CN109837454A - A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof - Google Patents
A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to cast iron materials and technical field of casting and metallurgy, in particular to a kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof.The profile is to be prepared by following elements according to mass percent: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium: 0.04%-0.06%, phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron.The present invention is solved in Large-cross-section nodular cast iron profile in production, the center portion liquid of the profile intracardiac nodularization and inoculation fade, graphite convergence merge, and graphite crystal nucleus quantity is few, graphite morphology, so that the profile entirety Oxygen potential is low, spheroidal graphite is coarse, graphite deformity, cast properties decline, it when serious, or even will cause the problem of casting is scrapped, have the advantages that practical.
Description
Technical field
The invention belongs to cast iron materials and technical field of casting and metallurgy, in particular to a kind of big cross section high-intensity and high-tenacity ball
Black cast iron profile material and preparation method thereof.
Background technique
Spheroidal graphite cast-iron is a kind of 20th century high strength cast iron material for growing up of the fifties, comprehensive performance close to
Steel is based on its excellent performance, has been successfully used to cast some stress complexity, intensity, toughness, wearability are more demanding
Part.
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, the effective mechanical performance for improving cast iron, special
It is not to improve plasticity and toughness, to obtain the intensity also higher than carbon steel.So the nodulizing grade of graphite influences spheroidal graphite cast-iron
Performance.Mechanical performance is influenced with reference to it according to the form of graphite and its distribution and Oxygen potential according to GB/T9441-2009
Nodularization is divided into six grades by trend and process characteristic, and specially 1-6 grades, 1 grade preferably, and graphite nodule rate is not less than 95%；Graphite
The nodularization of size is classified as 3-8 grades, and 8 grades preferably, and practical graphite length of the globular graphite diameter under 100 power microscopes is
0.06-0.015mm.So improving graphite nodule rate when preparing spheroidal graphite cast-iron, the graphite for obtaining more preferable grade is manufacture spheroidal graphite
The key of cast iron.
Large-cross-section nodular cast iron refers to spheroidal graphite cast-iron used in spheroidal graphite casting of the maximum gauge greater than 100 millimeters, existing
For Large-cross-section nodular cast iron since section is blocked up, cooling velocity is slow, the intracardiac easy nodularization of the center portion liquid of Large-cross-section nodular cast iron with
Inoculation fade, graphite convergence merge, and graphite crystal nucleus quantity is few, graphite morphology, so that cast iron entirety Oxygen potential is low, graphite is coarse,
Graphite deformity, cast properties decline, when serious, or even will cause casting and scraps.The present invention is directed to this problem, has explored one
The preparation method of kind practical.
Summary of the invention
The object of the present invention is to provide a kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof, solutions
A kind of Large-cross-section nodular cast iron profile determined in production, the center portion liquid of the profile intracardiac nodularization and inoculation fade, graphite converge
Simultaneously, graphite crystal nucleus quantity is few, graphite morphology, so that the profile entirety Oxygen potential is low, spheroidal graphite is coarse for polymerization, graphite deformity, casting
Performance decline, when serious, or even will cause the problem of casting is scrapped.
A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, which is by following elements according to mass percent system
It is standby to form: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium: 0.04%-0.06%,
Phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron.
By adopting the above technical scheme, the graphite form of the Large-cross-section nodular cast iron profile obtained is good, and graphite roundness is high, stone
Ink is tiny, and graphite nodule rate is high, and obtained Large-cross-section nodular cast iron profile intensity is high, good toughness.
Further preferably are as follows: the profile is to be prepared by following elements according to mass percent: carbon: 3.48%, silicon:
2.65%, manganese: 0.37%, magnesium: 0.048%, phosphorus: 0.035%, sulphur: 0.01%, remaining is iron.
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 3-5 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 500-
600℃；
(2) ingredient is weighed the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.55%-3.65%, silicon: 1.3%-1.4%, manganese: 0.32%-0.42%, the wherein selection of the pig iron
Amount is the 50%-55% of ingredient gross mass, and the selection amount of steel scrap is the 30%-35% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, the additional amount of the carburant is the 0.7%-0.82% of molten iron gross mass, iron
Water is increased between 1500-1550 DEG C, after the completion of overheat, is transferred to the holding furnace of the continuous molten iron discharging toward ladle in, and continuously past
The iron liquid mixing stored in the holding furnace of molten iron discharging in ladle, while temperature is down to the temperature range 1430- properly to come out of the stove
1450℃；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.7%-1.9% of molten steel quality, and silicon-iron block additional amount is molten steel quality
0.4%-0.6%, the silicon-iron block are divided into two parts addition, and a part is added in smelt stage, and additive amount is to reach silicone content
To the silicon amount required in step (2), another part is covered on nodulizer in spheroidising, and innoculant adding quantity is molten iron matter
The 0.4%-0.6% of amount；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium:
0.04%-0.06%, phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron；
(6) it horizontal casting drawing: has taken off after slag and temperature test is carried out to molten iron, molten iron temperature is controlled at 1375-1390 DEG C
Between, then molten iron is poured into the holding furnace of continuous casting drawing, iron liquid temperature in the holding furnace of control continuous casting drawing after the completion of toppling over
Degree is at 1335-1350 DEG C；Supply molten iron as needed；Stop 3 minutes after molten iron injects in the holding furnace of continuous casting drawing, then
Start the drawing equipment of horizontal casting drawing, the drawing equipment is walked by step-length 35-50mm/ and carried out in a manner of drawing-stop-draw
Drawing controls the leaving water temperature of the recirculated water in the water cooling graphite crystallizer not higher than 50 DEG C during the drawing process.
Further preferably are as follows: in step (2) after weighed furnace in ingredient the pig iron, steel scrap, the foundry returns amount of weighing by following matter
Amount portion rate weighs: the pig iron: steel scrap: foundry returns is 55:35:15.
Further preferably are as follows: the pig iron described in step (2) is pig iron Q10.
Further preferably are as follows: nodulizer described in step (4) is rare earth magnesium ferrosilicon alloy, the granule size of the nodulizer
For 10-30mm, the nodulizer additional amount is the 1.8% of molten steel quality.
