CN115612916A - Microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength and preparation method thereof - Google Patents
Microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength and preparation method thereof Download PDFInfo
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- 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
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- 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
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
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- 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
- C21D2211/006—Graphite
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0008—Ferro
- F16D2200/0013—Cast iron
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- 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
Abstract
The invention relates to microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength and a preparation method thereof, belonging to the technical field of cast iron materials. The technical problem that the heat conductivity and the tensile strength of the gray cast iron in the prior art can not be considered at the same time is solved. The high carbon ash cast iron comprises, by mass, 3.74-3.99% of C, 1.15-1.5% of Si, 0.55-0.7% of Mn, 0.07-0.1% of S, 0.25-0.5% of Cu, 0.1-0.25% of Cr, 0.07-0.09% of Sn, 0.1-0.2% of Nb, 0.16-0.22% of Mo, and the balance of Fe and inevitable impurities. The heat conductivity coefficient of the high-carbon gray cast iron reaches 77W/(m × K), the heat conductivity of the gray cast iron is greatly improved, and meanwhile, the high-carbon gray cast iron keeps good mechanical property and is mainly applied to automobile brake discs.
Description
Technical Field
The invention belongs to the technical field of cast iron materials, and particularly relates to microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength and a preparation method thereof, which are mainly applied to an automobile brake disc.
Background
Gray cast iron is cast iron in which carbon is present in the form of flake graphite, and is so named because its cross-section is gray. Gray cast iron has various advantages such as good heat conductivity, shock absorption, castability, and lower cost compared to other metal materials. These advantages make gray cast iron widely used in structural members under mechanical and thermal fatigue conditions, such as automobile brake discs.
The brake disc is an important part for ensuring the safe running of the automobile. In the use process, once a large amount of heat generated due to friction cannot be dissipated in time, a temperature difference occurs inside the brake disc, thereby generating thermal stress. When the stresses exceed the strength of the gray cast iron itself, the brake disc can crack and eventually fail. Along with the development of social economy, energy conservation and emission reduction are more and more emphasized, the light weight becomes the development trend of the automobile industry, and higher requirements are provided for the performance of the gray cast iron material for the brake disc. The common promotion of the heat conductivity and the tensile strength of the gray cast iron can become an important driving force for the development of the automobile industry.
The thermal conductivity and tensile strength of the gray cast iron material are two properties of the reciprocal detent toggle. The high thermal conductivity of gray cast iron results from the flake graphite inside it. The thermal conductivity of graphite is extremely high, and the lamellar graphite forms a heat transfer channel inside the gray cast iron, so that the higher the graphite content, the higher the thermal conductivity of the gray cast iron. However, the strength of graphite is very low, which is equivalent to a defect, so that the higher the content of graphite, the lower the tensile strength. Therefore, in order to improve the thermal conductivity and the tensile strength at the same time, it is necessary to properly add alloy elements under the premise of high carbon content, so as to improve the matrix strength as much as possible while changing the graphite form and optimizing the graphite distribution.
The prior art has the following research on the high thermal conductivity gray cast iron:
1) The Chenxiang of the Qinghua university puts forward a patent of 'high-heat-conductivity high-strength gray cast iron and a preparation method thereof', wherein, a C:3.69wt%, si:1.59wt% of gray cast iron material added with alloy elements of Mn, cu, ni, mo and Sn, and the highest heat conductivity coefficient is 61.8W/(m × K);
2) The patent 'a high-performance gray cast iron with comprehensive high thermal property and mechanical property' proposed by Dingxian Fei of Beijing aviation materials research institute of China aviation relates to a C:3.6wt%, si:1.89, and adding alloy elements of Cr, mo, mn and Cu, and the heat conductivity coefficient is 62W/(m × K) at most;
3) The patent 'a niobium-containing high-strength gray cast iron material and a preparation method thereof' proposed by jin Tong of Dongfeng commercial vehicle Co., ltd relates to a niobium-containing gray cast iron material, wherein C:3.36%, si:1.95 percent, and alloy elements of Mn, S, nb, N, sn and Cr are added, and the heat conductivity coefficient is 55W/(m × K) at most;
4) Wang in "influence of alloying elements on the thermal conductivity of pearlitic gray cast iron" has devised a gray cast iron material in which C:3.67wt%, si:1.41wt%, mn, mo and Cu are added, and the thermal conductivity is 55.7W/(m × K).
