CN108441752A - A kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof - Google Patents
A kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof Download PDFInfo
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- CN108441752A CN108441752A CN201810565342.6A CN201810565342A CN108441752A CN 108441752 A CN108441752 A CN 108441752A CN 201810565342 A CN201810565342 A CN 201810565342A CN 108441752 A CN108441752 A CN 108441752A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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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
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- 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
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- 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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to spheroidal graphite cast-iron technical fields, and in particular to a kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof；The mass percent of each element ingredient is in spheroidal graphite cast-iron：C：3.2 3.6%, Si：2.8 3.2%, Cr：0.4 0.8%, Mn：0.2 0.6%, Al：0.2 0.8%, Ni：0.2 0.8%, Mg：0.2 0.8%, Cu：0.2 0.6%, Mo：0.2 0.4%, Ta：0.08 0.10%, Y：0.04 0.06%, Sb：0.02 0.03%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable impurity；The present invention provides a kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof, by reasonably optimizing each element ingredient and content, obtained spheroidal graphite cast-iron has high intensity, high tenacity and wearability, while having higher heat-resisting quantity, extends the service life of the brake disc of automobile when in use.
Description
Technical field
The present invention relates to spheroidal graphite cast-iron technical fields, and in particular to a kind of automobile brake disc spheroidal graphite cast-iron and its preparation side
Method.
Background technology
The birth of automobile has had century-old history, quickly grows, has become the most important vehicles in the world at present
It lives indispensable important component with the important driving force spurred economic growth and people.Casting is automobile product
One of important composition of parts, application of the cast product on auto parts and components occupy an important position.The master of automotive castings
It is complex-shaped to want feature, wall thickness is relatively thin, dimensional accuracy is high, production is of large quantities, requires reliability very high etc..Automobile will use up can
The low mitigation own wt of energy, it is desirable to which casting should be light, also to there is very high intensity.The material of past many auto parts and components
It is gray cast iron, is nowadays mostly changed to nodular iron casting.
Brake disc, that is, brake disc is a rosette, is with alloy steel making and to be fixed on wheel, is turned with wheel
It is dynamic.Brake caliper clamps brake disc and plays the role of slowing down or stopping when touching on the brake in vehicle travel process.General brake disc
On have a circular hole, effect is to mitigate weight and increase frictional force.Brake disc type is various, and feature is that wall is thin, at disc and center
It is formed by sand core.Variety classes brake disc has differences, the thickness of hub on disk diameter, disc thickness and two panels gap size
It is highly also different.The very big normal force and tangential force that brake disc is not only applied by brake block at work, but also
The thermic load more much bigger than brake drum is born, hot face temperature can reach 800 DEG C, the possible warpage under high temperature action, from
And cause to generate frictional noise and scratch.
As the Chinese invention patent of Publication No. CN106048405A discloses a kind of automobile brake disc heat resistant and wear resistant
The weight percent of nodular cast iron part and preparation method thereof, each chemical constituent is：C 3.3-3.6%, Si 1.9-2.3%, Mo
0.7-0.9%, Mn 0.2-0.4%, Se 0.1-0.2%, Ta 0.05-0.1%, Cd 0.2-0.3%, Sb 0.03-
0.05%, Er0.04-0.08, P≤0.04%, S≤0.02%, surplus Fe.
The automobile brake disc of foregoing invention heat resistant and wear resistant nodular cast iron part, through examining, mechanical property is：Tension is strong
Spend 883Mpa, yield strength 746Mpa, elongation 12.5%, Brinell hardness 472HBW, 800 DEG C of cracked cycle-indexes：
616 times.But in the invention, the various performances of cast iron are relatively low, cannot still fully meet the property of automobile brake disc spheroidal graphite cast-iron
It can require.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof,
By reasonably optimizing each element ingredient and content, obtained spheroidal graphite cast-iron has high intensity, high tenacity and wearability, simultaneously
With higher heat-resisting quantity, the service life of the brake disc of automobile when in use is extended.
