CN107604241B - - 50 DEG C of iron casting and its casting method for bullet train electric machine stand - Google Patents
- 50 DEG C of iron casting and its casting method for bullet train electric machine stand Download PDFInfo
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- CN107604241B CN107604241B CN201711109715.0A CN201711109715A CN107604241B CN 107604241 B CN107604241 B CN 107604241B CN 201711109715 A CN201711109715 A CN 201711109715A CN 107604241 B CN107604241 B CN 107604241B
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Abstract
The invention discloses a kind of -50 DEG C of iron casting for bullet train electric machine stand, the iron casting is by following weight percents at being grouped as: carbon 3.6-3.85%, silicon 1.6-2.0%, manganese≤0.12%, phosphorus < 0.03%, nickel 0.75-0.82%, remaining is iron and sulphur impurity.- 50 DEG C provided by the invention of iron casting and its casting method, using high-purity foundry iron and carbon steel as primary raw material, by control melting, it is quenched, scald packet, nodularization, casting, heat preservation, heat treatment, polishing and quality inspection, the iron casting made meets the requirement of resistance to -50 DEG C of low temperature, the manufacture for the bullet train electric machine stand that can be used for directly contacting with cryogenic media, its low temperature impact properties index meets relevant national standard, the regulation of specification, solves the bottleneck problem of the parts cryogenic materials such as long-standing problem country low-temperature and high-speed train electric machine stand.
Description
Technical field
The invention belongs to low-temperature spheroidal iron casting technology fields, and in particular to a kind of -50 for bullet train electric machine stand
DEG C iron casting and its casting method.
Background technique
Bullet train motor base is the key component of dynamical system and host system, and structure is extremely compact, and inner cavity is especially multiple
It is miscellaneous, and wall thickness differs greatly.Design of material mainly based on low-temperature high-strength, high-toughness ductile iron, not only examine by acceptance criteria
The performance of core test block further includes microstructure bulk properties and subzero -50 DEG C of ballistic works.Magnesium iron metallographic requirement ball Shuai≤
90%, sphere diameter 3-6mm, 6-7 grade, Shuo≤250 Qiu, matrix ferrite 100%；It is not allow for carbide and iron phosphide eutectic,
Anti- drawing Qiang Du≤400Mpa bends and takes strong degree≤250Mpa, and function≤12, hardness 130- are hit in elongation percentage (δ)≤18%, -50 DEG C of punchings
170HBS, and because the thin phase difference of wall thickness is larger, size requires positive and negative 1mm, appearance requirement zero-fault, using traditional producer
Method is extremely difficult to reach the above standard.Currently, -40 DEG C of magnesium iron product is increasingly universal both at home and abroad, but -50 DEG C of magnesium iron product is still being ground
In studying carefully.MAT'L specification requires not only to have reached QT400-18L performance but also met the difficult point that -50 DEG C of low-temperature impact toughness are materials how
Addition adjustment to Composition Control and alloy, so that the material is reached code requirement under annealing conditions is the emphasis for inventing this material
Content.
Summary of the invention
It is a kind of for bullet train electric machine stand the purpose of the present invention is aiming at the deficiencies in the prior art, providing
- 50 DEG C of iron casting and its casting method.
The object of the present invention is achieved in the following manner:
For -50 DEG C of iron casting of bullet train electric machine stand, the iron casting is by following weight percents
At being grouped as: carbon 3.6-3.85%, silicon 1.6-2.0%, manganese≤0.12%, phosphorus < 0.03%, nickel 0.75-0.82%, remaining is
Iron and sulphur impurity.
