CN104762547A - Marine low speed diesel engine cylinder liner casting method - Google Patents
Marine low speed diesel engine cylinder liner casting method Download PDFInfo
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- CN104762547A CN104762547A CN201510084208.0A CN201510084208A CN104762547A CN 104762547 A CN104762547 A CN 104762547A CN 201510084208 A CN201510084208 A CN 201510084208A CN 104762547 A CN104762547 A CN 104762547A
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- molten iron
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- engine cylinder
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Abstract
A marine low speed diesel engine cylinder liner casting method comprises the following steps: phosphorus component of molten iron is controlled to be 0.14-0.16%, vanadium component of molten iron is controlled to be 0.2-0.4%, boron component of molten iron is controlled to be 0.035-0.045%, carbon component of molten iron is controlled to be 3.0-3.4%, and the sulfur content is controlled to be less than 0.04%, when the composition of the molten iron is qualified, the molten iron is heated and discharged; first 0.08-0.14% of a nodulizer is put at the bottom of a processing bag, then the nodulizer is uniformly covered with 0.45-0.55% of a modifier, the modifier is covered with 0.2-0.3% of silicon barium alloy, and finally the surface is covered with a steel plate; when the temperature of the molten iron is risen to 1480 to 1490 DEG C, the molten iron is discharged for modification treatment; in the modification treatment process of the molten iron, 0.1 to 0.15% of an inoculants is added into a molten iron ladle for inoculation; the molten iron is poured into a casting mold; through the above steps, a marine low speed diesel engine cylinder liner is obtained. By selection of appropriate content of alloy elements for alloying, the strength of the cylinder liner is improved; rare earth magnesium is used for modification treatment, graphite is uniformly distributed, the end part is obviously passivated, a hard phase is in a broken mesh shape and uniformly distributed, the cylinder liner section sensitivity is improved; and by use of an antimony-containing inoculants for inoculation treatment, the precipitation of ferrite is inhibited, and the cylinder service life is increased.
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 sleeve, belongs to thick large ironcasting, and the type foundry goods work under bad environment, subjects the effect of the cavitation corrosion caused by galvanic corrosion and transverse vibration.Along with Novel diesel engine improving constantly the technical requirements such as stroke, explosion pressure, the obdurability of cylinder sleeve, wear resistance are had higher requirement.Cylinder sleeve often selects antifriction cast iron materials, this is not only because its damping property, heat conductivity are good, and because under the condition that lubrication is insufficient, cast iron be dispersed with store lubricating oil and there is the graphite of self-lubricating, but graphite has the effect of isolating and reduction effect to matrix, reduces the obdurability of cylinder sleeve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of marine low speed diesel engine cylinder sleeve cast method, can improve graphite, hard-phase morphology and distribution, meets the requirement of marine low speed diesel engine cylinder sleeve high strength, high-wear resistance.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of marine low speed diesel engine cylinder sleeve cast method, comprises the following steps:
One, control iron liquid composition phosphorus 0.14 ~ 0.16% by weight percentage, vanadium 0.2 ~ 0.4%, boron 0.035-0.045%, carbon content 3.0 ~ 3.4%, sulphur content lower than 0.04%, the qualified rear intensification of iron liquid composition, to come out of the stove;
Two, molten iron Metamorphism treatment and inoculation
First 0.08 ~ 0.14% nodulizing agent is by weight percentage placed at the bottom of pack processing, then 0.45-0.55% alterant uniform fold is by weight percentage on nodulizing agent, covering weight percentages 0.2 ~ 0.3% Si-Ba alloy thereon, finally at surface coverage steel plate;
When molten iron temperature rises to 1480 ~ 1490 DEG C, come out of the stove and carry out Metamorphism treatment;
In molten iron Metamorphism treatment process, in hot metal ladle, add weight percent 0.1-0.15% nucleating agent carry out inoculation;
Three, carry out except Slag treatment to the rear molten iron that goes bad, breeds, after slagging-off terminates, molten iron pours into casting mold;
Marine low speed diesel engine cylinder sleeve is obtained by above step.
In step one, sulphur content is 0.01 ~ 0.04%.
In step one, warming temperature is 1480-1500 DEG C.
Described nodulizing agent is rare earth magnesium, and wherein the content of parts by weights meter is Mg 6-7%, Re 1.5-2.5%, and all the other are 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 nucleating agent is the content of SbSi parts by weights meter is Sb 8-10%, Si 60-65%.
A kind of marine low speed diesel engine cylinder sleeve cast method provided by the invention, selects the alloying element of proper content to carry out alloying, improves cylinder sleeve intensity; Adopt rare earth magnesium to carry out Metamorphism treatment, evenly and the obvious passivation in end, hard phase is suspension shape and is evenly distributed Graphite Distribution, improves the sensitivity profile of cylinder sleeve; Utilize and carry out inoculation containing antimony nucleating agent, inhibit ferrite to separate out, improve cylinder sleeve over-all properties, improve its work-ing life.Alleviate graphite to matrix isolate effect while improve casting section susceptibility.Product of the present invention, at normal temperatures wherein σ
bbe greater than 270MPa, A is greater than 0.3%, and hardness reaches HB200-260.Being also advantageous in that of the inventive method: simple to operate, successful, effectively can improve the work-ing life of marine low speed diesel engine cylinder sleeve.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the section metallograph in the product prepared of the inventive method under 100 times of magnifying glasses.
Fig. 2 is the section metallograph in the product prepared of the inventive method under 100 times of magnifying glasses.
Fig. 3 is the Graphite Distribution figure in the product prepared of the inventive method under 100 times of magnifying glasses.
Fig. 4 is the Graphite Distribution figure in the product prepared of the inventive method under 100 times of magnifying glasses.