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.2-3.6%, Si：2.8-3.2%, Cr：0.4-0.8%, Mn：0.2-0.6%, Al：0.2-0.8%, Ni：0.2-0.8%,
Mg：0.2-0.8%, Cu：0.2-0.6%, Mo：0.2-0.4%, Ta：0.08-0.10%, Y：0.04-0.06%, Sb：0.02-
0.03%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, it is 1500-1550 DEG C the pig iron, steel scrap, foundry returns to be added in intermediate frequency furnace in temperature by predetermined formulation
Under the conditions of carry out melting, the content of each element in molten iron is detected after melting, and adjust each element content until meet recipe requirements,
It taps a blast furnace when iron water amount in ladle reaches required weight and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.4-1.6% is added, so
It skims afterwards to molten iron；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 900-950 DEG C, kept the temperature 2-4h, then wait for
Furnace temperature is cooled to 700-750 DEG C, and heat preservation 2-3h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite casting of the present invention
Iron.
Preferably, the constituent of nodulizer is：Mg：7-9%, Ca:2-4%, Ti:0.2-0.4%, V:0.3-0.5%,
Nb:0.1-0.3%, Ce:0.1-0.3%, surplus are Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：50-70%, Ca:2-4%, Ba:0.3-0.5%, Mg:
0.3-0.5%, W:0.1-0.3%, surplus are Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：70-90%, Ca:2-4%, Al:0.4-0.6%, Ce:
0.1-0.3%, Re:0.1-0.3%, surplus are Fe and inevitable impurity.
Preferably, the mass percent of each element ingredient is in spheroidal graphite cast-iron：C：3.5%, Si：3.2%, Cr：0.8%,
Mn：0.2%, Al：0.4%, Ni：0.4%, Mg：0.2%, Cu：0.6%, Mo：0.4%, Ta：0.10%, Y：0.04%, Sb：
0.03%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable impurity.
Advantageous effect：
Si contents cannot be too low in the spheroidal graphite cast-iron of the present invention, and deoxidant element when Si is as melting can prevent other
Alloying element aoxidize, while Si be promote graphitization, inhibit or postpone carbide row at element, can not be excessively high, content
The excessively high quenching degree that can reduce cast iron, thus by it is appropriate raising spheroidal graphite cast-iron in Si content and simultaneously be added to Mo, Ta,
The collaboration of the elements such as Y uses, and wherein the presence of Mo elements can increase the chemical stability of carbide, and can improve cast iron
Quenching degree and high temperature abrasion resistance；Ta elements can improve matrix and morphology of carbides, and can improve spheroidal graphite cast-iron
Intensity and toughness；Y element can promote structural transformation, can be adsorbed on the solid-state nucleating surface grown up, and hinder crystal growth,
So as to crystal grain thinning, inhibits temper brittleness, improve thermoplasticity, heat resistance, wearability and the inoxidizability of cast iron；Pass through
The content of the elements such as rational addition and optimization Mo, Ta, Y, to improve the high temperature resistance of spheroidal graphite cast-iron；Pass through addition
The elements such as Al, Ni, Cu, Sb, wherein Al elements can promote graphitizing, significantly refine as-cast grain, in addition with the parent of oxygen
Strongly with power, highly dispersed free alumina particle of generation, can be as the graphite nuclei in heat treatment process；Ni
Element is graphite element, can be dissolved in spheroidal graphite cast-iron iron liquid and unlimitedly in solid-state iron liquid, will not with carbon row at
Compound, it is possible to reduce or the row of free cementite is eliminated at reduction spoken parts in traditional operas and brittle transition temperature are strengthened matrix, carried
The intensity and impact flexibility of high cast iron；Cu elements can reduce the binding force between Fe and C atoms, promote graphitization, improve stone
The form of ink, and Cu elements can hinder ferritic row at promoting the row of pearlite at improving the quality of nodularization；Sb
Element can strongly facilitate the row of pearlite into refinement graphite nodule；By adding the collaboration of the elements such as Al, Ni, Cu, Sb using simultaneously
Reasonably optimize its content, improves the wear-resisting property of spheroidal graphite cast-iron；During carrying out nodularization and inoculation, pass through addition
Nodulizer and inovulant, increase the ability of graphite forming core, crystal grain thinning, improve the intensity, toughness of cast iron, wearability and resistance to
It is high temperatures；In carrying out heat treatment process, by reasonably optimizing the modes such as furnace temperature, time, it is effectively improved spheroidal graphite cast-iron
Wearability and heat-resisting quantity.The present invention has by reasonably optimizing each element ingredient and content, obtained spheroidal graphite cast-iron
High intensity, high tenacity and wearability, while there is higher heat-resisting quantity, extend the longevity of the brake disc of automobile when in use
Life.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment 1：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.4%, Si：2.9%, Cr：0.4%, Mn：0.3%, Al：0.2%, Ni：0.6%, Mg：0.4%, Cu：0.5%, Mo：
0.3%, Ta：0.08%, Y：0.05%, Sb：0.02%, S≤0.02%, P≤0.04%, surplus be Fe and inevitably
Impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1500 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.4% is added, it is then right
Molten iron is skimmed；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 900 DEG C, kept the temperature 2h, then wait for that furnace temperature is cold
But to 700 DEG C, heat preservation 2h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
Preferably, the constituent of nodulizer is：Mg：8%, Ca:3%, Ti:0.3%, V:0.2%, Nb:0.1%, Ce:
0.25%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：50%, Ca:2%, Ba:0.3%, Mg:0.35%, W:
0.25%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：75%, Ca:2%, Al:0.5%, Ce:0.2%, Re:
0.15%, surplus is Fe and inevitable impurity.
