CN100535155C - Method for producing high-strength gray cast iron - Google Patents
Method for producing high-strength gray cast iron Download PDFInfo
- Publication number
- CN100535155C CN100535155C CNB2007101919117A CN200710191911A CN100535155C CN 100535155 C CN100535155 C CN 100535155C CN B2007101919117 A CNB2007101919117 A CN B2007101919117A CN 200710191911 A CN200710191911 A CN 200710191911A CN 100535155 C CN100535155 C CN 100535155C
- Authority
- CN
- China
- Prior art keywords
- cast iron
- iron
- smear metal
- flux
- raw material
- 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.)
- Expired - Fee Related
Links
Abstract
The invention discloses a production method for a high-strength gray cast-iron, comprising the steps of raw material preparing, feeding, melting, smelting and incubating. Comparing the invention with current technology, waste gray cast-iron is used as the raw material, the high-strength gray cast-iron is produced by electric furnace cycle, the percentage of pass reaches up to 95%, the recycling rate of gray cast-iron cutting scrap is 97%; the resource can be reused, which is environment-friendly, makes full use of resource, and lowers the production cost.
Description
Technical field
The invention belongs to the production method of high-strength gray cast iron, belonging to especially with the gray iron smear metal is the production method of raw material production high-strength gray cast iron.
Background technology
The melting equipment of graphitic cast iron is divided into cupola furnace and electric furnace at present, and electric furnace is mainly induction furnace, comprises main frequency furnace, intermediate frequency furnace, frequency conversion stove.
The graphitic cast iron smear metal usually can not be as the metal charge of cupola furnace, and reason is graphitic cast iron smear metal very easily oxidation under the cupola melting environment, reinforced difficulty, and tiny smear metal falls into low-temperature region in the stove along the coke gap.The molten metal chemical ingredients of institute's melting is extremely unstable, and the rate of recovery is low, and iron liquid oxygen level height, the foundry goods chilling tendency is big, pore is many, iron liquid flowability is poor during cast.
During medium-frequency induction furnace melting graphitic cast iron, no exhaust emission helps environmental protection, good, the iron liquid cleaning of temperature regulation, the condensate depression height, can give full play to the effect of breeding, iron liquid is under electromagnetic action, stir strongly up and down, help composition, temperature even, also help the deoxidation degasification.Utilize night electricity paddy electricity, reduce cost, the graphitic cast iron smear metal is when carrying out melting with medium-frequency induction furnace, and subject matter is that smear metal is difficult for falling, and is big to the furnace lining damage.
Summary of the invention
It is raw material with the gray iron smear metal that technical problem to be solved by this invention provides a kind of, the method for utilizing intermediate frequency sensation electrosmelting to produce HT250, HT300, the high trade mark graphitic cast iron of HT350.
The technical scheme of technical solution problem of the present invention is: the production method of high-strength gray cast iron comprises preparation of raw material operation, charging process, melting process, smelting procedure, breeds operation:
In the preparation of raw material operation, added raw material is: graphitic cast iron smear metal, steel scrap, flux, deslagging agent, nucleating agent, its weight ratio are 80～95: 8～15: 1～4: 0.2～0.6: 0.1～0.3.
In charging process, when going out molten iron, every stove reserves the graphitic cast iron liquid of the 8-10% of furnace volume, add steel scrap earlier, again the graphitic cast iron smear metal is successively added until filling it up with electric furnace, every layer of graphitic cast iron depth of cut is 8～25 centimetres, and in every layer of smear metal, add flux, and stir ash poking case-iron shavings and flux, graphitic cast iron smear metal and flux are drop in the iron liquid.
Described flux is soda ash, lime, glass powder is a kind of or several mixture.
Because the surface-area of graphitic cast iron smear metal is big, big with the air effect area, the graphitic cast iron smear metal is in heat-processed, and tendency to oxidize is big, the flux effect is air-isolation, reduce graphitic cast iron smear metal oxidation, improve slag fluidity, reduce the air content of graphitic cast iron liquid, flux energy and phosphorus, reaction of Salmon-Saxl form slag, thereby can reduce the content of harmful element phosphorus, sulphur in the iron liquid, the thickness of graphitic cast iron smear metal can not be excessive or too small, otherwise can influence the quality of graphitic cast iron.
Disclose by the raw material that contains the graphitic cast iron smear metal is stirred, help raw material to drop in the iron liquid, and increase the graphitic cast iron smear metal degree of packing, to improve burn-off rate.
