CN1059364C - Pouring protective slag for electric slag centrifugal casting - Google Patents
Pouring protective slag for electric slag centrifugal casting Download PDFInfo
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- CN1059364C CN1059364C CN95110010A CN95110010A CN1059364C CN 1059364 C CN1059364 C CN 1059364C CN 95110010 A CN95110010 A CN 95110010A CN 95110010 A CN95110010 A CN 95110010A CN 1059364 C CN1059364 C CN 1059364C
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- slag
- electric
- weight percentage
- blast furnace
- centrifugal casting
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- Manufacture Of Iron (AREA)
Abstract
The present invention discloses pouring protective slag for electric slag centrifugal castings, which is composed of the following components of a compounding ratio by weight percentage: 65 to 70 of blast furnace granulating slag, 15 to 20 of fluorite and 15 to 20 of industrial pure soda, wherein the blast furnace granulating slag has the following components by weight percentage: 34 to 37 of CaO, 38 to 47 of SiO2, 8 to 10 of MgO and 8 to 12 of Al2O3. The present invention has the characteristics of low melting temperature, small heat conduction coefficient, low oxidizability, etc. and can be widely applied to electric slag metallurgical technologies in steel plants.
Description
The present invention relates to the electroslag metallurgy technical field, particularly a kind of pouring protective slag for electric slag centrifugal casting.
Centrifugal electroslag casting is the new technology of the eighties by the electric welding research institute invention of Ukraine's crust.It is applicable to the various black and the non-ferrous casting of production lopps, cover class, tubing band hollow.Be the molten steel that will have the refining of lining electroslag furnace to go out, the band slag is poured into coagulation forming in the centrifugal casting machine.Because whole foundry goods is that dynamic solidification forms under the protection of slag.Therefore, the strand of acquisition not only surface quality is good, and dense internal organization, and its performance reaches with steel grade forging level, and production process is simplified, and cost reduces.Studies show that slag plays a crucial role to the casting solidification quality.Yet cast at present is to utilize the slag that the molten refining of lining electroslag is arranged with slag, because the effect of slag is heating and refining during melting, and its effect is moulding, insulation etc. when pouring into a mould.Therefore, obviously different to the slag performance requirement between the two, in existing technology,, bring up to the slag temperature more than 1800 ℃, though this method has satisfied the needs of slag crust moulding when pouring into a mould in order to make slag when pouring into a mould, good flowability be arranged, but slag Wen Taigao has not only aggravated the etch of slag to furnace lining, increase power consumption, and made molten steel temperature raise, increased the air-breathing of molten steel, also strengthened simultaneously thermal shock, and too high liquid steel temperature has increased the tendency of cast(ing) surface crackle to mould.Because the smelting slag fusing point is very high, make that cast back cast outer surface slag crust is too thick in addition, influenced surface quality and heat transfer, foundry goods inner surface slag premature solidification has influenced the discharge of foundry goods pernicious gas and the removal of non-metallic inclusion simultaneously.Therefore, utilizing smelting slag is irrational as pouring protective slag for electric slag centrifugal casting.
In view of the deficiency that the covering slag prior art exists, it is low to the purpose of this invention is to provide a kind of oxidisability, and thermal conductivity factor is little, and viscosity number is little, the pouring protective slag for electric slag centrifugal casting that fusion temperature is low.
For achieving the above object, the present invention is achieved by the following technical solutions.
Covering slag is made up of blast furnace granulated slag, fluorite and calcined soda for industry.Its content proportioning is by weight percentage: 65-70%: 15-20%: 15-20%.
The blast furnace granulated slag main component is: CaO, SiO
2, MgO, Al
2O
3, compositions in weight percentage:
CaO，38-47％∶SiO
2，34-37％∶MgO，8-10％∶Al
2O
3，8-12％。
Blast furnace granulated slag is the refuse of blast furnace ironmaking, is mainly used in cement raw material at present, and price is very cheap, and quantity is many, is characterized in that basicity is low, thereby slag character is tending towards long slag, and also low about 1320 ℃ of fusion temperatures, good heat insulating.Iron oxide is low in the slag, and the impurity element phosphorus content is low, thereby is applicable to the base-material of making covering slag.Adding fluorite and calcined soda for industry has been the flux effect, can reduce the fusion temperature and the viscosity of covering slag.
Its preparation method is: 1, solid slag, with above-mentioned several raw materials mixing of weighing in proportion, in graphite crucible, to give moltenly with electroslag furnace, and cooling back fragmentation is ground to below 100 orders, and adds 100 gram ferrosilicon powders (75%Si) and mix in the per kilogram slag charge.The protection quantity of slag is the 3-5% of molten steel weight when using, and earlier slag charge is placed in the mould, and the molten steel that reinjects carries out centrifugal casting.