Further preferably are as follows: silicon-iron block described in step (4) is 75#Silicon-iron block, the silicon-iron block granule size are 15-
35mm, the additional amount of the silicon-iron block are the 0.5% of molten steel quality.
Further preferably are as follows: inovulant described in step (4) is barium ferrosilicon, and the granule size of the inovulant is 3-8mm,
The innoculant adding quantity is the 0.5% of molten steel quality.
Further preferably are as follows: drawing equipment described in step (6) includes traction link seat and master operation disk, and when drawing waits for institute
It states traction link seat starting to stablize, after the profile upper roller of red heat, according to the color that the step-length of pull-out is shown, determines a need for mentioning
Then speed determines drawing and the parameter normally produced stopped on the master operation disk.
Further preferably are as follows: when feeding molten iron to the holding furnace of continuous casting drawing in step (6), feed the time of molten iron every time
Separation control was at 9-11 minutes.
In conclusion the invention has the following advantages:
In traditional spheroidal graphite cast-iron preparation, the pig iron and a small amount of carburant of the general steel scrap for using 10%-20% and 80%-90%
Cast spheroidal graphite cast-iron.Since ecosystem graphite is very coarse in the pig iron, and have heredity, phosphorus content 4.0% or so, although by
Melting, but since molten iron fusing point is 1100-1200 DEG C, graphite fusing point is effectively melted to graphite micro- at 3602-3702 DEG C, not
Small, carbon is not dissolved in pure iron matrix completely, and harmful element is more, and graphite is few, irregular, coarse.The present invention passes through increasing
Big steel scrap dosage, reduces the dosage of the pig iron, to reduce graphite hereditation in the pig iron, refines stone by carburant
Ink weakens the hereditation of coarse graphite in the pig iron.More carburant is added during melting, carburant exists
The micro- granule of carbon is formed in iron liquid, a large amount of micro- granule of carbon is grown up with the reduction of temperature in stabilization after spheroidising
State, and its initial diameter is greater than other external nucleus for breeding compound, breeds nucleus and stablizes, the stable nucleus that breeds has
The absolute long-acting effect for breeding property and promoting nodularization, the nodularization that big cross section center portion liquid can be prevented intracardiac decline with breeding
It moves back.Simultaneously because the increase of graphite crystal nucleus, limited carbon is assigned on the graphite of increment, and the average diameter grown up is small, diameter
Small graphite nodule buoyancy is also small, it is not easy to movement of floating occur, can be effectively reduced graphite nodule and converge combined probability, prevent
The distortion and floating of graphite.The graphite spherical shape of metallographic is good, and Oxygen potential is high, can also play prevention to the generation of chunky graphite defect
Effect.
Specific embodiment
Embodiment 1:
A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, this profile are QT500-7 materialProfile, which is to be prepared by following elements according to mass percent: carbon: 3.48%, silicon:
2.65%, manganese: 0.37%, magnesium: 0.048%, phosphorus 0.035%, sulphur: 0.01%, remaining is iron.By adopting the above technical scheme, it obtains
The graphite form of the Large-cross-section nodular cast iron profile arrived is good, and graphite roundness is high, and graphite is tiny, and graphite nodule rate is high, and obtains
Large-cross-section nodular cast iron profile intensity is high, good toughness.
Embodiment 2:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 3-5 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 500-
600℃；
(2) ingredient will be weighed with the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.55%-3.65%, silicon: 1.3%-1.4%, manganese: 0.32%-0.42%, the wherein selection of the pig iron
Amount is the 50%-55% of ingredient gross mass, and the selection amount of steel scrap is the 30%-35% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, the additional amount of the carburant is the 0.7%-0.82% of molten iron gross mass, iron
Water is increased between 1500-1550 DEG C, after the completion of overheat, is transferred to the holding furnace of the continuous molten iron discharging toward ladle in, and continuously past
The iron liquid mixing stored in the holding furnace of molten iron discharging in ladle, while temperature is down to the temperature range 1430- properly to come out of the stove
1450℃；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.7%-1.9% of molten steel quality, and silicon-iron block additional amount is molten steel quality
0.4%-0.6%, the silicon-iron block are divided into two parts addition, and a part is added in smelt stage, and additive amount is to reach silicone content
To the silicon amount required in step (2), another part is covered on nodulizer in spheroidising, and innoculant adding quantity is molten iron matter
The 0.4%-0.6% of amount；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium:
0.04%-0.06%, phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron；
(6) it horizontal casting drawing: has taken off after slag and temperature test is carried out to molten iron, molten iron temperature is controlled at 1375-1390 DEG C
Between, then molten iron is poured into the holding furnace of continuous casting drawing, iron liquid temperature in the holding furnace of control continuous casting drawing after the completion of toppling over
Degree is at 1335-1350 DEG C；Supply molten iron as needed；Stop 3 minutes after molten iron injects in the holding furnace of continuous casting drawing, then
Start the drawing equipment of horizontal casting drawing, the drawing equipment is walked by step-length 35-50mm/ and carried out in a manner of drawing-stop-draw
Drawing controls the leaving water temperature of the recirculated water in the water cooling graphite crystallizer not higher than 50 DEG C during the drawing process.
In the present embodiment, by increasing steel scrap dosage, the dosage of the pig iron is reduced, to reduce graphite heredity in the pig iron
Influence, by carburant refine graphite, weaken the hereditation of coarse graphite in the pig iron.Add during melting
Enter more carburant, carburant forms the micro- granule of carbon in iron liquid, and a large amount of micro- granule of carbon is after spheroidising
As the reduction of temperature is in stable state of growing up, and its initial diameter is greater than other external nucleus for breeding compound, breeds
Nucleus is stablized, and the stable nucleus that breeds has the absolute long-acting effect for breeding property and promoting nodularization, can prevent big cross section
Center portion liquid intracardiac nodularization and inoculation fade.Simultaneously because the increase of graphite crystal nucleus, limited carbon is assigned on the graphite of increment,
The average diameter that it is grown up is small, and the small graphite nodule buoyancy of diameter is also small, it is not easy to movement of floating occur, can be effectively reduced stone
Tampon converges combined probability, prevents the distortion and floating of graphite.The graphite spherical shape of metallographic is good, and Oxygen potential is high, to chunky shape stone
The generation of black defect can also play the role of prevention.
