CN105483514A - Anti-impact vermicular graphite cast iron material for diesel engine cylinder body and preparation method for anti-impact vermicular graphite cast iron material - Google Patents
Anti-impact vermicular graphite cast iron material for diesel engine cylinder body and preparation method for anti-impact vermicular graphite cast iron material Download PDFInfo
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- CN105483514A CN105483514A CN201510891628.XA CN201510891628A CN105483514A CN 105483514 A CN105483514 A CN 105483514A CN 201510891628 A CN201510891628 A CN 201510891628A CN 105483514 A CN105483514 A CN 105483514A
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- insulation
- vermicular graphite
- cast iron
- iron material
- impact
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Classifications
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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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- 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
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- 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
-
- 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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- 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
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- 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 an anti-impact vermicular graphite cast iron material for a diesel engine cylinder body and a preparation method for the anti-impact vermicular graphite cast iron material. The anti-impact vermicular graphite cast iron material for the diesel engine cylinder body consists of the following components in percentage by mass: 3.6-3.9% of C, 2.3-2.7% of Si, 0.6-0.8% of Mn, 0.3-0.45% of Nb, 0.2-0.3% of Be, 0.1-0.15% of Se, 0.08-0.14% of Cr, 0.05-0.1% of Sn, 0.04-0.06% of Ce, 0.02-0.04% of Tb, 0.02-0.03% of P, 0.01-0.02% of S and the balance of Fe. By adding alloy elements such as Nb, Be, Se, Sn, Ce and Tb and carrying out reasonable processes such as vermicularizing treatment, inoculation treatment, thermal treatment and the like, vermicular graphite cast iron improves the safety of the diesel engine cylinder body and prolongs the service life of the diesel engine cylinder body on the premise of ensuring relatively high mechanical strength.
Description
Technical field
The present invention relates to a kind of cast iron materials, be specifically related to a kind of diesel motor cylinder shock resistance vermicular graphite iron 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.Cast iron materials, owing to having good obdurability, thermotolerance, castability and damping characteristics, is the ideal material of diesel motor cylinder always.
But along with improving constantly of modern diesel engines power density, the mechanical load that diesel motor cylinder bears improves constantly, this just requires that cylinder block material has good impelling strength.And the impelling strength of the vermicular cast iron diesel motor cylinder material of China's production at present cannot can not meet service requirements.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of diesel motor cylinder shock resistance vermicular graphite iron material and preparation method thereof is provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of diesel motor cylinder shock resistance vermicular graphite iron material, its mass percent composition is: C3.6-3.9, Si2.3-2.7, Mn0.6-0.8, Nb0.3-0.45, Be0.2-0.3, Se0.1-0.15, Cr0.08-0.14, Sn0.05-0.1, Ce0.04-0.06, Tb0.02-0.04, P0.02-0.03, S0.01-0.02, surplus are Fe.
A preparation method for diesel motor cylinder shock resistance vermicular graphite iron material, comprises the following steps:
(1) take the furnace charges such as the pig iron, steel scrap, ferrosilicon, ferromanganese, ferro-niobium, foundry returns according to the basic chemical composition of above-mentioned design to join in medium-frequency induction furnace and carry out melting, smelting temperature is 1525-1550 DEG C; After furnace charge all melts, detect iron liquid chemical composition, come out of the stove in 1480-1510 DEG C after composition detection is qualified;
(2) before iron liquid is come out of the stove, should by the baking of cast pack processing, storing temperature is 350-400 DEG C, again 2/3 and iron filings of rare earth magnesium titanium vermiculizer, silicon titanate innoculant are placed in successively bag end tamping, then adopt the method that pours to be poured into by iron liquid in cast pack processing and carry out creepage rate and inoculation: first pour cast pack processing into by 2/3 of iron liquid in stove, remaining iron liquid is poured into cast pack processing after stirring, remaining 1/3 rare silicon titanate innoculant is added with stream simultaneously, then add plant ash in iron liquid surface; Compactedization has bred rear standing 3-5min, then sampling analysis, detect qualified after pour into a mould, teeming temperature controls at 1450-1465 DEG C;
(3) heat-treat the foundry goods of casting: be first heated to 360-420 DEG C, insulation 2-3h, reheats to 850-900 DEG C, insulation 4-6h, and water-cooled, to 540-580 DEG C, be incubated 3-4h, then air cooling is to 270-330 DEG C, insulation 1-2h; Then be heated to 580-620 DEG C, insulation 3-4h, reheats to 905-935 DEG C, insulation 5-8h, and oil cooling, to 560-590 DEG C, be incubated 3-4h, then air cooling is to 310-340 DEG C, insulation 1.5-2.5h; Finally be heated to 680-740 DEG C, insulation 3-5h, air-cooled to 330-370 DEG C, insulation 2-3h, then air cooling is to normal temperature.
