CN104946842A - Production technology for eliminating carbide at cold iron of nodular iron casting - Google Patents
Production technology for eliminating carbide at cold iron of nodular iron casting Download PDFInfo
- Publication number
- CN104946842A CN104946842A CN201510285649.7A CN201510285649A CN104946842A CN 104946842 A CN104946842 A CN 104946842A CN 201510285649 A CN201510285649 A CN 201510285649A CN 104946842 A CN104946842 A CN 104946842A
- Authority
- CN
- China
- Prior art keywords
- iron
- carbide
- add
- molten iron
- production technique
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a production technology for eliminating carbide at cold iron of nodular iron casting, which comprises the following steps: 1)adding 18-22 parts of scrap steel in an electric furnace for melting, adding 48-52 parts of recycled scrap, finally adding 28-32 parts of pig iron for melting to obtain molten iron, pretreating the molten iron to obtain the raw molten iron; 2)adding a nodulizer in a spheroidizing chamber of a spheroidizing package, covering a low silicon inoculant on the nodulizer, then covering a siliconized plate on the inoculants, and finally adding a tissue modifier in the spheroidizing package; 3)dumpling the raw molten iron in the electric furnace in the spheroidizing package for reacting to form final molten iron; and 4)pouring the final molten iron in a casting mold, adding 0.2-0.7mm of silicon strontium inoculant while casting, and cooling to obtain the nodular iron casting. The production technology can promote the graphite precipitation, prevent the carbide generation and increase the product quality.
Description
Technical field
the present invention relates to a kind of production technique of iron casting, particularly a kind of production technique eliminating G. Iron Castings chill place carbide.
Background technology
spheroidal graphite cast iron is that the graphite in cast iron presents spherical a kind of cast iron, and by spheroidizing, graphite is formed spherical, this globular graphite can make stress concentration little, reduces isolating matrix.Because the intensity of spheroidal graphite cast iron, degree of moulding, toughness are high, fatigue strength is close to medium carbon steel, and wear resistance is better than non-alloyed steel, and cutting ability can compare favourably with graphitic cast iron, the advantages such as low cost of manufacture, and it receives applies widely.
in the production process of spheroidal graphite cast iron, can form iron liquid by after the melting sources of different ratio, the quality, spheroidization and inoculation treatment effect etc. of iron liquid have conclusive effect to the quality of foundry goods.The quality of iron liquid is good, can more, the less graphite pebbles of quantity of formation and eutectic cell when then solidifying, graphite pebbles and eutectic cell more, more tiny, then expansion stress when foundry goods is formed is larger, thus can more effectively overcome matrix and loosen, improve the mechanical property of spheroidal graphite cast iron.Therefore, the quality of iron liquid and the quality of final spheroidal graphite cast iron have direct relation, the quality of iron liquid again directly and in the proportioning of raw material and raw material the content of each element chemistry component have direct relation.The another one factor affecting spheroidal graphite cast iron quality is nodularization process, and the object of spheroidizing makes spheroidization of graphite, simultaneously except desulfuration and oxygen isoreactivity element.
and the producer of routine is when producing high trade mark G. Iron Castings, because iron hydraulic control system is not in place and technological process old stuff, makes chill place easily form carbide, thus affecting quality product.
Summary of the invention
the object of the invention is to, a kind of production technique eliminating G. Iron Castings chill place carbide is provided.The present invention can promote Graphite Precipitation, prevents the generation of carbide, improves the quality of products.
technical scheme of the present invention: a kind of production technique eliminating G. Iron Castings chill place carbide, is characterized in that, carry out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 48-52 part foundry returns, finally add 28-32 part pig iron and carry out melting and obtain molten iron, then molten iron is carried out pre-treatment obtain base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by low silicon inoculant, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. the base iron in electric furnace is poured in nodularization bag and form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, add the silicon strontium nucleating agent of 0.2-0.7mm during casting, after cooling, obtain G. Iron Castings.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, described molten iron pretreatment method is, cast iron melting is warmed up between 1460 ~ 1480 DEG C, molten iron in electric furnace is poured out in 1/3 to hot metal ladle, in electric furnace, add the texturizing agents of 0.2% weight of molten iron, then the molten iron in hot metal ladle is backed in electric furnace, electric furnace is warming up to 1500-1520 DEG C simultaneously, insulation 5-10 minute, obtains base iron.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, in described nodulizing agent, the massfraction of each moiety 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%, and surplus is Fe.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, in described low silicon inoculant, the massfraction of each moiety is respectively Si:25%-35%, Ca:1.5-2.5%, Ba:1.0-2.0%, and surplus is Fe.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, in described texturizing agents, the massfraction of each moiety is respectively SiC > 95%, Al
2
0
3
< 1.5%, C < 3%, all the other are Si+ SiO
2
.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, the granularity of described combined improved dose is 0.1-0.5mm.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, described step 2. in, the add-on of described nodulizing agent is 0.9% of base iron weight; The add-on of described low silicon inoculant is 0.75% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.1% of base iron weight.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, described step 4. in, the add-on of described silicon strontium nucleating agent is 0.1% of whole weight of molten iron.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, in described base iron, the massfraction of each moiety is respectively C:3.95-4.05%, Si:1.6-1.7%, and surplus is Fe.
in the production technique of aforesaid elimination G. Iron Castings chill place carbide, in described whole molten iron, the massfraction of each moiety is respectively C:3.80-3.9%, Si:2.40-2.50%, P :≤0.05, S≤0.15%, Mg:0.03-0.04%, and surplus is Fe.
compared with prior art, the present invention first by adopting hot metal pretreatment technology to coordinate with its formula, thus reduces the condensate depression of molten iron, promotes growth of graphite; Also by by whole molten iron carbon equivalent (cE=C+1/3Si
) control between 4.6-4.75%, promote the precipitation of graphite, prevent the generation of carbide, improve the quality of products; And control the add-on 0.9 of nodulizing agent to control whole molten iron Mg content at 0.3-0.35%, reduce the condensate depression of molten iron; Adopt low silicon inoculant, the consumption of nucleating agent under ensureing the prerequisite that carbon equivalent ce is constant, can be improved; Add the texturizing agents of 0.1% in nodularization bag, reduce condensate depression, promote the growth of graphite; The 0.2-0.7mm silicon strontium nucleating agent of cast employing 0.10%, prevents nodularization and inoculation fade; Thus the carbide at chill place can be eliminated.
Embodiment
below in conjunction with embodiment, the present invention is further illustrated, but not as the foundation limited the present invention.
embodiment.Eliminate a production technique for G. Iron Castings chill place carbide, it is characterized in that, carry out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 48-52 part foundry returns, finally add 28-32 part pig iron and carry out melting and obtain molten iron, then molten iron is carried out pre-treatment obtain base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by low silicon inoculant, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. the base iron in electric furnace is poured in nodularization bag and form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, add the silicon strontium nucleating agent of 0.2-0.7mm during casting, after cooling, obtain G. Iron Castings.
step 2. in, when texturizing agents being added in nodularization bag, preferably the texturizing agents of half amount is covered on silieonized plate, second half amount texturizing agents join opposite, spheroidizing reacion room.
be preferably, described molten iron pretreatment method is, cast iron melting is warmed up between 1460 ~ 1480 DEG C, molten iron in electric furnace is poured out in 1/3 to hot metal ladle, in electric furnace, adding the texturizing agents (preferably adopting granularity to be the texturizing agents of 3-8mm) of 0.2% weight of molten iron (for remaining the weight of molten iron in electric furnace), then the molten iron in hot metal ladle being backed in electric furnace, electric furnace is warming up to 1500-1520 DEG C simultaneously, insulation 5-10 minute, obtains base iron.
preferably, in described nodulizing agent, the massfraction of each moiety 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%, and surplus is Fe.In described low silicon inoculant, the massfraction of each moiety is respectively Si:25%-35%, Ca:1.5-2.5%, Ba:1.0-2.0%, and surplus is Fe.In described texturizing agents, the massfraction of each moiety is respectively SiC > 95%, Al
2
0
3
< 1.5%, C < 3%, all the other are Si+ SiO
2
.
the granularity of described combined improved dose is 0.1-0.5mm.
more optimizedly, described step 2. in, the add-on of described nodulizing agent is 0.9% of base iron weight; The add-on of described low silicon inoculant is 0.75% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.1% of base iron weight.
more optimizedly, described step 4. in, the add-on of described silicon strontium nucleating agent is 0.1% of whole weight of molten iron.
in described base iron, the massfraction of each moiety is respectively C:3.95-4.05%, Si:1.6-1.7%, and surplus is Fe.In described whole molten iron, the massfraction of each moiety is respectively C:3.80-3.9%, Si:2.40-2.50%, P :≤0.05, S≤0.15%, Mg:0.03-0.04%, and surplus is Fe.
Claims (10)
1. eliminate a production technique for G. Iron Castings chill place carbide, it is characterized in that, carry out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 48-52 part foundry returns, finally add 28-32 part pig iron and carry out melting and obtain molten iron, then molten iron is carried out pre-treatment obtain base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by low silicon inoculant, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. the base iron in electric furnace is poured in nodularization bag and form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, add the silicon strontium nucleating agent of 0.2-0.7mm during casting, after cooling, obtain G. Iron Castings.
2. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, it is characterized in that: described molten iron pretreatment method is, cast iron melting is warmed up between 1460 ~ 1480 DEG C, molten iron in electric furnace is poured out in 1/3 to hot metal ladle, in electric furnace, add the texturizing agents of 0.2% weight of molten iron, then the molten iron in hot metal ladle is backed in electric furnace, electric furnace is warming up to 1500-1520 DEG C simultaneously, insulation 5-10 minute, obtains base iron.
3. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, is characterized in that: in described nodulizing agent, the massfraction of each moiety 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%, surplus is Fe.
4. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, it is characterized in that: in described low silicon inoculant, the massfraction of each moiety is respectively Si:25%-35%, Ca:1.5-2.5%, Ba:1.0-2.0%, surplus is Fe.
5. the production technique of elimination G. Iron Castings chill place according to claim 1 and 2 carbide, is characterized in that: in described texturizing agents, the massfraction of each moiety is respectively SiC > 95%, Al
20
3< 1.5%, C < 3%, all the other are Si+ SiO
2.
6. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, is characterized in that: the granularity of described combined improved dose is 0.1-0.5mm.
7. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, is characterized in that: described step 2. in, the add-on of described nodulizing agent is 0.9% of base iron weight; The add-on of described low silicon inoculant is 0.75% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.1% of base iron weight.
8. the production technique of elimination G. Iron Castings chill place according to claim 1 carbide, is characterized in that: described step 4. in, the add-on of described silicon strontium nucleating agent is 0.1% of whole weight of molten iron.
9. the production technique of the elimination G. Iron Castings chill place carbide according to any one of claim 1-8, it is characterized in that: in described base iron, the massfraction of each moiety is respectively C:3.95-4.05%, Si:1.6-1.7%, surplus is Fe.
10. the production technique of the elimination G. Iron Castings chill place carbide according to any one of claim 1-8, it is characterized in that: in described whole molten iron, the massfraction of each moiety is respectively C:3.80-3.9%, Si:2.40-2.50%, P :≤0.05, S≤0.15%, Mg:0.03-0.04%, surplus is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510285649.7A CN104946842B (en) | 2015-05-29 | 2015-05-29 | A kind of production technology for eliminating carbide at G. Iron Castings chill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510285649.7A CN104946842B (en) | 2015-05-29 | 2015-05-29 | A kind of production technology for eliminating carbide at G. Iron Castings chill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104946842A true CN104946842A (en) | 2015-09-30 |
| CN104946842B CN104946842B (en) | 2017-09-29 |
Family
ID=54161904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510285649.7A Active CN104946842B (en) | 2015-05-29 | 2015-05-29 | A kind of production technology for eliminating carbide at G. Iron Castings chill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104946842B (en) |
Citations (3)
| 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 |
| CN104651704A (en) * | 2013-11-19 | 2015-05-27 | 江苏铭耐合金科技有限公司 | A low-silicon inoculant |
-
2015
- 2015-05-29 CN CN201510285649.7A patent/CN104946842B/en active Active
Patent Citations (3)
| 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 |
| CN104651704A (en) * | 2013-11-19 | 2015-05-27 | 江苏铭耐合金科技有限公司 | A low-silicon inoculant |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104946842B (en) | 2017-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102965567B (en) | Casting thick large-section pearlite nodular cast iron and casting method thereof | |
| CN102796939B (en) | Method for vermicular cast iron by using mixed vermiculizer | |
| CN103290300B (en) | Casting method of thick large section ferrite nodular cast iron | |
| CN104878275A (en) | Production technology for ductile iron casting with high strength and high ductility | |
| CN102676906B (en) | Preparation method of compacted graphite cast iron | |
| CN101748324B (en) | Method for casting super-large centrifugal cold mould by adopting nodular cast iron | |
| CN101519708B (en) | Production method of spheroidal graphite cast iron with high tenacity and corrosion resistance | |
| CN105220058B (en) | Preparation method and application of inoculant for thin-wall quenching part | |
| CN105886693B (en) | A kind of method of smelting of moderate strength high-elongation magnesium iron | |
| CN102071351A (en) | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron | |
| CN102071352A (en) | Vanadium-titanium vermicular cast iron brake drum and preparation method thereof | |
| CN110093554A (en) | It is a kind of to have both high thermal conductivity and high-intensitive vermicular cast iron and the preparation method and application thereof | |
| CN110964974A (en) | As-cast high-strength high-elongation synthetic nodular cast iron and preparation method thereof | |
| CN109402491A (en) | The control method of thick and large section solution strengthening ferrite ductile cast iron increase number of graphite ball | |
| CN102400032A (en) | Large-cross-section nodular cast iron | |
| CN112159922A (en) | Gray cast iron inoculant and preparation method thereof | |
| CN111621689A (en) | Smelting process method for eliminating reverse white cast phenomenon of nodular cast iron | |
| CN101967599B (en) | Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof | |
| KR101822201B1 (en) | High strength flake graphite iron using rare earth element and preparation method thereof | |
| CN105238987A (en) | Preparation method and application of gray pig iron nucleating agent | |
| CN105154760A (en) | Spheroidal graphite cast iron material for truck hub and preparation method of spheroidal graphite cast iron material | |
| CN106811677A (en) | A kind of piston ring carrier cast iron materials and its manufacture method | |
| CN111455263A (en) | Environment-friendly low-temperature nodular cast iron produced by using low-rare earth alloy and production process thereof | |
| CN103343278A (en) | Method for producing gray cast iron for machine | |
| CN103146985A (en) | Inoculant for ferritic nodular cast iron and preparation method of inoculant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |