CN108559902A - A kind of processing method for eliminating grain roll core greyness - Google Patents
A kind of processing method for eliminating grain roll core greyness Download PDFInfo
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- CN108559902A CN108559902A CN201810449041.7A CN201810449041A CN108559902A CN 108559902 A CN108559902 A CN 108559902A CN 201810449041 A CN201810449041 A CN 201810449041A CN 108559902 A CN108559902 A CN 108559902A
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- iron
- greyness
- nodulizer
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of processing method for eliminating grain roll core greyness,The present invention utilizes steel scrap,It is at low cost that particle steel adds carburant synthetic cast iron roll to have the advantages that,The addition of carburant and raising furnace temperature appropriate eliminate the heredity of furnace charge,The degree of purity of iron liquid is set to be improved,The present invention utilizes composite nodulizer nodularization iron liquid,Make molten iron that there is good clean-up effect,Antifading,And the graphite particle in cast iron can be refined,Reduce the formation of chunky graphite,And control sulfur content in molten iron,Magnesium elements in too low nodulizer can not be closed with vulcanization,Excessive remaining magnesium can cause shrinkage cavity,The defects of stomata,Very few residual magnesium content easily forms greyness,The processing method of the present invention is simple for process,The combined processing of step and nodulizer is added by the priority of material makes the grain roll produced meet different requirements,Application prospect is extensive,It is worthy to be popularized.
Description
Technical field
The present invention relates to roll manufacturing field more particularly to a kind of processing methods for eliminating grain roll core greyness.
Background technology
One of major defect of roller neck is " black gray expandable spot ", and technical term is known as " chunky graphite ", in roll
In casting industry commonly referred to as " greyness ", its quality is loose, and mechanical property is poor, and harm is extremely serious.Its for a moment caused by
Roller neck intensity is low, so that the anti-accident performance of roll is greatly lowered, it is possible to cause pernicious roll breakage accident；Secondly poor toughness,
Elongation percentage≤0.5%, anti-bending strength, the anti-accident performance for causing roll are low, exacerbate the generation of roll neck Fragile Split；Its
Three, plasticity index significantly reduces；Its four macrostructure is poor.The macro manifestations of " greyness " on roller neck are the presence of similar gather
The main reason for long-pending ball nodular graphite spot, diameter differ in size from 2-25mm, spacing etc., and roller neck " greyness " generates
It is component segregation and inoculation fade caused by cooling slow, eutectic freezing overlong time, so how to prevent roll component inclined
The determination of analysis, the content of core chemical composition seems that lattice are important, and scientific and reasonable processing method is only and eliminates greyness, ensures to roll
The research emphasis of roller quality.
Invention content
The purpose of the present invention is to provide a kind of processing methods for eliminating grain roll core greyness, to solve above-mentioned technology
Problem.
The present invention using following technical scheme in order to solve the above technical problems, realized：
A kind of processing method for eliminating grain roll core greyness, including step in detail below：
(1) particle steel and foundry returns are added to heating and melting in electric frequency stove, removed the gred outward in fusing, after fusing
Power supply is closed after maintaining the temperature at 1250-1320 DEG C, carburant is added after slag is removed totally, and startup power supply heating at this time is molten
Refining adds carburant and the pig iron full up to stove when adding steel scrap, part ferrosilicon sampling analysis is then added；
(2) when bonded hard ferrite magnet reaches 1350-1420 DEG C, constant temperature is maintained at iron liquid surface capping heat preserving agent, when carburetting in stove
Agent removes heat preserving agent and slag after all dissolving and being absorbed by iron liquid, and sub-micron titanium carbide is added in iron liquid, and covering above is protected
Liquid level slag is removed in warm agent when furnace temperature reaches 1450 DEG C, and sampling is poured into thermal analyzer sample cup, and the element for adjusting original iron melt contains
Amount, reaches C：3.2~3.6%, Si：0.7~1.1%, Mn：0.5~0.8%, Cr：1.0~2.0%, Ni：3~5%,
Mo：0.2~0.5%, Ti：0.03~0.05%, P≤0.04%, S≤0.03%, surplus Fe；
(3) final deoxidizing when bonded hard ferrite magnet reaches 1500-1530 DEG C, then nodulizer is put into the side of ladle dykes and dams,
Clean rustless magnesium iron bits are covered again, pay attention to tamping, control molten iron tapping temperature is up to 1550 DEG C, when iron liquid reaches 3/4 in packet,
Stop iron liquid, iron liquid carries out spheroidizing reacion in pelletized packet, while in stove remaining 1/4 iron liquid being continued to heat up, in packet
Spheroidizing reacion terminates and clears up dross, and inovulant is added and remaining 1/4 iron liquid is added, controls the temperature of iron liquid in stove not
More than 1570 DEG C, fine grained carburant is added in right amount in the liquid level of molten iron at this time；
(4) temperature for going out vermicularizing control iron liquid is 1430-1530, is then poured, and pouring the time does not exceed
10min, it is after being poured, remaining molten iron in ladle is most, bits are scratched clean, in case subsequently using again.
