CN103938067A - CGI cast iron applied to cylinder block of diesel engines with high output and production method for the same - Google Patents
CGI cast iron applied to cylinder block of diesel engines with high output and production method for the same Download PDFInfo
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- CN103938067A CN103938067A CN201410188450.8A CN201410188450A CN103938067A CN 103938067 A CN103938067 A CN 103938067A CN 201410188450 A CN201410188450 A CN 201410188450A CN 103938067 A CN103938067 A CN 103938067A
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 109
- 238000004519 manufacturing process Methods 0.000 title abstract description 32
- 239000011777 magnesium Substances 0.000 claims abstract description 72
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 56
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 48
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 33
- 239000010949 copper Substances 0.000 claims abstract description 33
- 239000011572 manganese Substances 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 19
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 239000010703 silicon Substances 0.000 claims abstract description 14
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 239000010439 graphite Substances 0.000 claims description 23
- 229910002804 graphite Inorganic materials 0.000 claims description 23
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 239000011574 phosphorus Substances 0.000 claims description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 14
- 239000005864 Sulphur Substances 0.000 claims description 14
- 229910001126 Compacted graphite iron Inorganic materials 0.000 abstract description 17
- 238000005266 casting Methods 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 description 23
- 239000000463 material Substances 0.000 description 14
- 229910001141 Ductile iron Inorganic materials 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- 239000000976 ink Substances 0.000 description 6
- 239000002667 nucleating agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to cast iron applied to the cylinder block of diesel engines with high output, and more particularly, to a compacted graphite iron (CGI) cast iron having an improved casting property, stable tensile strength and yield strength, and hardness in an appropriate range, by being produced with the amounts of carbon (C), silicon (Si), manganese (Mn), copper (Cu), tin (Sn), and magnesium (Mg) controlled, and a production method thereof.
Description
The application is divisional application, and the application number of its original application is 201080058709.7, and the applying date is on December 8th, 2010, and denomination of invention is " CGI cast iron and manufacture method thereof ".
Technical field
The present invention relates to cast iron and manufacture method thereof, in more detail, relate to the content that adds the composition in iron by control to, thereby castibility is improved and has cast iron and the manufacture method thereof of stable tensile strength and yield strength.Cast iron according to the present invention belongs to hypereutectic (hypereutectic) CGI (compacted graphite iron: vermicular cast iron) cast iron of the cylinder body of the diesel motor that can be specially adapted to high-output power.
Background technology
In recent years, because environmental regulation is strengthened, therefore reduce the content as the environmental pollutants of Cox or NOx and so on of discharging from engine and be inevitable.
The in the situation that of diesel motor, above-mentioned as the output of the environmental pollutants of Cox or NOx and so in order to reduce, need to improve the explosion pressure of engine.So, in order to improve the explosion pressure of engine, need to improve the intensity of the cylinder body of engine.
The material that was in the past generally used for cylinder body is cast iron, but plain cast iron (common grade cast iron) is generally graphitic cast iron.Graphitic cast iron generates graphite because carbon in the time casting separates and is with grey, and therefore it is called as graphitic cast iron.
Conventionally, cast iron produces very big-difference according to the form of the graphite comprising in matrix, size, distribution, and the tensile strength that is commonly called the graphitic cast iron of cast iron is about 15kg/mm
2～20kg/mm
2left and right.Although graphitic cast iron as described above has excellent castibility, damping capacity and thermal conductivity, intensity is low, and the material that is therefore used as the cylinder body of engine is conditional.
As the cast iron of physical property that has improved such graphitic cast iron, there is nodular cast iron.Nodular cast iron (spherical graphite cast iron) is to make in common cast iron (graphitic cast iron) tissue the graphite that occurs change over globular structure and improve the cast iron of toughness from original lamellar structure.Such nodular cast iron is also referred to as spheroidal graphite cast iron (nodular cast iron) or ductile cast iron (ductile cast iron).Above-mentioned nodular cast iron is in aspect excellences such as wear resistance, thermotolerance, solidity to corrosions, and compared with common graphitic cast iron, coefficient of elasticity is large, and Brinell hardness reaches 200 left and right, and machinability is also better than having the plain cast iron of same rigidity.
But, the in the situation that of nodular cast iron, although there is the required high strength of cylinder body, castibility deficiency in the time manufacturing complicated form, and there is low thermal conductivity, the cylinder body that is therefore applicable to complicated form is limited.
