CN111334705A - High-strength pearlite antifriction cast iron and preparation method and application thereof - Google Patents
High-strength pearlite antifriction cast iron and preparation method and application thereof Download PDFInfo
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- CN111334705A CN111334705A CN202010265183.5A CN202010265183A CN111334705A CN 111334705 A CN111334705 A CN 111334705A CN 202010265183 A CN202010265183 A CN 202010265183A CN 111334705 A CN111334705 A CN 111334705A
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 39
- 229910001562 pearlite Inorganic materials 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 238000003754 machining Methods 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 229910001563 bainite Inorganic materials 0.000 abstract description 8
- 229910052759 nickel Inorganic materials 0.000 abstract description 8
- 229910001060 Gray iron Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000010955 niobium Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 13
- 239000011572 manganese Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 9
- 239000010949 copper Substances 0.000 description 8
- 239000002054 inoculum Substances 0.000 description 8
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 5
- OOJQNBIDYDPHHE-UHFFFAOYSA-N barium silicon Chemical compound [Si].[Ba] OOJQNBIDYDPHHE-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000011081 inoculation Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007546 Brinell hardness test Methods 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000001636 atomic emission spectroscopy Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004154 testing of material Methods 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention provides alloy cast iron, which comprises the following components: 2.6-3.2% of C; 0.02-0.1% S; 1.5-2.6% of Si; 0.2-0.5% of P; 0.5 to 1.0% of Mn; 0.0-0.4% Cr; 0.1-0.8% of Cu; 0.1-0.7% of Mo; 0.1-0.7% Ni; 0.05-0.4% of Nb; the balance being Fe. The cylinder sleeve blank is obtained through centrifugal casting, the tensile strength of the cylinder sleeve blank is stable and reaches more than 400MPa, the hardness of the cylinder sleeve blank can reach 270-330 HBW, the mechanical property of the cylinder sleeve blank is equivalent to that of alloy bainite gray cast iron, but the cylinder sleeve blank is simple in production process, low in cost, good in wear resistance and high in use value and economic value. The invention also provides a preparation method and application of the high-strength pearlite antifriction cast iron.
Description
Technical Field
The invention relates to the technical field of cast iron, in particular to high-strength pearlite antifriction cast iron and a preparation method and application thereof.
Background
The cylinder sleeve is a cylindrical workpiece and is positioned in a cylinder body hole of the machine body, the upper part of the cylinder sleeve is tightly pressed and fixed by a cylinder cover, the piston does reciprocating motion in an inner hole of the piston, and cooling water is arranged outside the piston; it, cylinder cover and piston together form the working space of cylinder. The cylinder liner is one of key parts of an engine and requires high mechanical performance. For example, at present, the high-strength cylinder liner mostly adopts an alloyed as-cast bainite gray cast iron cylinder liner, and the chemical composition of the cylinder liner is as follows by weight percent: carbon: 2.7-3.1%; silicon: 1.3-2.2%; manganese: 0.4-8%; phosphorus is less than or equal to 0.1 percent; sulfur is less than or equal to 0.1 percent; copper: 0.3-1.0%; molybdenum: 1.0-1.5%; nickel: 1.0-1.5%; the balance being Fe; the strength of the bainite material can reach more than 400MPa, but the bainite material uses more precious alloys and has higher cost, and the wear resistance and the corrosion resistance can not meet the requirements of more than six machine types in China.
Disclosure of Invention
In view of the above, the present invention aims to provide a high-strength pearlite antifriction cast iron, a preparation method and an application thereof, and the pearlite cast iron provided by the present invention has the advantages of high strength, high wear resistance, corrosion resistance, low friction coefficient and low manufacturing cost.
The invention provides high-strength pearlite antifriction cast iron which comprises the following components:
2.6-3.2 wt% of C;
0.02 to 0.1 wt% S;
1.5-2.6 wt% of Si;
0.2 to 0.5 wt% of P;
0.5 to 1.0 wt% Mn;
0.0 to 0.4 wt% of Cr;
0.1 to 0.8 wt% of Cu;
0.1 to 0.7 wt% of Mo;
0.1 to 0.7 wt% of Ni;
0.05 to 0.4 wt% of Nb;
the balance being Fe.
