CN112176244A - Corrosion-resistant cast iron, cylinder sleeve and preparation method thereof - Google Patents
Corrosion-resistant cast iron, cylinder sleeve and preparation method thereof Download PDFInfo
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- CN112176244A CN112176244A CN202011117850.1A CN202011117850A CN112176244A CN 112176244 A CN112176244 A CN 112176244A CN 202011117850 A CN202011117850 A CN 202011117850A CN 112176244 A CN112176244 A CN 112176244A
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- cylinder sleeve
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- flake graphite
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 71
- 238000005260 corrosion Methods 0.000 title claims abstract description 37
- 230000007797 corrosion Effects 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052742 iron Inorganic materials 0.000 claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 30
- 239000010439 graphite Substances 0.000 claims abstract description 30
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 15
- 238000004381 surface treatment Methods 0.000 claims abstract description 15
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- 239000011593 sulfur Substances 0.000 claims abstract description 13
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 239000002054 inoculum Substances 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000009750 centrifugal casting Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 7
- 229910052729 chemical element Inorganic materials 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000007514 turning Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 238000002161 passivation Methods 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010705 motor oil Substances 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000000306 component Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 210000001787 dendrite Anatomy 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses corrosion-resistant cast iron, a cylinder sleeve and a preparation method thereof, wherein the cast iron is austenite cast iron and comprises the following components: 1.7-2.3 wt% of carbon, 1.6-2.2 wt% of silicon, 0.5-1.5 wt% of manganese, 0-0.2 wt% of phosphorus, 0-0.1 wt% of sulfur, 3.0-3.5 wt% of chromium, 20-25 wt% of nickel, 0-0.8 wt% of copper and the balance of matrix iron, wherein the carbon is flake graphite. The cast iron matrix is austenite, contains a large amount of Ni and Cr, and Cr and oxygen are combined in the air to form a passivation film which uniformly covers the surface, so that new Cr-containing oxide can be rapidly formed after the cast iron surface is damaged and covers the exposed surface, and the metal is protected from oxidation corrosion; ni can effectively stabilize austenite, and the thermodynamic stability of the austenitic cast iron material is improved; the cylinder sleeve is made of austenite corrosion-resistant cast iron, and the wear resistance of the inner surface of the cylinder sleeve is improved through surface treatment, so that the conditions of corrosive wear and frictional wear are effectively relieved, and the technical problems of increase of engine oil consumption, reduction of power and reduction of the service life of an engine caused by abrasion of the cylinder sleeve are effectively solved.
Description
Technical Field
The invention relates to the technical field of cast iron, in particular to corrosion-resistant cast iron, a cylinder sleeve and a preparation method thereof.
Background
The cylinder sleeve is a core component of an engine, and forms a pair of friction pairs running at high speed together with a piston ring, the cylinder sleeve runs under complex and changeable working conditions of high temperature, high pressure, alternating load, corrosion and the like for a long time, the abrasion of the cylinder sleeve is caused by one of the multiple reasons of abrasion of the cylinder sleeve due to the severe working environment, the abrasion of the cylinder sleeve can cause the increase of the oil consumption and the reduction of power of the engine, and the service life of the engine is shortened.
The corrosive wear is caused by that acid gas is generated when fuel in the cylinder sleeve of the engine is combusted, when the acid gas and water vapor are combined to form acid solution, the acid solution is condensed on the wall of the cylinder sleeve, the existing cylinder sleeve material has poor corrosion resistance, the acid solution can generate corrosion action on the inner surface of a cylinder, and corrosive substances are gradually scraped off by a piston ring in friction to cause the wear deformation of the cylinder sleeve. The S, Cl content in oil used in some areas is higher, and corrosive wear is more likely to occur. Along with the gradual development of the internal combustion engine technology, the trend of diversification of internal combustion engine fuel is more and more obvious, and besides traditional diesel oil, the corrosion and abrasion conditions caused by newly added methane, natural gas, methanol, ethanol and the like are gradually increased.
Therefore, it is necessary to develop a new corrosion-resistant cast iron material that can be applied to a cylinder liner.
