CN104131216B - A kind of phosphorus niobium cast iron cylinder cover and preparation method thereof - Google Patents
A kind of phosphorus niobium cast iron cylinder cover and preparation method thereof Download PDFInfo
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- CN104131216B CN104131216B CN201410351934.XA CN201410351934A CN104131216B CN 104131216 B CN104131216 B CN 104131216B CN 201410351934 A CN201410351934 A CN 201410351934A CN 104131216 B CN104131216 B CN 104131216B
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Abstract
The present invention relates to a kind of phosphorus niobium cast iron cylinder cover, the chemical composition of described cylinder jacket material is counted as following weight percent: carbon: 2.8～3.1%, silicon: 1.8～2.2%, manganese: 2.0～2.3%, 0 ＜ sulphur≤0.12%, phosphorus 0.2～0.4%, niobium 0.2～0.3%, cerium: 0.01～0.02%, surplus is Fe.The graphite shape of cylinder jacket of the present invention is mainly A type, a small amount of D+E type, and matrix is pearlite, and free ferrite is less than 3%.The working surface hardness of cylinder jacket is 270-320HB, and tensile strength sigma b is 350-400MPa, be suitable for the present age at a high speed, use on high strengthening, high-performance, low emission, long-life internal combustion engine, and manufacture of materials cost is relatively low.
Description
Technical field
The invention belongs to cylinder sleeve technology field, be specifically related to a kind of phosphorus niobium cast iron cylinder cover and preparation method thereof.
Background technology
At present, cylinder jacket material mostly is alloy gray cast-iron material, and such as materials such as phosphorus alloy cast iron, boron alloy cast iron, V-Ti cast iron, copper Mo-Ni alloy cast irons, their matrix is all based on pearlite, Tensile strength is generally 200-300MPa, and hardness is 220-260HB；Such cylinder jacket can not meet high-speed high-power, high detonation pressure, low emission, the requirement of high performance and long service life internal combustion engine.
As-cast bainite gray cast iron material cylinder jacket, adds nickel and molybdenum alloy, and its matrix is as-cast bainite, and after heat treatment tensile strength is more than 370MPa, and hardness is 270-310HB；But this kind of cylinder jacket manufacture of materials cost is high.
Summary of the invention
Present invention aim at providing a kind of phosphorus niobium cast iron cylinder cover and preparation method thereof, this cylinder jacket has preferable tensile strength and hardness.
For achieving the above object, the technical scheme that the present invention takes is as follows:
A kind of phosphorus niobium cast iron cylinder cover, the chemical composition of described cylinder jacket material counts as following weight percent:
Carbon (C): 2.8～3.1%, silicon (Si): 1.8～2.2%, manganese (Mn): 2.0～2.3%, 0 ＜ sulphur (S)≤0.12%, phosphorus (P) 0.2～0.4%, niobium (Nb) 0.2～0.3%, cerium (Ce): 0.01～0.02%, surplus is Fe.
The preparation method of above-mentioned phosphorus niobium cast iron cylinder cover, it comprises the steps:
Carrying out dispensing the most in proportion, obtain iron liquid with frequency-conversion electric induction furnace melting ingredient, controlling iron liquid tapping temperature is 1480～1520 DEG C；
2. adding iron liquid weight 0.55～the inovulant process of 0.65% before coming out of the stove, described inovulant is silicon barium calcium inovulant, silicon strontium inovulant or silicon titanate innoculant (such inovulant belongs to silica-based high-efficiency long-acting complex class inovulant)；
3. metal mold wet coating material centrifugal casting common process is used to produce cylinder sleeve cast part (as the horizontal centrifugal casting machine of routine can be used, mould uses metal type dies, the conventional wet coating material of dies cavity spraying to produce).After foundry goods depanning, general nature is cooled to room temperature, is then placed in foundry goods frame.
The graphite shape of the pearlite gray cast iron cylinder jacket of phosphorus niobium alloy of the present invention is mainly A type, a small amount of D+E type, and matrix is pearlite (see figure 2), and free ferrite is shown in Fig. 1 less than 3%().The working surface hardness of cylinder jacket is 270-320HB, and tensile strength sigma b is 350-400MPa, be suitable for the present age at a high speed, use on high strengthening, high-performance, low emission, long-life internal combustion engine, and manufacture of materials cost is relatively low.