Therefore, in recent years, CGI (compacted graphite iron: the vermicular cast iron) cast iron that is suitable for the high strength that has excellent castibility, damping capacity and the thermal conductivity of above-mentioned graphitic cast iron and have nodular cast iron and certain extensibility is as cylinder body material of new generation.
Such CGI cast iron can be by by nodular cast iron liquation splendid attire during to pit-iron ladle (ladle), accurately controlling the content of magnesium (Mg) manufactures, described nodular cast iron liquation is in smelting furnace, nodular cast iron material carried out to melting and obtain, and described pit-iron ladle is the utensil of the stoste of fusing being transferred to elsewhere.
In CGI cast iron, in order to ensure stable mechanical properties (tensile strength), melting/splendid attire temperature and magnesium amount etc. need to be accurately controlled, for this reason, accurate control device and operating personnel's proficiency, the senior pig iron that use foreign matter content is low etc. must be needed.Although carry out this accurate control, but exist as inferior problem: due to the error being produced under the multiple required conditions such as Mg content, splendid attire position, splendid attire temperature, splendid attire speed, bad material and casting that CGI cast iron usually occurs are bad.
Summary of the invention
Technical task
The present invention produces stable physical property and can not cast in bad scope by the content of carbon (C), silicon (Si), manganese (Mn), copper (Cu), tin (Sn) and magnesium (Mg) is controlled at, thereby the tensile strength of providing (Tensile Strength) and yield strength (Yield Strength) are adjusted in respectively the cast iron within the scope of 500MPa～600MPa, 350MPa～450MPa.
The object of the invention is to, by accurately controlling the amount of magnesium (Mg), there is stable physical property and the cast iron of tissue thereby provide.Particularly, the object of the invention is to, the cast iron applicable to the cylinder body of high-output power high pass filter diesel motor is also provided.
The present invention also aims to, by thering is stable tensile strength and yield strength and thering is suitable hardness (Hardness), thereby establish chemical constitution and the manufacture method that can manufacture applicable to the cast iron of the cylinder body of high-output power high pass filter diesel motor.
Solve problem means
The invention provides a kind of cast iron, the iron (Fe) of magnesium (Mg), the phosphorus (P) below 0.04 % by weight, the sulphur (S) below 0.02 % by weight and the residual content of the copper (Cu) of the silicon (Si) of its carbon that comprises 3.65 % by weight～3.75 % by weight with respect to all wts (C), 2.0 % by weight～2.25 % by weight, the manganese (Mn) of 0.3 % by weight～0.6 % by weight, 1.2 % by weight～1.4 % by weight, the tin (Sn) of 0.07 % by weight～0.10 % by weight, 0.008 % by weight～0.018 % by weight.
According to an example of the present invention, the tensile strength of above-mentioned cast iron (Tensile Strength) is the scope of 500MPa～600MPa.In addition,, according to another example of the present invention, the yield strength of above-mentioned cast iron (Yield Strength) is the scope of 350MPa～450MPa.On the other hand, the Brinell hardness number of above-mentioned cast iron (BHW) is in 255～280 scope.
According to an example of the present invention, make the carbon equivalent (CE:Carbon Equivalent) of above-mentioned cast iron in 4.35～4.5 scope.
According to an example of the present invention, nodularization (Nodularity) rate of the graphite being formed by above-mentioned carbon can be 5%～20% left and right.
The manufacture method that the invention provides a kind of cast iron, it comprises:
Manufacture the step of cast iron stoste, in smelting furnace, following cast iron materials is carried out to melting, manufacture the cast iron stoste of melting, the iron (Fe) of manganese (Mn), the phosphorus (P) below 0.04 % by weight, the sulphur (S) below 0.02 % by weight and the residual content of the carbon (C) that described cast iron materials comprises 3.65 % by weight～3.75 % by weight with respect to all wts, the silicon (Si) of 2.0 % by weight～2.25 % by weight, 0.3 % by weight～0.6 % by weight;
At the container of the cast iron stoste for the above-mentioned smelting furnace melting of splendid attire, in pit-iron ladle (ladle), put into the step of copper (Cu), the tin (Sn) of 0.07 % by weight～0.10 % by weight and the magnesium (Mg) of 0.008 % by weight～0.018 % by weight of 1.2 % by weight～1.4 % by weight;
Manufacture the step of metal, pit-iron ladle by the cast iron stoste splendid attire of above-mentioned manufacture to above-mentioned copper (Cu), the tin (Sn) of 0.07 % by weight～0.10 % by weight and the magnesium (Mg) of 0.008 % by weight～0.018 % by weight of putting into 1.2 % by weight～1.4 % by weight, manufactures metal;
Determine the step of the magnesium amount that will increase, grasp the Mg content comprising in the above-mentioned metal being contained in pit-iron ladle, determine the magnesium amount that will increase;
Add the step of magnesium, the magnesium of the above-mentioned determined amount that will increase is added in the metal being contained in above-mentioned pit-iron ladle; And
The above-mentioned metal that is added with magnesium is injected into the step in mould.