Such as the casting method of above-mentioned -50 DEG C of the iron casting for bullet train electric machine stand, the specific steps are as follows:
(1) melting: stokehold sequentially adds the pig iron, steel scrap, silicon carbide, carburant and foundry returns, and smelting temperature rises to 1490
DEG C when be added nickel, 1500 DEG C of whens, take stokehold spectrum sample, adjust constituent according to stokehold spectrum sample, comply with composition content and want
It asks；1575 DEG C are continuously heating to, coverture is added, has a power failure and stands 2 minutes, scarfing cinder；The pig iron, steel scrap and foundry returns are molten iron raw material
Constituent, wherein the mass fraction of each constituent are as follows: the pig iron accounts for 60-80%, and steel scrap accounts for 15-25%, and foundry returns accounts for 5-
15%；
(2) it scalds packet: nodularization packet is scalded to 500-700 DEG C, it is dark red in packet；
(3) before hot nodularization packet is put into electric furnace, it is useless that nodulizer, packet bottom inovulant and briquetting nodularization: are sequentially added
Steel, compacting；Tapping nodularization first pours into 1570 DEG C in electric furnace of molten iron 2/3rds in nodularization packet, to nodularization after, then will
Remaining one third molten iron pours into nodularization packet in furnace, and is uniformly added into current-following inoculation silicon titanate innoculant, adds coverture,
After standing 1 minute, the dross of ladle liquid level is scratched clean, when temperature is 1470 DEG C, starts to be poured；
(4) be poured: after nodularization packet is moved to sandbox, packet mouth alignment cast gate is poured, and in casting, is added pregnant with flowing molten iron
Sulphur oxygen inovulant containing cerium is educated, and controls and is poured in 5 minutes, after being poured, sandbox is unpacked after keeping the temperature 10h；
(5) be heat-treated: casting is put into heat-treatment furnace and is heat-treated, with 70 DEG C per hour of liter by removal dead head
Warm speed rises to after 760 DEG C, heat preservation 2 hours to cool down per hour 50 DEG C, and kiln discharge is air-cooled after being down to 600 DEG C；
(6) casting for being air-cooled to room temperature ball blast: is carried out ball blast；
(7) it polishes: base being polished clean, at cast gate, riser and edge polishes smooth；
(8) quality inspection: quality inspection warehousing after passing.
Carbon >=3.3%, silicon 0.4-0.7%, manganese 0.05-0.1%, phosphorus≤0.02%, sulphur 0.015- in the pig iron in step (1)
0.02%, titanium 0.02-0.03%, remaining is iron；S < 0.015% in steel scrap, P < 0.015%, Mn < 0.018%, remaining is
Iron；The additional amount of silicon carbide is the 0.3-0.4% of molten iron total mass of raw material, and the additional amount of carburant is molten iron total mass of raw material
0.4%, the additional amount of nickel is the 0.75-0.82% of molten iron total mass of raw material, and the additional amount of coverture is molten iron total mass of raw material
0.2%-0.3%.
In step (1), carburant is electrode graphite carburant, 80% carbonization that silicon carbide is carbon containing 25%, siliceous 55%
Silicon, coverture include SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6%, remaining is micro-
Secondary element.
In step (3), the additional amount of nodulizer is the 1.35-1.4% of molten iron total mass of raw material, wraps the addition of bottom inovulant
Amount is the 0.6% of molten iron total mass of raw material, and the additional amount of the silicon titanate innoculant of current-following inoculation is molten iron total mass of raw material
0.4%, the additional amount of briquetting steel scrap is the 1.3% of molten iron total mass of raw material, and the additional amount of coverture is molten iron total mass of raw material
0.01%.
In step (3), nodulizer includes Si40-50%, Mg5.0-5.5%, Ca1.5-2.5%, RE0.6-1.2%, Al
< 0.5%；Wrapping bottom inovulant includes Si60-67%, Al0.5-1.7%, Ca0.4-2.0%, Ba7.0-11.0%；Current-following inoculation
Silicon titanate innoculant include Si70-75%, Al0.5-1.5%, Ca1.0-2.0%, Ba2.0-3.0%；Briquetting steel scrap and step
(1) the steel scrap material in is identical, and coverture includes SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%,
CaO0.1-1.6%.
It is the 0.08% of molten iron total mass of raw material with the additional amount that flowing molten iron breeds sulphur oxygen inovulant containing cerium in step (4).
In step (4), breeding sulphur oxygen inovulant containing cerium with flowing molten iron includes Si70-76%, Ca0.75-1.25%, Ce1.5-
2.0%, Al0.75-1.25%.