Embodiment 3:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 4 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 600 DEG C；
(2) ingredient is weighed the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.55%, silicon: 1.4%, manganese: 0.35%, wherein the selection amount of the pig iron is the 50% of ingredient gross mass,
The selection amount of steel scrap is the 35% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, carburant additional amount is the 0.7% of molten steel quality, and molten iron is increased to 1550 DEG C,
After the completion of overheat, it is transferred to the holding furnace of the continuous molten iron discharging in ladle, with continuous in the holding furnace of molten iron discharging in ladle
The iron liquid of storage mixes, while temperature is down to 1440 DEG C of temperature properly to come out of the stove；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.9% of molten steel quality, and silicon-iron block additional amount is the 0.6% of molten steel quality, pregnant
Educate 0.4% that agent additional amount is molten steel quality；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.45%, silicon: 2.60%, manganese: 0.32%, magnesium: 0.06%, phosphorus: 0.035%, sulphur:
0.008%, remaining is iron；
(6) horizontal casting drawing: having taken off after slag and carried out temperature test to molten iron, and molten iron temperature controls between 1390 DEG C,
Then holding furnace that molten iron is poured into continuous casting drawing, bonded hard ferrite magnet exists in the holding furnace of control continuous casting drawing after the completion of toppling over
1335℃；Supply molten iron as needed；Molten iron stops 3 minutes after injecting in the holding furnace of continuous casting drawing, and then starting is horizontal
The drawing equipment of continuous casting drawing, the drawing equipment is walked by step-length 40mm/ and carries out drawing in a manner of drawing-stop-draw, in drawing
The leaving water temperature of the recirculated water in the water cooling graphite crystallizer is controlled in the process not higher than 50 DEG C.
The drawing equipment includes traction link seat and master operation disk, and when drawing waits for that the traction link seat starting is stablized, red
It after the profile upper roller of heat, according to the color that the step-length of pull-out is shown, determines a need for raising speed, then determines the master control behaviour
Make drawing and the parameter normally produced stopped on disk.The traction link seat includes drawing head, in strict accordance with type of production before production
The size of material makes drawing head.The sizeable water cooling graphite crystallizer of simultaneous selection.It is fed in the holding furnace to continuous casting drawing
When molten iron, the time interval controls of molten iron are fed every time at 11 minutes.
Such profile section section is larger, and liquid heart distance far except drawing outlet can still exist.When production never
Drawing speed is fast, and liquid level is excessively low, will affect the quality of fractography, while paying attention to the recirculated water in water cooling graphite crystallizer
Water, hydraulic pressure, water temperature control, it is small with the colour contrast of outlet end profile, it is relatively uniform be standard, forbid drawing speed mistake
Fastly, it is easy to keep the crystallization shell of profile formation thin in this way and the wick-containing of large area is formed, profile coagulates outside water cooling graphite crystallizer
Gu when be easy expansion lose circle.
The pig iron uses pig iron Q10, and the pig iron Q10 is composed of the following components in mass ratio: carbon: 4.4%, silicon:
0.095%, phosphorus: 0.036%, manganese: 0.086%, sulphur: 0.018%, titanium: 0.052%, remaining is iron.The steel scrap is in mass ratio
It is composed of the following components: carbon: 0.41%, silicon: 0.16%, phosphorus: 0.036%, manganese: 0.49%, sulphur: 0.022%, titanium:
0.042%, remaining is iron.The foundry returns is composed of the following components in mass ratio: carbon: 3.5%, silicon: and 2.65%, phosphorus:
0.046%, manganese: 0.32%, sulphur: 0.011%, remaining is iron.The carburant is the low-sulfur carburant after high temperature graphitization, is contained
Carbon amounts is 95% or more.The nodulizer is rare earth magnesium ferrosilicon alloy, and the granule size of the nodulizer is 10-30mm, described
Nodulizer is composed of the following components in mass ratio: magnesium: 6%-6.5%；Silicon: 41-44%；Remaining is iron.The silicon-iron block is 75#
Silicon-iron block, the silicon-iron block granule size are 15-35mm, and the silicon-iron block is composed of the following components in mass ratio: silicon: 65%-
75%, remaining is iron.The inovulant is barium ferrosilicon, and the granule size of the inovulant is 3-8mm, and the inovulant presses quality
Than composed of the following components: silicon: 70%-75%, calcium: 0.8%-2.2%, aluminium: 1%-2%, barium: 4%-6%, remaining is iron.
Principle: carburant forms the micro- granule of carbon in iron liquid in preparation process, has to the formation of graphite good
Inoculation(effect) especially increases and uses carburant, and inoculation(effect) becomes apparent, and melts the carbon to be formed using the disperse of carburant
Micro- granule, can be used as the graphite crystal nucleus that breeds in process of setting, and this graphite crystal nucleus property that breeds is stablized, had absolutely
It is long-acting breed property and promote nodularization effect, the nodularization and inoculation fade that big cross section center portion liquid can be prevented intracardiac, simultaneously
Due to breeding the increase of graphite crystal nucleus, limited carbon is assigned to the breeding on graphite crystal nucleus of increment, and the average diameter grown up subtracts
It is small.The small graphite buoyancy of diameter is also small, it is not easy to and movement of floating occurs, graphite can be effectively reduced and converge combined probability,
Prevent the distortion and floating of graphite.This to obtain greater number of graphite within big cross section center portion, and graphite nodule rate is high, graphite
Roundness it is high, graphite is tiny.Cast iron entirety Oxygen potential is low, and spheroidal graphite is coarse, and the situation of graphite deformity is prevented, thus greatly
The quality of profile is improved greatly.