Beneficial effect of the present invention:
The present invention is by adding the technique such as the alloying elements such as Nb, Be, Se, Sn, Ce, Tb and rational creepage rate, inoculation and thermal treatment, make vermicular cast iron under the prerequisite guaranteeing higher mechanical strength, improve impelling strength, thus substantially increase security and the work-ing life of diesel motor cylinder.
Specific embodiment mode
Embodiment
A kind of diesel motor cylinder shock resistance vermicular graphite iron material, its mass percent composition is: C3.6-3.9, Si2.3-2.7, Mn0.6-0.8, Nb0.3-0.45, Be0.2-0.3, Se0.1-0.15, Cr0.08-0.14, Sn0.05-0.1, Ce0.04-0.06, Tb0.02-0.04, P0.02-0.03, S0.01-0.02, surplus are Fe.
A preparation method for diesel motor cylinder shock resistance vermicular graphite iron material, comprises the following steps:
(1) take the furnace charges such as the pig iron, steel scrap, ferrosilicon, ferromanganese, ferro-niobium, foundry returns according to the basic chemical composition of above-mentioned design to join in medium-frequency induction furnace and carry out melting, smelting temperature is 1535 DEG C; After furnace charge all melts, detect iron liquid chemical composition, come out of the stove in 1505 DEG C after composition detection is qualified;
(2) before iron liquid is come out of the stove, should by the baking of cast pack processing, storing temperature is 370 DEG C, again 2/3 and iron filings of rare earth magnesium titanium vermiculizer, silicon titanate innoculant are placed in successively bag end tamping, then adopt the method that pours to be poured into by iron liquid in cast pack processing and carry out creepage rate and inoculation: first pour cast pack processing into by 2/3 of iron liquid in stove, remaining iron liquid is poured into cast pack processing after stirring, remaining 1/3 rare silicon titanate innoculant is added with stream simultaneously, then add plant ash in iron liquid surface; Compactedization has bred rear standing 4min, then sampling analysis, detect qualified after pour into a mould, teeming temperature controls at 1455 DEG C;
(3) heat-treat the foundry goods of casting: be first heated to 400 DEG C, insulation 2.5h, reheats to 880 DEG C, insulation 5h, water-cooled to 560 DEG C, insulation 3.5h, then air cooling to 280 DEG C, insulation 1h; Then be heated to 590 DEG C, insulation 3h, reheats to 925 DEG C, insulation 7h, oil cooling to 580 DEG C, insulation 4h, then air cooling to 315 DEG C, insulation 1.5h; Finally be heated to 710 DEG C, insulation 4h, air-cooled to 350 DEG C, insulation 2.5h, then air cooling is to normal temperature.
Through inspection, chemical composition is: C3.78, Si2.52, Mn0.74, Nb0.39, Be0.28, Se0.12, Cr0.011, Sn0.087, Ce0.058, Tb0.039, P0.024, S0.015, surplus are Fe.Its mechanical property is: tensile strength 397Mpa, yield strength 354Mpa, elongation 3.5%, impelling strength 18.1J/cm
2.