In melting process, the output rating of adjusting medium-frequency induction furnace is more than 90% of rated output.
Described smelting procedure is: after waiting raw material to liquefy fully, add deslagging agent and cover, be warming up to 1450～1480 ℃, add the good alloy of all kinds of outfits, adjust Chemical Composition to various trade mark necessary requirements, when being warming up to 1480～1520 ℃, molten iron is come out of the stove.
Described deslagging agent is granularity 30～50 purpose perlites.
Deslagging agent is to catch the slag inclusion thing in the iron liquid, reaches the purpose of deoxidation degasification.
The described operation that breeds is: the different situations according to molten iron are determined innoculant adding quantity, and nucleating agent can disposablely be put into casting ladle, also nucleating agent can be added in plug for outlet, along with iron liquid slowly flows into casting ladle.
Described nucleating agent is ferrosilicon, Si-Ba alloy, silicomanganese is a kind of or several mixture.
Whether the used graphitic cast iron smear metal of raw material will carry out pretreatment process according to its clean level decision: described pretreatment process is inhaled for adopting, is blown, screen method is removed dust or sand grains in the smear metal, and purpose is a slag amount when reducing melting, the raising burn-off rate.
The present invention is a raw material with the smear metal of depleted graphitic cast iron compared with prior art, utilizes the high-strength gray iron of electric furnace cyclic production, and product qualification rate reaching is more than 95%, and the graphitic cast iron smear metal rate of recovery is wanted to reach 97%; Resource is reused, both helped environmental protection, made full use of resource again, reduced manufacturing cost.
Embodiment
Below in conjunction with embodiment the present invention is described in detail.
The HT250 that produces of the present invention, HT300, HT350 graphitic cast iron detect according to the GB9439-88 standard.
Described graphitic cast iron smear metal is an example with the smear metal of HT200 trade mark gray iron, and chemical weight composition is C:3.46%Si:1.9%Mn:0.75%.
Described steel scrap chemistry weight composition is C:0.18%Si:0.22%Mn:0.56%.
Embodiment 1:
The production of HT250 graphitic cast iron:
A) preparation of raw material: added raw material is: graphitic cast iron smear metal, steel scrap, flux, deslagging agent: nucleating agent, ferromanganese, its weight ratio are 91: 8.4: 1: 0.3: 0.1: 0.6.
B) charging process: 8% of the reservation furnace volume graphitic cast iron liquid when every stove goes out molten iron, add steel scrap earlier, again the graphitic cast iron smear metal is successively added until filling it up with electric furnace, every layer of graphitic cast iron depth of cut is 8～10 centimetres, and in every layer of smear metal, add glass powder as flux, and stir ash poking case-iron shavings and flux, graphitic cast iron smear metal and flux are drop in the iron liquid, to increase the graphitic cast iron smear metal degree of packing, improve burn-off rate.
C) melting process: the output rating of adjusting medium-frequency induction furnace is 90% of a rated output.
D) smelting procedure: wait after raw material liquefies fully in the medium-frequency induction furnace, adding granularity is that 30～50 purpose perlites cover, and is warming up to 1450～1480 ℃, adds ferromanganese, and when being warming up to 1480～1520 ℃, molten iron is come out of the stove.
E) breed operation: the nucleating agent ferrosilicon is added in plug for outlet, along with iron liquid slowly flows into casting ladle.
Embodiment 1 is detected according to the GB9439-88 standard, and its various technical indicators are as follows: tensile strength 257～289Mpa, hardness HB180～220.
Embodiment 2:
The production of HT300 graphitic cast iron:
A) preparation of raw material: added raw material is: graphitic cast iron smear metal, steel scrap, flux, deslagging agent: nucleating agent, ferromanganese, its weight ratio are 87: 12.2: 0.8: 0.3: 0.2: 0.8.
B) charging process: 9% of the reservation furnace volume graphitic cast iron liquid when every stove goes out molten iron, add steel scrap earlier, again the graphitic cast iron smear metal is successively added until filling it up with electric furnace, every layer of graphitic cast iron depth of cut is 10-15 centimetre, and the mixture that adds soda ash and lime in every layer of smear metal stirs ash poking case-iron shavings and flux as flux, and graphitic cast iron smear metal and flux are drop in the iron liquid, to increase the graphitic cast iron smear metal degree of packing, improve burn-off rate.
C) melting process: the output rating of adjusting medium-frequency induction furnace is 95% of a rated output.
D) smelting procedure: wait after raw material liquefies fully in the medium-frequency induction furnace, adding granularity is that 30～50 purpose perlites cover, and is warming up to 1450～1480 ℃, adds ferromanganese (correctly), and when being warming up to 1480～1520 ℃, molten iron is come out of the stove.
E) breed operation: nucleating agent silicon barium is added in plug for outlet, along with iron liquid slowly flows into casting ladle.
F) whether the used graphitic cast iron smear metal of raw material will carry out pretreatment process according to its clean level decision: described pretreatment process is inhaled for adopting, is blown, screen method is removed dust or sand grains in the smear metal, and purpose is a slag amount when reducing melting, the raising burn-off rate.
Embodiment 2 is detected according to the GB9439-88 standard, and its various technical indicators are as follows: tensile strength 305～341MPa, hardness HB200～230.
Embodiment 3:
The production of HT350 graphitic cast iron:
A) preparation of raw material: added raw material is: graphitic cast iron smear metal, steel scrap, flux, deslagging agent, ferromanganese: nucleating agent, its weight ratio are 84: 15.2: 4: 0.3: 0.3: 0.8.
B) charging process: 9% of the reservation furnace volume graphitic cast iron liquid when every stove goes out molten iron, add steel scrap earlier, again the graphitic cast iron smear metal is successively added until filling it up with electric furnace, every layer of graphitic cast iron depth of cut is 20-25 centimetre, and the mixture that adds soda ash and lime in every layer of smear metal stirs ash poking case-iron shavings and flux as flux, and graphitic cast iron smear metal and flux are drop in the iron liquid, to increase the graphitic cast iron smear metal degree of packing, improve burn-off rate.
C) melting process: the output rating of adjusting medium-frequency induction furnace is 100% of a rated output.
D) smelting procedure: wait after raw material liquefies fully in the medium-frequency induction furnace, adding granularity is that 30～50 purpose perlites cover, and is warming up to 1450～1480 ℃, adds ferromanganese, and when being warming up to 1480～1520 ℃, molten iron is come out of the stove.
E) breed operation: nucleating agent silicomanganese and silicon barium are added in plug for outlet, along with iron liquid slowly flows into casting ladle.
Embodiment 3 is detected according to the GB9439-88 standard, and its various technical indicators are as follows: tensile strength 354～389MPa, hardness HB210～250.
Claims (5)
1, the production method of high-strength gray cast iron is characterized in that: comprise preparation of raw material operation, charging process, melting process, smelting procedure, breed operation:
In the preparation of raw material operation, added raw material is: graphitic cast iron smear metal, steel scrap, flux, deslagging agent, nucleating agent, its weight ratio are 80～95: 8～15: 1～4: 0.2～0.6: 0.1～0.3;
In charging process, when going out molten iron, every stove reserves the graphitic cast iron liquid of the 8-10% of medium-frequency induction furnace capacity, add steel scrap earlier, again the graphitic cast iron smear metal is successively added until filling it up with medium-frequency induction furnace, every layer of graphitic cast iron depth of cut is 8～25 centimetres, and in every layer of smear metal, add flux, and stir ash poking case-iron shavings and flux, graphitic cast iron smear metal and flux are drop in the iron liquid;
In melting process, the output rating of adjusting medium-frequency induction furnace is more than 90% of rated output;
Described smelting procedure is: after waiting raw material to liquefy fully, add deslagging agent and cover, be warming up to 1450～1480 ℃, add the good alloy of all kinds of outfits, adjust the composition of Chemical Composition to the required trade mark, when being warming up to 1480～1520 ℃, molten iron is come out of the stove;
The described operation that breeds is: the different situations according to molten iron are determined innoculant adding quantity, the disposable casting ladle of putting into of nucleating agent, or nucleating agent is added in plug for outlet, along with iron liquid slowly flows into casting ladle.
2, the production method of high-strength gray cast iron according to claim 1 is characterized in that: described flux is soda ash, lime, glass powder is a kind of or several mixture.
3, the production method of high-strength gray cast iron according to claim 1 is characterized in that: described deslagging agent is granularity 30～50 purpose perlites.
4, the production method of high-strength gray cast iron according to claim 1 is characterized in that: described nucleating agent is ferrosilicon, Si-Ba alloy, silicomanganese is a kind of or several mixture.
