CN109913741A - A kind of random inoculant for eliminating gray iron casting undercooled graphite - Google Patents
A kind of random inoculant for eliminating gray iron casting undercooled graphite Download PDFInfo
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- CN109913741A CN109913741A CN201711389750.2A CN201711389750A CN109913741A CN 109913741 A CN109913741 A CN 109913741A CN 201711389750 A CN201711389750 A CN 201711389750A CN 109913741 A CN109913741 A CN 109913741A
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- graphite
- casting
- undercooled
- gray iron
- undercooled graphite
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention is a kind of random inoculant that can eliminate gray iron casting undercooled graphite, in casting of the production such as turbocharger middle body one kind, due to the setting rate of hypoeutectic gray iron piece and component segregation, undercooled graphite is also easy to produce in casting thin-walled or wedge angle position, undercooled graphite is in directional distribution in casting, the intensity of casting part can be weakened, when being handled with all kinds of random inoculants, the generation of undercooled graphite is not can be effectively controlled, the present invention is a kind of more potent random inoculant of magnesium content, primary and eutectic graphite can be made to be precipitated simultaneously with austenite dendrites, to eliminate or reduce undercooled graphite.
Description
Technical field
Foundary industry produces and eliminates a kind of random inoculant that part generates undercooled graphite in hypoeutectic gray iron.
Background technique
When producing the casting of turbocharger middle body, due to the setting rate and component segregation of hypoeutectic gray iron piece
Reason is also easy to produce undercooled graphite at the position of casting thin-walled or wedge angle.The increase of undercooled graphite capacity can be to casting in casting
Strength reduction, mainly cooling velocity are fast, and graphite is precipitated in molten iron between austenite dendrites grows up, and directionality occurs in distribution, into
And part machinery performance is caused directionality occur, the intensity of casting is finally influenced, thin-walled and wedge angle position are especially easily appeared in.
In tradition prevention and treatment technique, it is improved the ratio of the pig iron, is added 1% or more silicon carbide in furnace, it is nickelic pregnant that when molten iron discharging is added 1%
Agent is educated, 0.2% zirconium, aluminium pretreating agent are added in furnace, improves innoculant adding quantity and silicomanganese zirconium, silicon strontium using Fushi section
Or angstrom willing silicon strontium inoculant, but these schemes cannot effectively eliminate casting local overcooling graphite.
Summary of the invention
Of the invention is to research and develop a kind of more potent inovulant, and change molten steel solidification mode, can make primary and eutectic
Body graphite is precipitated simultaneously with austenite dendrites, to eliminate or reduce undercooled graphite.
The technical scheme is that a kind of dedicated random inoculant containing magnesium of gray iron, contains 2-4.5% magnesium Mg, 0-7% manganese
Mn, 0.5-3% barium Ba, 40-72% silicon Si, remaining is iron (Fe), can be made by melting or hybrid mode, for pregnant with flowing
It educates.
Remarkable result of the invention is after new innoculant adding quantity is 0.15-0.2%, so that it may be eliminated in hypoeutectic gray iron
Undercooled graphite in part, by the way that 0.5% different inovulants are added in identical molten iron, 100 times of test block metallographic comparisons are each with tradition
The result presentation of inovulant is planted, undercooled graphite content is minimum in inovulant test block of the invention.Meanwhile also make casting in thin-walled and
The intensity at wedge angle position and other positions are almost the same.
Detailed description of the invention
Fig. 1 is 920 inovulant test block of Fushi section silicon rare earth, 100 times of metallographic microscopes
Fig. 2 is angstrom 100 times of metallographic microscopes of willing silicon strontium zirconium inovulant test block
Fig. 3 is 100 times of metallographic microscopes of Dongfeng silicon barium 70SB-2 inovulant test block
Fig. 4 is 100 times of metallographic microscopes of new inovulant test block
Specific embodiment
Respectively being added in 0.5% 100 times of metallographic microscope 1-4 of different random inoculant test blocks in identical molten iron can be seen that, adopt in original
The inovulant test block metallographic of purchase is it will be evident that undercooled graphite is arranged in directionality, and uses new inovulant test block of the invention
In metallographic, it is substantially not visible the undercooled graphite arranged in directionality.Test block can be quickly detected, thickness using velocity of sound test block
Also close with casting section thickness, it is more convenient for comparing pregnant effect, 0.15% Dongfeng 70SB-2 random inoculant is added in identical molten iron
In the molten iron degree of supercooling comparison of inovulant of the present invention, the degree of supercooling of Dongfeng is 4 DEG C, and inovulant of the present invention is 1 DEG C, to molten iron
Degree of supercooling reduces obvious.
Claims (1)
1. the random inoculant that one kind can eliminate gray iron casting undercooled graphite, it is characterised in that: contain magnesium (Mg) 2-4.5%, manganese
(Mn) 0-7%, barium (Ba) 0.5-3%, silicon (Si) 40-72%, remaining is iron (Fe), can be made up of melting or hybrid mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389750.2A CN109913741A (en) | 2017-12-13 | 2017-12-13 | A kind of random inoculant for eliminating gray iron casting undercooled graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389750.2A CN109913741A (en) | 2017-12-13 | 2017-12-13 | A kind of random inoculant for eliminating gray iron casting undercooled graphite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109913741A true CN109913741A (en) | 2019-06-21 |
Family
ID=66959491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711389750.2A Withdrawn CN109913741A (en) | 2017-12-13 | 2017-12-13 | A kind of random inoculant for eliminating gray iron casting undercooled graphite |
Country Status (1)
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| CN (1) | CN109913741A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363876A (en) * | 2020-04-28 | 2020-07-03 | 共享装备股份有限公司 | Inoculation line formula for gray cast iron line feeding inoculation and production process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1373882A (en) * | 1963-08-30 | 1964-10-02 | British Cast Iron Res Ass | Improvements in the manufacture of cast iron |
| US4867227A (en) * | 1987-08-07 | 1989-09-19 | Metallgesellschaft Aktiengesellschaft | Process and apparatus for inoculating cast iron |
| WO2006068487A1 (en) * | 2004-12-23 | 2006-06-29 | Elkem Asa | Modifying agents for cast iron |
| CN103857807A (en) * | 2011-10-07 | 2014-06-11 | 曙制动器工业株式会社 | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
-
2017
- 2017-12-13 CN CN201711389750.2A patent/CN109913741A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1373882A (en) * | 1963-08-30 | 1964-10-02 | British Cast Iron Res Ass | Improvements in the manufacture of cast iron |
| US4867227A (en) * | 1987-08-07 | 1989-09-19 | Metallgesellschaft Aktiengesellschaft | Process and apparatus for inoculating cast iron |
| WO2006068487A1 (en) * | 2004-12-23 | 2006-06-29 | Elkem Asa | Modifying agents for cast iron |
| CN103857807A (en) * | 2011-10-07 | 2014-06-11 | 曙制动器工业株式会社 | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363876A (en) * | 2020-04-28 | 2020-07-03 | 共享装备股份有限公司 | Inoculation line formula for gray cast iron line feeding inoculation and production process |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190621 |
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| WW01 | Invention patent application withdrawn after publication |