Disclosure of Invention
The invention aims to provide corrosion-resistant cast iron, a cylinder sleeve and a preparation method thereof, and aims to solve the technical problems that in the prior art, the corrosion resistance of the cylinder sleeve is poor, corrosive wear is easy to occur, the oil consumption of an engine is increased, the power is reduced, and the service life of the engine is shortened.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in a first aspect, the present invention provides a corrosion-resistant cast iron, which is an austenitic cast iron, comprising the following components: 1.7-2.3 wt% of carbon, 1.6-2.2 wt% of silicon, 0.5-1.5 wt% of manganese, 0-0.2 wt% of phosphorus, 0-0.1 wt% of sulfur, 3.0-3.5 wt% of chromium, 20-25 wt% of nickel, 0-0.8 wt% of copper and the balance of matrix iron, wherein the carbon is flake graphite.
In one embodiment of the present invention, the flake graphite in the cast iron is uniformly distributed flake graphite, flake graphite having a tendency to orient in the positions of dendrites, or a combination thereof; the flake graphite on the surface of the cast iron is uniformly distributed flake graphite, flake graphite with inclination orientation in the positions of dendritic crystals, flake graphite with fine arbitrary orientation in the positions of the dendritic crystals or a combination of the flake graphite, the flake graphite and the flake graphite; the matrix iron has fine acicular carbides at grain boundaries or at inter-granular corners.
In a second aspect, the invention provides a preparation method of the corrosion-resistant cast iron, which comprises the following steps:
s1, weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, copper, stainless steel scraps, a low-sulfur carburant, a pretreating agent, and various combinations of ferrosilicon, ferromanganese, ferrochrome, nickel and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1550-1650 ℃, and smelting to obtain primary molten iron;
s3, adding the primary molten iron and the primary inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature to 1450-1550 ℃, and simultaneously carrying out slag skimming to ensure the purity degree to obtain secondary molten iron;
and S4, casting the secondary molten iron obtained in the step S3 to obtain the casting molten iron.
In one embodiment of the present invention, the primary inoculant in the step S3 is a coarse-grained inoculant, and the mass ratio of the primary inoculant to the molten primary iron is (4.5-5.5): 1000.
In a third aspect, the invention provides a cylinder liner, which is made of the corrosion-resistant cast iron.
In one embodiment of the present invention, the hardness of the inner bore working surface of the cylinder liner is 140-220 HBS.
In one embodiment of the invention, the tensile strength of the cylinder sleeve is greater than or equal to 320 Mpa.
In a fourth aspect, the present invention provides a method for manufacturing the cylinder liner, including the steps of:
s1, weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, copper, stainless steel scraps, a low-sulfur carburant, a pretreating agent, and various combinations of ferrosilicon, ferromanganese, ferrochrome, nickel and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1550-1650 ℃, and smelting to obtain primary molten iron;
s3, adding the primary molten iron and the primary inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature to 1450-1550 ℃, and simultaneously carrying out slag skimming to ensure the purity degree to obtain secondary molten iron;
s4, adjusting the temperature of the secondary molten iron obtained in the step S3 to 1370-1430 ℃, controlling the internal temperature of the cylinder sleeve mold to 350-420 ℃, pouring the secondary molten iron into the cylinder sleeve mold, adding a secondary inoculant, performing centrifugal casting by using a centrifugal casting machine, cooling and demolding to obtain a blank;
s5, performing outer circle turning on the blank obtained in the step S4, honing an inner hole to a finished product, and then performing surface treatment on the finished product.
In one embodiment of the present invention, the secondary inoculant in the step S4 is a fine-line inoculant, and the mass ratio of the secondary inoculant to the molten secondary iron is (1.5-2.5): 1000.
in one embodiment of the present invention, the surface treatment of step S5 is:
(1) cleaning and deoiling the cylinder sleeve, preheating to 370-390 ℃, and preserving heat for 1 h;
(2) hoisting the preheated cylinder sleeve into molten nitrided salt, introducing compressed air, heating to 550 ℃, keeping the temperature for 2 hours, stopping compressing the air, and continuing to keep the temperature for 22 hours to obtain the nitrided cylinder sleeve;
(3) airing and cooling the nitrided cylinder sleeve, and then hanging the cylinder sleeve into oxidizing salt to keep the temperature at 390-410 ℃ for 5-15 min to obtain an oxidized cylinder sleeve;
(4) and cooling and cleaning the oxidized cylinder sleeve, polishing an inner hole, and finely machining an outer circle to obtain the cylinder sleeve.