Embodiment 2：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.5%, Si：3.2%, Cr：0.8%, Mn：0.2%, Al：0.4%, Ni：0.4%, Mg：0.2%, Cu：0.6%, Mo：
0.4%, Ta：0.10%, Y：0.04%, Sb：0.03%, S≤0.02%, P≤0.04%, surplus be Fe and inevitably
Impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1520 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.5% is added, it is then right
Molten iron is skimmed；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 920 DEG C, kept the temperature 3h, then wait for that furnace temperature is cold
But to 720 DEG C, heat preservation 2.5h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
Preferably, the constituent of nodulizer is：Mg：7.5%, Ca:2%, Ti:0.4%, V:0.15%, Nb:
0.25%, Ce:0.1%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：60%, Ca:4%, Ba:0.5%, Mg:0.3%, W:
0.1%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：80%, Ca:3.5%, Al:0.4%, Ce:0.15%, Re:
0.3%, surplus is Fe and inevitable impurity.
Embodiment 3：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.2%, Si：2.7%, Cr：0.6%, Mn：0.6%, Al：0.8%, Ni：0.2%, Mg：0.8%, Cu：0.2%, Mo：
0.4%, Ta：0.09%, Y：0.05%, Sb：0.025%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable
Impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1530 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.45% is added, then
It skims to molten iron；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 920 DEG C, kept the temperature 2.5h, then wait for furnace temperature
720 DEG C are cooled to, heat preservation 2.5h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
Preferably, the constituent of nodulizer is：Mg：7%, Ca:2.5%, Ti:0.5%, V:0.3%, Nb:0.3%,
Ce:0.3%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：55%, Ca:3.5%, Ba:0.45%, Mg:0.45%, W:
0.15%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：70%, Ca:3%, Al:0.55%, Ce:0.3%, Re:
0.25%, surplus is Fe and inevitable impurity.
Embodiment 4：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.6%, Si：3.1%, Cr：0.7%, Mn：0.4%, Al：0.6%, Ni：0.8%, Mg：0.4%, Cu：0.4%, Mo：
0.2%, Ta：0.08%, Y：0.06%, Sb：0.025%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable
Impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1540 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.5% is added, it is then right
Molten iron is skimmed；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 940 DEG C, kept the temperature 3.5h, then wait for furnace temperature
740 DEG C are cooled to, heat preservation 2.5h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
Preferably, the constituent of nodulizer is：Mg：9%, Ca:4%, Ti:0.35%, V:0.25%, Nb:0.2%,
Ce:0.15%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：70%, Ca:2%, Ba:0.35%, Mg:0.5%, W:
0.2%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：90%, Ca:4%, Al:0.6%, Ce:0.25%, Re:
0.10%, surplus is Fe and inevitable impurity.
Embodiment 5：
A kind of automobile brake disc spheroidal graphite cast-iron, the mass percent of each element ingredient is in the spheroidal graphite cast-iron：C：
3.3%, Si：2.8%, Cr：0.5%, Mn：0.5%, Al：0.4%, Ni：0.6%, Mg：0.6%, Cu：0.3%, Mo：
0.3%, Ta：0.10%, Y：0.04%, Sb：0.025%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable
Impurity.
