the pig iron (high-purity pig iron), the mass fraction of each constituent is respectively C：4.1-4.3%,
Si:0.1-0.3%, Mn:0.01-0.03%, P:≤ 0.04, S：≤ 0.015%, Ti:≤ 0.02%, balance of Fe.The ball
In agent, the mass fraction of each constituent is respectively Mg：5.6-6.2%, AL≤0.8%, Si：0.44-0.48%, Ca:
2.85-3.35%, La:0.4-0.6%, balance of Fe.The matter of each constituent in texturizing agents (the also referred to as carborundum)
Amount fraction is respectively SiC ＞ 95%, Al203＜ 1.5%, C ＜ 3%, remaining are Si and SiO2.
The step 1. in texturizing agents grain graininess be 3-8mm, the step 2. middle texturizing agents
Grain granularity is 0.1-0.5mm.The inovulant is Si-Ca-Ba inovulant, and the mass fraction of its each constituent is respectively Si:＞
65%, Ca:1.5-2.5%, Ba：1.0-2.0%, balance of Fe.
The step 2. in, the addition of the nodulizer for base iron weight 1.0%；The addition of the inovulant
Measure 0.25% for base iron weight；The addition of the silicon steel sheet for base iron weight 0.5%；The texturizing agents
Addition for base iron weight 0.05%.
In the base iron, the mass fraction of each constituent is respectively C：3.9-4.0%, Si:1.8-1.9%, Mn:
0.45-0.5%, P:≤ 0.05, S≤0.02%, Cu:0.35-0.4%, Sn:0.03-0.035%, balance of Fe.The whole iron
In water, the mass fraction of each constituent is respectively C：3.75-3.9%, Si:2.35-2.50%, Mn:0.45-0.5%, P:≤
0.05, S≤0.15%, Cu:0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, balance of Fe.
It is preferred that step 2. in, add the 0.05% of weight of tapping a blast furnace texturizing agents (carborundum) half is covered
Cover on silicon steel sheet, second half is added to nodularization room opposite.The pig iron is eventually adding by the present invention in charging, prevents from tying in molten iron
The scaling loss of crystalline form core, improves molten steel quality, in fusion process and is separately added into texturizing agents in spheroidizing process, promotes
Graphite Precipitation more more tiny more roundings during nodularization, so that improve elongation percentage；Also the silicone content of base iron is controlled higher
(1.8-1.9%), elongation percentage further can be improved, and elongation percentage can reach 10%-13%.
The present invention is obtained by experiment：
Can therefrom draw, of the invention when the silicone content of base iron is controlled higher (1.8-1.9%), and and its
It is not only to can guarantee that stronger intensity, moreover it is possible to elongation percentage is substantially improved that his auxiliary material carries out rational proportion, so as to improve product
Energy.
Claims (7)
1. a kind of production technology of high-strength high-elongation ratio iron casting, it is characterised in that carry out in the steps below：
1. 18-22 part smelting scrap steels are added in electric furnace, adds 58-62 part foundry returns, be finally simultaneously introduced 0.5 part of tissue
Modifying agent and 18-22 parts pig iron carry out melting, form base iron；In the steel scrap, the mass fraction of each constituent is respectively Mn
≤ 0.4%, S≤0.02%, P≤0.04%, balance of Fe；In the pig iron, the mass fraction of each constituent is respectively C：
4.1-4.3%, Si:0.1-0.3%, Mn:0.01-0.03%, P:≤ 0.04, S：≤ 0.015%, Ti:≤ 0.02%, balance of
Fe；In the texturizing agents, the mass fraction of each constituent is respectively SiC ＞ 95%, Al203＜ 1.5%, C ＜ 3%, its
Remaining for Si and SiO2；
2. nodulizer is added in the nodularization room of nodularization bag, then inovulant is covered on nodulizer, then silicon steel sheet is covered
Cover on inovulant, finally texturizing agents are added in nodularization bag；
3. temperature control in electric furnace is poured in 1460-1480 DEG C of base iron and formed after reaction in nodularization bag whole molten iron；
4. whole molten iron is poured into casting mold, after cooling, obtains iron casting.