Embodiment 4:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 3 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 550 DEG C；
(2) ingredient is weighed the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.65%, silicon: 1.3%, manganese: 0.42%, wherein the selection amount of the pig iron is the 55% of ingredient gross mass,
The selection amount of steel scrap is the 32% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, carburant additional amount is the 0.8% of molten steel quality, and molten iron is increased to 1500 DEG C,
After the completion of overheat, it is transferred to the holding furnace of the continuous molten iron discharging in ladle, with continuous in the holding furnace of molten iron discharging in ladle
The iron liquid of storage mixes, while temperature is down to 1450 DEG C of temperature properly to come out of the stove；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.7% of molten steel quality, and silicon-iron block additional amount is the 0.5% of molten steel quality, institute
It states silicon-iron block and is divided into two parts addition, a part is added in smelt stage, and additive amount is to reach silicone content in step (2) to require
Silicon amount, another part is covered on nodulizer in spheroidising, and innoculant adding quantity is the 0.5% of molten steel quality；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.55%, silicon: 2.65%, manganese: 0.40%, magnesium: 0.04%, phosphorus: 0.006%, sulphur:
0.015%, remaining is iron；
(6) horizontal casting drawing: having taken off after slag and carried out temperature test to molten iron, and molten iron temperature controls between 1380 DEG C,
Then holding furnace that molten iron is poured into continuous casting drawing, bonded hard ferrite magnet exists in the holding furnace of control continuous casting drawing after the completion of toppling over
1350℃；Supply molten iron as needed；Molten iron stops 3 minutes after injecting in the holding furnace of continuous casting drawing, and then starting is horizontal
The drawing equipment of continuous casting drawing, the drawing equipment is walked by step-length 50mm/ and carries out drawing in a manner of drawing-stop-draw, in drawing
The leaving water temperature of the recirculated water in the water cooling graphite crystallizer is controlled in the process not higher than 50 DEG C.
The drawing equipment includes traction link seat and master operation disk, and when drawing waits for that the traction link seat starting is stablized, red
It after the profile upper roller of heat, according to the color that the step-length of pull-out is shown, determines a need for raising speed, then determines the master control behaviour
Make drawing and the parameter normally produced stopped on disk.The traction link seat includes drawing head, in strict accordance with type of production before production
The size of material makes drawing head.The sizeable water cooling graphite crystallizer of simultaneous selection.It is fed in the holding furnace to continuous casting drawing
When molten iron, the time interval controls of molten iron are fed every time at 10 minutes.
Such profile section section is larger, and liquid heart distance far except drawing outlet can still exist.When production never
Drawing speed is fast, and liquid level is excessively low, will affect the quality of fractography, while paying attention to the recirculated water in water cooling graphite crystallizer
Water, hydraulic pressure, water temperature control, it is small with the colour contrast of outlet end profile, it is relatively uniform be standard, forbid drawing speed mistake
Fastly, it is easy to keep the crystallization shell of profile formation thin in this way and the wick-containing of large area is formed, profile coagulates outside water cooling graphite crystallizer
Gu when be easy expansion lose circle.
The pig iron uses pig iron Q10, and the pig iron Q10 is composed of the following components in mass ratio: carbon: 4.4%, silicon:
0.095%, phosphorus: 0.036%, manganese: 0.086%, sulphur: 0.018%, titanium: 0.052%, remaining is iron.The steel scrap is in mass ratio
It is composed of the following components: carbon: 0.41%, silicon: 0.16%, phosphorus: 0.036%, manganese: 0.49%, sulphur: 0.022%, titanium:
0.042%, remaining is iron.The foundry returns is composed of the following components in mass ratio: carbon: 3.5%, silicon: and 2.65%, phosphorus:
0.046%, manganese: 0.32%, sulphur: 0.011%, remaining is iron.The carburant is the low-sulfur carburant after high temperature graphitization, is contained
Carbon amounts is 95% or more.The nodulizer is rare earth magnesium ferrosilicon alloy, and the granule size of the nodulizer is 10-30mm, described
Nodulizer is composed of the following components in mass ratio: magnesium: 6%-6.5%；Silicon: 41-44%；Remaining is iron.The silicon-iron block is 75#
Silicon-iron block, the silicon-iron block granule size are 15-35mm, and the silicon-iron block is composed of the following components in mass ratio: silicon: 65%-
75%, remaining is iron.The inovulant is barium ferrosilicon, and the granule size of the inovulant is 3-8mm, and the inovulant presses quality
Than composed of the following components: silicon: 70%-75%, calcium: 0.8%-2.2%, aluminium: 1%-2%, barium: 4%-6%, remaining is iron.
Principle: carburant forms the micro- granule of carbon in iron liquid in preparation process, has to the formation of graphite good
Inoculation(effect) especially increases and uses carburant, and inoculation(effect) becomes apparent, and melts the carbon to be formed using the disperse of carburant
Micro- granule, can be used as the graphite crystal nucleus that breeds in process of setting, and this graphite crystal nucleus property that breeds is stablized, had absolutely
It is long-acting breed property and promote nodularization effect, the nodularization and inoculation fade that big cross section center portion liquid can be prevented intracardiac, simultaneously
Due to breeding the increase of graphite crystal nucleus, limited carbon is assigned to the breeding on graphite crystal nucleus of increment, and the average diameter grown up subtracts
It is small.The small graphite buoyancy of diameter is also small, it is not easy to and movement of floating occurs, graphite can be effectively reduced and converge combined probability,
Prevent the distortion and floating of graphite.This to obtain greater number of graphite within big cross section center portion, and graphite nodule rate is high, graphite
Roundness it is high, graphite is tiny.Cast iron entirety Oxygen potential is low, and spheroidal graphite is coarse, and the situation of graphite deformity is prevented, thus greatly
The quality of profile is improved greatly.