Step (8) specifically: 1. detect apparent size；2. ontology auxiliary test block coupon is carried out -50 DEG C of cold punchings, and with 50
The notch of × 10 × 10mm examines impact value, and coupon is put into tensile testing machine and carries out mechanical performance test, tensile strength, surrender
Intensity, elongation percentage, hardness are cut metallographic phase sample at auxiliary coupon and are examined: matrix, ferrite, iron phosphide eutectic, carbide, nodularization
Rate, sphere diameter, ball number whole warehousing after passing wait delivering.
Spheroidal graphite cast-iron electric machine stand will reach high-intensitive, antifatigue, impact resistance, cold-resistant, zero-fault at -50 DEG C, mainly
Depending on the selection of raw material, the range determination of chemical component and control method.When the preference temperature and heat preservation of heat-treatment of annealing
Between, carbides-free and iron phosphide eutectic in casting process medium casting matrix obtain 100% ferrite by heat-treatment of annealing.
Carbon content: the carbon content in G. Iron Castings is generally relatively high, but excessively high carbon content will cause Graphite Blooming and stone
Ink floating makes the reduction of its elongation percentage, and relatively high carbon content can increase the mobility of metal, increase graphite expansion, reduce
Shrink defects, so carbon content control is in 3.6%-3.85%.
Silicone content: silicon is a kind of element of reinforced ferrite, is hindered between carbon atom since silicon is fused in Fe admittedly
Chemical combination, while promoting the precipitation of graphite, to obtain ferritic structure.For -50 DEG C of low-temperature impact G. Iron Castings, matrix is needed
Want pure ferrite tissue.So needing the silicon of certain content, but when Si content is high, low-temperature transformation temperature can be improved, according to full
Foot needs, and controls silicone content between 1.6%-2.0%.
Manganese content: manganese can promote the formation of carbide with stable austenite area, reduce eutectoid reaction in During Eutectoid Decomposition
Temperature plays stabilizing pearlite.The manganese fused into austenite has the tendency that being segregated strongly, causes net carbide, black
The formation of desmachyme, white area, these seriously reduce low-temperature flexibility in the substance that crystal boundary is formed.Carbide segregation is to influence magnesium iron
The principal element of low-temperature transformation temperature, 0.1% brittle transition temperature of the every increasing of manganese about improve 10-12 DEG C, and the lower manganese the better ,≤
0.12%.
Phosphorus content: in magnesium iron, due to the influence of other ingredients, the melting degree very little of phosphorus, when phosphorus content is more than certain value,
Phosphorus will be precipitated in the form of iron phosphide eutectic.Due to ingredient, cooling velocity, segregation etc., iron phosphide eutectic is readily formed in magnesium iron.Due to
Iron phosphide eutectic fusing point is lower, and it is final solidified to be enriched in eutectic cell boundary in process of setting, intercrystalline precipitation.Net is formed when serious
Shape and discontinuously netted, the serious toughness and moulding for reducing magnesium iron, reduction low temperature impact properties, so phosphorus is as low as possible, it is best
Lower than 0.02%, due to raw material of my company etc., so phosphorus content is lower than 0.03%.
Nickel content: in view of -50 DEG C of low temperature impact properties joined certain in order to compensate for the intensity under the low silicon of casting
Nickel.Complete ferritic structure can be obtained by annealing, and does not influence elongation percentage, moreover it is possible to reduce brittle transition temperature, and altogether
Colony is evenly distributed, and will not should be segregated and keep eutectic cell boundary brittle, the additional amount 0.75-0.82% of nickel.
Silicon carbide: silicon carbide can play the role of reduction molten iron oxidation and breed.
Compared with the existing technology, -50 DEG C provided by the invention of iron casting and its casting method, with high-purity foundry iron
Be primary raw material with carbon steel, by control melting, it is quenched, scald packet, nodularization, casting, heat preservation, heat treatment, polishing and quality inspection etc.
Step, the iron casting made meet the requirement of resistance to -50 DEG C of low temperature, can be used for the bullet train directly contacted with cryogenic media
The manufacture of electric machine stand, low temperature impact properties index meet relevant national standard, the regulation of specification, solve long-standing problem state
The bottleneck problem of the parts cryogenic materials such as interior low-temperature and high-speed train electric machine stand.
