CN104762547B - Marine low speed diesel engine cylinder sleeve cast method - Google Patents
Marine low speed diesel engine cylinder sleeve cast method Download PDFInfo
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- CN104762547B CN104762547B CN201510084208.0A CN201510084208A CN104762547B CN 104762547 B CN104762547 B CN 104762547B CN 201510084208 A CN201510084208 A CN 201510084208A CN 104762547 B CN104762547 B CN 104762547B
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Abstract
A kind of marine low speed diesel engine cylinder sleeve cast method, comprises the following steps：Control iron liquid composition phosphorus 0.14 ~ 0.16%, vanadium 0.2 ~ 0.4%, boron 0.035 ~ 0.045%, carbon content 3.0 ~ 3.4%, sulfur content are less than 0.04%, are heated up after iron liquid composition is qualified, come out of the stove；0.08 ~ 0.14% nodulizer is first placed on treatment bag bottom, then 0.45 0.55% alterant uniform fold covers 0.2 ~ 0.3% Si-Ba alloy thereon on nodulizer, finally covers steel plate on surface；When molten iron temperature rises to 1480 ~ 1490 DEG C, coming out of the stove carries out Metamorphism treatment；During molten iron Metamorphism treatment, 0.1 0.15% inovulant is added to carry out inoculation toward ladle；Molten iron pours into casting mold；Marine low speed diesel engine cylinder jacket is obtained by above step.The present invention carries out alloying from the alloying element of proper content, improves cylinder jacket intensity；Metamorphism treatment is carried out using rare earth magnesium, Graphite Distribution is uniform and end is substantially passivated, hard phase is in suspension shape and is evenly distributed, and improves the sensitivity profile of cylinder jacket；Inoculation is carried out using inovulant containing antimony, it is suppressed that ferrite is separated out, improve cylinder service life.
Description
Technical field
The present invention relates to casting field, particularly a kind of marine low speed diesel engine cylinder sleeve cast method.
Background technology
Marine low speed diesel engine cylinder jacket, belongs to thick big ironcasting, and the type casting work under bad environment subjects electrification
Learn the effect of corrosion and the cavitation damage caused by oscillation crosswise.As Novel diesel engine will to technologies such as stroke, explosion pressures
The continuous improvement asked, obdurability, wearability to cylinder jacket propose requirement higher.Cylinder jacket often selects antifriction cast iron material
Material, it is good to be not only because its damping property, heat conductivity, and because lubricate it is insufficient under conditions of, cast iron is dispersed with
Storage lubricating oil and the graphite with self-lubricating, but graphite to matrix have isolate effect and reduction effect, reduce cylinder
The obdurability of set.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of marine low speed diesel engine cylinder sleeve cast method, Neng Gougai
Kind graphite, hard-phase morphology and distribution, meet marine low speed diesel engine cylinder jacket high intensity, the requirement of high-wear resistance.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of marine low speed diesel engine cylinder jacket
Casting method, comprises the following steps：
First, control iron liquid composition phosphorus 0.14 ~ 0.16%, vanadium 0.2 ~ 0.4%, boron 0.035- by weight percentage
0.045%th, carbon content 3.0 ~ 3.4%, sulfur content is less than 0.04%, is heated up after iron liquid composition is qualified, come out of the stove；
2nd, molten iron Metamorphism treatment and inoculation
0.08 ~ 0.14% nodulizer by weight percentage is first placed on treatment and wraps bottom, then by weight percentage
0.45-0.55% alterant uniform folds on nodulizer, the Si-Ba alloy of covering weight percentages 0.2 ~ 0.3% thereon, most
Afterwards steel plate is covered on surface；
When molten iron temperature rises to 1480 ~ 1490 DEG C, coming out of the stove carries out Metamorphism treatment；
During molten iron Metamorphism treatment, percentage by weight 0.1-0.15% inovulants are added to carry out womb toward ladle
Reason；
3rd, carried out except Slag treatment to going bad, breeding rear molten iron, after slagging-off terminates, molten iron pours into casting mold；
Marine low speed diesel engine cylinder jacket is obtained by above step.