In the present invention, the high-strength pearlitic antifriction cast iron preferably has the following composition:
2.8-3.0 wt% of C;
0.04 to 0.0.6 wt% S;
1.8-2.2 wt% of Si;
0.25 to 0.5 wt% of P;
0.6-0.8 wt% Mn;
0.15 to 0.25 wt% of Cr;
0.3 to 0.6 wt% of Cu;
0.3 to 0.5 wt% of Mo;
0.3 to 0.5 wt% of Ni;
0.15 to 0.25 wt% of Nb;
the balance being Fe.
In the invention, the mass content of C is preferably 2.8-3.0%; the mass content of S is preferably 0.04-0.06%; the mass content of the Si is preferably 1.8-2.2%; the mass content of P is preferably 0.25-0.5%, and more preferably 0.3-0.4%; the mass content of Mn is preferably 0.6-0.8%; the mass content of Cr is preferably 0.15-0.25%; the mass content of Cu is preferably 0.3-0.6%, and more preferably 0.4-0.5%; the mass content of Mo is preferably 0.3-0.5%, and more preferably 0.4%; the mass content of the Ni is preferably 0.3-0.5%, and more preferably 0.4%; the mass content of Nb is preferably 0.15 to 0.25%, more preferably 0.2%.
The addition of the alloy elements such as molybdenum, nickel, niobium and the like can obtain the optimal pearlite structure, refine graphite and strengthen a matrix. The invention obtains the best cast iron performance mainly by matching and combining various elements, such as a proper amount of P element content, and is mainly used for forming the intermittent reticular phosphorus eutectic crystal to improve the wear resistance and the antifriction property of the cylinder sleeve, and the content is too low, the wear resistance and the antifriction effect are deteriorated and too high, and the cast iron brittleness is increased; adding a proper amount of manganese and chromium to adjust the macroscopic hardness of the cast iron; the addition of Mo, Ni and Nb can raise the strength, elastic modulus and fatigue strength of cast iron, and Nb has strong solid solution strengthening and dispersion strengthening action on the cast iron matrix, and the Nb (C, N) phase formed by Nb element has very high microhardness, so that the wear resistance of cast iron can be further raised.
The invention provides a preparation method of high-strength pearlite antifriction cast iron in the technical scheme, which comprises the following steps:
inoculating the alloy raw material after smelting to obtain molten iron;
carrying out centrifugal casting on the molten iron to obtain a blank;
and cooling, rough machining, stress relief annealing and finish machining are carried out on the blank to obtain the high-strength pearlite antifriction cast iron cylinder sleeve.
The alloy raw materials are not particularly limited, and those skilled in the art can adopt simple substances or alloys containing relevant alloy elements according to the required cast iron components.
In the invention, the smelting temperature is preferably 1500-1540 ℃, more preferably 1510-1530 ℃ and most preferably 1520 ℃.
The inoculation is not particularly limited in the present invention and may be carried out by a cast iron inoculation method well known to those skilled in the art, and the inoculant used in the inoculation is preferably a silicon-barium inoculant which is commercially available.
In the invention, the components of the molten iron are consistent with the components of the high-strength pearlite antifriction cast iron in the technical scheme, and the components are as follows: 2.6-3.2 wt% of C; 0.02 to 0.1 wt% S; 1.5-2.6 wt% of Si; 0.2 to 0.5 wt% of P; 0.5 to 1.0 wt% Mn; 0.0 to 0.4 wt% of Cr; 0.1 to 0.7 wt% of Mo; 0.1 to 0.7 wt% of Ni; 0.05-0.4% of Nb; the balance being Fe.
In the invention, the centrifugal casting temperature is preferably 1400-1440 ℃, more preferably 1410-1430 ℃, and most preferably 1420 ℃. In the invention, the rotation speed of centrifugal casting is preferably 1350-1400 r/min, and more preferably 1360-1370 r/min. In the invention, the centrifugal casting mold-releasing temperature is preferably 800-900 ℃, more preferably 820-880 ℃, and most preferably 840-860 ℃.
In the invention, the cooling is preferably carried out by air cooling after the compressed air is treated to the temperature of 550-650 ℃, more preferably 580-620 ℃, and most preferably 600 ℃. In the present invention, the cooling rate during the cooling process is preferably > 70 ℃/min.
The method of rough machining is not particularly limited in the present invention, and the cylinder liner having a desired shape may be obtained by rough machining methods well known to those skilled in the art.
In the invention, the temperature of the stress relief annealing is preferably 530-570 ℃, more preferably 540-560 ℃, and most preferably 550 ℃; the time of the stress relief annealing is preferably 2-3 hours.
The method for finishing is not particularly limited in the present invention, and the cylinder liner with the required dimensional accuracy can be obtained by adopting a finishing method well known to those skilled in the art.
The cast iron provided by the invention is easy to produce, qualified castings can be produced only by adopting the most common casting process, the casting process is far lower than the casting difficulty of as-cast bainite gray cast iron, and although the cast iron contains a small amount of precious metals, the content of the cast iron is much lower than that of the bainite gray cast iron, so the material cost is also greatly reduced.
The invention provides a cylinder liner, which is made of the high-strength pearlite antifriction cast iron in the technical scheme, and the preparation method of the cylinder liner is consistent with that of the high-strength pearlite antifriction cast iron in the technical scheme, and is not repeated herein.
The tensile strength of the cast iron provided by the invention reaches more than 450MPa, the cast iron is far higher than the highest mark HT350 (tensile strength is not lower than 350MPa) of gray cast iron, and the fatigue strength even reaches more than 200 MPa.
Compared with the prior art, the strength of the cast iron is greatly improved by optimally designing alloy components and a casting process, the cost is relatively low, the process is simple, the hardness is 270-330 HB, the tensile strength is greater than 400MPa, the cast iron matrix is fine flake pearlite, the structure is stable, and the stability of the size, namely form and position tolerance, of the cylinder sleeve is easily ensured; because the matrix structure has the mesh-shaped distribution of the phosphorus eutectic crystal and the microhardness of the Nb (C, N) phase can reach 2500-3000 HV, the wear resistance of the cylinder sleeve is greatly improved. The cast iron of the invention has relatively low alloy content, so the comprehensive cost is far lower than that of high-alloy bainite alloy cast iron.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
Example 1
Inoculating alloy elements after smelting to obtain molten iron, wherein the smelting temperature is controlled to be 1500-1520 ℃; the inoculant adopted during inoculation is a silicon-barium inoculant for Ningxia casting peak.
And centrifugally casting the obtained molten iron into a blank, controlling the casting temperature to be 1400-1420 ℃, controlling the centrifugal rotating speed to be 1360r/min in the casting process, and discharging at 850 ℃.
And cooling the obtained blank to 600 ℃ by compressed air, and then cooling by air, wherein the cooling speed in the cooling period is more than 70 ℃/min.
And (3) after rough machining, preserving the heat of the cooled blank at 550 ℃ for 3 hours, and finishing to obtain a finished cylinder sleeve product.
Detecting the components of the cylinder sleeve by adopting a photoelectric direct-reading spectrometer according to GB/T24234-2009 'cast iron multi-element determination spark discharge atomic emission spectrometry', wherein the detection result is that the cylinder sleeve comprises the following components:
c: 2.85 wt%, Si: 2.01 wt%, P: 0.28 wt%, S: 0.05 wt%, Mn: 0.65 wt%, Cr: 0.15 wt%, Cu: 0.45 wt%, Ni: 0.35 wt%, Mo: 0.4 wt%, Nb: 0.19 wt%, the balance being Fe.
The cylinder liner prepared in example 1 is subjected to mechanical property detection according to GB/T231.1-2018 part 1 of Brinell hardness test of metal material: the standard test of the test method comprises the following test results: HBW: 285; adopting a universal material testing machine WDW-300, and according to GB/T228.1-2010 part 1 of metal material tensile test: the standard test of the room temperature test method indicates that the tensile strength is as follows: 456 MPa; according to the standard detection of GB/T22315-2008 ' test method for elastic modulus and Poisson's ratio of metal material ', the detection result is that the elastic modulus of the cylinder sleeve prepared in the embodiment 1 of the invention is as follows: 146 GPa.