2. the production technology of high-strength high-elongation ratio iron casting according to claim 1, it is characterised in that：The nodularization
In agent, the mass fraction of each constituent is respectively Mg：5.6-6.2%, AL≤0.8%, Si：0.44-0.48%, Ca:2.85-
3.35%, La:0.4-0.6%, balance of Fe.
3. the production technology of high-strength high-elongation ratio iron casting according to claim 1, it is characterised in that：The step
The grain graininess of the texturizing agents in 1. be 3-8mm, the step 2. middle texturizing agents grain graininess be 0.1-
0.5mm.
4. the production technology of high-strength high-elongation ratio iron casting according to claim 1, it is characterised in that：Described breed
Agent is Si-Ca-Ba inovulant, and the mass fraction of its each constituent is respectively Si:＞ 65%, Ca:1.5-2.5%, Ba：1.0-
2.0%, balance of Fe.
5. the production technology of high-strength high-elongation ratio iron casting according to claim 1, it is characterised in that：In the step
Rapid 2. in, the addition of the nodulizer is the 1.0% of base iron weight；The addition of the inovulant is base iron weight
0.25%；The addition of the silicon steel sheet for base iron weight 0.5%；The addition of the texturizing agents is base iron weight
The 0.05% of amount.
6. the production technology of the high-strength high-elongation ratio iron casting according to any one of claim 1-5, it is characterised in that：
In the base iron, the mass fraction of each constituent is respectively C：3.9-4.0%, Si:1.8-1.9%, Mn:0.45-0.5%,
P:≤ 0.05, S≤0.02%, Cu:0.35-0.4%, Sn:0.03-0.035%, balance of Fe.
7. the production technology of the high-strength high-elongation ratio iron casting according to any one of claim 1-5, it is characterised in that：
In the whole molten iron, the mass fraction of each constituent is respectively C：3.75-3.9%, Si:2.35-2.50%, Mn:0.45-
0.5%, P:≤ 0.05, S≤0.15%, Cu:0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, balance of
Fe.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105886693B (en) * | 2016-05-16 | 2017-11-03 | 江苏力源金河铸造有限公司 | A kind of method of smelting of moderate strength high-elongation magnesium iron |
| CN106513650B (en) * | 2016-11-28 | 2019-04-26 | 西峡县西泵特种铸造有限公司 | A kind of briquetting technique preventing nodulizer packet splicing |
| CN107723584A (en) * | 2017-10-18 | 2018-02-23 | 湖州正德轻工机械有限公司 | A kind of hi-strength nodular iron casting |
| CN107699778A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of production method of inexpensive spheroidal graphite cast-iron |
| CN107699786A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of low ductile alloy iron castings |
| CN107475605A (en) * | 2017-10-18 | 2017-12-15 | 湖州正德轻工机械有限公司 | A kind of heat treatment method of hi-strength nodular iron casting |
| CN107755623A (en) * | 2017-10-27 | 2018-03-06 | 湖州正德轻工机械有限公司 | Automobile clutch pressure plate casting method |
| CN111500923A (en) * | 2020-05-20 | 2020-08-07 | 天津三和铁制品有限公司 | Thick-wall nodular cast iron and preparation method thereof |
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| CN101649369A (en) * | 2009-08-28 | 2010-02-17 | 河南省四达仙龙实业有限公司 | Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing |
| CN103882175A (en) * | 2014-03-31 | 2014-06-25 | 江苏力源金河铸造有限公司 | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron |
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| JPS52155119A (en) * | 1976-06-21 | 1977-12-23 | Showa Denko Kk | Silicon carbide additive for cast iron refining |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649369A (en) * | 2009-08-28 | 2010-02-17 | 河南省四达仙龙实业有限公司 | Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing |
| CN103882175A (en) * | 2014-03-31 | 2014-06-25 | 江苏力源金河铸造有限公司 | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron |
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