Embodiment
A kind of marine low speed diesel engine cylinder sleeve cast method, comprises the following steps:
One, select the pig iron, steel scrap prepares burden, melt in intermediate frequency furnace; Chemical composition adjustment is carried out according to stokehold spectrum analyzer; Control iron liquid composition phosphorus 0.14 ~ 0.16% by weight percentage, vanadium 0.2 ~ 0.4%, boron 0.035-0.045%, carbon content 3.0 ~ 3.4%, sulphur content lower than 0.04%, the qualified rear intensification of iron liquid composition, to come out of the stove;
Warming temperature is 1480-1500 DEG C.
Vanadium is carbide, can form the strengthening phase particle of stable high rigidity, and Dispersed precipitate in the base, and can significantly refinement flake graphite and pearlite matrix;
Boron forms boron-carbide in foundry goods, all can separate out the carbide containing boron phase of intermittently netted or continuous net-shaped distribution solidifying latter stage eutectic cell grain boundaries;
Phosphorus forms binary iron phosphide eutectic, and when having boron to exist, form boracic iron phosphide eutectic with boron, this microhardness of organizing is higher, and antifriction performance obtains larger improvement.
Two, molten iron Metamorphism treatment and inoculation
First 0.08 ~ 0.14% nodulizing agent is by weight percentage placed at the bottom of pack processing, then 0.45-0.55% alterant uniform fold is by weight percentage on nodulizing agent, covering weight percentages 0.2 ~ 0.3% Si-Ba alloy thereon, finally at the Carbon Steel Plate that surface coverage 5-7 ㎜ is thick;
When molten iron temperature rises to 1480 ~ 1490 DEG C, come out of the stove and carry out Metamorphism treatment;
In molten iron Metamorphism treatment process, in hot metal ladle, add weight percent 0.1-0.15% nucleating agent carry out inoculation;
Three, carry out except Slag treatment to the rear molten iron that goes bad, breeds, after slagging-off terminates, molten iron pours into casting mold;
Marine low speed diesel engine cylinder sleeve is obtained by above step.
In preferred protocol step one, sulphur content is 0.01 ~ 0.04%.
In preferred scheme, described nodulizing agent is rare earth magnesium, and wherein the content of parts by weights meter is Mg 6-7%, Re 1.5-2.5%, and all the other are 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%, and all the other are 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 nucleating agent is the content of SbSi parts by weights meter is Sb 8-10%, Si 60-65%.
Claims (7)
1. a marine low speed diesel engine cylinder sleeve cast method, is characterized in that comprising the following steps:
One, control iron liquid composition phosphorus 0.14 ~ 0.16% by weight percentage, vanadium 0.2 ~ 0.4%, boron 0.035-0.045%, carbon content 3.0 ~ 3.4%, sulphur content lower than 0.04%, the qualified rear intensification of iron liquid composition, to come out of the stove;
Two, molten iron Metamorphism treatment and inoculation
First 0.08 ~ 0.14% nodulizing agent is by weight percentage placed at the bottom of pack processing, then 0.45-0.55% alterant uniform fold is by weight percentage on nodulizing agent, covering weight percentages 0.2 ~ 0.3% Si-Ba alloy thereon, finally at surface coverage steel plate;
When molten iron temperature rises to 1480 ~ 1490 DEG C, come out of the stove and carry out Metamorphism treatment;
In molten iron Metamorphism treatment process, in hot metal ladle, add weight percent 0.1-0.15% nucleating agent carry out inoculation;
Three, carry out except Slag treatment to the rear molten iron that goes bad, breeds, after slagging-off terminates, molten iron pours into casting mold;
Marine low speed diesel engine cylinder sleeve 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, sulphur 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 nodulizing agent is rare earth magnesium, wherein the content of parts by weights meter is Mg 6-7%, Re 1.5-2.5%, and all the other are iron.
5. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, it is characterized in that: described alterant is rare earth magnesium, wherein the content of parts by weights meter is Mg 3-4%, Re 8-10%.
6. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, is characterized in that: the content of described Si-Ba alloy parts by weights meter is Ca 1-2%, Ba 2-4%, Si 70-75%.
7. a kind of marine low speed diesel engine cylinder sleeve cast method according to claim 1, is characterized in that: described nucleating agent is the content of SbSi parts by weights meter is Sb 8-10%, Si 60-65%.
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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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| CN104762547A true CN104762547A (en) | 2015-07-08 |
| CN104762547B CN104762547B (en) | 2017-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111036886A (en) * | 2019-11-14 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Process design method for centrifugal composite high-alloy steel roller core material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061803A (en) * | 1991-12-23 | 1992-06-10 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| CN1884601A (en) * | 2005-06-24 | 2006-12-27 | 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 |
| CN104313454A (en) * | 2014-01-22 | 2015-01-28 | 河南科技大学 | Multi-component microalloyed bainite gray cast iron, cylinder liner and preparation method thereof |
-
2015
- 2015-02-16 CN CN201510084208.0A patent/CN104762547B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061803A (en) * | 1991-12-23 | 1992-06-10 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| CN1884601A (en) * | 2005-06-24 | 2006-12-27 | 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 |
| CN104313454A (en) * | 2014-01-22 | 2015-01-28 | 河南科技大学 | Multi-component microalloyed bainite gray cast iron, cylinder liner and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111036886A (en) * | 2019-11-14 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Process design method for centrifugal composite high-alloy steel roller core material |
| CN111036886B (en) * | 2019-11-14 | 2022-03-29 | 唐山钢铁集团有限责任公司 | Process design method for centrifugal composite high-alloy steel roller core material |
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| CN104762547B (en) | 2017-05-31 |
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