Example 2
Inoculating the alloy raw material after smelting to obtain molten iron; controlling the smelting temperature to be 1520-1540 ℃; the inoculant is silicon-barium inoculant of Ningxia casting peak.
Centrifugally casting the obtained molten iron into a blank, wherein the casting temperature is controlled to be 1420-1440 ℃, and the centrifugal rotating speed is 1360 r/min; and (4) demolding at 850 ℃.
Cooling the obtained blank to 580 ℃ by compressed air, and then cooling by air, wherein the cooling speed is more than 70 ℃/min during cooling.
And (4) roughly processing the cooled blank, preserving the heat at 550 ℃ for 3 hours, and finely processing the blank into a finished cylinder sleeve product.
According to the method of the embodiment 1, the components of the cylinder sleeve prepared in the embodiment 2 of the invention are detected, and the detection result is as follows:
c: 2.72 wt%, Si: 2.11 wt%, P: 0.32 wt%, S: 0.05 wt%, Mn: 0.71 wt%, Cr: 0.11 wt%, Cu: 0.35 wt%, Ni: 0.30 wt%, Mo: 0.37 wt%, Nb: 0.15 wt%, the balance being Fe.
According to the detection method of the embodiment 1, the mechanical property of the cylinder sleeve prepared in the embodiment 2 of the invention is detected, and the detection result is as follows: HBW: 310, tensile strength: 462MPa, modulus of elasticity: 151 GPa.
Example 3
Inoculating the alloy raw material after smelting to obtain molten iron; controlling the smelting temperature to be 1490-1510 ℃; the inoculant is silicon-barium inoculant of Ningxia casting peak.
Centrifugally casting the obtained molten iron into a blank, wherein the casting temperature is controlled to be 1400-1420 ℃, and the centrifugal rotating speed is 1360 r/min; and (4) demolding at 850 ℃.
Cooling the obtained blank to 610 ℃ by compressed air, and then cooling by air, wherein the cooling speed is more than 70 ℃/min during cooling.
And (4) roughly processing the cooled blank, preserving the heat at 550 ℃ for 3 hours, and finely processing the blank into a finished cylinder sleeve product.
According to the method of the embodiment 1, the components of the cylinder sleeve prepared in the embodiment 3 of the invention are detected, and the detection result is as follows:
c: 2.98 wt%, Si: 1.81 wt%, P: 0.3 wt%, S: 0.045 wt%, Mn: 0.53 wt%, Cr: 0.19 wt%, Cu: 0.35 wt%, Ni: 0.30 wt%, Mo: 0.3 wt%, Nb: 0.23 wt%, the balance being Fe.
According to the method of the embodiment 1, the mechanical property of the cylinder sleeve prepared in the embodiment 3 of the invention is detected, and the detection result is as follows: HBW279, tensile strength: 442MPa, modulus of elasticity: 144 GPa.
From the above examples, the invention provides a high strength pearlitic antifriction cast iron comprising the following components: 2.6-3.2% of C; 0.02-0.1% S; 1.5-2.6% of Si; 0.2-0.5% of P; 0.5 to 1.0% of Mn; 0.0-0.4% Cr; 0.1-0.8% of Cu; 0.1-0.7% of Mo; 0.1-0.7% Ni; 0.05-0.4% of Nb; the balance being Fe. The cylinder sleeve blank is obtained through centrifugal casting, the tensile strength of the cylinder sleeve blank is stable and reaches more than 400MPa, the hardness of the cylinder sleeve blank can reach 270-330 HBW, the mechanical property of the cylinder sleeve blank is equivalent to that of alloy bainite gray cast iron, but the cylinder sleeve blank is simple in production process, low in cost, good in wear resistance and high in use value and economic value.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A high-strength pearlite antifriction cast iron comprises the following components:
2.6-3.2 wt% of C;
0.02 to 0.1 wt% S;
1.5-2.6 wt% of Si;
0.2 to 0.5 wt% of P;
0.5 to 1.0 wt% Mn;
0.0 to 0.4 wt% of Cr;
0.1 to 0.8 wt% of Cu;
0.1 to 0.7 wt% of Mo;
0.1 to 0.7 wt% of Ni;
0.05 to 0.4 wt% of Nb;
the balance being Fe.
2. The high strength pearlitic friction reducing cast iron according to claim 1 having the composition:
2.8-3.0 wt% of C;
0.04 to 0.0.6 wt% S;
1.8-2.2 wt% of Si;
0.25 to 0.5 wt% of P;
0.6-0.8 wt% Mn;
0.15 to 0.25 wt% of Cr;
0.3 to 0.6 wt% of Cu;
0.3 to 0.5 wt% of Mo;
0.3 to 0.5 wt% of Ni;
0.15 to 0.25 wt% of Nb;
the balance being Fe.
3. A method for preparing the high strength pearlitic wear reduced cast iron of claim 1 comprising:
inoculating the alloy raw material after smelting to obtain molten iron;
carrying out centrifugal casting on the molten iron to obtain a blank;
and cooling, rough machining, stress relief annealing and finish machining are carried out on the blank to obtain the high-strength pearlite antifriction cast iron.
4. The method of claim 3, wherein the temperature of the smelting is 1500-1540 ℃.
5. The method of claim 3, wherein the temperature of the centrifugal casting is 1400-1440 ℃.
6. The method according to claim 3, wherein the rotational speed of the centrifugal casting is 1350-1400 r/min.
7. The method according to claim 3, wherein the centrifugal casting has a casting temperature of 800-900 ℃.
8. The method according to claim 1, wherein the temperature of the cooling is 550 to 650 ℃.
9. The method of claim 1, wherein the stress relief annealing temperature is 530-570 ℃; and the heat preservation time of the stress relief annealing is 2-3 hours.
10. A cylinder liner, the material of the cylinder liner is the high-strength pearlite antifriction cast iron of claim 1.
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Cited By (4)
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| CN111690867A (en) * | 2020-07-08 | 2020-09-22 | 中原内配集团股份有限公司 | Alloy cast iron and preparation method thereof |
| CN115491579A (en) * | 2022-09-28 | 2022-12-20 | 江苏力源金河铸造有限公司 | High-precision hydraulic electromagnetic valve casting and casting process design thereof |
| CN115725891A (en) * | 2021-08-31 | 2023-03-03 | 通用汽车环球科技运作有限责任公司 | High modulus, high strength and low alloy gray cast iron for cylinder liners and automotive applications |
| CN116179933A (en) * | 2023-02-21 | 2023-05-30 | 安庆帝伯格茨缸套有限公司 | A kind of high-strength pearlitic diesel engine cylinder liner material and preparation method thereof |
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| JPH11286738A (en) * | 1998-04-06 | 1999-10-19 | Kubota Corp | High-speed cast iron with graphite and iron phosphide |
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| CN111690867A (en) * | 2020-07-08 | 2020-09-22 | 中原内配集团股份有限公司 | Alloy cast iron and preparation method thereof |
| CN111690867B (en) * | 2020-07-08 | 2021-12-07 | 中原内配集团股份有限公司 | Alloy cast iron and preparation method thereof |
| CN115725891A (en) * | 2021-08-31 | 2023-03-03 | 通用汽车环球科技运作有限责任公司 | High modulus, high strength and low alloy gray cast iron for cylinder liners and automotive applications |
| CN115725891B (en) * | 2021-08-31 | 2023-11-21 | 通用汽车环球科技运作有限责任公司 | High modulus, high strength and low alloy gray cast iron for cylinder liner and automotive applications |
| CN115491579A (en) * | 2022-09-28 | 2022-12-20 | 江苏力源金河铸造有限公司 | High-precision hydraulic electromagnetic valve casting and casting process design thereof |
| CN116179933A (en) * | 2023-02-21 | 2023-05-30 | 安庆帝伯格茨缸套有限公司 | A kind of high-strength pearlitic diesel engine cylinder liner material and preparation method thereof |
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