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CN104451359A - Ultralow-temperature high-toughness special nodular cast iron metal material and preparation method thereof - Google Patents

Ultralow-temperature high-toughness special nodular cast iron metal material and preparation method thereof Download PDF

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Publication number
CN104451359A
CN104451359A CN201410698201.3A CN201410698201A CN104451359A CN 104451359 A CN104451359 A CN 104451359A CN 201410698201 A CN201410698201 A CN 201410698201A CN 104451359 A CN104451359 A CN 104451359A
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China
Prior art keywords
ultralow
cast iron
parts
temperature high
iron
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Pending
Application number
CN201410698201.3A
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Chinese (zh)
Inventor
周仕勇
李兴华
赵桂菊
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SHANDONG YUANTONG MACHINERY CO Ltd
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SHANDONG YUANTONG MACHINERY CO Ltd
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Priority to CN201410698201.3A priority Critical patent/CN104451359A/en
Publication of CN104451359A publication Critical patent/CN104451359A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/04Cast-iron alloys containing spheroidal graphite
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/08Making cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses an ultralow-temperature high-toughness special nodular cast iron metal material and a preparation method thereof. The ultralow-temperature high-toughness special nodular cast iron metal material comprises the following raw materials in parts by weight: 92-95 parts of pig iron, 5-8 parts of scrap steel, 1-2 parts of silicon iron, 2-3 parts of ferromanganese, 0.5-1 part of bismuth iron, 1.6-1.8 parts of a nodulizing agent and 0.5-0.8 part of an inoculant. The ultralow-temperature high-toughness special nodular cast iron metal material is prepared by smelting the pig iron, the scrap steel, the silicon iron, the ferromanganese, the bismuth iron and the inoculant in an electric furnace, performing metamorphic inoculation before furnace, casting forming and cooling. The ultralow-temperature high-toughness special nodular cast iron metal material has good structural performance, casting forming performance and machinability, can be applicable to workplaces with high requirements on high toughness, high strength, high wear resistance, cold resistance, corrosion resistance, shock absorption and safety performance, can be applied to high-speed trains, a wind power industry, vehicles, petroleum, a petrochemical industry and other industries, has relatively cheap raw materials, and has a very high practical value, a very high promotional significance and a wide market prospect.