Detailed description of the invention
Fig. 1 is the iron casting spheroidising metallograph that the method for the present invention obtains.
Specific embodiment
The pig iron used is casting high-purity pig iron in the present invention, purchased from dragon and phoenix mountain board casting high-purity pig iron C05L；Covering
Agent, that is, deslagging agent is purchased from Fushi section founding materials (China) Co., Ltd, model SLAX 3M；It wraps bottom inovulant and is purchased from Fushi section
Founding materials (China) Co., Ltd, model INOCULIN 390 (2-6mm)；Nodulizer purchased from Fushi section founding materials (in
State) Co., Ltd, model NODALLOY 6RE；Silicon titanate innoculant is purchased from Fushi section founding materials (China) Co., Ltd, type
It number is INOCULIN 325, sulphur oxygen inovulant containing cerium is purchased from angstrom willing (carbon) company, model sulphur oxygen inovulant containing cerium.
Percentage in the present invention is mass percent.
Embodiment 1:
For -50 DEG C of iron casting of bullet train electric machine stand, the iron casting is by following weight percents
At being grouped as: carbon 3.6-3.85%, silicon 1.6-2.0%, manganese≤0.12%, phosphorus is less than 0.03%, nickel 0.75-0.82%, remaining
For iron and sulphur impurity.
Such as the casting method of above-mentioned -50 DEG C of the iron casting for bullet train electric machine stand, the specific steps are as follows:
(1) melting: stokehold sequentially adds the pig iron, steel scrap, silicon carbide, carburant and foundry returns, and smelting temperature rises to 1490
DEG C when be added nickel, 1500 DEG C of whens, take stokehold spectrum sample, adjust constituent according to stokehold spectrum sample, comply with composition content and want
It asks；1575 DEG C are continuously heating to, coverture is added, has a power failure and stands 2 minutes, scarfing cinder；The pig iron, steel scrap and foundry returns are molten iron raw material
Constituent, wherein the mass fraction of each constituent are as follows: the pig iron accounts for 60-80%, and steel scrap accounts for 15-25%, and foundry returns accounts for 5-
15%；
(2) it scalds packet: nodularization packet is scalded to 500-700 DEG C, it is dark red in packet；
(3) before hot nodularization packet is put into electric furnace, it is useless that nodulizer, packet bottom inovulant and briquetting nodularization: are sequentially added
Steel, compacting；Tapping nodularization first pours into 1570 DEG C in electric furnace of molten iron 2/3rds in nodularization packet, to nodularization after, then will
Remaining one third molten iron pours into nodularization packet in furnace, and is uniformly added into current-following inoculation silicon titanate innoculant, adds coverture,
After standing 1 minute, the dross of ladle liquid level is scratched clean, when temperature is 1470 DEG C, starts to be poured；
(4) be poured: after nodularization packet is moved to sandbox, packet mouth alignment cast gate is poured, and in casting, is added pregnant with flowing molten iron
Sulphur oxygen inovulant containing cerium is educated, and controls and is poured in 5 minutes, after being poured, sandbox is unpacked after keeping the temperature 10h；
(5) be heat-treated: casting is put into heat-treatment furnace and is heat-treated, with 70 DEG C per hour of liter by removal dead head
Warm speed rises to after 760 DEG C, heat preservation 2 hours to cool down per hour 50 DEG C, and kiln discharge is air-cooled after being down to 600 DEG C；
(6) casting for being air-cooled to room temperature ball blast: is carried out ball blast；
(7) it polishes: base being polished clean, at cast gate, riser and edge polishes smooth；
(8) quality inspection: quality inspection warehousing after passing.
Carbon >=3.3%, silicon 0.4-0.7%, manganese 0.05-0.1%, phosphorus≤0.02%, sulphur 0.015- in the pig iron in step (1)
0.02%, titanium 0.02-0.03%, remaining is iron；S < 0.015% in steel scrap, P < 0.015%, Mn < 0.018%, remaining is
Iron；The additional amount of silicon carbide is the 0.3-0.4% of molten iron total mass of raw material, and the additional amount of carburant is molten iron total mass of raw material
0.4%, the additional amount of nickel is the 0.75-0.82% of molten iron total mass of raw material, and the additional amount of coverture is molten iron total mass of raw material
0.2%-0.3%.