The cast iron material matrix has low hardness, so that the surface treatment is increased to improve the wear resistance, the surface treatment adopts a method of firstly nitriding at high temperature and then oxidizing, after the surface treatment, the depth of a white bright layer is 4-10 mu m, the depth of a surface composite treatment layer is more than or equal to 0.1mm, the surface hardness is more than or equal to 600HV0.1, and the wear resistance of the surface of the cylinder sleeve is effectively improved.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with cast iron with a pearlite matrix adopted by the traditional cylinder liner, the cast iron disclosed by the invention has the advantages that the matrix is austenite, contains a large amount of Ni and Cr, the Cr element and the oxygen element are combined in air to form a thin invisible Cr-containing oxide, namely a passivation film, the passivation film uniformly covers the surface of metal to form a protective layer, if the metal is cut or scratched or the passivation film is damaged, the new Cr-containing oxide can be rapidly formed and covers the exposed surface to protect the metal from oxidation corrosion; ni can effectively stabilize austenite, so that the cast iron material obtains a complete austenite structure, thereby the cast iron has good strength, plasticity and toughness and excellent machinability, and simultaneously the thermodynamic stability of the austenitic cast iron material is improved, so that the austenitic cast iron material has better corrosion resistance and wear resistance;
2. the cylinder sleeve is made of austenite corrosion-resistant cast iron, so that the corrosion resistance of the cylinder sleeve is effectively improved, and the wear resistance of the inner surface of the cylinder sleeve is improved through surface treatment, so that the corrosion wear and the friction wear are effectively relieved, the service life of the cylinder sleeve is greatly prolonged, and the technical problems of increase of engine oil consumption, reduction of power and reduction of the service life of an engine caused by the wear of the cylinder sleeve are effectively solved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a scanning electron microscope image of a fourth embodiment of the present invention.
Fig. 2 is a graph showing a comparison of the corrosion resistance test of example five of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The first embodiment is as follows:
the embodiment discloses corrosion-resistant cast iron, which is austenite cast iron and comprises the following components: 1.7 wt% carbon, 2.2 wt% silicon, 1.5 wt% manganese, 0.05 wt% phosphorus, 0.1 wt% sulfur, 3.0 wt% chromium, 25 wt% nickel and the balance matrix iron, the carbon being flake graphite.
Example two:
the embodiment discloses corrosion-resistant cast iron, which is austenite cast iron and comprises the following components: 2 wt% carbon, 1.8 wt% silicon, 1 wt% manganese, 0.1 wt% phosphorus, 0.05 wt% sulfur, 3.2 wt% chromium, 22 wt% nickel, 0.4 wt% copper and the balance matrix iron, the carbon being flake graphite.
Example three:
the embodiment discloses corrosion-resistant cast iron, which is austenite cast iron and comprises the following components: 1.7-2.3 wt% of carbon, 1.6 wt% of silicon, 0.5 wt% of manganese, 0.2 wt% of phosphorus, 0.02 wt% of sulfur, 3.5 wt% of chromium, 20 wt% of nickel, 0.8 wt% of copper and the balance of matrix iron, wherein the carbon is flake graphite.
Example four:
in this example, the cast iron of the first example was subjected to characterization analysis to obtain a scanning electron micrograph shown in fig. 1, wherein a is a 100-fold magnified micrograph of the interior of the cast iron, b is a 500-fold magnified micrograph of the interior of the cast iron, and c is a 100-fold magnified micrograph of the surface of the cast iron.
As shown in fig. 1, the length of flake graphite in the cast iron of example one was rated 5, and the distribution of the flake graphite inside included a uniform distribution and a distribution having a tendency toward distribution in the positions of dendrites, i.e., a type a distribution and a type E distribution specified in ISO 945-1-2008 cast iron microstructure; the surface flake graphite also presents fine randomly oriented flake graphite in the dendrite positions, i.e., the D-type distribution specified in ISO 945-1-2008 cast iron microstructure.
Fine acicular carbide is arranged on the grain boundary or the corner between grains, the fine acicular carbide is formed by carbon and other alloy substances in the austenitic cast iron, the hardness and the stability of the austenitic cast iron can be improved by the fine acicular carbide, and the wear resistance and the corrosion resistance of the austenitic cast iron are improved.
Example five:
the cast iron of example two was subjected to an anti-corrosion test, and was placed in two identical vessels with the cast iron of example two, as shown in fig. 2 a.