Description

Extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness and preparation method thereof
Technical field
The invention belongs to field of new, be specifically related to extraordinary spheroidal graphite cast iron metallic substance of a kind of ultralow-temperature high-toughness and preparation method thereof.
Background technology
Along with developing rapidly of industry both at home and abroad, the performance requriements of the ferrite ductile cast iron in spheroidal graphite cast iron with low-temperature flexibility is increased day by day, not only the tensile strength under its normal temperature, unit elongation, yield strength are had higher requirements, more requirement be it is also proposed to the toughness under low temperature, the low-temperature flexibility spheroidal graphite cast iron of original trade mark can not be met the demands, on the accessories such as bullet train, wind-power electricity generation, vehicle, oil and petrochemical equipment that new requirement outstanding behaviours develops very fast in China.Such as: along with China's track traffic is fast-developing, speed per hour more than the EMUs of 200Km/h and 300Km/h to the increase in demand of ferritic spheroidal graphite cast iron foundry goods, because speed is fast, stressed complexity, some component are naked to be exposed on the external, and also has wind power casting due to Working environment special (high-altitude, outdoor), maintenance and difficulty thereof, cost is very high, requires also more strict to the mechanical property of G. Iron Castings, low temperature impact properties.
Because the low-temperature impact toughness of common spheroidal graphite cast iron is lower, in the environment of cold, easily there is brittle rupture, the performance requriements of the equipment part worked in low temperature environment cannot be met, be not suitable for producing the equipment part such as bullet train, wind-powered electricity generation.Therefore, when producing bullet train, wind-powered electricity generation magnesium iron accessory, the Low-temperature high-tenacity nodular cast iron with higher production technology content must be selected, ensure the use safety of accessory with this.Therefore, the research and development of the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness and application, have very important significance to the development of bullet train, wind-powered electricity generation industry, vehicle, oil and petrochemical industry.
Summary of the invention
The object of this invention is to provide extraordinary spheroidal graphite cast iron metallic substance of a kind of ultralow-temperature high-toughness and preparation method thereof, good structure properties, casting forming function, machinability can be met, can meet again high tenacity, high strength, high abrasion, winter hardiness, solidity to corrosion, damping property, safety performance require high workplace, cost is low.
The extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness of the present invention, raw-material weight proportioning is the pig iron 92 ~ 95 parts, steel scrap 5 ~ 8 parts, ferrosilicon 1 ~ 2 part, 2 ~ 3 parts, ferromanganese, bismuth iron 0.5 ~ 1 part, nodulizing agent 1.6 ~ 1.8 parts, nucleating agent 0.5 ~ 0.8 part.
Nodulizing agent is rare earth magnesium ferrosilicon alloy.The preferred QRMg6RE2 rare earth magnesium ferrosilicon alloy of rare earth magnesium ferrosilicon alloy.
The pig iron uses the Q10# pig iron.The Q10# pig iron is the pig iron of low silicon, low-phosphorous, low-sulfur.
Steel scrap adopts rustless one-level steel scrap.
Ferrosilicon adopts 75# ferrosilicon.Silicon can reduce crystallisation process and spoken parts in traditional operas is inclined, refinement graphite, improves the roundness of graphite pebbles.
Ferromanganese adopts 65# ferromanganese.
Bismuth iron adopts the bismuth iron of bismuth-containing 99.99%.The effect of Bi is the nodulizing grade and the size rank that improve graphite pebbles, promotes ferritic formation, improves the low-temperature impact resistance of spheroidal graphite cast iron further.
Nucleating agent adopts silicon titanate innoculant.
The preparation method of the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness:
Be electrosmelting of intermediate frequency by the pig iron, steel scrap, ferrosilicon, ferromanganese, bismuth iron, nodulizing agent and nucleating agent, go bad through stokehold inoculation, then obtain product through casting cooling.
The stokehold inoculation that goes bad is by adding nodulizing agent, nucleating agent and adopting late inoculation method to obtain, at 1350 DEG C ~ 1380 DEG C, the liquid form mixt after nodularization is cast in casting mold, and make it in casting mold, progressively cool to less than 500 DEG C, clear out from casting mold, receive the foundry goods of this material cast.
The present invention is on the basis of common ferrite ductile cast iron, adds the Bi of 0.005%, and rare earth collocation, can effective refinement graphite, and raising Oxygen potential and number of graphite ball, improve nodulizing grade, prevent or reduce the formation of abnormal graphite.By adding the Bi of 0.005%, promote ferritic formation, silicon can reduce crystallisation process and chilling tendency, can also refinement graphite, improve the roundness of graphite pebbles, but silicon height easily forms abnormal graphite, improve low temperature brittleness, therefore whole silicon controls at 1.8-2.0%, and carries out Metamorphism treatment with the rare earth magnesium nodularizer of low rare earth and obtain a kind of extraordinary spheroidal graphite cast iron being suitable for cold environment.The effect of Bi is the nodulizing grade and the size rank that improve graphite pebbles, promotes ferritic formation, further increases the low-temperature impact resistance of spheroidal graphite cast iron.
The chemical composition of the extraordinary spheroidal graphite cast iron metallic substance of described ultralow-temperature high-toughness is: C:3.5-3.8%, Si:1.8% ~ 2.0%, Mn:< 0.2%, S :≤0.02%, P :≤0.03%, Bi:0.0049 ~ 0.0051%, Mg:0.04-0.06%, Re:0.02-0.03%.
The mechanical property of the extraordinary spheroidal graphite cast iron metallic substance of described ultralow-temperature high-toughness:
1, tensile strength >=400MPa, unit elongation > 22%, hardness HB130-175 ,-40 DEG C are impacted mean value and are greater than 17.3J, and-50 DEG C are impacted mean value and are greater than 14J.
2, matrix: ferrite (> 98%)+a small amount of perlite+a small amount of free cementite.
Compared with prior art, the present invention has following beneficial effect:
(1) the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness of the present invention, good structure properties, casting forming function, machinability can be met, high tenacity can be met again, high strength, high abrasion, winter hardiness, solidity to corrosion, damping property, safety performance require high workplace.
(2) wheel hub, gear housing, base, bearing support etc. of wind power equipment can be produced, bullet train turn to axle box, the automobile that extremely frigid zones travels and throughout the year traveling some nodular iron castings on the cargo ship of cold district, oil and petrochemical equipment accessory etc.
(3) use the bismuth iron of relative moderate to instead of ferronickel, the production cost adding bismuth just adds 1/8 of nickel, significantly reduces production cost, has very high practical value and dissemination, wide market.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
The raw material quality proportioning of molten alloy cast iron is: the 10# pig iron 95 parts, rustless one-level steel scrap 5 parts, 75# ferrosilicon 2 parts, 3 parts, 65# ferromanganese, the bismuth iron of bismuth-containing 99.99 parts 1 part, employing medium-frequency induction furnace melts, after temperature reaches 1530 DEG C, add silicon titanate innoculant 0.8 part, QRMg6RE2 rare earth magnesium ferrosilicon alloy 1.6 parts, rottenly through stokehold breed spheroidizing and form, at 1350 DEG C ~ 1380 DEG C, the liquid form mixt after nodularization is cast in wheel hub casting mold, and make it in casting mold, progressively cool to less than 500 DEG C, clear out from casting mold, obtain wheel hub.
The piece weight 37.5kg of wheel hub, average wall thickness 20mm, wheel hub foundry processing is furan resin self curing sand moulding process.
Through inspection, the chemical composition of wheel hub is: C:3.55%, Si:1.95%, Mn:0.186%, P:0.025%, S:0.02%, Bi:0.0051%, Mg:0.055%, Re:0.024%.
Tensile strength 461MPa, unit elongation 23.6%, hardness HB155 ,-40 DEG C are impacted mean value 17.6J, and-50 DEG C are impacted mean value 14.3J.
After processing, the psychro-environment safety performance being applied to wind-powered electricity generation industry is stablized.
Embodiment 2
The raw-material weight proportioning of molten alloy cast iron is: the 10# pig iron 92 parts, rustless one-level steel scrap 8 parts, 75# ferrosilicon 1 part, 2 parts, 65# ferromanganese, the bismuth iron of bismuth-containing 99.99 parts 0.5 part, employing medium-frequency induction furnace melts, and temperature detects chemical composition by spectrograph after reaching 1530 DEG C, add silicon titanate innoculant 0.5 part, QRMg6RE2 rare earth magnesium ferrosilicon alloy 1.8 parts, rottenly through stokehold breeds spheroidizing and forms, and is cast in turn in the sand mold die cavity of axle box to obtain turning to axle box.
Turn to the piece weight 65.5kg of axle box, average wall thickness 22mm, turn to the foundry processing of axle box to be furan resin self curing sand moulding process.
Through inspection, the chemical composition of axle box is turned to be: C:3.78%, Si:1.82%, Mn:0.178%, P:0.023%, S:0.016%, Bi:0.0049%, Mg:0.052%, Re:0.022%.
Tensile strength 448MPa, unit elongation 27.9%, hardness HB151 ,-40 DEG C are impacted mean value 17.8J, and-50 DEG C are impacted mean value 14.6J.
After processing, be applied to bullet train, safety performance is stablized.
Embodiment 3
The raw-material weight proportioning of molten alloy cast iron is: the 10# pig iron 94 parts, rustless one-level steel scrap 6 parts, 75# ferrosilicon 1.5 parts, 2.5 parts, 65# ferromanganese, the bismuth iron of bismuth-containing 99.99 parts 0.8 part, employing medium-frequency induction furnace melts, and temperature detects chemical composition by spectrograph after reaching 1530 DEG C, add silicon titanate innoculant 0.7 part, QRMg6RE2 rare earth magnesium ferrosilicon alloy 1.7 parts, rottenly through stokehold breeds spheroidizing and forms, and obtains wheel hub in the sand mold die cavity being cast in wheel hub.
The piece weight 37.5kg of wheel hub, average wall thickness 20mm, wheel hub foundry processing is furan resin self curing sand moulding process.
Through inspection, the chemical composition of wheel hub is: C:3.69%, Si:1.91%, Mn:0.176%, P:0.022%, S:0.018%, Bi:0.0050%, Mg:0.053%, Re:0.026%.
Tensile strength 461MPa, unit elongation 23.6%, hardness HB155 ,-40 DEG C are impacted mean value 17.6J, and-50 DEG C are impacted mean value 14.3J.
After processing, the psychro-environment safety performance being applied to wind-powered electricity generation industry is stablized.

Claims (9)

1. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness, it is characterized in that, described raw-material weight proportioning is the pig iron 92 ~ 95 parts, steel scrap 5 ~ 8 parts, ferrosilicon 1 ~ 2 part, 2 ~ 3 parts, ferromanganese, bismuth iron 0.5 ~ 1 part, nodulizing agent 1.6 ~ 1.8 parts, nucleating agent 0.5 ~ 0.8 part.
2. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, nodulizing agent is rare earth magnesium ferrosilicon alloy.
3. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, the described pig iron is the Q10# pig iron.
4. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, described steel scrap is rustless one-level steel scrap.
5. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, described ferrosilicon is 75# ferrosilicon.
6. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, described ferromanganese is 65# ferromanganese.
7. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, described bismuth iron is the bismuth iron of bismuth-containing 99.99%.
8. the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, described nucleating agent is silicon titanate innoculant.
9. the preparation method of the extraordinary spheroidal graphite cast iron metallic substance of ultralow-temperature high-toughness according to claim 1, it is characterized in that, be electrosmelting of intermediate frequency by the pig iron, steel scrap, ferrosilicon, ferromanganese, bismuth iron, nodulizing agent and nucleating agent, go bad through stokehold inoculation, then obtain product through casting cooling.
CN201410698201.3A 2014-11-26 2014-11-26 Ultralow-temperature high-toughness special nodular cast iron metal material and preparation method thereof Pending CN104451359A (en)

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Publication number Priority date Publication date Assignee Title
CN105256220A (en) * 2015-09-22 2016-01-20 山东汇丰铸造科技股份有限公司 Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof
CN106498267A (en) * 2016-12-30 2017-03-15 山东省源通机械股份有限公司 Spheroidal graphite cast-iron metal material and preparation method thereof
CN111809104A (en) * 2020-07-09 2020-10-23 吕刚 Nodular cast iron material and preparation method thereof
CN112176243A (en) * 2020-10-30 2021-01-05 山东省源通机械股份有限公司 Nodular cast iron material for producing explosion-proof motor casting and preparation method thereof

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105256220A (en) * 2015-09-22 2016-01-20 山东汇丰铸造科技股份有限公司 Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof
CN106498267A (en) * 2016-12-30 2017-03-15 山东省源通机械股份有限公司 Spheroidal graphite cast-iron metal material and preparation method thereof
CN111809104A (en) * 2020-07-09 2020-10-23 吕刚 Nodular cast iron material and preparation method thereof
CN112176243A (en) * 2020-10-30 2021-01-05 山东省源通机械股份有限公司 Nodular cast iron material for producing explosion-proof motor casting and preparation method thereof
CN114836679A (en) * 2020-10-30 2022-08-02 山东省源通机械股份有限公司 Nodular cast iron material and preparation method and application thereof

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