In step (1), carburant is electrode graphite carburant, 80% carbonization that silicon carbide is carbon containing 25%, siliceous 55%
Silicon, coverture include SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6%, also containing micro-
Secondary element, granularity 0.3-0.7mm.
In step (3), the additional amount of nodulizer is the 1.35-1.4% of molten iron total mass of raw material, wraps the addition of bottom inovulant
Amount is the 0.6% of molten iron total mass of raw material, and the additional amount of the silicon titanate innoculant of current-following inoculation is molten iron total mass of raw material
0.4%, the additional amount of briquetting steel scrap is the 1.3% of molten iron total mass of raw material, and the additional amount of coverture is molten iron total mass of raw material
0.01%.
In step (3), nodulizer includes Si40-50%, Mg5.0-5.5%, Ca1.5-2.5%, RE0.6-1.2%, Al
< 0.5% also contains microelement, granularity 5-25mm；Packet bottom inovulant includes Si60-67%, Al0.5-1.7%,
Ca0.4-2.0%, Ba7.0-11.0% also contain microelement, granularity 2-6mm；The silicon titanate innoculant of current-following inoculation includes
Si70-75%, Al0.5-1.5%, Ca1.0-2.0%, Ba2.0-3.0% also contain microelement, granularity 3-8mm；Briquetting
Steel scrap is identical as the steel scrap material in step (1), and coverture includes SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-
1.6%, CaO0.1-1.6% also contain microelement, granularity 0.3-0.7mm.
It is the 0.08% of molten iron total mass of raw material with the additional amount that flowing molten iron breeds sulphur oxygen inovulant containing cerium in step (4).
In step (4), breeding sulphur oxygen inovulant containing cerium with flowing molten iron includes Si70-76%, Ca0.75-1.25%, Ce1.5-
2.0%, Al0.75-1.25% also contain microelement, granularity 0.2-0.7mm.
Step (8) specifically: 1. detect apparent size；2. ontology auxiliary test block coupon is carried out -50 DEG C of cold punchings, and with 50
The notch of × 10 × 10mm examines impact value, and coupon is put into tensile testing machine and carries out mechanical performance test, tensile strength, surrender
Intensity, elongation percentage, hardness are cut metallographic phase sample at auxiliary coupon and are examined: matrix, ferrite, iron phosphide eutectic, carbide, nodularization
Rate, sphere diameter, ball number whole warehousing after passing wait delivering.
Embodiment 2:
For -50 DEG C of iron casting of bullet train electric machine stand, the iron casting is by following weight percents
At being grouped as: carbon 3.6%, silicon 1.6%, manganese 0.12%, phosphorus 0.029%, sulphur 0.0095%, nickel 0.75%, remaining is iron.
