CN1012905B - Preparing method of si-fe-bi instantaneous inoculant - Google Patents
Preparing method of si-fe-bi instantaneous inoculantInfo
- Publication number
- CN1012905B CN1012905B CN 88104493 CN88104493A CN1012905B CN 1012905 B CN1012905 B CN 1012905B CN 88104493 CN88104493 CN 88104493 CN 88104493 A CN88104493 A CN 88104493A CN 1012905 B CN1012905 B CN 1012905B
- Authority
- CN
- China
- Prior art keywords
- inoculant
- iron
- bismuth
- instantaneous
- nucleating agent
- 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
Links
Abstract
The present invention relates to a preparing method of Si-Fe-Bi instantaneous inoculant used for preparing magnesium iron. Silicon iron, bismuth, fluxing agents, etc. are prepared into Si-Fe-Bi instantaneous inoculant in a mechanical mixing method. The silicon iron and the fluxing agents are weighed in a volumetric method, and the bismuth is weighed in a tablet method. The amount of the inoculant packed in a bag is determined based on the volume of a foundry ladle. When the inoculant is used, the inoculant packed in a bag is directly thrown into the foundry ladle, and steps, such as a pulverization step, a sieving step, a preparation step, etc., are cancelled. The inoculation effect is obvious. The Si-Fe-Bi instantaneous inoculant has the obvious capability for eliminating internal chill and the function for compensating spheroidization. When the phosphorus content reaches 0.13%, the number of nodular graphites in magnesium iron can reach more than 800 /mm<2>, the ferrite content is more than 85%, and the performance is stable.
Description
The present invention is a kind of preparation method who produces the nucleating agent that magnesium iron uses, and is applicable to the production of rare earth magnesium as-cast ferrite ductile iron.
The nucleating agent that is used for Cast Iron Production both at home and abroad has thousands of kinds, and has realized seriation and commercialization.But wherein mostly is the silicon based inoculant that contain elements such as Ba, Sr, Zr, Re, Mg, is mainly used in graphitic cast iron and double as ductile iron inoculant.The Bi nucleating agent that contains that is exclusively used in as-cast ferrite ductile iron still is in conceptual phase.RCA nucleating agent by the Huazhong Institute of Technology development is the special-purpose nucleating agent of domestic unique ferritic spheroidal graphite cast iron.Be compounded with multiple constituent elements such as Al, Ca, Re, Bi because of it, so complex manufacturing, cost are higher.
The invention provides a kind of composition accurately, stable performance, technology is simple, cost is lower, easy to use nucleating agent and preparation method thereof.This nucleating agent is a mechanical mixture, contains Bi, Si, Al, Ca, Fe composition and adds a certain amount of fusing assistant.The results showed that allocating trace bismuth in the nucleating agent into can significantly increase number of graphite ball in the magnesium iron, a small amount of fusing assistant can be given full play to the inoculation(effect) of ferrosilicon.The number of graphite ball that breeds the back magnesium iron is many, ferrite content is big.Carbides-free, and tiny, the rounding of graphite pebbles that obtains have tangible subsidy spheroidization.Even reaching 0.13%, phosphorus content can make also that number of graphite ball reaches 800/mm in the as-cast ball iron
2More than, ferrite content reaches more than 85%, and unit elongation is greater than 15%, and the iron phosphide eutectic amount is less than 0.5%.The high temperature ferritizing annealing need not be carried out, just high-quality magnesium iron can be obtained.The weight percent of this each composition of nucleating agent is;
Si 57-68%
Al 0.5-1.5%
Ca 0.5-1.0%
Bi 0.25-0.5%
For improving pregnant effect, add 10% fusing assistant, all the other are iron.
Mechanical mixing is adopted in the preparation of this nucleating agent.Earlier with bismuth meal and iron powder in proportion mixing be pressed into the tablet of certain diameter and weight, ferrosilicon is broken into the powder of certain particle size.Ferrosilicon and fusing assistant are pressed volume quantitative during preparation, and bismuth is quantitative with tablet, are distributed into bag then.During use,, packed nucleating agent pours molten iron as long as being dropped into casting ladle.If during current-following inoculation, nucleating agent inserted in its inoculation device get final product, the operator there is not very requirement.This nucleating agent has province's energy, lossless, composition is accurate, technology is simple characteristics.Nucleating agent is that benchmark is determined its Packing Unit with the capacity of hot metal ladle, and the hot metal ladle of differing capacities is used different bag packings, and its packing is the commodity seriation.Nucleating agent particulate size increases with the increase of hot metal ladle capacity.
Below provide the method for joining of several nucleating agents.Iron powder and bismuth meal with 30 purpose sieve, and are pressed into Φ 55mm behind the ratio mixing in 40-60%, weigh the sheet of 0.6 gram.Again 75 ferrosilicon fragmentations are sieved, weigh up the nucleating agent that 42 ± 3 grams, 130 ± 10 restrain, 260 ± 15 grams, 500 ± 20 restrain, can obtain four kinds of specifications by weight; (form is seen below)
Pregnant effect of the present invention is good, has the inverse chill of inhibition tissue, subsidy nodularization and long-acting inoculation(effect).Stable performance, the magnesium iron after breeding needn't be carried out the ferritizing annealing processing, have shortened the production cycle, remarkable in economical benefits, and save the energy, easy to use.Be specially adapted to the production of ferritic spheroidal graphite cast iron, as automobile, tractor and other agricultural machine accessory etc.
Specification casting ladle capacity 75 ferrosilicon bismuth sheet fusing assistant granularities
GBS-15 15Kg 42±3 1 4 0.075-0.85
GBS-50 50kg 130±10 4 12 0.85-3.35
GBS-100 100Kg 260±15 8 3.35-6.0
GBS-200 200Kg 500±20 16 3.35-12.0
Claims (1)
1, a kind of preparation method who is used to produce the nucleating agent of magnesium iron is characterized in that usefulness mechanically mixing methods such as silicon, bismuth, aluminium, calcium, iron are produced nucleating agent, and wherein the weight percent of various compositions is:
Silicon 57-68%
Aluminium 0.5-1.0%
Calcium 0.5-1.0%
Bismuth 0.25-0.5%
Fusing assistant 10%
All the other are iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104493 CN1012905B (en) | 1988-07-14 | 1988-07-14 | Preparing method of si-fe-bi instantaneous inoculant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104493 CN1012905B (en) | 1988-07-14 | 1988-07-14 | Preparing method of si-fe-bi instantaneous inoculant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1039266A CN1039266A (en) | 1990-01-31 |
| CN1012905B true CN1012905B (en) | 1991-06-19 |
Family
ID=4833031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88104493 Expired CN1012905B (en) | 1988-07-14 | 1988-07-14 | Preparing method of si-fe-bi instantaneous inoculant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012905B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323184C (en) * | 2005-08-04 | 2007-06-27 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371475C (en) * | 2001-04-05 | 2008-02-27 | 包头文鑫实业有限公司 | Process for producing composite inoculant (block) by double smelting furnace of ore-smelting furnace and medium frequency (industry frequency) electric furnace |
| US6613119B2 (en) * | 2002-01-10 | 2003-09-02 | Pechiney Electrometallurgie | Inoculant pellet for late inoculation of cast iron |
| CN102380592A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Rare earth adding method for throwing Fe-RE intermediate alloy into steel ladle |
-
1988
- 1988-07-14 CN CN 88104493 patent/CN1012905B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323184C (en) * | 2005-08-04 | 2007-06-27 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1039266A (en) | 1990-01-31 |
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| CF01 | Termination of patent right due to non-payment of annual fee |