In step one, sulfur content is 0.01 ~ 0.04%.
In step one, warming temperature is 1480-1500 DEG C.
Described nodulizer is rare earth magnesium, and the wherein content of parts by weights meter is Mg 6-7%, RE 1.5-2.5%, and remaining is
Iron.
Described alterant is rare earth magnesium, and wherein the content of parts by weights meter is Mg 3-4%, RE 8-10%.
The content of described Si-Ba alloy parts by weights meter is Ca 1-2%, Ba 2-4%, Si 70-75%.
Described inovulant is Sb 8-10%, Si 60-65% for the content of SbSi parts by weights meters.
A kind of marine low speed diesel engine cylinder sleeve cast method that the present invention is provided, the alloying element from proper content enters
Row alloying, improves cylinder jacket intensity；Metamorphism treatment is carried out using rare earth magnesium, Graphite Distribution is uniform and end is substantially passivated,
Hard phase is in suspension shape and is evenly distributed, and improves the sensitivity profile of cylinder jacket；Using inovulant containing antimony carry out inoculation,
Inhibit ferrite to separate out, improve cylinder jacket combination property, improve its service life.Work is isolated to matrix graphite is mitigated
With while improve casting section sensitiveness.Product of the invention, at normal temperatures wherein σbMore than 270MPa, A is more than 0.3%, firmly
Degree reaches HB200-260.The advantage of the inventive method is also resided in：Simple to operate, effect substantially, can effectively improve marine low-speed bavin
The service life of oil machine cylinder jacket.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Section metallograph in the product that Fig. 1 is prepared for the inventive method under 100 times of magnifying glasses.
Section metallograph in the product that Fig. 2 is prepared for the inventive method under 100 times of magnifying glasses.
Graphite Distribution figure in the product that Fig. 3 is prepared for the inventive method under 100 times of magnifying glasses.
Graphite Distribution figure in the product that Fig. 4 is prepared for the inventive method under 100 times of magnifying glasses.
Specific embodiment
A kind of marine low speed diesel engine cylinder sleeve cast method, comprises the following steps：
First, dispensing is carried out from the pig iron, steel scrap, is melted in intermediate frequency furnace；Chemical composition is carried out according to stokehold spectroanalysis instrument
Adjustment；Control iron liquid composition phosphorus 0.14 ~ 0.16% by weight percentage, vanadium 0.2 ~ 0.4%, boron 0.035-0.045%, carbon contain
Amount 3.0 ~ 3.4%, sulfur content is less than 0.04%, is heated up after iron liquid composition is qualified, come out of the stove；
Warming temperature is 1480-1500 DEG C.
Vanadium is carbide, can be formed stabilization high rigidity hardening constituent particle, Dispersed precipitate in the base,
And can significantly refine flake graphite and pearlite matrix；
Boron forms boron-carbide in casting, can separate out discontinuously netted or continuous net in solidification latter stage eutectic cell grain boundaries
The carbide containing boron phase of shape distribution；
Phosphorus forms binary iron phosphide eutectic, has in the presence of boron, and boracic iron phosphide eutectic is formed with boron, and this tissue microhardness is higher,
Antifriction performance obtains larger improvement.
2nd, molten iron Metamorphism treatment and inoculation
0.08 ~ 0.14% nodulizer by weight percentage is first placed on treatment and wraps bottom, then by weight percentage
0.45-0.55% alterant uniform folds on nodulizer, the Si-Ba alloy of covering weight percentages 0.2 ~ 0.3% thereon, most
Afterwards in the carbon steel plate that surface covering 5-7 ㎜ are thick；
When molten iron temperature rises to 1480 ~ 1490 DEG C, coming out of the stove carries out Metamorphism treatment；
During molten iron Metamorphism treatment, percentage by weight 0.1-0.15% inovulants are added to carry out womb toward ladle
Reason；
3rd, carried out except Slag treatment to going bad, breeding rear molten iron, after slagging-off terminates, molten iron pours into casting mold；
Marine low speed diesel engine cylinder jacket is obtained by above step.