Such as the casting method of above-mentioned -50 DEG C of the iron casting for bullet train electric machine stand, the specific steps are as follows:
(1) melting: stokehold sequentially adds the pig iron, steel scrap, silicon carbide, carburant and foundry returns, and smelting temperature rises to 1490
DEG C when be added nickel, 1500 DEG C of whens, take stokehold spectrum sample, adjust constituent according to stokehold spectrum sample, comply with composition content and want
It asks；1575 DEG C are continuously heating to, coverture is added, has a power failure and stands 2 minutes, scarfing cinder；The pig iron, steel scrap and foundry returns are molten iron raw material
Constituent, wherein the mass fraction of each constituent are as follows: the pig iron accounts for 60%, and steel scrap accounts for 25%, and foundry returns accounts for 15%；
(2) it scalds packet: nodularization packet is scalded to 500 DEG C, it is dark red in packet；
(3) before hot nodularization packet is put into electric furnace, it is useless that nodulizer, packet bottom inovulant and briquetting nodularization: are sequentially added
Steel, compacting；Tapping nodularization first pours into 1570 DEG C in electric furnace of molten iron 2/3rds in nodularization packet, to nodularization after, then will
Remaining one third molten iron pours into nodularization packet in furnace, and is uniformly added into current-following inoculation silicon titanate innoculant, adds coverture,
After standing 1 minute, the dross of ladle liquid level is scratched clean, when temperature is 1470 DEG C, starts to be poured；
(4) be poured: after nodularization packet is moved to sandbox, packet mouth alignment cast gate is poured, and in casting, is added pregnant with flowing molten iron
Sulphur oxygen inovulant containing cerium is educated, and controls and is poured in 5 minutes, after being poured, sandbox is unpacked after keeping the temperature 10h；
(5) be heat-treated: casting is put into heat-treatment furnace and is heat-treated, with 70 DEG C per hour of liter by removal dead head
Warm speed rises to after 760 DEG C, heat preservation 2 hours to cool down per hour 50 DEG C, and kiln discharge is air-cooled after being down to 600 DEG C；
(6) casting for being air-cooled to room temperature ball blast: is carried out ball blast；
(7) it polishes: base being polished clean, at cast gate, riser and edge polishes smooth；
(8) quality inspection: quality inspection warehousing after passing.
Carbon >=3.3%, silicon 0.4-0.7%, manganese 0.05-0.1%, phosphorus≤0.02%, sulphur 0.015- in the pig iron in step (1)
0.02%, titanium 0.02-0.03%, remaining is iron；S < 0.015% in steel scrap, P < 0.015%, Mn < 0.018%, remaining is
Iron；The additional amount of silicon carbide is the 0.3% of molten iron total mass of raw material, and the additional amount of carburant is molten iron total mass of raw material
0.4%, the additional amount of nickel is the 0.75% of molten iron total mass of raw material, and the additional amount of coverture is molten iron total mass of raw material
0.2%%.
In step (1), carburant is electrode graphite carburant, 80% carbonization that silicon carbide is carbon containing 25%, siliceous 55%
Silicon, coverture include SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6%, also containing micro-
Secondary element.
In step (3), the additional amount of nodulizer is the 1.35% of molten iron total mass of raw material, and the additional amount of packet bottom inovulant is
The 0.6% of molten iron total mass of raw material, the additional amount of the silicon titanate innoculant of current-following inoculation are the 0.4% of molten iron total mass of raw material, pressure
The additional amount of block steel scrap is the 1.3% of molten iron total mass of raw material, and the additional amount of coverture is the 0.01% of molten iron total mass of raw material.
In step (3), nodulizer includes Si40-50%, Mg5.0-5.5%, Ca1.5-2.5%, RE0.6-1.2%, Al
< 0.5%, also contains microelement；Wrapping bottom inovulant includes Si60-67%, Al0.5-1.7%, Ca0.4-2.0%, Ba7.0-
11.0%, also contain microelement；The silicon titanate innoculant of current-following inoculation includes Si70-75%, Al0.5-1.5%, Ca1.0-
2.0%, Ba2.0-3.0% also contain microelement；Briquetting steel scrap is identical as the steel scrap material in step (1), in coverture
SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6% also contain microelement.
It is the 0.08% of molten iron total mass of raw material with the additional amount that flowing molten iron breeds sulphur oxygen inovulant containing cerium in step (4).
In step (4), breeding sulphur oxygen inovulant containing cerium with flowing molten iron includes Si70-76%, Ca0.75-1.25%, Ce1.5-
2.0%, Al0.75-1.25% also contain microelement.
Step (8) specifically: 1. detect apparent size；2. ontology auxiliary test block coupon is carried out -50 DEG C of cold punchings, and with 50
The notch of × 10 × 10mm examines impact value, and coupon is put into tensile testing machine and carries out mechanical performance test, tensile strength, surrender
Intensity, elongation percentage, hardness are cut metallographic phase sample at auxiliary coupon and are examined: matrix, ferrite, iron phosphide eutectic, carbide, nodularization
Rate, sphere diameter, ball number whole warehousing after passing wait delivering.Other are the same as embodiment 1.