2, liquid slag will be the slag of molten steel weight 5-8%, be melted to 1550 ℃ in graphite crucible, water earlier to water molten steel behind the slag and carry out centrifugal casting.
The present invention compared with prior art has following advantage:
1, be generally 1000-1200 ℃ because oxidisability is low, fusion temperature is low, interfacial tension is big between slag and the metal, and thermal conductivity factor is little, therefore, significantly improve the foundry goods internal soundness, dense internal organization, no slag inclusion, pore, gross imperfections such as shrinkage cavity, mechanical performance can reach with steel grade forging level.Form even slag crust in cast outer surface, the bright and clean electroslag remelting level that reaches of this cast(ing) surface.
2,, therefore can not produce any harmful effect, thereby lining durability is long to the furnace lining that the lining electroslag furnace is arranged because the cast covering slag is formulated separately outside stove.
The embodiment of the invention below is provided.
Embodiment one:
Covering slag is by blast furnace granulated slag, and fluorite and calcined soda for industry are formed.Its proportioning is by weight percentage: 65: 20: 15, the blast furnace granulated slag main component was: CaO, SiO
2, MgO, Al
2O
3, its compositions in weight percentage is: 34: 44: 10: 12.
Embodiment two:
The covering slag component is with embodiment one, and the basigamy ratio is for by weight percentage: 70: 15: 15:
The blast furnace granulated slag main component is: CaO, SiO
2, MgO, Al
2O
3, its compositions in weight percentage is 37: 47: 8: 8.
Embodiment three:
The covering slag component is with embodiment one, and its proportioning is 68: 15: 17 by weight percentage.
The blast furnace granulated slag main component is: CaO, SiO
2, MgO, Al
2O
3, its compositions in weight percentage is: 35: 45: 8: 12.
Claims (1)
1, a kind of pouring protective slag for electric slag centrifugal casting; it is characterized in that: covering slag is made up of blast furnace granulated slag, fluorite and calcined soda for industry; its proportioning is by weight percentage: 65～70%: 15～20%: 15～20%, and the blast furnace granulated slag main component is CaO, SiO
2, MgO, AL
2O
3, its components based on weight percentage is: 34～37%: 38～47%: 8～10%: 8～12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110010A CN1059364C (en) | 1995-01-17 | 1995-01-17 | Pouring protective slag for electric slag centrifugal casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110010A CN1059364C (en) | 1995-01-17 | 1995-01-17 | Pouring protective slag for electric slag centrifugal casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127175A CN1127175A (en) | 1996-07-24 |
| CN1059364C true CN1059364C (en) | 2000-12-13 |
Family
ID=5077441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95110010A Expired - Fee Related CN1059364C (en) | 1995-01-17 | 1995-01-17 | Pouring protective slag for electric slag centrifugal casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1059364C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965519A (en) * | 2012-11-22 | 2013-03-13 | 河南省西保冶材集团有限公司 | Carburizing bearing steel electroslag remelting casting powder |
| CN104439194B (en) * | 2014-11-19 | 2017-02-01 | 北京天力创玻璃科技开发有限公司 | Anti-oxidation protective agent for composite roll |
| CN110964976A (en) * | 2019-11-13 | 2020-04-07 | 中煤张家口煤矿机械有限责任公司 | Steel for chain wheel and preparation method and application thereof |
| WO2021142624A1 (en) * | 2020-01-14 | 2021-07-22 | 泰安特夫德新材料科技有限公司 | Method for centrifugally casting composite steel pipe by means of slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068764A (en) * | 1992-07-14 | 1993-02-10 | 冶金工业部钢铁研究总院 | Centrifugal casting molten-slag |
| CN1069212A (en) * | 1991-08-12 | 1993-02-24 | 北京科技大学 | Induction centrifugal electroslag casting abnormity hollow casting |
| CN1107766A (en) * | 1994-12-23 | 1995-09-06 | 冶金工业部钢铁研究总院 | Centrifugal casting scoria |
-
1995
- 1995-01-17 CN CN95110010A patent/CN1059364C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069212A (en) * | 1991-08-12 | 1993-02-24 | 北京科技大学 | Induction centrifugal electroslag casting abnormity hollow casting |
| CN1068764A (en) * | 1992-07-14 | 1993-02-10 | 冶金工业部钢铁研究总院 | Centrifugal casting molten-slag |
| CN1107766A (en) * | 1994-12-23 | 1995-09-06 | 冶金工业部钢铁研究总院 | Centrifugal casting scoria |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1127175A (en) | 1996-07-24 |
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