The present invention, on the basis of carbon, sulphur, silicon, phosphorus, manganese common element chemical composition, suitably increases P elements, and manganese element content is significantly increased, and adds niobium alloy element, mainly can play following effect:
1, the effect of manganese: improve the stability of austenite, reduces austenite from being transformed into perlite temperature, and the spread improving pearlite is had important effect, makes acquisition fine pearlite, sorbite become inevitable under the conditions of continuous coo1ing.High manganese element make casting pig have high intensity, well durability, shrink little, internal stress is little.
2, the effect of phosphorus: P elements is to promote graphite element in cast iron, and it can reduce the super cooling tendency of iron liquid, and he can form iron phosphide eutectic simultaneously；Iron phosphide eutectic is hard phase, and it can significantly improve the wearability of matrix material in the most netted or dispersed distribution.
3, the effect of niobium: for graphitization, niobium is neutral element, and the impact on cylinder sleeve cast part graphite shape, distribution is the most little.Niobium element is strong carbon, nitride forming element, they have the strongest affinity with carbon nitrogen, NbC, Nb(C, N can be formed in the cylinder jacket of the present invention respectively) etc. the carbon of high rigidity, nitride, in Dispersed precipitate, with the complex matrix of pearlite matrix composition high-wearing feature, its microhardness reaches more than Hv2200.The strengthening of matrix can be played good effect by niobium element.
4, the effect of cerium: adjust iron liquid composition fluctuations, is passivated graphite, reduces matrix and isolates.
Compared to the prior art, the invention have the advantages that
After cylinder jacket of the present invention adds niobium alloy element, there is the combination properties such as high intensity, high-wearing feature, high performance-price ratio；Being better than the casting pig of existing common alloy pearlite matrix, wearability is significantly improved；Mechanical performance (including tensile strength, hardness) is far above the alloy gray cast-iron of existing common pearlite matrix, suitable with bainite matrix cylinder jacket, but its production cost reduces, and cost performance is high, is the product having very much the market advantage.
Accompanying drawing explanation
Fig. 1 is the matrix metallograph that cylinder jacket of the present invention amplifies 100 times；
Fig. 2 is the matrix metallograph that cylinder jacket of the present invention amplifies 500 times, can be seen that the Morphology of pearlite of matrix in figure.
Detailed description of the invention
Below by way of preferred embodiment, the present invention is described in further detail, but protection scope of the present invention is not limited thereto.
Embodiment
1
A kind of phosphorus niobium cast iron cylinder cover, the chemical composition of described cylinder jacket material counts as following weight percent:
| Element | C | Si | Mn | S | P | Nb | Ce | Iron |
| Percentage by weight (%) | 2.95 | 2.02 | 2.09 | 0.035 | 0.241 | 0.27 | 0.018 | Surplus |
The preparation method of above-mentioned phosphorus niobium cast iron cylinder cover, it comprises the steps:
Carrying out dispensing the most in proportion, obtain iron liquid with frequency-conversion electric induction furnace melting ingredient, controlling iron liquid tapping temperature is 1503 DEG C；
2. the silicon barium calcium inovulant adding iron liquid weight 0.6% before coming out of the stove processes；
3. metal mold wet coating material centrifugal casting common process is used to produce cylinder sleeve cast part.After foundry goods depanning, naturally it is cooled to room temperature, is then placed in foundry goods frame.
The tensile strength producing gained cylinder jacket is 400MPa, and hardness is 295HB.
Embodiment
2
A kind of phosphorus niobium cast iron cylinder cover, the chemical composition of described cylinder jacket material counts as following weight percent:
| Element | C | Si | Mn | S | P | Nb | Ce | Iron |
| Percentage by weight (%) | 3.01 | 2.09 | 2.05 | 0.043 | 0.283 | 0.25 | 0.012 | Surplus |
The preparation method of above-mentioned phosphorus niobium cast iron cylinder cover, it comprises the steps:
Carrying out dispensing the most in proportion, obtain iron liquid with frequency-conversion electric induction furnace melting ingredient, controlling iron liquid tapping temperature is 1498 DEG C；
2. the silicon strontium inovulant adding iron liquid weight 0.55% before coming out of the stove processes；
3. metal mold wet coating material centrifugal casting common process is used to produce cylinder sleeve cast part.After foundry goods depanning, naturally it is cooled to room temperature, is then placed in foundry goods frame.
The tensile strength producing gained cylinder jacket is 384MPa, and hardness is 292HB.