Adding 10% equivalent sulfuric acid into the two containers, standing and observing, wherein the ordinary cast iron reacts strongly at the beginning and bubbles continuously emerge, while the cast iron of the second embodiment has few bubbles, and after 15h, the graph of 2b is obtained; the cast iron of example two and the ordinary cast iron were taken out to obtain FIG. 2 c.
It can be seen from FIGS. 2b and 2c that the conventional cast iron has been corroded seriously and has a material falling off, but the cast iron of example two has only a reduced surface gloss and no material corrosion.
Therefore, the cast iron of example two has a stronger corrosion resistance than the general cast iron.
Example six:
the present embodiment discloses a cylinder liner made of the corrosion-resistant cast iron of the first embodiment, which is manufactured by the following steps:
s1 weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, stainless steel scrap iron, a low-sulfur recarburizing agent, a pretreating agent, ferrosilicon, ferromanganese, ferrochrome, a nickel plate and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1600 ℃, and smelting to obtain primary molten iron;
s3, adding 10KG of primary molten iron and 50g of coarse Ningxin inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature at 1500 ℃, and simultaneously slagging off to ensure the purity to obtain secondary molten iron;
s4, adjusting the temperature of the secondary molten iron obtained in the step S3 to 1400 ℃, controlling the internal temperature of the cylinder sleeve mold to 380 ℃, pouring the secondary molten iron into the cylinder sleeve mold, adding 20g of a fine Ning plate inoculant, performing centrifugal casting by using a centrifugal casting machine, cooling and demolding to obtain a blank;
s5, performing outer circle turning on the blank obtained in the step S4, honing an inner hole to a finished product, and then performing surface treatment on the finished product.
The surface treatment of step S5 is:
(1) cleaning and deoiling the cylinder sleeve, preheating to 380 ℃, and preserving heat for 1 h;
(2) hoisting the preheated cylinder sleeve into molten nitrided salt, introducing compressed air, heating to 550 ℃, keeping the temperature for 2 hours, stopping compressing the air, and continuing to keep the temperature for 22 hours to obtain the nitrided cylinder sleeve;
(3) airing and cooling the nitrided cylinder sleeve, and then hanging the cylinder sleeve into oxidizing salt to keep the temperature at 400 ℃ for 10min to obtain an oxidized cylinder sleeve;
(4) and cooling and cleaning the oxidized cylinder sleeve, polishing an inner hole, and finely machining an outer circle to obtain the cylinder sleeve.
Example seven:
the embodiment discloses a cylinder liner prepared from the corrosion-resistant cast iron of the second embodiment, and the cylinder liner is prepared by the following steps:
s1 weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, waste copper, stainless steel scrap iron, a low-sulfur recarburizing agent, a pretreating agent, ferrosilicon, ferromanganese, ferrochrome, a copper plate, a nickel plate and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1550 ℃, and smelting to obtain primary molten iron;
s3, adding 10KG of the primary molten iron obtained in the step S2 and 45g of coarse Ningban inoculant into a heat-insulating ladle, controlling the temperature at 1450 ℃, and simultaneously slagging off to ensure the purity to obtain secondary molten iron;
s4, adjusting the temperature of the secondary molten iron obtained in the step S3 to 1430 ℃, controlling the internal temperature of the cylinder sleeve mold to 350 ℃, pouring the secondary molten iron into the cylinder sleeve mold, adding 25g of a fine Ning plate inoculant, performing centrifugal casting by using a centrifugal casting machine, cooling and demolding to obtain a blank;
s5, performing outer circle turning on the blank obtained in the step S4, honing an inner hole to a finished product, and then performing surface treatment on the finished product.
The surface treatment of step S5 is:
(1) cleaning and deoiling the cylinder sleeve, preheating to 390 ℃, and preserving heat for 1 h;
(2) hoisting the preheated cylinder sleeve into molten nitrided salt, introducing compressed air, heating to 530 ℃, keeping the temperature for 2 hours, stopping compressing the air, and keeping the temperature for 22 hours to obtain a nitrided cylinder sleeve;
(3) airing and cooling the nitrided cylinder sleeve, and then hanging the cylinder sleeve into oxidizing salt to keep the temperature at 390 ℃ for 15min to obtain an oxidized cylinder sleeve;
(4) and cooling and cleaning the oxidized cylinder sleeve, polishing an inner hole, and finely machining an outer circle to obtain the cylinder sleeve.
Example eight:
the present embodiment discloses a cylinder liner prepared by using the corrosion-resistant cast iron of the third embodiment, which is prepared by the following steps:
s1, weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, waste copper, stainless steel scrap iron, a low-sulfur recarburizing agent, a pretreating agent, ferrosilicon, ferromanganese, ferrochrome, a copper plate and a nickel plate;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1650 ℃, and smelting to obtain primary molten iron;
s3, adding 10KG of primary molten iron and 55g of coarse Ningxin inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature at 1450 ℃, and simultaneously slagging off to ensure the purity to obtain secondary molten iron;
s4, adjusting the temperature of the secondary molten iron obtained in the step S3 to 1370 ℃, controlling the internal temperature of the cylinder sleeve mold to 420 ℃, pouring the secondary molten iron into the cylinder sleeve mold, adding 15g of a fine Ning plate inoculant, performing centrifugal casting by using a centrifugal casting machine, cooling and demolding to obtain a blank;
s5, performing outer circle turning on the blank obtained in the step S4, honing an inner hole to a finished product, and then performing surface treatment on the finished product.
The surface treatment of step S5 is:
(1) cleaning and deoiling the cylinder sleeve, preheating to 390 ℃, and preserving heat for 1 h;
(2) hoisting the preheated cylinder sleeve into molten nitrided salt, introducing compressed air, heating to 570 ℃, keeping the temperature for 2 hours, stopping compressing the air, and keeping the temperature for 22 hours to obtain the nitrided cylinder sleeve;
(3) airing and cooling the nitrided cylinder sleeve, and then hanging the cylinder sleeve into oxidized salt to preserve the temperature for 15min at 410 ℃ to obtain an oxidized cylinder sleeve;
(4) and cooling and cleaning the oxidized cylinder sleeve, polishing an inner hole, and finely machining an outer circle to obtain the cylinder sleeve.
Example nine:
tensile strength and bore face hardness measurements were made for the cylinder liners of examples six through eight, and the following table was obtained.
| Hardness of inner hole working surface (HBS) | Tensile strength | |
| EXAMPLE five | 210 | 350 |
| EXAMPLE six | 180 | 341 |
| EXAMPLE seven | 175 | 345 |
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The corrosion-resistant cast iron is characterized by being austenite cast iron and comprising the following components: 1.7-2.3 wt% of carbon, 1.6-2.2 wt% of silicon, 0.5-1.5 wt% of manganese, 0-0.2 wt% of phosphorus, 0-0.1 wt% of sulfur, 3.0-3.5 wt% of chromium, 20-25 wt% of nickel, 0-0.8 wt% of copper and the balance of matrix iron, wherein the carbon is flake graphite.
2. The corrosion-resistant cast iron according to claim 1, wherein the flake graphite inside the cast iron is uniformly distributed flake graphite, flake graphite having a tendency to orient in the inter-dendritic position, or a combination of both; the flake graphite on the surface of the cast iron is uniformly distributed flake graphite, flake graphite with inclination orientation in the positions of dendritic crystals, flake graphite with fine arbitrary orientation in the positions of the dendritic crystals or a combination of the flake graphite, the flake graphite and the flake graphite; the matrix iron has fine acicular carbides at grain boundaries or at inter-granular corners.
3. A method for the preparation of corrosion-resistant cast iron according to claim 1 or 2, characterized in that it comprises the following steps:
s1, weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, copper, stainless steel scraps, a low-sulfur carburant, a pretreating agent, and various combinations of ferrosilicon, ferromanganese, ferrochrome, nickel and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1550-1650 ℃, and smelting to obtain primary molten iron;
s3, adding the primary molten iron and the primary inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature to 1450-1550 ℃, and simultaneously carrying out slag skimming to ensure the purity degree to obtain secondary molten iron;
and S4, casting the secondary molten iron obtained in the step S3 to obtain the casting molten iron.
4. The method for preparing corrosion-resistant cast iron according to claim 3, wherein the primary inoculant in the step S3 is a coarse-grained inoculant, and the mass ratio of the primary inoculant to the molten primary iron is (4.5-5.5): 1000.