In the present invention, at the container of the cast iron stoste for the melting of splendid attire smelting furnace, in pit-iron ladle, put into the magnesium (Mg) of specified amount, appropriate copper (Cu) and tin (Sn), then by cast iron stoste splendid attire in pit-iron ladle, make graphite crystallization, to form stable CGI, and obtain having the CGI cast iron of stable mechanical characteristics.
According to an example of the present invention, regulate the carbon equivalent (CE:Carbon Equivalent) in above-mentioned cast iron stoste, to be 4.35～4.5 left and right.
In addition, according to an example of the present invention, regulate the splendid attire temperature of above-mentioned cast iron stoste, to be 1520 ± 10 DEG C.
According to an example of the present invention, in the step of above-mentioned interpolation magnesium, can utilize silk (wire) shape magnesium nucleating agent, magnesium is bred.
According to cast iron of the present invention in the situation that, can estimate by the content of the magnesium that comprises in metal the nodularization rate of the graphite comprising in cast iron, can estimate according to the scope of the intensity of above-mentioned nodularization rate.
In the present invention, the content of magnesium can be according to the difference of desirable strength and difference, and in order to be applicable to the cylinder body of high-output power diesel motor, making its content is 0.008 % by weight～0.018 % by weight.
Invention effect
According to the present invention, by accurately controlling the amount of magnesium (Mg), and control the amount of copper (Cu) and tin (Sn), thereby can provide the cast iron of the yield strength of tensile strength, 350MPa～450MPa scope with 500MPa～600MPa scope and the Brinell hardness of 255～280 scope.
Cast iron according to the present invention, owing to having stable tensile strength and yield strength, having suitable hardness, therefore can be used in the cylinder body of manufacturing applicable to high-output power high pass filter diesel motor.
In addition,, according to the present invention, by critically controlling the amount of magnesium (Mg), thereby can manufacture the high strength with the cylinder body degree used for diesel engine that can be used in high pass filter the CGI cast iron with homogeneous structure.In addition, by controlling the amount as copper (Cu) and the tin (Sn) of alloying element, can manufacture the CGI cast iron can with multiple hardness and tensile strength.
Brief description of the drawings
Fig. 1 is the graphic representation of the relation of the nodularization rate of explanation magnesium (Mg) content and graphite.
Fig. 2 is the graphic representation of the explanation nodularization rate of graphite and the relation of tensile strength (Tensile Strength) and yield strength (Yield Strength).
Fig. 3 is the chart that the state of the relation of magnesium (Mg) content and tensile strength and the representative tissue of cast iron is shown.As a reference, 1MPa is equivalent to 1N/mm
2.
Fig. 4 illustrates the example according to the manufacturing process of cast iron of the present invention briefly.
Embodiment
By concrete example, be described in more detail the present invention below.
The manganese (Mn) of the carbon (C) that cast iron according to the present invention comprises 3.65 % by weight～3.75 % by weight with respect to all wts, the silicon (Si) of 2.0 % by weight～2.25 % by weight, 0.3 % by weight～0.6 % by weight, the copper (Cu) of 1.2 % by weight～1.4 % by weight, the tin (Sn) of 0.07 % by weight～0.10 % by weight, the magnesium (Mg) of 0.008 % by weight～0.018 % by weight; Comprise phosphorus (P) and the sulphur below 0.02 % by weight (S) below 0.04 % by weight; And the iron that comprises residual content (Fe).Cast iron of the present invention is taking iron (Fe) as basic material.
Next, in the present invention, what content of each moiety of above-mentioned cast iron is described.
1) carbon (C) 3.65 % by weight～3.75 % by weight
Carbon adds for crystallization goes out to wriggle China ink (compacted graphite), if according to carbon in cast iron of the present invention containing quantity not sufficient 3.65 % by weight, in thinner wall section (thin-walled part), observe whitening (chill) phenomenon, if exceed 3.75 % by weight, can produce spheroidization of graphite and shrink and flow bad.Therefore, in the high strength cylinder body with multi-thickness, so bad in order to prevent, in the present invention, the content of carbon is defined as to 3.65 % by weight～3.75 % by weight.
2) silicon (Si) 2.0 % by weight～2.25 % by weight
Silicon is in the situation that adding with optimum proportion with carbon, and the crystallization amount maximization of the China ink (compacted graphite) that makes to wriggle, increases the intensity of cast iron.In cast iron according to the present invention, if silicon containing quantity not sufficient 2.0 % by weight, can produce the problem of wriggling crystallization amount black and reducing, if exceed 2.25 % by weight, can produce the problem that ductility reduces, therefore, its content is set as to 2.0 % by weight～2.25 % by weight.
3) manganese (Mn) 0.3 % by weight～0.6 % by weight
Manganese adds for miniaturization and the pearlitic stabilization of graphite, in cast iron according to the present invention, if manganese containing quantity not sufficient 0.3 % by weight, hardness declines, if exceed 0.6 % by weight, fragility increases, therefore, its content is set as to 0.3 % by weight～0.6 % by weight.
4) copper (Cu) 1.2 % by weight～1.4 % by weight
Copper is the element for the China inkization of wriggling, and it brings into play the effect that promotes pearlitic generation and make its miniaturization, and therefore copper is the element required in order to ensure intensity.In cast iron according to the present invention, in containing quantity not sufficient 1.2 % by weight of copper, cause undercapacity, still, even if its content exceedes 1.4 % by weight, be not equivalent to the additive effect of its amount of exceeding yet.Therefore,, in the present invention, the content of copper is set as to 1.2～1.4 % by weight.
5) tin (Sn) 0.07 % by weight～0.10 % by weight
Tin is the element that very powerful promotion perlite generates, the same with copper, to improve intensity as object interpolation.In cast iron according to the present invention, in containing quantity not sufficient 0.07 % by weight of tin, cause strength decreased, in the situation that exceeding 0.10 % by weight, fragility is sharply increased, therefore its content is set as to 0.07 % by weight～0.10 % by weight.
6) magnesium (Mg) 0.008 % by weight～0.018 % by weight
Magnesium has the function of the spheroidization of graphite of making (nodularity), and performance promotes to wriggle the generation of core and the effect of growth of China ink (compacted graphite).In cast iron according to the present invention, if magnesium containing quantity not sufficient 0.008 % by weight, graphite is in the form of sheets, if exceed 0.018 % by weight, the nodularization rate of graphite increases, and causes that contraction is bad, therefore its content is set as to 0.008 % by weight～0.018 % by weight scope.
7) below phosphorus (P) 0.04 % by weight
Phosphorus is one of impurity of naturally bringing in aerial cast iron manufacturing process.Although such phosphorus can play the effect that makes perlite stabilization, if its content exceedes 0.04 % by weight, make fragility sharply increase, this is relevant with the shrink defects due to segregation (segregation).Therefore,, in cast iron according to the present invention, preferably the content of phosphorus is controlled at below 0.04 % by weight.
In fact, being difficult to make the content of phosphorus in cast iron material composition is 0, is 0 even if make the content of phosphorus in cast iron material composition, also can bring phosphorus in the manufacturing process of cast iron into.Therefore,, in the present invention, it is very important that the content of phosphorus is no more than 0.04 % by weight.
8) below sulphur (S) 0.02 % by weight
Although sulphur performance is wriggled, the effect at the generation position of China ink (compacted graphite), in the situation that its content exceedes 0.02 % by weight, in order to generate the China ink of wriggling, need to append more magnesium., limiting under the state of content of magnesium, if more than the content of sulphur is increased to certain limit, can produce the China ink of wriggling (compacted graphite) problem in the form of sheets.Therefore,, in cast iron according to the present invention, the content of sulphur is controlled at below 0.02 % by weight.
In fact, being also difficult to make the content of sulphur in cast iron material composition is 0, is 0 even if make the content of sulphur in cast iron material composition, also can bring sulphur in the manufacturing process of cast iron into.Therefore, in the present invention, it is very important that the content of sulphur is no more than 0.02 % by weight.
9) iron (Fe)
Iron is the main raw according to cast iron of the present invention.The composition of the residual content except mentioned component is iron.
According to an example of the present invention, making carbon equivalent (carbon equivalent) is 4.35～4.5.In cast iron according to the present invention, if carbon equivalent less than 4.35, can produce whitening (chill) tendency of thinner wall section (thin-walled part), if exceed 4.5, because primary graphite (primary graphite) produces too much, can produce shrink and flow bad, therefore by its circumscription 4.35～4.5.Now, carbon equivalent (CE) is defined as carbon+(silicon+phosphorus) × 1/3, in order to control physical property and the quality of product, can regulate this value.
According to an example of the present invention, the tensile strength of above-mentioned cast iron (Tensile Strength) is 500MPa～600MPa, and yield strength (Yield Strength) is 350MPa～450MPa.
According to an example of the present invention, in above-mentioned cast iron, making nodularization (Nodularity) rate of the graphite being formed by above-mentioned carbon is 5～20%.
With reference to Fig. 4, illustrate this according to the manufacturing processed of cast iron of the present invention.
According to the manufacture method of cast iron of the present invention, first, in smelting furnace (100), following cast iron materials is carried out to melting, manufacture metal (110) stoste, the manganese (Mn) of the carbon (C) that described cast iron materials comprises 3.65 % by weight～3.75 % by weight with respect to all wts, the silicon (Si) of 2.0 % by weight～2.25 % by weight, 0.3 % by weight～0.6 % by weight, be greater than 0 % by weight and the phosphorus below 0.04 % by weight (P), be greater than the iron (Fe) of 0 % by weight and the sulphur below 0.02 % by weight (S) and residual content.
At the container of the cast iron stoste for the above-mentioned smelting furnace melting of splendid attire, i.e. pit-iron ladle (200; Ladle) in, put into remaining component (210), the i.e. tin (Sn) of the copper of 1.2 % by weight～1.4 % by weight (Cu), 0.07 % by weight～0.10 % by weight and the magnesium (Mg) of 0.008 % by weight～0.018 % by weight, prepare pit-iron ladle (200).
Pit-iron ladle (200) by the metal stoste splendid attire of above-mentioned manufacture to above-mentioned copper (Cu), the tin (Sn) of 0.07 % by weight～0.10 % by weight and the magnesium (Mg) of 0.008 % by weight～0.018 % by weight of putting into 1.2 % by weight～1.4 % by weight, manufactures metal (110);
According to an example of the present invention, can regulate above-mentioned splendid attire temperature, to be 1520 ± 10 DEG C.
On the other hand, according to an example of the present invention, can regulate carbon equivalent in above-mentioned cast iron stoste (CE:Carbon Equivalent), to be 4.35～4.5.
Grasp the Mg content comprising in the above-mentioned metal being contained in pit-iron ladle (200), determine the magnesium amount that will increase.
Herein, cast iron stoste is owing to transferring in the pit-iron ladle that originally contains magnesium, the magnesium that therefore comprises predetermined content in the cast iron that is contained in the melting in pit-iron ladle.However, the loss of the magnesium when considering to transfer to pit-iron ladle and more critically control the content of magnesium, rests in the Mg content comprising in the molten cast iron being contained in above-mentioned pit-iron ladle again, need to increase magnesium if be judged as, and again increases magnesium.
According to an example of the present invention, in order to grasp above-mentioned Mg content, can use thermal analyzer (300).
The magnesium of the above-mentioned determined amount that will increase is added in the metal being contained in above-mentioned pit-iron ladle.According to an example of the present invention, can utilize thread magnesium (500) to add magnesium.
Now, except magnesium, can further be added on normally used other nucleating agents in cast iron manufacturing processed.For example, can further add silicon is nucleating agent.Above-mentioned silicon is that nucleating agent can be bought commercially available prod and uses.Those skilled in the art can be as required easily kind and the content of selected and definite nucleating agent.Above-mentioned other nucleating agents can be also thread (500).
Then, the liquation that is added with above-mentioned magnesium is injected in mould (400) and completes cast iron.
< embodiment 1-10 and comparative example 1-10>
According to the composition of following table 1, manufacture the cast iron of embodiment 1-10 and comparative example 1-10.
Table 1
Unit: % by weight
| Distinguish | C | Si | Mn | Cu | Sn | Mg | P | S | Fe |
| Embodiment 1 | 3.650 | 2.240 | 0.440 | 1.360 | 0.090 | 0.017 | 0.031 | Trace | Residual content |
| Embodiment 2 | 3.680 | 2.190 | 0.400 | 1.340 | 0.090 | 0.010 | 0.031 | Trace | Residual content |
| Embodiment 3 | 3.700 | 2.110 | 0.390 | 1.410 | 0.080 | 0.011 | 0.031 | Trace | Residual content |
| Embodiment 4 | 3.710 | 2.080 | 0.400 | 1.330 | 0.100 | 0.009 | 0.034 | Trace | Residual content |
| Embodiment 5 | 3.680 | 2.140 | 0.380 | 1.260 | 0.080 | 0.011 | 0.031 | Trace | Residual content |
| Embodiment 6 | 3.680 | 2.180 | 0.430 | 1.340 | 0.090 | 0.018 | 0.026 | Trace | Residual content |
| Embodiment 7 | 3.710 | 2.130 | 0.400 | 1.290 | 0.070 | 0.013 | 0.031 | Trace | Residual content |
| Embodiment 8 | 3.690 | 2.050 | 0.400 | 1.350 | 0.100 | 0.014 | 0.033 | Trace | Residual content |
| Embodiment 9 | 3.710 | 2.130 | 0.400 | 1.290 | 0.070 | 0.013 | 0.031 | Trace | Residual content |
| Embodiment 10 | 3.700 | 2.140 | 0.430 | 1.320 | 0.090 | 0.017 | 0.030 | Trace | Residual content |
| Comparative example 1 | 3.810 | 2.220 | 0.110 | 1.150 | 0.090 | 0.012 | 0.034 | Trace | Residual content |
| Comparative example 2 | 3.710 | 2.090 | 0.290 | 0.820 | 0.070 | 0.008 | 0.024 | Trace | Residual content |
| Comparative example 3 | 3.780 | 1.970 | 0.110 | 0.870 | 0.070 | 0.000 | 0.019 | Trace | Residual content |
| Comparative example 4 | 3.690 | 2.220 | 0.080 | 1.100 | 0.120 | 0.011 | 0.036 | Trace | Residual content |
| Comparative example 5 | 3.780 | 2.010 | 0.110 | 0.890 | 0.070 | 0.000 | 0.018 | Trace | Residual content |
| Comparative example 6 | 3.620 | 2.230 | 0.480 | 1.650 | 0.090 | 0.020 | 0.028 | Trace | Residual content |
| Comparative example 7 | 3.720 | 2.090 | 0.460 | 1.390 | 0.090 | 0.022 | 0.029 | Trace | Residual content |
| Comparative example 8 | 3.710 | 2.090 | 0.430 | 1.430 | 0.100 | 0.024 | 0.025 | Trace | Residual content |
| Comparative example 9 | 3.650 | 2.190 | 0.370 | 1.230 | 0.090 | 0.020 | 0.031 | Trace | Residual content |
| Comparative example 10 | 3.690 | 2.370 | 0.290 | 0.810 | 0.070 | 0.017 | 0.023 | Trace | Residual content |
First,, according to the composition of upper table 1, prepare the stoste that contains carbon (C), silicon (Si), manganese (Mn), phosphorus (P).Sulphur (S) is that the manufacture raw material of cast iron and its are the elements inevitably comprising in manufacturing processed, does not therefore need other interpolation, is below 0.02 % by weight but make its content.
Before splendid attire, utilize CE meter (carbon equivalent meter), measure carbon equivalent (CE), regulate the content of carbon, taking TL (liquidus temperature) as benchmark, be adjusted to 1,146 ± 1 DEG C, thereby prepare stoste.
Add magnesium (Mg), copper (Cu) and tin (Sn), prepare pit-iron ladle, make splendid attire temperature homogeneous be maintained at about consistently 1,520 DEG C of left and right on one side, one side by above-mentioned stoste splendid attire in pit-iron ladle.
The stoste of above-mentioned splendid attire is carried out to heat analysis, consider the content of the magnesium that finally will comprise, determine the amount of the magnesium that will increase, regulate after alloying constituent for silk (wire) shape magnesium, at 10 ± 10 DEG C of Isosorbide-5-Nitraes, inject in mould.
Carbon equivalent (C.E.), tensile strength (TS), yield strength (YS), hardness (Hardness) and the nodularization rate (nodularity) of measuring the cast iron of manufacturing according to the composition of above-mentioned table 1, be shown in table 2.Herein, hardness is Brinell hardness, is HBW Brinell hardness number.
Table 2
As from the foregoing, the tensile strength of cast iron (Tensile Strength) is 500MPa～600MPa (N/mm according to an embodiment of the invention
2) scope, yield strength (Yield Strength) is 350MPa～450MPa (N/mm
2) scope, the scope that HBW Brinell hardness number is 255～280.
So, cast iron according to the present invention has stable tensile strength and yield strength and has suitable hardness, therefore can be easily for the manufacture of the cylinder body applicable to high-output power high pass filter diesel motor.
That as a reference, the relation of the nodularization rate to cast iron and Mg content is observed the results are shown in Fig. 1.As shown in Figure 1, known the in the situation that of CGI cast iron according to the present invention, nodularization rate is shown as 5%～20% scope.
Can be with reference to Fig. 2 and Fig. 3 according to the relation of the tensile strength of the nodularization rate of the CGI cast iron of above-mentioned manufacture (Tensile Strength) and yield strength (Yield Strength).As shown in Figures 2 and 3, can make tensile strength and yield strength respectively the cast iron within the scope of 500MPa～600MPa and 350MPa～450Mpa there is good quality.
Claims (3)
1. one kind is applicable to the CGI cast iron of the cylinder body of the diesel motor of high-output power, its carbon that comprises 3.65 % by weight～3.75 % by weight with respect to all wts (C), the silicon (Si) of 2.0 % by weight～2.25 % by weight, the manganese (Mn) of 0.3 % by weight～0.6 % by weight, the copper (Cu) of 1.2 % by weight～1.4 % by weight, the tin (Sn) of 0.07 % by weight～0.10 % by weight, the magnesium (Mg) of 0.008 % by weight～0.018 % by weight, phosphorus (P) below 0.04 % by weight, sulphur (S) below 0.02 % by weight and the iron (Fe) of residual content,
Yield strength (Yield Strength) is 350MPa～450MPa,
Nodularization (Nodularity) rate of graphite is 5%～20%.
2. the CGI cast iron of the cylinder body of the diesel motor that is applicable to high-output power according to claim 1, is characterized in that, tensile strength (Tensile Strength) is 500MPa～600MPa.
3. the CGI cast iron of the cylinder body of the diesel motor that is applicable to high-output power according to claim 1, is characterized in that, carbon equivalent (CE:Carbon Equivalent) is 4.35～4.5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2009-0128817 | 2009-12-22 | ||
| KR1020090128817A KR101605905B1 (en) | 2009-12-22 | 2009-12-22 | Cgi cast iron and preparation method thereof |
| CN201080058709.7A CN102666896B (en) | 2009-12-22 | 2010-12-08 | Cgi cast iron suitable for cylinder block of diesel engine with high output power and a production method for the same |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080058709.7A Division CN102666896B (en) | 2009-12-22 | 2010-12-08 | Cgi cast iron suitable for cylinder block of diesel engine with high output power and a production method for the same |
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| Publication Number | Publication Date |
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| CN103938067A true CN103938067A (en) | 2014-07-23 |
| CN103938067B CN103938067B (en) | 2017-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410188450.8A Active CN103938067B (en) | 2009-12-22 | 2010-12-08 | Suitable for the CGI cast irons and its manufacture method of the cylinder block of the Diesel engine of high-output power |
| CN201080058709.7A Active CN102666896B (en) | 2009-12-22 | 2010-12-08 | Cgi cast iron suitable for cylinder block of diesel engine with high output power and a production method for the same |
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Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20120301346A1 (en) |
| EP (1) | EP2518174B1 (en) |
| KR (1) | KR101605905B1 (en) |
| CN (2) | CN103938067B (en) |
| WO (1) | WO2011078500A2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9091345B2 (en) * | 2011-11-30 | 2015-07-28 | Federal-Mogul Corporation | High modulus wear resistant gray cast iron for piston ring applications |
| CN103195689A (en) * | 2013-04-24 | 2013-07-10 | 东莞市金瑞五金制品有限公司 | Compressor |
| KR102279874B1 (en) * | 2014-12-24 | 2021-07-20 | 두산인프라코어 주식회사 | Nodular graphite cast iron and preparation method thereof, and component for hydraulic device prepared thereby |
| KR102388131B1 (en) * | 2015-02-04 | 2022-04-19 | 현대두산인프라코어(주) | Compacted graphite cast iron and engine component comprising the same |
| WO2018079887A1 (en) * | 2016-10-28 | 2018-05-03 | 한국생산기술연구원 | Flake graphite cast iron and casting and production method thereof |
| CN112322962B (en) * | 2020-11-06 | 2022-04-12 | 中原内配集团股份有限公司 | Vermicular graphite cast iron and preparation method thereof |
| CN114836680A (en) * | 2021-02-01 | 2022-08-02 | 上海海立电器有限公司 | Casting material, compressor cylinder and casting method thereof, and rotor type compressor |
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| CN1059939A (en) * | 1990-09-19 | 1992-04-01 | 株式会社日立制作所 | The elevator pulley of fine and close vermicular iron and manufacturing thereof |
| JP2000038639A (en) * | 1998-07-24 | 2000-02-08 | Nissan Diesel Motor Co Ltd | Compact vermicular graphite cast iron for engine case |
| JP2002519518A (en) * | 1998-07-03 | 2002-07-02 | シンター カスト エービー | CV graphite cast iron alloy, its production method and its use |
| JP2003514993A (en) * | 1999-11-23 | 2003-04-22 | シンター カスト エービー | New cast iron alloys and products |
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| US2690392A (en) * | 1947-03-22 | 1954-09-28 | Int Nickel Co | Process for producing improved cast iron |
| US2943932A (en) * | 1957-06-10 | 1960-07-05 | Gen Motors Corp | Boron-containing ferrous metal having as-cast compacted graphite |
| US4164148A (en) * | 1978-05-01 | 1979-08-14 | Laforet Henry A | Method for determining sulfur content of cast iron |
| SE502227C2 (en) * | 1993-12-30 | 1995-09-18 | Sintercast Ab | Process for the continuous provision of pretreated molten iron for casting compact graphite iron articles |
| JP2894300B2 (en) * | 1996-11-15 | 1999-05-24 | 株式会社日立製作所 | Compact vermicular graphite cast iron |
| US20030024608A1 (en) * | 1997-10-14 | 2003-02-06 | Camcast Industries Pty., Ltd. | Iron alloy containing molybdenum |
| BR0105987B1 (en) * | 2001-11-27 | 2009-08-11 | high machinable vermicular cast iron. | |
| KR20030087484A (en) * | 2002-05-10 | 2003-11-14 | 현대자동차주식회사 | A composition of compacted graphite iron ferrite |
| KR100836399B1 (en) * | 2006-11-13 | 2008-06-09 | 현대자동차주식회사 | method for manufacturing CGI Cast Iron |
| KR20090093291A (en) * | 2008-02-29 | 2009-09-02 | 현대자동차주식회사 | CGI Cast Iron |
-
2009
- 2009-12-22 KR KR1020090128817A patent/KR101605905B1/en active IP Right Grant
-
2010
- 2010-12-08 CN CN201410188450.8A patent/CN103938067B/en active Active
- 2010-12-08 US US13/518,516 patent/US20120301346A1/en not_active Abandoned
- 2010-12-08 CN CN201080058709.7A patent/CN102666896B/en active Active
- 2010-12-08 WO PCT/KR2010/008730 patent/WO2011078500A2/en active Application Filing
- 2010-12-08 EP EP10839697.9A patent/EP2518174B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059939A (en) * | 1990-09-19 | 1992-04-01 | 株式会社日立制作所 | The elevator pulley of fine and close vermicular iron and manufacturing thereof |
| JP2002519518A (en) * | 1998-07-03 | 2002-07-02 | シンター カスト エービー | CV graphite cast iron alloy, its production method and its use |
| JP2000038639A (en) * | 1998-07-24 | 2000-02-08 | Nissan Diesel Motor Co Ltd | Compact vermicular graphite cast iron for engine case |
| JP2003514993A (en) * | 1999-11-23 | 2003-04-22 | シンター カスト エービー | New cast iron alloys and products |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2518174A4 (en) | 2014-05-07 |
| WO2011078500A3 (en) | 2011-11-10 |
| CN102666896B (en) | 2014-10-29 |
| CN102666896A (en) | 2012-09-12 |
| WO2011078500A2 (en) | 2011-06-30 |
| EP2518174B1 (en) | 2015-07-22 |
| KR101605905B1 (en) | 2016-03-23 |
| KR20110072048A (en) | 2011-06-29 |
| EP2518174A2 (en) | 2012-10-31 |
| CN103938067B (en) | 2017-07-28 |
| US20120301346A1 (en) | 2012-11-29 |
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