A kind of processing method for eliminating grain roll core greyness, particle steel, foundry returns, steel scrap described in step (1)
Addition proportioning with the pig iron is 25-30：14-18：30-40：9-13.
A kind of processing method for eliminating grain roll core greyness, the carburant in step (1) are added for the first time
Amount is 20-30wt%, and second of addition is 40-50wt%.
A kind of processing method for eliminating grain roll core greyness, the preparation of the sub-micron titanium carbide described in step (2)
Method is：By carbon nanotube in the ball mill with 300r/min ball milling 2h, the carbon nanotube and iron powder, titanium valve after ball milling are according to C/
Ti molar ratios are that 1.0 ratios carry out dispensing, in ratio of grinding media to material 10：With the rotating speed ball milling 48h of 50r/min under 1, obtains titanium carbide and contain
Amount is the composite powder of 30vol%, and then hydraulic pressure is crushed after constant temperature holding 10min at 500 DEG C at prefabricated section and obtained.
A kind of processing method for eliminating grain roll core greyness, the nodulizer described in step (3) are heavy rare earth nodularization
Agent, light rare earth nodulizer and nickel magnesium nodulizer are according to mass ratio 5：5：1 mixes, and the addition of nodulizer is 1.1-1.6%.
A kind of processing method for eliminating grain roll core greyness, the heavy rare earth nodulizer are Yttrium base rare earth composite balls
Agent, wherein the antimony element of addition 0.006%.
A kind of processing method for eliminating grain roll core greyness, the light rare earth nodulizer are cerium-based rare earth composite balls
Agent.
A kind of processing method for eliminating grain roll core greyness, the inovulant described in step (3) are low silicon inoculant,
Wherein constituent is silicon 30-35%, calcium 1.5-2.0%, barium 1.0-1.5%, aluminium<0.6%.
A kind of processing method for eliminating grain roll core greyness, the grain size of the fine grained carburant described in step (3)
For 0.5-1.0mm.
The beneficial effects of the invention are as follows：
According to steel scrap inclusion content, low, stable components characteristic adds carburant to synthesize to the present invention using steel scrap, particle steel
Grain roll has the advantages that at low cost, and the addition of carburant and raising furnace temperature appropriate eliminate the heredity of furnace charge, make iron
The degree of purity of liquid is improved, in order to eliminate the generation of roll greyness in process of production, the present invention using heavy rare earth nodulizer,
Light rare earth nodulizer and nickel magnesium nodulizer mixing nodularization iron liquid make molten iron have good clean-up effect, antifading, and
The graphite particle in cast iron can be refined, the formation of chunky graphite is reduced, and controls sulfur content in molten iron, makes the content of sulphur
It is maintained at a certain range, the performance of excessively high extreme influence casting, the magnesium elements in too low nodulizer can not be closed with vulcanization, excessive
Remaining magnesium can cause the defects of shrinkage cavity, stomata, and very few residual magnesium content easily forms greyness, finally breed, nodularization after the completion of plus
Enter fine grained carburant and promote graphitization, is conducive to the generation of graphite, the grain roll of production is made to have good performance, this hair
Bright processing method is simple for process, the combined processing of step and nodulizer is added by the priority of material, the cast iron produced is made to roll
Roller meets different requirements, and application prospect is extensive, is worthy to be popularized.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below
Specific embodiment is closed, the present invention is further explained, but following embodiments are only the preferred embodiment of the present invention, and not all.
Based on the implementation example in the implementation mode, those skilled in the art's obtained other realities without making creative work
Example is applied, protection scope of the present invention is belonged to.Experimental method in following embodiments is unless otherwise specified conventional method,
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
A kind of processing method for eliminating grain roll core greyness, including step in detail below：
(1) particle steel and foundry returns are added to heating and melting in electric frequency stove, removed the gred outward in fusing, after fusing
Power supply is closed after maintaining the temperature at 1250-1320 DEG C, 20wt% carburants is added after slag is removed totally, at this time startup power supply
Melting is heated, adds 50wt% carburants and the pig iron full up to stove when adding steel scrap, wherein particle steel, foundry returns, steel scrap and the pig iron
Mass ratio be 28：17：35：10, part ferrosilicon sampling analysis is then added；
(2) when bonded hard ferrite magnet reaches 1350-1420 DEG C, constant temperature is maintained at iron liquid surface capping heat preserving agent, when carburetting in stove
Agent removes heat preserving agent and slag after all dissolving and being absorbed by iron liquid, and sub-micron titanium carbide is added in iron liquid, and covering above is protected
Liquid level slag is removed in warm agent when furnace temperature reaches 1450 DEG C, and sampling is poured into thermal analyzer sample cup, and the element for adjusting original iron melt contains
Amount, reaches C：3.2~3.6%, Si：0.7~1.1%, Mn：0.5~0.8%, Cr：1.0~2.0%, Ni：3~5%,
Mo：0.2~0.5%, Ti：0.03~0.05%, P≤0.04%, S≤0.03%, surplus Fe；
(3) final deoxidizing when bonded hard ferrite magnet reaches 1500-1530 DEG C, then by Yttrium base rare earth composite nodulizer, cerium-based rare earth
Composite nodulizer and nickel magnesium nodulizer are according to mass ratio 5：5：1 composite nodulizer being mixed is put into the one of ladle dykes and dams
Side, adds 0.006% antimony element wherein in Yttrium base rare earth composite nodulizer, composite nodulizer covers clean rustless magnesium iron again
Bits pay attention to tamping, and control molten iron tapping temperature is up to 1550 DEG C, when iron liquid reaches 3/4 in packet, stop iron liquid, pelletized packet
Interior iron liquid carries out spheroidizing reacion, while in stove remaining 1/4 iron liquid being continued to heat up, and wraps interior spheroidizing reacion and terminates and clear up floating
Inovulant is added and remaining 1/4 iron liquid is added by slag, and the temperature for controlling iron liquid in stove is no more than 1570 DEG C, at this time in iron
0.5-1.0mm fine grained carburants are added in the liquid level of water in right amount；
(4) temperature for going out vermicularizing control iron liquid is 1430-1530, is then poured, and pouring the time does not exceed
10min, it is after being poured, remaining molten iron in ladle is most, bits are scratched clean, in case subsequently using again.
A kind of processing method for eliminating grain roll core greyness, the preparation of the sub-micron titanium carbide described in step (2)
Method is：By carbon nanotube in the ball mill with 300r/min ball milling 2h, the carbon nanotube and iron powder, titanium valve after ball milling are according to C/
Ti molar ratios are that 1.0 ratios carry out dispensing, in ratio of grinding media to material 10：With the rotating speed ball milling 48h of 50r/min under 1, obtains titanium carbide and contain
Amount is the composite powder of 30vol%, and then hydraulic pressure is crushed after constant temperature holding 10min at 500 DEG C at prefabricated section and obtained.
A kind of processing method for eliminating grain roll core greyness, the inovulant described in step (3) are low silicon inoculant,
Wherein constituent is silicon 30-35%, calcium 1.5-2.0%, barium 1.0-1.5%, aluminium<0.6%.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, described in the above embodiment and specification is only the present invention
Preference, be not intended to limit the present invention, without departing from the spirit and scope of the present invention, the present invention also has various
Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute
Attached claims and its equivalent thereof.
Claims (9)
1. a kind of processing method for eliminating grain roll core greyness, which is characterized in that including step in detail below：
(1) particle steel and foundry returns are added to heating and melting in electric frequency stove, remove the gred in fusing, is kept after fusing outward
Temperature closes power supply after 1250-1320 DEG C, and carburant is added after slag is removed totally, and startup power supply heats melting at this time,
Add carburant and the pig iron full up to stove when adding steel scrap, part ferrosilicon sampling analysis is then added；
(2) when bonded hard ferrite magnet reaches 1350-1420 DEG C, constant temperature is maintained at iron liquid surface capping heat preserving agent, when carburant is complete in stove
Portion dissolves and removes heat preserving agent and slag after being absorbed by iron liquid, and sub-micron titanium carbide is added in iron liquid, above covering and heat insulating agent,
Liquid level slag is removed when furnace temperature reaches 1450 DEG C, sampling pours into thermal analyzer sample cup, adjusts the constituent content of original iron melt, make
It reaches C：3.2~3.6%, Si：0.7~1.1%, Mn：0.5~0.8%, Cr：1.0~2.0%, Ni：3~5%, Mo：0.2
~0.5%, Ti：0.03~0.05%, P≤0.04%, S≤0.03%, surplus Fe；
(3) final deoxidizing when bonded hard ferrite magnet reaches 1500-1530 DEG C, then nodulizer is put into the side of ladle dykes and dams, then cover
Upper clean rustless magnesium iron bits, pay attention to tamping, control molten iron tapping temperature is up to 1550 DEG C, when iron liquid reaches 3/4 in packet, stops
Iron liquid, iron liquid carries out spheroidizing reacion in pelletized packet, while in stove remaining 1/4 iron liquid being continued to heat up, wrap in nodularization
Reaction terminates and clears up dross, and inovulant is added and remaining 1/4 iron liquid is added, the temperature for controlling iron liquid in stove is no more than
1570 DEG C, fine grained carburant is added in right amount in the liquid level of molten iron at this time；
(4) temperature for going out vermicularizing control iron liquid is 1430-1530, is then poured, and pouring the time does not exceed 10min, pours
It is after note, remaining molten iron in ladle is most, bits are scratched clean, in case subsequently using again.
2. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(1) the addition proportioning of particle steel, foundry returns, steel scrap and the pig iron described in is 25-30：14-18：30-40：9-13.
3. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(1) the carburant first time addition in is 20-30wt%, and second of addition is 40-50wt%.
4. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(2) preparation method of the sub-micron titanium carbide described in is：By carbon nanotube in the ball mill with 300r/min ball milling 2h, ball milling
Carbon nanotube and iron powder, titanium valve afterwards carries out dispensing according to C/Ti molar ratios for 1.0 ratios, in ratio of grinding media to material 10：With 50r/ under 1
The rotating speed ball milling 48h of min, obtain carbonization Ti content be 30vol% composite powder, then hydraulic pressure at prefabricated section at 500 DEG C
It crushes and obtains after constant temperature holding 10min.
5. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(3) nodulizer described in attaches most importance to rare-earth nodularizer, light rare earth nodulizer and nickel magnesium nodulizer according to mass ratio 5：5：1 mixing and
At the addition of nodulizer is 1.1-1.6%.
6. a kind of processing method for eliminating grain roll core greyness according to claim 5, which is characterized in that described
Heavy rare earth nodulizer is Yttrium base rare earth composite nodulizer, wherein the antimony element of addition 0.006%.
7. a kind of processing method for eliminating grain roll core greyness according to claim 5, which is characterized in that described
Light rare earth nodulizer is cerium-based rare earth composite nodulizer.
8. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(3) inovulant described in is low silicon inoculant, and wherein constituent is silicon 30-35%, calcium 1.5-2.0%, barium 1.0-
1.5%, aluminium<0.6%.
9. a kind of processing method for eliminating grain roll core greyness according to claim 1, which is characterized in that step
(3) grain size of the fine grained carburant described in is 0.5-1.0mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810449041.7A CN108559902A (en) | 2018-05-11 | 2018-05-11 | A kind of processing method for eliminating grain roll core greyness |
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| CN201810449041.7A CN108559902A (en) | 2018-05-11 | 2018-05-11 | A kind of processing method for eliminating grain roll core greyness |
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| CN110229994A (en) * | 2019-07-30 | 2019-09-13 | 吉林大学 | Spheroidal graphite cast-iron and preparation method thereof |
| CN112439881A (en) * | 2020-11-06 | 2021-03-05 | 中原内配集团股份有限公司 | Low-silicon inoculant and preparation method thereof |
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Application publication date: 20180921 |