5, the production method of high-strength gray cast iron according to claim 1 is characterized in that: pre-treatment is carried out in the graphitic cast iron smear metal: described pretreatment process is inhaled for adopting, blows, screen method is removed dust or sand grains in the smear metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101919117A CN100535155C (en) | 2007-12-22 | 2007-12-22 | Method for producing high-strength gray cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101919117A CN100535155C (en) | 2007-12-22 | 2007-12-22 | Method for producing high-strength gray cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101255525A CN101255525A (en) | 2008-09-03 |
| CN100535155C true CN100535155C (en) | 2009-09-02 |
Family
ID=39890619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101919117A Expired - Fee Related CN100535155C (en) | 2007-12-22 | 2007-12-22 | Method for producing high-strength gray cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100535155C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676723B (en) * | 2012-05-08 | 2013-06-26 | 乔永刚 | Method for smelting ash iron by using cupola furnace |
| CN102888485B (en) * | 2012-10-21 | 2013-09-18 | 吉林大学 | Modificator for changing growth morphology of primary austenite of gray cast irons, preparation method and application thereof |
| CN103602879A (en) * | 2013-12-02 | 2014-02-26 | 丹阳市锦雄机械制造有限公司 | Preparation method for high strength gray cast iron material |
| CN105648305B (en) * | 2016-04-18 | 2017-12-01 | 宝鸡市晨瑞鑫铸造有限责任公司 | High-strength gray cast iron material and preparation method thereof |
| CN105950813A (en) * | 2016-06-23 | 2016-09-21 | 含山县清溪德胜铸造厂 | Production process of high-strength bearing gear cast iron |
| CN110093472A (en) * | 2019-04-10 | 2019-08-06 | 芜湖市金贸流体科技股份有限公司 | A kind of gray cast iron production method for high-intensitive valve body |
| CN112226669A (en) * | 2020-08-28 | 2021-01-15 | 江苏衢科轨道交通科技有限公司 | Preparation process of EVO cylinder reinforcing sleeve of train |
-
2007
- 2007-12-22 CN CNB2007101919117A patent/CN100535155C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101255525A (en) | 2008-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101255524B (en) | Method for producing nodular graphite cast iron | |
| CN100535155C (en) | Method for producing high-strength gray cast iron | |
| CN106086608B (en) | A kind of method that low-carbon manganese-silicon is produced using carbon manganese slag | |
| CN103388082B (en) | Production method of crude copper and production device for production of crude copper | |
| KR20130045955A (en) | Method for removing copper in steel scraps | |
| CN103540701A (en) | Smelting process suitable for ultra-high strength gray cast iron | |
| CN103643056B (en) | The smelting process of low carbon ferromanganese | |
| CN106435310B (en) | A kind of technique with grate ferrosilicon process refining manganese silico-aluminum | |
| CN103233094B (en) | Smelting process of high-strength alloy steel | |
| CN107385311B (en) | The method for improving spheroidal graphite cast-iron melt iron degree of purity | |
| CN101570803B (en) | Phosphorous pig iron desulfurizer used for casting pre-roasting anode | |
| CN103643094B (en) | The smelting process of high carbon ferromanganese | |
| CN103361448B (en) | Method of preparing Fe-Ca-Si alloy from melt metallurgical slag | |
| CN102251115B (en) | Method for producing high-carbon manganese-iron alloy from high-alkalinity manganese ore | |
| CN103031409B (en) | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace | |
| CN106467936B (en) | A kind of preparation method of Silcaz | |
| CN110093472A (en) | A kind of gray cast iron production method for high-intensitive valve body | |
| CN102453832A (en) | Preparation method of cast iron | |
| CN103993122A (en) | Converter final slag modifier, preparation method thereof and converter steelmaking method | |
| CN113999948A (en) | Method for eliminating white structure of high-purity pig iron for hydrogen-based smelting reduction casting and pig iron | |
| KR20090059355A (en) | Manufacturing method of ultra low phosphorous and carbon ferromanganese and its product | |
| CN103643057B (en) | The smelting process of mid-carbon fe-mn | |
| CN101545039A (en) | Method for producing ferro-silicon by using a copper smelting waste slag electric stove integral deoxidation and reduction | |
| RU2697129C2 (en) | Method of loading charge into arc electric furnace for steel melting | |
| CN101545040A (en) | Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090902 Termination date: 20161222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |