CN105483513A - High-hardness wear-resisting grey cast iron diesel engine cylinder material and preparation method thereof - Google Patents

High-hardness wear-resisting grey cast iron diesel engine cylinder material and preparation method thereof Download PDF

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Publication number
CN105483513A
CN105483513A CN201510891597.8A CN201510891597A CN105483513A CN 105483513 A CN105483513 A CN 105483513A CN 201510891597 A CN201510891597 A CN 201510891597A CN 105483513 A CN105483513 A CN 105483513A
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CN
China
Prior art keywords
insulation
cast iron
cylinder material
molten iron
resisting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510891597.8A
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Chinese (zh)
Inventor
周道虎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FANCHANG COUNTY HENGXIN AUTO PARTS Co Ltd
Original Assignee
FANCHANG COUNTY HENGXIN AUTO PARTS Co Ltd
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Publication date
Application filed by FANCHANG COUNTY HENGXIN AUTO PARTS Co Ltd filed Critical FANCHANG COUNTY HENGXIN AUTO PARTS Co Ltd
Priority to CN201510891597.8A priority Critical patent/CN105483513A/en
Publication of CN105483513A publication Critical patent/CN105483513A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • C21C1/08—Manufacture of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0436—Iron
    • F05C2201/0439—Cast iron

Abstract

The invention discloses a high-hardness wear-resisting grey cast iron diesel engine cylinder material and a preparation method thereof. The high-hardness wear-resisting grey cast iron diesel engine cylinder material consists of the following components in percentage by mass: 2.4-2.8% of C, 1.6-2.2% of Si, 0.8-1.4% of Mn, 0.5-0.9% of Cu, 0.4-0.7% of W, 0.3-0.5% of Nb, 0.25-0.45% of Zr, 0.05-0.1% of B, 0.04-0.08% of Ce, 0.03-0.06% of Er, 0.6-1.2% of P, 0.05-0.15% of S and the balance of Fe. By adding proper alloy elements such as W, Nb, Zr and the like, the toughness of the grey cast iron is increased, so that the grey cast iron has higher hardness and wear resistance; the content of P is increased, so that the wear resistance of the grey cast iron is improved; and furthermore, certain element B is added, so that segregation is distributed in the form of a mesh at a grain boundary, and the hardness and the wear resistance of the grey cast iron are higher.

Description

A kind of high hardness wear-resisting graphitic cast iron diesel motor cylinder material and preparation method thereof
Technical field
The present invention relates to a kind of cast iron materials, be specifically related to a kind of high hardness wear-resisting graphitic cast iron diesel motor cylinder material and preparation method thereof.
Background technology
Diesel motor is made up of cylinder body and cylinder cap two parts, be inter-connected via a bolt joint, wherein cylinder body is one of most important part in diesel motor and even automobile, is fundamental parts and the skeleton of diesel motor, fundamental parts when being simultaneously again diesel motor general assembly.The accurate location when effect of cylinder body is the moving parts work such as supporting and guarantee piston, connecting rod, bent axle; Ensure the ventilation of diesel motor, Cooling and Lubricator; The installation of various subsystem, parts and diesel motor is provided.The processing quality of diesel motor cylinder material directly affects the quality of diesel motor, and then has influence on the quality of Integral automobile, and therefore the performance of diesel motor cylinder is subject to the attention of domestic and international automobile production enterprise for a long time always.The working conditions of cylinder body determines cylinder body and must have high strength, high rigidity, high rigidity, high-wearing feature and good thermal diffusivity and machinability, will have good stopping property, anti-leakage, damping etc. simultaneously.In recent years along with the fast development of automotive industry, more and more higher to the performance requriements of diesel motor cylinder material.And the graphitic cast iron diesel motor cylinder material that China produces at present also exists the shortcoming worn no resistance, cannot meet the need of market.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of high hardness wear-resisting graphitic cast iron diesel motor cylinder material and preparation method thereof is provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of high hardness wear-resisting graphitic cast iron diesel motor cylinder material, its mass percent composition is: C2.4-2.8, Si1.6-2.2, Mn0.8-1.4, Cu0.5-0.9, W0.4-0.7, Nb0.3-0.5, Zr0.25-0.45, B0.05-0.1, Ce0.04-0.08, Er0.03-0.06, P0.6-1.2, S0.05-0.15, surplus are Fe.
A preparation method for high hardness wear-resisting graphitic cast iron diesel motor cylinder material, comprises the following steps:
(1) medium-frequency induction furnace is adopted to carry out melting, first steel scrap, the pig iron and foundry returns is added at furnace bottom, ferrosilicon, ferromanganese and ferro-boron is added after load melting, add petroleum coke powder when molten iron temperature reaches 1440-1480 DEG C and carry out carburetting, then other iron alloy is added to adjust molten iron chemical composition, alloying element cu adds with the mode of electrolytic copper 4-6min before coming out of the stove, alloy element Nb is placed in casting ladle in the mode of pure niobium, leave standstill insulation 10-15min when molten iron temperature reaches 1520-1560 DEG C, then come out of the stove;
(2) select granularity to be the surface that the silico-calcium nucleating agent of 5-10mm joins molten iron in casting ladle, at 1460-1490 DEG C, agitation as appropriate carries out wrapping interior inoculation;
(3) in casting ladle, add granularity is that the rare earth ferrosilicon nucleating agent of 4-8mm carries out late inoculation process at 1430-1460 DEG C;
(4) be poured in clay sand mold by the molten iron after inoculation, teeming temperature is not less than 1400 DEG C; Then heat-treat shaping foundry goods: be first heated to 840-880 DEG C, insulation 3-5h, water-cooled, to 380-420 DEG C, is incubated 2-3h; Then be heated to 920-960 DEG C, insulation 4-6h, oil cooling, to 450-500 DEG C, be incubated 3-4h, then mist is chilled to 270-330 DEG C, insulation 1-2h; Finally be heated to 410-440 DEG C, insulation 2-3h, reheats to 760-820 DEG C, and insulation 2-4h is air-cooled to 360-390 DEG C, insulation 1-2h, then air cooling is to normal temperature.
Beneficial effect of the present invention:
The present invention adds the alloying elements such as appropriate W, Nb, Zr, compound Hard Inclusion can be formed with C, and crystal grain thinning, increase the toughness of graphitic cast iron, and make it have higher hardness and wear resistance, invention increases the content of P, make P can form the hard skeleton of various Fe3P eutectic in main body, thus improve the wear resistance of graphitic cast iron, the present invention also added certain B element, form phosphorus boron-carbide, make to be segregated in crystal boundary net distribution, graphitic cast iron hardness and wear resistance higher.
Specific embodiment mode
Embodiment
A kind of high hardness wear-resisting graphitic cast iron diesel motor cylinder material, its mass percent composition is: C2.4-2.8, Si1.6-2.2, Mn0.8-1.4, Cu0.5-0.9, W0.4-0.7, Nb0.3-0.5, Zr0.25-0.45, B0.05-0.1, Ce0.04-0.08, Er0.03-0.06, P0.6-1.2, S0.05-0.15, surplus are Fe.
A preparation method for high hardness wear-resisting graphitic cast iron diesel motor cylinder material, comprises the following steps:
(1) medium-frequency induction furnace is adopted to carry out melting, first steel scrap, the pig iron and foundry returns is added at furnace bottom, ferrosilicon, ferromanganese and ferro-boron is added after load melting, add petroleum coke powder when molten iron temperature reaches 1460 DEG C and carry out carburetting, then add other iron alloy to adjust molten iron chemical composition, alloying element cu adds with the mode of electrolytic copper 5min before coming out of the stove, and alloy element Nb is placed in casting ladle in the mode of pure niobium, leave standstill insulation 10min when molten iron temperature reaches 1540 DEG C, then come out of the stove;
(2) select granularity to be the surface that the silico-calcium nucleating agent of 8mm joins molten iron in casting ladle, at 1470 DEG C, agitation as appropriate carries out wrapping interior inoculation;
(3) in casting ladle, add granularity is that the rare earth ferrosilicon nucleating agent of 6mm carries out late inoculation process at 1430-1460 DEG C;
(4) be poured in clay sand mold by the molten iron after inoculation, teeming temperature is not less than 1400 DEG C; Then shaping foundry goods is heat-treated: be first heated to 860 DEG C, insulation 4h, water-cooled to 410 DEG C, insulation 2.5h; Then be heated to 940 DEG C, insulation 5h, oil cooling to 470 DEG C, insulation 3h, then mist is chilled to 290 DEG C, insulation 1h; Finally be heated to 420 DEG C, insulation 3h, reheats to 780 DEG C, and insulation 3h is air-cooled to 380 DEG C, insulation 1.5h, then air cooling is to normal temperature.
Through inspection, chemical composition is: C2.62%, Si1.98%, Mn1.14%, Cu0.75%, W0.68%, Nb0.43%, Zr0.39%, B0.078%, Ce0.066%, Er0.045%, P1.08%, S0.084%, surplus are Fe.Its mechanical property is: tensile strength 326Mpa, hardness 292HB.