5. A cylinder liner, characterized in that it is made of the corrosion-resistant cast iron according to claim 1 or 2.
6. The cylinder liner according to claim 5, characterized in that the inner bore working surface hardness of the cylinder liner is 140-220 HBS.
7. The cylinder liner according to claim 5, characterized in that the tensile strength of the cylinder liner is 320MPa or more.
8. A method for manufacturing a cylinder liner according to any one of claims 5 to 7, characterized by comprising the steps of:
s1 weighing raw materials according to chemical element components of cast iron, wherein the raw materials comprise pig iron, copper, stainless steel scraps, a low-sulfur carburant, a pretreating agent, ferrosilicon, ferromanganese, ferrochrome, nickel and ferrous sulfide;
s2, adding the raw materials into a smelting furnace, controlling the temperature at 1550-1650 ℃, and smelting to obtain primary molten iron;
s3, adding the primary molten iron and the primary inoculant obtained in the step S2 into a heat-preservation bag, controlling the temperature to 1450-1550 ℃, and simultaneously carrying out slag skimming to ensure the purity degree to obtain secondary molten iron;
s4, adjusting the temperature of the secondary molten iron obtained in the step S3 to 1370-1430 ℃, controlling the internal temperature of the cylinder sleeve mold to 350-420 ℃, pouring the secondary molten iron into the cylinder sleeve mold, adding a secondary inoculant, performing centrifugal casting by using a centrifugal casting machine, cooling and demolding to obtain a blank;
s5, performing outer circle turning on the blank obtained in the step S4, honing an inner hole to a finished product, and then performing surface treatment on the finished product.
9. The method for manufacturing the cylinder liner according to claim 8, wherein the secondary inoculant in the step S4 is a fine-line inoculant, and the mass ratio of the secondary inoculant to the molten secondary iron is (1.5-2.5): 1000.
10. the manufacturing method of a cylinder liner according to claim 8, characterized in that the surface treatment of step S5 is:
(1) cleaning and deoiling the cylinder sleeve, preheating to 370-390 ℃, and preserving heat for 1 h;
(2) hoisting the preheated cylinder sleeve into molten nitrided salt, introducing compressed air, heating to 530-570 ℃, keeping the temperature for 2 hours, stopping compressing the air, and keeping the temperature for 22 hours to obtain the nitrided cylinder sleeve;
(3) airing and cooling the nitrided cylinder sleeve, and then hanging the cylinder sleeve into oxidizing salt to keep the temperature at 390-410 ℃ for 5-15 min to obtain an oxidized cylinder sleeve;
(4) and cooling and cleaning the oxidized cylinder sleeve, polishing an inner hole, and finely machining an outer circle to obtain the cylinder sleeve.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61177356A (en) * | 1985-01-31 | 1986-08-09 | Shimazu Kinzoku Seiko Kk | High-nickel austenitic vermicular graphite cast iron with low thermal expansion |
| JP2018123392A (en) * | 2017-02-02 | 2018-08-09 | アイシン高丘株式会社 | Disc rotor excellent in rust prevention |
| CN109689909A (en) * | 2016-08-24 | 2019-04-26 | 世倍特集团有限责任公司 | For the iron material of high temperature resistant bearing insert, by the made bearing insert of the material and there is the exhaust gas turbocharger of this bearing insert |
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2020
- 2020-10-19 CN CN202011117850.1A patent/CN112176244B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61177356A (en) * | 1985-01-31 | 1986-08-09 | Shimazu Kinzoku Seiko Kk | High-nickel austenitic vermicular graphite cast iron with low thermal expansion |
| CN109689909A (en) * | 2016-08-24 | 2019-04-26 | 世倍特集团有限责任公司 | For the iron material of high temperature resistant bearing insert, by the made bearing insert of the material and there is the exhaust gas turbocharger of this bearing insert |
| JP2018123392A (en) * | 2017-02-02 | 2018-08-09 | アイシン高丘株式会社 | Disc rotor excellent in rust prevention |
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Denomination of invention: A corrosion-resistant cast iron, cylinder liner and its preparation method Effective date of registration: 20231209 Granted publication date: 20210525 Pledgee: Yangzhou Branch of Zheshang Bank Co.,Ltd. Pledgor: YANGZHOU WUTINGQIAO CYLINDER LINER CO.,LTD. Registration number: Y2023980070064 |