CN101545023A - Smelting process for producing nodular iron castings by using scrap steel - Google Patents
Smelting process for producing nodular iron castings by using scrap steel Download PDFInfo
- Publication number
- CN101545023A CN101545023A CN200910074244A CN200910074244A CN101545023A CN 101545023 A CN101545023 A CN 101545023A CN 200910074244 A CN200910074244 A CN 200910074244A CN 200910074244 A CN200910074244 A CN 200910074244A CN 101545023 A CN101545023 A CN 101545023A
- Authority
- CN
- China
- Prior art keywords
- steel
- add
- weight ratio
- iron
- spheroidal graphite
- 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.)
- Pending
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 smelting method for producing nodular iron castings by using scrap steel, which comprises: step 1, adding steel into a furnace, adding a carburant on the steel, and then heating the steel so that the steel is melted down and carburized sufficiently; step 2, adding steel again, and adding foundry returns into the furnace; step 3, adding a nodulizer and an inoculant for nodularization and inoculation; and step 4, casting. The method adopts the prior method for smelting the nodular iron castings in an electric furnace and uses the scrap steel to produce the nodular iron castings. The principle of the method is that the main difference between steel and iron is carbon content, and the steel becomes the iron by carburizing to certain degree. The method has the advantages of low cost because the scrap steel is cheaper than nodular pig iron, good quality because the transmissibility of the scrap steel is better than that of the nodular pig iron, two times of specific elongation under the condition of stable tensile strength, and less waste products because the waste products caused by unqualified mechanical property are almost not generated.
Description
Technical field
The present invention relates to a kind of producing spheroidal graphite cast iron from waste steel spare melting method that utilizes.
Background technology
Existing nodular iron casting all is the method that adopts the melting of the spheroidal graphite pig iron.The healthy tissues of existing spheroidal graphite cast iron is that the graphite pebbles of tiny rounding adds the metal substrate, because the nodularization rate of graphite can reach 70%-95%, therefore the mechanical property of spheroidal graphite cast iron is more much higher than graphitic cast iron, tensile strength even can match in excellence or beauty with steel, and plasticity and toughness also improve greatly than graphitic cast iron.
Existing spheroidal graphite cast iron will be strict with its chemical ingredients in fusion process, the production starting material of nodular iron casting are generally the ball pig iron, so cost is higher.And existing society has a large amount of product made from steel to update along with Economic development, and therefore the waste and old mechanical means that reclaims is very many.Simultaneously can produce a large amount of steel tailing, steel in the mill and cut stub bar.If can adopt these steel scraps to make nodular iron casting can greatly reduce cost.
Summary of the invention
At defective that exists in the prior art and deficiency, the objective of the invention is to propose a kind of melting method that utilizes producing spheroidal graphite cast iron from waste steel spare, in steel scrap, add various additives, adopt the melting method of existing spheroidal graphite cast iron electrosmelting, utilize producing spheroidal graphite cast iron from waste steel spare.
In order to achieve the above object, the present invention proposes a kind of producing spheroidal graphite cast iron from waste steel spare melting method that utilizes, comprising:
Step 1, add steel in smelting furnace, and add carburelant on steel, heating makes steel fusing and fully carburizing then;
Step 2, add steel once more, and add foundry returns;
Step 3, adding nodulizing agent, nucleating agent carry out nodularization, inoculation;
Step 4, cast.
Preferred as technique scheme, described method can be specially:
Step 1, to add weight ratio in stove be the steel of 20%-30%, and to add weight ratio on steel be the carburelant of 6%-7%, and heating makes steel fusing and fully carburizing then;
Step 2, add the steel that weight ratio is 20%-30% once more, make the weight ratio of steel reach 40%-60%; And the interpolation weight ratio is the foundry returns of 40%-60%;
Step 3, the nodulizing agent that adds weight ratio 1.3%-2%, the nucleating agent of weight ratio 0.9%-1.2% carry out nodularization, inoculation;
Step 4, cast.
Preferred as technique scheme, described carburelant is a graphite.
Preferred as technique scheme, described nodulizing agent is a rare earth-Si-Fe-Mg.
Preferred as technique scheme, described rare earth-Si-Fe-Mg is FeSiMg
8RE
5
Preferred as technique scheme, described nucleating agent is FeSi
75, FeSiBa.
The present invention proposes a kind of producing spheroidal graphite cast iron from waste steel spare melting method that utilizes, comprising: step 1, add steel in stove, and add carburelant on steel, heating makes steel fusing and fully carburizing then; Step 2, add steel once more, and add foundry returns; Step 3, adding nodulizing agent, nucleating agent carry out nodularization, inoculation; Step 4, cast.The present invention adopts the melting method of existing spheroidal graphite cast iron electrosmelting, utilizes producing spheroidal graphite cast iron from waste steel spare.Principle of the present invention is: it mainly is carbon content that steel and iron do not exist together, and has just become iron to certain dimension for steel carburetting.The invention has the advantages that: cost is low, and the scrap ratio spheroidal graphite pig iron is cheap; Quality is good, and the heredity of steel scrap is better than the spheroidal graphite pig iron; Under the constant situation of tensile strength, unit elongation is doubled.Waste product is few, because the defective waste product that causes of mechanical property has not nearly all had.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
A kind of producing spheroidal graphite cast iron from waste steel spare melting method that utilizes comprises:
Step 1, add steel in smelting furnace, and add carburelant on steel, heating makes steel fusing and fully carburizing then;
Step 2, add steel once more, and add foundry returns;
Step 3, adding nodulizing agent, nucleating agent carry out nodularization, inoculation;
Step 4, cast.
The present invention proposes and a kind ofly produce the melting method of nodular iron casting, make nodular iron casting by carburetting in steel with steel.
Wherein, aforesaid method can be specially:
Step 1, to add weight ratio in stove be the steel of 20%-30%, and to add weight ratio on steel be the carburelant of 6%-7%, and heating makes steel fusing and fully carburizing then;
Step 2, add the steel that weight ratio is 20%-30% once more, make the weight ratio of steel reach 40%-60%; And the interpolation weight ratio is the foundry returns of 40%-60%;
Step 3, the nodulizing agent that adds weight ratio 1.3%-2%, the nucleating agent of weight ratio 0.9%-1.2% carry out nodularization, inoculation;
Step 4, cast.
Wherein, foundry returns is meant cast gate, rising head and the useless part that produces in the production process.Account for 40% generally speaking, Special Circumstances account for 60%.
Wherein the ratio of steel, carburelant, nodulizing agent, nucleating agent can be adjusted according to actual needs, and can be by carrying out after the pre-production
Preferred as technique scheme, described carburelant is a graphite.
Preferred as technique scheme, described nodulizing agent is a rare earth-Si-Fe-Mg.
Preferred as technique scheme, described rare earth-Si-Fe-Mg is FeSiMg
8RE
5
Preferred as technique scheme, described nucleating agent is FeSi
75, FeSiBa.
Certainly; the present invention also can have other embodiment; under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field works as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (6)
1, a kind of producing spheroidal graphite cast iron from waste steel spare melting method that utilizes comprises:
Step 1, add steel in smelting furnace, and add carburelant on steel, heating makes steel fusing and fully carburizing then;
Step 2, add steel once more, and add foundry returns;
Step 3, adding nodulizing agent, nucleating agent carry out nodularization, inoculation;
Step 4, cast.
2, the producing spheroidal graphite cast iron from waste steel spare melting method that utilizes according to claim 1 is characterized in that aforesaid method can be specially:
Step 1, to add weight ratio in stove be the steel of 20%-30%, and to add weight ratio on steel be the carburelant of 6%-7%, and heating makes steel fusing and fully carburizing then;
Step 2, add the steel that weight ratio is 20%-30% once more, make the weight ratio of steel reach 40%-60%; And the interpolation weight ratio is the foundry returns of 40%-60%;
Step 3, the nodulizing agent that adds weight ratio 1.3%-2%, the nucleating agent of weight ratio 0.9%-1.2% carry out nodularization, inoculation;
Step 4, cast.
3, the producing spheroidal graphite cast iron from waste steel spare melting method that utilizes according to claim 1 and 2 is characterized in that, described carburelant is a graphite.
4, the producing spheroidal graphite cast iron from waste steel spare melting method that utilizes according to claim 1 and 2 is characterized in that, described nodulizing agent is a rare earth-Si-Fe-Mg.
5, the producing spheroidal graphite cast iron from waste steel spare melting method that utilizes according to claim 1 and 2 is characterized in that, described rare earth-Si-Fe-Mg is FeSiMg8RE5.