Claims (2)
1. a phosphorus niobium cast iron cylinder cover, it is characterised in that the chemical composition of described cylinder jacket material is counted as following weight percent:
Carbon: 2.8～3.1%, silicon: 1.8～2.2%, manganese: 2.0～2.3%, 0 ＜ sulphur≤0.12%, phosphorus 0.2～0.4%, niobium 0.2～0.3%, cerium: 0.01～0.02%, surplus is Fe；
The preparation method of described phosphorus niobium cast iron cylinder cover comprises the steps:
Carrying out dispensing the most in proportion, obtain iron liquid with frequency-conversion electric induction furnace melting ingredient, controlling iron liquid tapping temperature is 1480～1520 DEG C；
2. adding iron liquid weight 0.55～the inovulant process of 0.65% before coming out of the stove, described inovulant is silicon barium calcium inovulant, silicon strontium inovulant or silicon titanate innoculant；
3. metal mold wet coating material centrifugal casting common process is used to produce cylinder sleeve cast part.
2. the preparation method of phosphorus niobium cast iron cylinder cover described in claim 1, it is characterised in that comprise the steps:
Carrying out dispensing the most in proportion, obtain iron liquid with frequency-conversion electric induction furnace melting ingredient, controlling iron liquid tapping temperature is 1480～1520 DEG C；
2. adding iron liquid weight 0.55～the inovulant process of 0.65% before coming out of the stove, described inovulant is silicon barium calcium inovulant, silicon strontium inovulant or silicon titanate innoculant；
3. metal mold wet coating material centrifugal casting common process is used to produce cylinder sleeve cast part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410351934.XA CN104131216B (en) | 2014-07-23 | 2014-07-23 | A kind of phosphorus niobium cast iron cylinder cover and preparation method thereof |
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| CN201410351934.XA CN104131216B (en) | 2014-07-23 | 2014-07-23 | A kind of phosphorus niobium cast iron cylinder cover and preparation method thereof |
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| CN104131216A CN104131216A (en) | 2014-11-05 |
| CN104131216B true CN104131216B (en) | 2016-08-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104911467B (en) * | 2015-07-07 | 2016-10-05 | 中原内配集团股份有限公司 | A kind of intercritical hardening cylinder jacket and preparation method thereof |
| US11193446B2 (en) | 2016-08-10 | 2021-12-07 | Zynp Corporation | Needle-shaped cylinder liner and preparation method therefor, and coating liquid for preparing needle-shaped cylinder liner |
| CN106270370B (en) * | 2016-08-10 | 2019-02-19 | 中原内配集团股份有限公司 | A kind of needle prick shape cylinder jacket and preparation method thereof |
| CN106191646B (en) * | 2016-08-31 | 2018-07-27 | 中原内配集团股份有限公司 | A kind of high-quality cylinder jacket and preparation method thereof and ferroalloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60247036A (en) * | 1984-05-22 | 1985-12-06 | Mitsui Eng & Shipbuild Co Ltd | Cv-cast iron cylinder liner |
| CN1084901A (en) * | 1992-09-29 | 1994-04-06 | 济南铁路局配件厂华商铸造厂 | Beeliner niobium casting iron cylinder jacket and piston ring |
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN103667861A (en) * | 2012-08-30 | 2014-03-26 | 日本活塞环株式会社 | Cylinder sleeve |
-
2014
- 2014-07-23 CN CN201410351934.XA patent/CN104131216B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60247036A (en) * | 1984-05-22 | 1985-12-06 | Mitsui Eng & Shipbuild Co Ltd | Cv-cast iron cylinder liner |
| CN1084901A (en) * | 1992-09-29 | 1994-04-06 | 济南铁路局配件厂华商铸造厂 | Beeliner niobium casting iron cylinder jacket and piston ring |
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN103667861A (en) * | 2012-08-30 | 2014-03-26 | 日本活塞环株式会社 | Cylinder sleeve |
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Address after: 454750 Huaihe Road, Mengzhou industrial agglomeration area, Henan, China, No. 69, No. Applicant after: Central Plains Nei Pei Group Plc Address before: 454750 No. 146 Han Yu Avenue, Mengzhou, Henan, Jiaozuo Applicant before: Zhongyuan Neipei Co., Ltd., Henan Prov. |
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Inventor after: Sun Shigui Inventor after: Xu Chao Inventor after: Zhang Liangliang Inventor after: Jiang Yuling Inventor before: Xu Chao Inventor before: Zhang Liangliang Inventor before: Xue Zhenyu Inventor before: Jiang Yuling |
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