Embodiment 5:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 5 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 500 DEG C；
(2) ingredient is weighed the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.6%, silicon: 1.35%, manganese: 0.32%, wherein the selection amount of the pig iron is the 52% of ingredient gross mass,
The selection amount of steel scrap is the 33% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, carburant additional amount is the 0.82% of molten steel quality, and molten iron is increased to 1520
DEG C, after the completion of overheat, it is transferred to the holding furnace of the continuous molten iron discharging in ladle, the holding furnace with the continuous molten iron discharging in ladle
The iron liquid of interior storage mixes, while temperature is down to 1430 DEG C of temperature properly to come out of the stove；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.8% of molten steel quality, and silicon-iron block additional amount is the 0.4% of molten steel quality, institute
It states silicon-iron block and is divided into two parts addition, a part is added in smelt stage, and additive amount is to reach silicone content in step (2) to require
Silicon amount, another part is covered on nodulizer in spheroidising, and innoculant adding quantity is the 0.6% of molten steel quality；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.5%, silicon: 2.70%, manganese: 0.3%, magnesium: 0.05%, phosphorus: 0.025%, sulphur:
0.01%, remaining is iron；
(6) horizontal casting drawing: having taken off after slag and carried out temperature test to molten iron, and molten iron temperature controls between 1375 DEG C,
Then holding furnace that molten iron is poured into continuous casting drawing, bonded hard ferrite magnet exists in the holding furnace of control continuous casting drawing after the completion of toppling over
1340℃；Supply molten iron as needed；Molten iron stops 3 minutes after injecting in the holding furnace of continuous casting drawing, and then starting is horizontal
The drawing equipment of continuous casting drawing, the drawing equipment is walked by step-length 35mm/ and carries out drawing in a manner of drawing-stop-draw, in drawing
The leaving water temperature of the recirculated water in the water cooling graphite crystallizer is controlled in the process not higher than 50 DEG C.
The drawing equipment includes traction link seat and master operation disk, and when drawing waits for that the traction link seat starting is stablized, red
It after the profile upper roller of heat, according to the color that the step-length of pull-out is shown, determines a need for raising speed, then determines the master control behaviour
Make drawing and the parameter normally produced stopped on disk.The traction link seat includes drawing head, in strict accordance with type of production before production
The size of material makes drawing head.The sizeable water cooling graphite crystallizer of simultaneous selection.It is fed in the holding furnace to continuous casting drawing
When molten iron, the time interval controls of molten iron are fed every time at 9 minutes.
Such profile section section is larger, and liquid heart distance far except drawing outlet can still exist.When production never
Drawing speed is fast, and liquid level is excessively low, will affect the quality of fractography, while paying attention to the recirculated water in water cooling graphite crystallizer
Water, hydraulic pressure, water temperature control, it is small with the colour contrast of outlet end profile, it is relatively uniform be standard, forbid drawing speed mistake
Fastly, it is easy to keep the crystallization shell of profile formation thin in this way and the wick-containing of large area is formed, profile coagulates outside water cooling graphite crystallizer
Gu when be easy expansion lose circle.
The pig iron uses pig iron Q10, and the pig iron Q10 is composed of the following components in mass ratio: carbon: 4.4%, silicon:
0.095%, phosphorus: 0.036%, manganese: 0.086%, sulphur: 0.018%, titanium: 0.052%, remaining is iron.The steel scrap is in mass ratio
It is composed of the following components: carbon: 0.41%, silicon: 0.16%, phosphorus: 0.036%, manganese: 0.49%, sulphur: 0.022%, titanium:
0.042%, remaining is iron.The foundry returns is composed of the following components in mass ratio: carbon: 3.5%, silicon: and 2.65%, phosphorus:
0.046%, manganese: 0.32%, sulphur: 0.011%, remaining is iron.The carburant is the low-sulfur carburant after high temperature graphitization, is contained
Carbon amounts is 95% or more.The nodulizer is rare earth magnesium ferrosilicon alloy, and the granule size of the nodulizer is 10-30mm, described
Nodulizer is composed of the following components in mass ratio: magnesium: 6%-6.5%；Silicon: 41-44%；Remaining is iron.The silicon-iron block is 75#
Silicon-iron block, the silicon-iron block granule size are 15-35mm, and the silicon-iron block is composed of the following components in mass ratio: silicon: 65%-
75%, remaining is iron.The inovulant is barium ferrosilicon, and the granule size of the inovulant is 3-8mm, and the inovulant presses quality
Than composed of the following components: silicon: 70%-75%, calcium: 0.8%-2.2%, aluminium: 1%-2%, barium: 4%-6%, remaining is iron.
Principle: carburant forms the micro- granule of carbon in iron liquid in preparation process, has to the formation of graphite good
Inoculation(effect) especially increases and uses carburant, and inoculation(effect) becomes apparent, and melts the carbon to be formed using the disperse of carburant
Micro- granule, can be used as the graphite crystal nucleus that breeds in process of setting, and this graphite crystal nucleus property that breeds is stablized, had absolutely
It is long-acting breed property and promote nodularization effect, the nodularization and inoculation fade that big cross section center portion liquid can be prevented intracardiac, simultaneously
Due to breeding the increase of graphite crystal nucleus, limited carbon is assigned to the breeding on graphite crystal nucleus of increment, and the average diameter grown up subtracts
It is small.The small graphite buoyancy of diameter is also small, it is not easy to and movement of floating occurs, graphite can be effectively reduced and converge combined probability,
Prevent the distortion and floating of graphite.This to obtain greater number of graphite within big cross section center portion, and graphite nodule rate is high, graphite
Roundness it is high, graphite is tiny.Cast iron entirety Oxygen potential is low, and spheroidal graphite is coarse, and the situation of graphite deformity is prevented, thus greatly
The quality of profile is improved greatly.