Claims (2)

1. a high hardness wear-resisting graphitic cast iron diesel motor cylinder material, it is characterized in that, its mass percent composition is: C2.4-2.8, Si1.6-2.2, Mn0.8-1.4, Cu0.5-0.9, W0.4-0.7, Nb0.3-0.5, Zr0.25-0.45, B0.05-0.1, Ce0.04-0.08, Er0.03-0.06, P0.6-1.2, S0.05-0.15, surplus are Fe.
2. the preparation method of high hardness wear-resisting graphitic cast iron diesel motor cylinder material according to claim 1, is characterized in that, comprise the following steps:
(1) medium-frequency induction furnace is adopted to carry out melting, first steel scrap, the pig iron and foundry returns is added at furnace bottom, ferrosilicon, ferromanganese and ferro-boron is added after load melting, add petroleum coke powder when molten iron temperature reaches 1440-1480 DEG C and carry out carburetting, then other iron alloy is added to adjust molten iron chemical composition, alloying element cu adds with the mode of electrolytic copper 4-6min before coming out of the stove, alloy element Nb is placed in casting ladle in the mode of pure niobium, leave standstill insulation 10-15min when molten iron temperature reaches 1520-1560 DEG C, then come out of the stove;
(2) select granularity to be the surface that the silico-calcium nucleating agent of 5-10mm joins molten iron in casting ladle, at 1460-1490 DEG C, agitation as appropriate carries out wrapping interior inoculation;
(3) in casting ladle, add granularity is that the rare earth ferrosilicon nucleating agent of 4-8mm carries out late inoculation process at 1430-1460 DEG C;
(4) be poured in clay sand mold by the molten iron after inoculation, teeming temperature is not less than 1400 DEG C; Then heat-treat shaping foundry goods: be first heated to 840-880 DEG C, insulation 3-5h, water-cooled, to 380-420 DEG C, is incubated 2-3h; Then be heated to 920-960 DEG C, insulation 4-6h, oil cooling, to 450-500 DEG C, be incubated 3-4h, then mist is chilled to 270-330 DEG C, insulation 1-2h; Finally be heated to 410-440 DEG C, insulation 2-3h, reheats to 760-820 DEG C, and insulation 2-4h is air-cooled to 360-390 DEG C, insulation 1-2h, then air cooling is to normal temperature.
CN201510891597.8A 2015-12-08 2015-12-08 High-hardness wear-resisting grey cast iron diesel engine cylinder material and preparation method thereof Pending CN105483513A (en)

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Application Number Priority Date Filing Date Title
CN201510891597.8A CN105483513A (en) 2015-12-08 2015-12-08 High-hardness wear-resisting grey cast iron diesel engine cylinder material and preparation method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106435344A (en) * 2016-10-24 2017-02-22 黄林 Motor casing casting material
CN106521308A (en) * 2016-12-09 2017-03-22 大连锦航新能源设备有限公司 Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof
CN107365939A (en) * 2017-08-28 2017-11-21 广东荻赛尔机械铸造股份有限公司 Engine is cylinder iron and preparation method thereof
CN108220761A (en) * 2018-01-11 2018-06-29 芜湖市金贸流体科技股份有限公司 A kind of nanometer goes bad wear-resisting gray cast iron and casting method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534398A (en) * 2012-01-06 2012-07-04 北京工业大学 Ferroboron-containing alloy wear-resistant material and preparation method thereof
CN103074539A (en) * 2013-01-07 2013-05-01 鞍钢重型机械有限责任公司 Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof
CN103556037A (en) * 2013-10-30 2014-02-05 青岛良力精铸有限公司 Method for preparing nodular cast iron for engine dry cylinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534398A (en) * 2012-01-06 2012-07-04 北京工业大学 Ferroboron-containing alloy wear-resistant material and preparation method thereof
CN103074539A (en) * 2013-01-07 2013-05-01 鞍钢重型机械有限责任公司 Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof
CN103556037A (en) * 2013-10-30 2014-02-05 青岛良力精铸有限公司 Method for preparing nodular cast iron for engine dry cylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106435344A (en) * 2016-10-24 2017-02-22 黄林 Motor casing casting material
CN106521308A (en) * 2016-12-09 2017-03-22 大连锦航新能源设备有限公司 Bottom ring material DPR-D5 of piston rings of marine diesel engine and casting method thereof
CN107365939A (en) * 2017-08-28 2017-11-21 广东荻赛尔机械铸造股份有限公司 Engine is cylinder iron and preparation method thereof
CN107365939B (en) * 2017-08-28 2019-08-02 广东荻赛尔机械铸造股份有限公司 Engine is cylinder iron and preparation method thereof
CN108220761A (en) * 2018-01-11 2018-06-29 芜湖市金贸流体科技股份有限公司 A kind of nanometer goes bad wear-resisting gray cast iron and casting method

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Application publication date: 20160413