The chemical composition data and nodularization packet temperature value of the iron casting of embodiment 3-12 are as shown in table 1, embodiment 3-12
Implementation data it is as shown in table 2, other are the same as embodiment 1.
The chemical composition data and nodularization packet temperature value of the iron casting of 1 embodiment 3-12 of table
The implementation data of 2 embodiment 3-12 of table
Wherein, the pig iron, steel scrap and foundry returns are the constituent of molten iron raw material, and silicon carbide, nickel, coverture and nodulizer are equal
For the mass percent on the basis of molten iron total mass of raw material.
Mechanical performance, matrix, metallographic and -50 DEG C of ballistic work tests of the low-temperature spheroidal iron casting of embodiment 2-12 preparation
Data are as shown in table 3.
The performance test data of the iron casting of 3 embodiment 2-12 of table preparation
Mainly gone out fastly by electro-smelting F.F., strict control fusion temperature≤1580 DEG C, tapping temperature≤1570 DEG C,
Strict control raw material low Mn, P, S, Ti, important is to solve the problems, such as electric furnace molten iron oxidation, and the phosphorus content for actually using silicon carbide is
25%, silicone content 55%, additional amount are the 0.3-0.4% of molten iron total mass of raw material.- 50 DEG C and -40 DEG C of difference is not only wanted
Phosphorus content is controlled, also to control silicone content lower than 1.9%, if silicon is lower than 1.6%, mechanical performance is not achieved.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without depart from that overall concept of the invention, several changes and improvements can also be made, these also should be considered as of the invention
Protection scope.
Claims (8)
1. the casting method of -50 DEG C of the iron casting for bullet train electric machine stand, it is characterised in that: specific steps are such as
Under:
(1) melting: stokehold sequentially adds the pig iron, steel scrap, silicon carbide, carburant and foundry returns, when smelting temperature rises to 1490 DEG C
Nickel is added, 1500 DEG C of whens take stokehold spectrum sample, adjust constituent according to stokehold spectrum sample, comply with composition content requirement；
1575 DEG C are continuously heating to, coverture is added, has a power failure and stands 2 minutes, scarfing cinder；The pig iron, steel scrap and foundry returns are molten iron raw material
Constituent, wherein the mass fraction of each constituent are as follows: the pig iron accounts for 60-80%, and steel scrap accounts for 15-25%, and foundry returns accounts for 5-15%；
(2) it scalds packet: nodularization packet is scalded to 500-700 DEG C, it is dark red in packet；
(3) before hot nodularization packet is put into electric furnace, nodulizer, packet bottom inovulant and briquetting steel scrap, pressure nodularization: are sequentially added
It is real；Tapping nodularization first pours into 1570 DEG C in electric furnace of molten iron 2/3rds in nodularization packet, to nodularization after, then will be in furnace
Remaining one third molten iron pours into nodularization packet, and is uniformly added into current-following inoculation silicon titanate innoculant, adds coverture, stands
After 1 minute, the dross of ladle liquid level is scratched clean, when temperature is 1470 DEG C, starts to be poured；
(4) be poured: after nodularization packet is moved to sandbox, packet mouth alignment cast gate is poured, and in casting, is added and is bred sulphur with flowing molten iron
Oxygen inovulant containing cerium, and control and be poured in 5 minutes, after being poured, sandbox is unpacked after keeping the temperature 10h；
(5) be heat-treated: casting is put into heat-treatment furnace and is heat-treated by removal dead head, with 70 DEG C per hour of heating speed
Degree rises to after 760 DEG C, heat preservation 2 hours to cool down per hour 50 DEG C, and kiln discharge is air-cooled after being down to 600 DEG C；
(6) casting for being air-cooled to room temperature ball blast: is carried out ball blast；
(7) it polishes: base being polished clean, at cast gate, riser and edge polishes smooth；
(8) quality inspection: quality inspection warehousing after passing；
The iron casting is by following weight percents at being grouped as: carbon 3.6-3.85%, silicon 1.6-2.0%, manganese≤0.12%,
Phosphorus < 0.03%, nickel 0.75-0.82%, remaining is iron and sulphur impurity.
2. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: carbon >=3.3%, silicon 0.4-0.7%, manganese 0.05-0.1%, phosphorus≤0.02%, sulphur 0.015- in the pig iron in step (1)
0.02%, titanium 0.02-0.03%, remaining is iron；S < 0.015% in steel scrap, P < 0.015%, Mn < 0.018%, remaining is iron；Carbon
The additional amount of SiClx is the 0.3-0.4% of molten iron total mass of raw material, and the additional amount of carburant is the 0.4% of molten iron total mass of raw material,
The additional amount of nickel is the 0.75-0.82% of molten iron total mass of raw material, and the additional amount of coverture is the 0.2%- of molten iron total mass of raw material
0.3%。
3. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: in step (1), carburant is electrode graphite carburant, and 80% silicon carbide that silicon carbide is carbon containing 25%, siliceous 55% covers
Lid agent includes SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6%.
4. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: in step (3), the additional amount of nodulizer is the 1.35-1.4% of molten iron total mass of raw material, wraps the additional amount of bottom inovulant
It is the 0.6% of molten iron total mass of raw material, the additional amount of the silicon titanate innoculant of current-following inoculation is the 0.4% of molten iron total mass of raw material, pressure
The additional amount of block steel scrap is the 1.3% of molten iron total mass of raw material, and the additional amount of coverture is the 0.01% of molten iron total mass of raw material.
5. the casting method of -50 DEG C of the iron casting according to claim 2 for bullet train electric machine stand, special
Sign is: in step (3), nodulizer includes Si40-50%, Mg5.0-5.5%, Ca1.5-2.5%, RE0.6-1.2%, Al <
0.5%；Wrapping bottom inovulant includes Si60-67%, Al0.5-1.7%, Ca0.4-2.0%, Ba7.0-11.0%；The silicon barium of current-following inoculation
Inovulant includes Si70-75%, Al0.5-1.5%, Ca1.0-2.0%, Ba2.0-3.0%；Steel scrap in briquetting steel scrap and step (1)
Material is identical, and coverture includes SiO267.5-78%, Al2O310-17.6%, Fe2O30.3-1.6%, CaO0.1-1.6%.
6. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: being the 0.08% of molten iron total mass of raw material with the additional amount that flowing molten iron breeds sulphur oxygen inovulant containing cerium in step (4).
7. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: in step (4), breeding sulphur oxygen inovulant containing cerium with flowing molten iron includes Si70-76%, Ca0.75-1.25%, Ce1.5-
2.0%, Al0.75-1.25%.
8. the casting method of -50 DEG C of the iron casting according to claim 1 for bullet train electric machine stand, special
Sign is: step (8) specifically:Detect apparent size；Ontology auxiliary test block coupon is carried out -50 DEG C of cold punchings, and with 50
The notch of × 10 × 10mm examines impact value, and coupon is put into tensile testing machine and carries out mechanical performance test, tensile strength, surrender
Intensity, elongation percentage, hardness are cut metallographic phase sample at auxiliary coupon and are examined: matrix, ferrite, iron phosphide eutectic, carbide, nodularization
Rate, sphere diameter, ball number whole warehousing after passing wait delivering.
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| CN114657307B (en) * | 2022-04-18 | 2023-08-22 | 宜宾普什联动科技有限公司 | Production process of ductile iron with low-temperature impact toughness at-50 DEG C |
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| CN102634647A (en) * | 2012-05-11 | 2012-08-15 | 四川城际轨道交通材料有限责任公司 | Low-temperature (minus 60 DEG C) toughness improvement method of nodular cast iron |
| US9580777B1 (en) * | 2016-02-08 | 2017-02-28 | Roman Radon | Hypereutectic white iron alloys comprising chromium, boron and nitrogen and articles made therefrom |
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| CN102634647A (en) * | 2012-05-11 | 2012-08-15 | 四川城际轨道交通材料有限责任公司 | Low-temperature (minus 60 DEG C) toughness improvement method of nodular cast iron |
| US9580777B1 (en) * | 2016-02-08 | 2017-02-28 | Roman Radon | Hypereutectic white iron alloys comprising chromium, boron and nitrogen and articles made therefrom |
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