Embodiment 6
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, using natural
Gas toasts the holding furnace of continuous casting drawing, and baking time is 4 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 550 DEG C；
(2) ingredient is weighed the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by the calculating of following target value
The above metal material: carbon: 3.62%, silicon: 1.38%, manganese: 0.40%, wherein the selection amount of the pig iron is ingredient gross mass
52%, the selection amount of steel scrap is the 32% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block
And manganese iron puts into medium-frequency induction furnace melting, the carburant additional amount is the 0.82% of molten steel quality, and molten iron is increased to
1530 DEG C, after the completion of overheat, it is transferred to the holding furnace of the continuous molten iron discharging in ladle, the guarantor with the continuous molten iron discharging in ladle
The iron liquid mixing stored in warm furnace, while temperature is down to 1440 DEG C of temperature properly to come out of the stove；
(4) it liquid iron balling and breeds, weighs the nodulizer, silicon-iron block and inovulant of calculation amount with pouring method in ladle
It carries out nodularization and breeds, nodulizer additional amount is the 1.9% of molten steel quality, and silicon-iron block additional amount is the 0.6% of molten steel quality, institute
It states silicon-iron block and is divided into two parts addition, a part is added in smelt stage, and additive amount is to reach silicone content in step (2) to require
Silicon amount, another part is covered on nodulizer in spheroidising, and innoculant adding quantity is the 0.5% of molten steel quality；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make in molten iron respectively
The mass percent of element are as follows: carbon: 3.48%, silicon: 2.65%, manganese: 0.37%, magnesium: 0.048%, phosphorus: 0.035%, sulphur:
0.01%, remaining is iron；
(6) horizontal casting drawing: having taken off after slag and carried out temperature test to molten iron, and molten iron temperature controls between 1390 DEG C,
Then holding furnace that molten iron is poured into continuous casting drawing, bonded hard ferrite magnet exists in the holding furnace of control continuous casting drawing after the completion of toppling over
1345℃；Supply molten iron as needed；Molten iron stops 3 minutes after injecting in the holding furnace of continuous casting drawing, and then starting is horizontal
The drawing equipment of continuous casting drawing, the drawing equipment is walked by step-length 45mm/ and carries out drawing in a manner of drawing-stop-draw, in drawing
The leaving water temperature of the recirculated water in the water cooling graphite crystallizer is controlled in the process not higher than 50 DEG C.
The drawing equipment includes traction link seat and master operation disk, and when drawing waits for that the traction link seat starting is stablized, red
It after the profile upper roller of heat, according to the color that the step-length of pull-out is shown, determines a need for raising speed, then determines the master control behaviour
Make drawing and the parameter normally produced stopped on disk.The traction link seat includes drawing head, in strict accordance with type of production before production
The size of material makes drawing head.The sizeable water cooling graphite crystallizer of simultaneous selection.It is fed in the holding furnace to continuous casting drawing
When molten iron, the time interval controls of molten iron are fed every time at 10 minutes.
Such profile section section is larger, and liquid heart distance far except drawing outlet can still exist.When production never
Drawing speed is fast, and liquid level is excessively low, will affect the quality of fractography, while paying attention to the recirculated water in water cooling graphite crystallizer
Water, hydraulic pressure, water temperature control, it is small with the colour contrast of outlet end profile, it is relatively uniform be standard, forbid drawing speed mistake
Fastly, it is easy to keep the crystallization shell of profile formation thin in this way and the wick-containing of large area is formed, profile coagulates outside water cooling graphite crystallizer
Gu when be easy expansion lose circle.
The pig iron uses pig iron Q10, and the pig iron Q10 is composed of the following components in mass ratio: carbon: 4.4%, silicon:
0.095%, phosphorus: 0.036%, manganese: 0.086%, sulphur: 0.018%, titanium: 0.052%, remaining is iron.The steel scrap is in mass ratio
It is composed of the following components: carbon: 0.41%, silicon: 0.16%, phosphorus: 0.036%, manganese: 0.49%, sulphur: 0.022%, titanium:
0.042%, remaining is iron.The foundry returns is composed of the following components in mass ratio: carbon: 3.5%, silicon: and 2.65%, phosphorus:
0.046%, manganese: 0.32%, sulphur: 0.011%, remaining is iron.The carburant is the low-sulfur carburant after high temperature graphitization, is contained
Carbon amounts is 95% or more.The nodulizer is rare earth magnesium ferrosilicon alloy, and the granule size of the nodulizer is 10-30mm, described
Nodulizer is composed of the following components in mass ratio: magnesium: 6%-6.5%；Silicon: 41-44%；Remaining is iron.The silicon-iron block is 75#
Silicon-iron block, the silicon-iron block granule size are 15-35mm, and the silicon-iron block is composed of the following components in mass ratio: silicon: 65%-
75%, remaining is iron.The inovulant is barium ferrosilicon, and the granule size of the inovulant is 3-8mm, and the inovulant presses quality
Than composed of the following components: silicon: 70%-75%, calcium: 0.8%-2.2%, aluminium: 1%-2%, barium: 4%-6%, remaining is iron.
Principle: carburant forms the micro- granule of carbon in iron liquid in preparation process, has to the formation of graphite good
Inoculation(effect) especially increases and uses carburant, and inoculation(effect) becomes apparent, and melts the carbon to be formed using the disperse of carburant
Micro- granule, can be used as the graphite crystal nucleus that breeds in process of setting, and this graphite crystal nucleus property that breeds is stablized, had absolutely
It is long-acting breed property and promote nodularization effect, the nodularization and inoculation fade that big cross section center portion liquid can be prevented intracardiac, simultaneously
Due to breeding the increase of graphite crystal nucleus, limited carbon is assigned to the breeding on graphite crystal nucleus of increment, and the average diameter grown up subtracts
It is small.The small graphite buoyancy of diameter is also small, it is not easy to and movement of floating occurs, graphite can be effectively reduced and converge combined probability,
Prevent the distortion and floating of graphite.This to obtain greater number of graphite within big cross section center portion, and graphite nodule rate is high, graphite
Roundness it is high, graphite is tiny.Cast iron entirety Oxygen potential is low, and spheroidal graphite is coarse, and the situation of graphite deformity is prevented, thus greatly
The quality of profile is improved greatly.
Embodiment 7
The present embodiment with embodiment 3-6 in order to be contrasted, thus by the variation bring of the selection amount of each raw material
Effect is highlighted provided with following comparative example.
Comparative example 1:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, exists with the difference of embodiment 3-6,
The pig iron is different with the selection amount of steel scrap in step (2), and wherein the selection amount of the pig iron is the 75% of ingredient total amount, the selection amount of steel scrap
It is the 15% of ingredient gross mass.To obtain comparison scheme 1-4.