In preferred protocol step one, sulfur content is 0.01 ~ 0.04%.
In preferred scheme, described nodulizer is rare earth magnesium, and wherein the content of parts by weights meter is Mg 6-7%, RE
1.5-2.5%, remaining is iron.
In preferred scheme, described alterant is rare earth magnesium, and wherein the content of parts by weights meter is Mg 3-4%, RE
8-10%, remaining is iron.
In preferred scheme, the content of described Si-Ba alloy parts by weights meter is Ca 1-2%, Ba 2-4%, Si 70-
75%。
In preferred scheme, described inovulant is that the content of SbSi parts by weights meters is Sb 8-10%, Si 60-65%.
Claims (5)
1. a kind of marine low speed diesel engine cylinder sleeve cast method, it is characterized in that comprising the following steps：
First, control iron liquid composition phosphorus 0.14 ~ 0.16%, vanadium 0.2 ~ 0.4%, boron 0.035-0.045%, carbon by weight percentage
Content 3.0 ~ 3.4%, sulfur content is less than 0.04%, is heated up after iron liquid composition is qualified, come out of the stove；
2nd, molten iron Metamorphism treatment and inoculation
0.08 ~ 0.14% nodulizer by weight percentage is first placed on treatment bag bottom, then 0.45- by weight percentage
0.55% alterant uniform fold on nodulizer, the Si-Ba alloy of covering weight percentages 0.2 ~ 0.3% thereon, finally in table
Face covers steel plate；
Described nodulizer is rare earth magnesium, and the wherein content of parts by weights meter is Mg 6-7%, RE 1.5-2.5%, and remaining is iron；
When molten iron temperature rises to 1480 ~ 1490 DEG C, coming out of the stove carries out Metamorphism treatment；
Described alterant is rare earth magnesium, and wherein the content of parts by weights meter is Mg 3-4%, RE 8-10%；
During molten iron Metamorphism treatment, percentage by weight 0.1-0.15% inovulants are added to carry out inoculation toward ladle；
3rd, carried out except Slag treatment to going bad, breeding rear molten iron, after slagging-off terminates, molten iron pours into casting mold；
Marine low speed diesel engine cylinder jacket is obtained by above step.
2. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, it is characterized in that：In step one,
Sulfur content is 0.01 ~ 0.04%.
3. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, it is characterized in that：In step one,
Warming temperature is 1480-1500 DEG C.
4. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, it is characterized in that：Described silicon barium
The content of alloy parts by weights meter is Ca 1-2%, Ba 2-4%, Si 70-75%.
5. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, it is characterized in that：Described breeds
Agent is Sb 8-10%, Si 60-65% for the content of SbSi parts by weights meters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510084208.0A CN104762547B (en) | 2015-02-16 | 2015-02-16 | Marine low speed diesel engine cylinder sleeve cast method |
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| CN201510084208.0A CN104762547B (en) | 2015-02-16 | 2015-02-16 | Marine low speed diesel engine cylinder sleeve cast method |
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| CN104762547B true CN104762547B (en) | 2017-05-31 |
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| CN1021060C (en) * | 1991-12-23 | 1993-06-02 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| CN100387744C (en) * | 2005-06-24 | 2008-05-14 | 上海上大热欣科技发展有限公司 | Boron phosphor alloy continuous casting section bar for iron casting and its production method |
| RU2448185C1 (en) * | 2011-04-18 | 2012-04-20 | Юлия Алексеевна Щепочкина | Cast iron |
| CN104313454B (en) * | 2014-01-22 | 2016-03-30 | 河南科技大学 | A kind of multicomponent microalloying bainite gray cast iron, steam jacket and preparation method thereof |
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