Claims (2)
1. a diesel motor cylinder shock resistance vermicular graphite iron material, it is characterized in that, its mass percent composition is: C3.6-3.9, Si2.3-2.7, Mn0.6-0.8, Nb0.3-0.45, Be0.2-0.3, Se0.1-0.15, Cr0.08-0.14, Sn0.05-0.1, Ce0.04-0.06, Tb0.02-0.04, P0.02-0.03, S0.01-0.02, surplus are Fe.
2. the preparation method of diesel motor cylinder shock resistance vermicular graphite iron material according to claim 1, is characterized in that, comprise the following steps:
(1) take the furnace charges such as the pig iron, steel scrap, ferrosilicon, ferromanganese, ferro-niobium, foundry returns according to the basic chemical composition of above-mentioned design to join in medium-frequency induction furnace and carry out melting, smelting temperature is 1525-1550 DEG C; After furnace charge all melts, detect iron liquid chemical composition, come out of the stove in 1480-1510 DEG C after composition detection is qualified;
(2) before iron liquid is come out of the stove, should by the baking of cast pack processing, storing temperature is 350-400 DEG C, again 2/3 and iron filings of rare earth magnesium titanium vermiculizer, silicon titanate innoculant are placed in successively bag end tamping, then adopt the method that pours to be poured into by iron liquid in cast pack processing and carry out creepage rate and inoculation: first pour cast pack processing into by 2/3 of iron liquid in stove, remaining iron liquid is poured into cast pack processing after stirring, remaining 1/3 rare silicon titanate innoculant is added with stream simultaneously, then add plant ash in iron liquid surface; Compactedization has bred rear standing 3-5min, then sampling analysis, detect qualified after pour into a mould, teeming temperature controls at 1450-1465 DEG C;
(3) heat-treat the foundry goods of casting: be first heated to 360-420 DEG C, insulation 2-3h, reheats to 850-900 DEG C, insulation 4-6h, and water-cooled, to 540-580 DEG C, be incubated 3-4h, then air cooling is to 270-330 DEG C, insulation 1-2h; Then be heated to 580-620 DEG C, insulation 3-4h, reheats to 905-935 DEG C, insulation 5-8h, and oil cooling, to 560-590 DEG C, be incubated 3-4h, then air cooling is to 310-340 DEG C, insulation 1.5-2.5h; Finally be heated to 680-740 DEG C, insulation 3-5h, air-cooled to 330-370 DEG C, insulation 2-3h, then air cooling is to normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510891628.XA CN105483514A (en) | 2015-12-08 | 2015-12-08 | Anti-impact vermicular graphite cast iron material for diesel engine cylinder body and preparation method for anti-impact vermicular graphite cast iron material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510891628.XA CN105483514A (en) | 2015-12-08 | 2015-12-08 | Anti-impact vermicular graphite cast iron material for diesel engine cylinder body and preparation method for anti-impact vermicular graphite cast iron material |
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| CN105483514A true CN105483514A (en) | 2016-04-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864368A (en) * | 2012-10-15 | 2013-01-09 | 南京信息工程大学 | Inoculated cast iron and preparation method thereof |
| CN104264036A (en) * | 2014-10-10 | 2015-01-07 | 西安工业大学 | Functional gradient cast iron material and preparation method thereof |
| CN105112765A (en) * | 2015-08-10 | 2015-12-02 | 霍邱县忠振耐磨材料有限公司 | High impact high chromium cast iron plate hammer and preparation method thereof |
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2015
- 2015-12-08 CN CN201510891628.XA patent/CN105483514A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864368A (en) * | 2012-10-15 | 2013-01-09 | 南京信息工程大学 | Inoculated cast iron and preparation method thereof |
| CN104264036A (en) * | 2014-10-10 | 2015-01-07 | 西安工业大学 | Functional gradient cast iron material and preparation method thereof |
| CN105112765A (en) * | 2015-08-10 | 2015-12-02 | 霍邱县忠振耐磨材料有限公司 | High impact high chromium cast iron plate hammer and preparation method thereof |
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Application publication date: 20160413 |