A kind of preparation method of automobile brake disc spheroidal graphite cast-iron, includes the following steps：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1550 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.6% is added, it is then right
Molten iron is skimmed；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron,
Second of inoculation is carried out, is cast；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 950 DEG C, kept the temperature 4h, then wait for that furnace temperature is cold
But to 750 DEG C, heat preservation 3h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
Preferably, the constituent of nodulizer is：Mg：8.5%, Ca:3.5%, Ti:0.45%, V:0.1%, Nb:
0.15%, Ce:0.2%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the first inovulant is：Si：65%, Ca:3%, Ba:0.4%, Mg:0.4%, W:
0.3%, surplus is Fe and inevitable impurity.
Preferably, the constituent of the second inovulant is：Si：85%, Ca:2.5%, Al:0.45%, Ce:0.1%, Re:
0.2%, surplus is Fe and inevitable impurity.
Spheroidal graphite cast-iron prepared by embodiment in the present invention 1,2,3,4,5 is subjected to data test, obtains indices number
According to such as following table：
To sum up, the embodiment of the present invention has the advantages that：The stretching of spheroidal graphite cast-iron prepared by the present invention and Bu Shi
Hardness is high, wearability is high, cycle-index cracked at 800 DEG C is less.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of automobile brake disc spheroidal graphite cast-iron according to claim 1, which is characterized in that each in the spheroidal graphite cast-iron
The mass percent of elemental composition is：C：3.2-3.6%, Si：2.8-3.2%, Cr：0.4-0.8%, Mn：0.2-0.6%, Al：
0.2-0.8%, Ni：0.2-0.8%, Mg：0.2-0.8%, Cu：0.2-0.6%, Mo：0.2-0.4%, Ta：0.08-0.10%,
Y：0.04-0.06%, Sb：0.02-0.03%, S≤0.02%, P≤0.04%, surplus are Fe and inevitable impurity.
2. a kind of preparation method of automobile brake disc spheroidal graphite cast-iron according to claim 1, which is characterized in that including with
Lower step：
A, the pig iron, steel scrap, foundry returns are added to the condition for being 1500-1550 DEG C in temperature in intermediate frequency furnace by predetermined formulation
Lower carry out melting, detects the content of each element in molten iron after melting, and adjusts each element content until meeting recipe requirements, waits for iron
It taps a blast furnace when iron water amount reaches required weight in water packet and carries out spheroidization and inoculation processing；
B, molten iron is poured into ladle, the nodulizer progress spheroidising for being equivalent to iron liquid quality 1.4-1.6% is added, it is then right
Molten iron is skimmed；
C, the first inovulant is added in ladle, carries out first time inoculation, the second inovulant is added before molten iron, carries out
Second of inoculation, casting；
D, the casting of cast molding is heat-treated, furnace temperature is first warming up to 900-950 DEG C, kept the temperature 2-4h, then wait for furnace temperature
It is cooled to 700-750 DEG C, heat preservation 2-3h comes out of the stove air-cooled when furnace temperature is cooled to 600 DEG C, obtains the spheroidal graphite cast-iron of the present invention.
3. a kind of preparation method of automobile brake disc spheroidal graphite cast-iron according to claim 2, it is characterised in that：The ball
The constituent of agent is：Mg：7-9%, Ca:2-4%, Ti:0.2-0.4%, V:0.3-0.5%, Nb:0.1-0.3%, Ce:
0.1-0.3%, surplus are Fe and inevitable impurity.
4. a kind of preparation method of automobile brake disc spheroidal graphite cast-iron according to claim 2, it is characterised in that：Described
The constituent of one inovulant is：Si：50-70%, Ca:2-4%, Ba:0.3-0.5%, Mg:0.3-0.5%, W:0.1-
0.3%, surplus is Fe and inevitable impurity.
5. a kind of preparation method of automobile brake disc spheroidal graphite cast-iron according to claim 2, it is characterised in that：Described
The constituent of two inovulants is：Si：70-90%, Ca:2-4%, Al:0.4-0.6%, Ce:0.1-0.3%, Re:0.1-
0.3%, surplus is Fe and inevitable impurity.
6. a kind of automobile brake disc spheroidal graphite cast-iron according to claim 1, it is characterised in that：It is each in the spheroidal graphite cast-iron
The mass percent of elemental composition is：C：3.5%, Si：3.2%, Cr：0.8%, Mn：0.2%, Al：0.4%, Ni：0.4%,
Mg：0.2%, Cu：0.6%, Mo：0.4%, Ta：0.10%, Y：0.04%, Sb：0.03%, S≤0.02%, P≤0.04%,
Surplus is Fe and inevitable impurity.
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