Comparative example 2:
A kind of preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, exists with the difference of embodiment 3-6,
The additional amount of carburant reduces in step (2), i.e., the additional amount of the described carburant is the 0.6% of molten iron gross mass,.To obtain
Comparison scheme 5-8.
By big the breaking of the embodiment 3-6 ferrite ductile cast iron profile prepared and comparative example 1 and 2 (i.e. comparison scheme 1-8)
Face high-intensity and high-tenacity spheroidal graphite cast-iron profile is tested for the property to be detected with metallographic, and the specific detection method is as follows:
1, tensile strength, yield strength and elongation test
(1) it samples, the sample longitudinally cut at the center of radius of profile along profile；
(2) it tests, test is tested using universal testing machine, and test method is ordinary test method.
2, hardness test
Hardness test experimental principle:
Measurement method for Brinell hardness principle is that the sintered carbide ball of certain diameter is applied to test force pressing in sample surface warp
After the defined retention time, removal test force measures the diameter of specimen surface impression.
The area of indentation can be calculated by pressure head bulb diameter D and the resulting sample impression diameter d of measurement, it may be assumed that S=
Then ball hardness number can be calculated by following formula: Brinell hardness=constant × test force/indentation surface product, it may be assumed that
In above formula: d=(d1+d2)/2；D, d unit are mm；F unit is N.
HBE-3000M Brinell hardness tester use brineling principle, brineling can be carried out, be suitable for without
The materials such as hardened steel, cast iron, non-ferrous metal and the softer bearing metal of quality.With measuring accuracy height, measurement range is wide, test
Power loads automatically, automatically keeps the features such as timing, automatic unloading.
This hardometer institute tape reading microscope is 20 times, and drum minimum scale value is 0.005mm, and when use should rationally utilize
Light source.It, can also be using the reading plotter of other bigger amplification factors to improve reading accuracy when measuring smaller impression diameter.
It should ensure that impression diameter between 0.24D-0.6D using the selection of test force when the machine；Test force-pressure head diameter
Square ratio (0.102F/D2) should be selected according to material and hardness, when specimen size allows, the preferential ball pressure for selecting 10mm
Head.
Experimental procedure:
(1) test equipment checks the power supply line connected, turns on the power switch that power supply indicator is bright.Testing machine carries out certainly
Inspection resets, and shows the current test force retention time, the state before parameter automatic Memory shutdown.
(2) pressure head is installed, then the pressure head chosen uses cotton or other with the antirust oil of its adherency of alcohol washes
Soft cloth wiped clean is packed into spindle hole, and rotation holding screw makes it gently be pressed on the flat place of pressure head caudal peduncle；Sample is put down simultaneously
Surely, closely sealed to be placed in sample stage.Handwheel is rotated clockwise, increase sample stage, sample is contacted with pressure head, until handwheel and spiral shell
Mother produces relative sliding (skidding), finally screws pressure head holding screw.
(3) Selection experiment power, hardometer can provide 5 kinds of test forces for selecting, counterweight 7 be shared, wherein 1 1.25kg
Counterweight, 1 5kg counterweight, 5 10kg counterweights realize 5 kinds of test forces by the combination of counterweight.
(4) the test force retention time is arranged, and standard block of hardness is placed on sample stage center, smooth rotation hand clockwise
Wheel, rises sample stage, sample is contacted with pressure head；Until handwheel and nut produce relative sliding (skidding), that is, stop operating hand
Wheel." beginning " key is pressed at this time, on-test automatic running is successively automatically performed following procedure: test force load (load indicator light
It is bright)；Test force starts the retention time countdown by setting after adding completely, keep the test force (keeping indicator light bright)；When
Between unloading (unloading indicator light bright) is immediately begun to after, restPose (power supply indicator is bright) after completing unloading.
(5) it tests, tested sample is placed on sample stage center, tests out the hardness number of sample, institute according to the method described above
State the hardness number for the top edge that hardness number includes sample, the hardness number at upper the 1/4 of sample center, the core rigidities value of sample,
Hardness number at lower the 1/4 of sample center, the hardness number at the lower edge of sample, sample left edge at hardness number, sample
Hardness number at the left side 1/4 at center, the hardness number at the right side 1/4 at sample center, the hardness number of the right edge of profile, thus
Obtain the hardness fluctuations range of sample.
3, graphite size and Oxygen potential detection test
The detection test of graphite size and Oxygen potential is detected according to GB/T9441-2009 regulation.
(1) it samples, intercepts test disk from section material section, the test disk is respectively from section material section edge, radius
Between and middle part interception；
(2) print is handled, and test disk is carried out rough lapping, fine lapping, polishing treatment in order；
(3) it observes and obtains a result, provide to be evaluated by step according to GB/T9441-2009.
The assessment method of graphite size: being evaluated using image analyzer, directly carries out threshold segmentation in the case where polishing state
Graphite nodule is extracted, chooses representative visual field, calculated diameter is greater than the average value of the diameter of graphite ball of the maximum graphite radius of a ball, right
According to the grading table evaluation in GB/T9441-2009.
The assessment method of Oxygen potential: being evaluated using image analyzer, and threshold segmentation is directly carried out in the case where polishing state and is mentioned
Graphite nodule is taken, Oxygen potential and evaluation rank are calculated.Entire subject face is looked first at when observation, and the visual field of three nodularization differences is selected to carry out
Measurement, is averaged, and compares the grading table evaluation in GB/T9441-2009.
By above-mentioned test, shown in each test result following table for testing profile:
The requirement that QT500-7 material capability should reach is tensile strength (MPa): >=500, yield strength (MPa): >=
320, elongation (%): >=7, hardness: 170-230HB.
By above-mentioned test result, it is found that Large-cross-section nodular cast iron of the invention has, intensity is high, toughness is strong, Oxygen potential
Height, the small feature of graphite diameter, profile are had excellent performance.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the protection scope of invention.
Claims (10)
1. a kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile, which is characterized in that the profile is by following elements according to matter
Amount percentage is prepared: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium:
0.04%-0.06%, phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron.
2. big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 1, which is characterized in that the profile be by
Following elements are prepared according to mass percent: carbon: 3.48%, silicon: and 2.65%, manganese: 0.37%, magnesium: 0.048%, phosphorus:
0.035%, sulphur: 0.01%, remaining is iron.
3. the preparation method based on big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile described in claim 1, it is characterised in that:
Specifically includes the following steps:
(1) stokehold prepares, and combines water cooling graphite crystallizer after the installation is completed with the holding furnace of continuous casting drawing, is dried using natural gas
The holding furnace of roasting continuous casting drawing, baking time are 3-5 hours, and the temperature before producing in the holding furnace of continuous casting drawing is 500-600
℃；
(2) ingredient, by the pig iron, steel scrap, foundry returns, carburant, silicon-iron block and manganese iron by following target value calculating weigh it is above
Metal material: carbon: 3.55%-3.65%, silicon: 1.3%-1.4%, manganese: 0.32%-0.42%, wherein the selection amount of the pig iron be
The 50%-55% of ingredient gross mass, the selection amount of steel scrap are the 30%-35% of ingredient gross mass；
(3) melting, using medium-frequency induction furnace melting, by the load weighted pig iron, steel scrap, foundry returns, carburant, silicon-iron block and
Manganese iron puts into medium-frequency induction furnace melting, and the additional amount of the carburant is the 0.7%-0.82% of molten iron gross mass, molten iron liter
Height arrives between 1500-1550 DEG C, after the completion of overheat, the holding furnace of the continuous molten iron discharging in ladle is transferred to, with continuous past molten iron
The iron liquid mixing stored in the holding furnace of molten iron discharging in wrapping, while temperature is down to 1430-1450 DEG C of temperature range properly to come out of the stove；
(4) it liquid iron balling and breeds, the nodulizer, silicon-iron block and inovulant for weighing calculation amount are carried out with method is poured in ladle
It nodularization and breeds, nodulizer additional amount is the 1.7%-1.9% of molten steel quality, and silicon-iron block additional amount is the 0.4%- of molten steel quality
0.6%, the silicon-iron block is divided into two parts addition, and a part is added in smelt stage, and additive amount is that silicone content is made to reach step
(2) the silicon amount required in, another part are covered on nodulizer in spheroidising, and innoculant adding quantity is molten steel quality
0.4%-0.6%；
(5) it detects, the molten iron sample examination after inoculation, and supplement related ingredient according to result of laboratory test to make each element in molten iron
Mass percent are as follows: carbon: 3.45%-3.55%, silicon: 2.60%-2.70%, manganese: 0.30%-0.40%, magnesium: 0.04%-
0.06%, phosphorus: 0.025%-0.06%, sulphur: 0.008%-0.015%, remaining is iron；
(6) horizontal casting drawing: having taken off after slag and carried out temperature test to molten iron, and molten iron temperature controls between 1375-1390 DEG C,
Then holding furnace that molten iron is poured into continuous casting drawing, bonded hard ferrite magnet exists in the holding furnace of control continuous casting drawing after the completion of toppling over
1335-1350℃；Supply molten iron as needed；Molten iron stops 3 minutes after injecting in the holding furnace of continuous casting drawing, then starts
The drawing equipment of horizontal casting drawing, the drawing equipment are walked by step-length 35-50mm/ and are drawn in a manner of drawing-stopping-draw
It pulls out, controls the leaving water temperature of the recirculated water in the water cooling graphite crystallizer during the drawing process not higher than 50 DEG C.
4. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
The pig iron, steel scrap, the foundry returns amount of weighing are weighed by following mass parts ratio in ingredient after weighed furnace in step (2): the pig iron: useless
Steel: foundry returns is 55:35:15.
5. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
The pig iron described in step (2) is pig iron Q10.
6. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
Nodulizer described in step (4) is rare earth magnesium ferrosilicon alloy, and the granule size of the nodulizer is 10-30mm, the nodulizer
Additional amount is the 1.8% of molten steel quality.
7. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
Silicon-iron block described in step (4) is 75#Silicon-iron block, the silicon-iron block granule size are 15-35mm, the additional amount of the silicon-iron block
It is the 0.5% of molten steel quality.
8. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
Inovulant described in step (4) is barium ferrosilicon, and the granule size of the inovulant is 3-8mm, and the innoculant adding quantity is iron
The 0.5% of water quality.
9. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, it is characterised in that:
Drawing equipment described in step (6) includes traction link seat and master operation disk, and when drawing waits for that the traction link seat starting is stablized, red
It after the profile upper roller of heat, according to the color that the step-length of pull-out is shown, determines a need for raising speed, then determines the master control behaviour
Make drawing and the parameter normally produced stopped on disk.
10. the preparation method of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile according to claim 3, feature exist
In: when feeding molten iron to the holding furnace of continuous casting drawing in step (6), the time interval controls of molten iron are fed every time at 9-11 points
Clock.
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| CN112813339A (en) * | 2020-12-30 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Preparation method of ductile iron vertical roll for tropical vertical rolling mill |
| CN113500171A (en) * | 2021-06-16 | 2021-10-15 | 西安理工大学 | Preparation method of iron-based continuous casting profile based on graphite nodule ultrafine grinding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112813339A (en) * | 2020-12-30 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Preparation method of ductile iron vertical roll for tropical vertical rolling mill |
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| CN113500171A (en) * | 2021-06-16 | 2021-10-15 | 西安理工大学 | Preparation method of iron-based continuous casting profile based on graphite nodule ultrafine grinding |
| CN113500171B (en) * | 2021-06-16 | 2022-07-01 | 西安理工大学 | Preparation method of iron-based continuous casting profile based on graphite nodule ultrafine grinding |
| CN115094323A (en) * | 2022-06-28 | 2022-09-23 | 西安理工大学 | Low-friction cutter material for slitting aluminum packaging material and preparation method |
| CN115007820A (en) * | 2022-07-28 | 2022-09-06 | 西北工业大学 | Ultrasonic continuous casting method and system for reducing wall thickness sensitivity of spherical graphite tissue |
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