6, the producing spheroidal graphite cast iron from waste steel spare melting method that utilizes according to claim 1 and 2 is characterized in that, described nucleating agent is FeSi75, FeSiBa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910074244A CN101545023A (en) | 2009-04-29 | 2009-04-29 | Smelting process for producing nodular iron castings by using scrap steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910074244A CN101545023A (en) | 2009-04-29 | 2009-04-29 | Smelting process for producing nodular iron castings by using scrap steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101545023A true CN101545023A (en) | 2009-09-30 |
Family
ID=41192399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910074244A Pending CN101545023A (en) | 2009-04-29 | 2009-04-29 | Smelting process for producing nodular iron castings by using scrap steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101545023A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994684A (en) * | 2012-11-28 | 2013-03-27 | 天津市宁河县鑫发工贸有限公司 | Preparation method of scrap steel nodular cast iron |
| CN104561739A (en) * | 2014-12-31 | 2015-04-29 | 芜湖国鼎机械制造有限公司 | Friction-resistant ductile iron as well as preparation method and application thereof |
| CN106638844A (en) * | 2016-10-20 | 2017-05-10 | 合肥海宝节能科技有限公司 | Casting method of water-saving toilet stool blowdown valve |
| CN107385312A (en) * | 2017-07-19 | 2017-11-24 | 济南德嘉机械有限公司 | A kind of production technology of the nodular iron castings of QT500 12 |
| CN108531679A (en) * | 2018-04-19 | 2018-09-14 | 南通冠峰铸造有限公司 | A kind of technique of pure smelting scrap steel magnesium iron and gray iron casting |
-
2009
- 2009-04-29 CN CN200910074244A patent/CN101545023A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994684A (en) * | 2012-11-28 | 2013-03-27 | 天津市宁河县鑫发工贸有限公司 | Preparation method of scrap steel nodular cast iron |
| CN104561739A (en) * | 2014-12-31 | 2015-04-29 | 芜湖国鼎机械制造有限公司 | Friction-resistant ductile iron as well as preparation method and application thereof |
| CN106638844A (en) * | 2016-10-20 | 2017-05-10 | 合肥海宝节能科技有限公司 | Casting method of water-saving toilet stool blowdown valve |
| CN107385312A (en) * | 2017-07-19 | 2017-11-24 | 济南德嘉机械有限公司 | A kind of production technology of the nodular iron castings of QT500 12 |
| CN108531679A (en) * | 2018-04-19 | 2018-09-14 | 南通冠峰铸造有限公司 | A kind of technique of pure smelting scrap steel magnesium iron and gray iron casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103060671B (en) | Ferritic nodular cast iron and preparation thereof | |
| CN101519708B (en) | Production method of spheroidal graphite cast iron with high tenacity and corrosion resistance | |
| CN103484753A (en) | Novel as-cast 500-7 nodular cast iron | |
| CN103131944A (en) | Wear-resistant cast iron piece and preparation method thereof | |
| CN104120332A (en) | High-strength high-toughness ductile cast iron 600-10 and production method thereof | |
| CN103627971B (en) | Large gauge drilling tool structural alloy steel and smelting process thereof | |
| CN101768691B (en) | Productive technology of short flow of structure type cast iron part | |
| CN101545023A (en) | Smelting process for producing nodular iron castings by using scrap steel | |
| CN103088251B (en) | A kind of spheroidal graphite cast iron and heat treating method thereof | |
| CN1317417C (en) | Alloy gray iron material for vehicle covering mould and its preparation method | |
| CN101525719B (en) | Nucleating agent used for producing thin-wall malleable iron component by metal mold | |
| CN103436810A (en) | Production process for steel casting of martensitic wear-resistant steel | |
| CN101265546B (en) | Method for producing spheroidal graphite cast iron from waste steel | |
| CN1313633C (en) | Hard hollow alloy ball iron mould material for vehicle mould and its making method | |
| CN102400032A (en) | Large-cross-section nodular cast iron | |
| CN110964974A (en) | As-cast high-strength high-elongation synthetic nodular cast iron and preparation method thereof | |
| CN104962802A (en) | Inoculation agent for camshaft and preparation method and application thereof | |
| CN101525677A (en) | Production method of high-strength grey cast iron for automobile fittings | |
| CN103290299B (en) | Vanadium-titanium nodular cast iron smelting method | |
| CN103343278B (en) | The production method of gray cast iron for machine | |
| CN103556032A (en) | Method for preparing ultrathin-walled vermicular graphite cast iron | |
| CN104532107A (en) | Vanadium-titanium vermicular cast iron brake drum and manufacture method thereof | |
| CN111455263A (en) | Environment-friendly low-temperature nodular cast iron produced by using low-rare earth alloy and production process thereof | |
| CN105132790A (en) | Vanadium-containing carbidic austempered ductile iron and preparation method thereof | |
| CN115261711A (en) | Silicon solid solution reinforced ferrite nodular cast iron for wind power castings and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090930 |