5) Ding in the text "influence of molybdenum on the as-cast structure and properties of gray cast iron" devised a gray cast iron material in which C:3.05, si:1.95 percent, and simultaneously adding Cr, mo and Mn, the final heat conductivity coefficient is 50.96W/(m × K).
The high-heat-conductivity gray cast iron materials proposed in the research are all low-C high-Si or medium-C medium-Si, the heat conductivity coefficient does not break through 70W/(m & ltk & gt), and the heat conductivity of gray cast iron still has a space for improvement.
Disclosure of Invention
The invention aims to provide microalloyed high-carbon gray cast iron with ultrahigh heat conductivity coefficient and high strength and a preparation method thereof by adjusting the contents of C and Si and adding alloy elements such as Mo, nb, S and the like. The higher carbon content in the gray cast iron is used to obtain a higher graphite content; the proper silicon content enables the graphite to be distributed in an A-type sheet shape, and simultaneously reduces the grain size; the alloy elements such as Mn, S, cr, nb, mo and the like can promote nucleation, optimize the form distribution of graphite and simultaneously improve the mechanical property of the matrix. The heat conductivity coefficient of the gray cast iron can reach 65-77W/(m × K) at room temperature, and the tensile strength is more than 220Mpa.
The technical scheme adopted by the invention for realizing the aim is as follows.
The invention provides microalloyed high carbon gray cast iron with ultrahigh heat conduction and high strength, which comprises the following chemical components in percentage by mass: 3.74 to 3.99 percent of C, 1.15 to 1.5 percent of Si, 0.55 to 0.7 percent of Mn, 0.07 to 0.1 percent of S, 0.25 to 0.5 percent of Cu, 0.1 to 0.25 percent of Cr, 0.07 to 0.09 percent of Sn, 0.1 to 0.2 percent of Nb, 0.16 to 0.22 percent of Mo, and the balance of (matrix element) Fe and inevitable impurities.
Preferably, the high-carbon gray cast iron comprises the following chemical components in percentage by mass: 3.91% of C, 1.29% of Si, 0.59% of Mn, 0.09% of S, 0.37% of Cu, 0.25% of Cr, 0.09% of Sn, 0.17% of Nb, 0.18% of Mo, and the balance of Fe as a matrix element and unavoidable impurity elements.
Preferably, the high carbon gray cast iron comprises, by mass, 3.99% of C, 1.17% of Si, 0.59% of Mn, 0.07% of S, 0.39% of Cu, 0.13% of Cr, 0.09% of Sn, 0.12% of Nb, 0.2% of Mo, and the balance of a matrix element Fe and unavoidable impurity elements.
Preferably, the high carbon gray cast iron comprises, by mass, 3.74% of C, 1.48% of Si, 0.69% of Mn, 0.1% of S, 0.25% of Cu, 0.22% of Cr, 0.08% of Sn, 0.18% of Nb, 0.2% of Mo, and the balance of a matrix element Fe and unavoidable impurity elements.
The invention also provides a preparation method of the microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength, which comprises the following steps:
1) Taking pig iron, ferrosilicon, ferromanganese, ferrochrome, ferromanganese, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant as raw materials, and weighing the raw materials according to the element composition of high-carbon gray cast iron to be prepared;
2) Smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant;
3) After furnace burden is melted down, scum is removed, molten iron is discharged out of the furnace, and in-ladle inoculation treatment is carried out;
4) Pouring the molten iron in the ladle into a sand mold, air-cooling to room temperature, and taking out to obtain the microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength.
Further, in the step 2), the smelting equipment is a medium frequency induction furnace.
Further, in the step 3), the tapping temperature of the molten iron is 1520 ℃ to 1550 ℃.
Further, in the step 3), the inoculant adopted at the inoculation position in the ladle is 75SiFe, and the addition amount of the inoculant is 0.7 percent of the mass percentage of the molten iron.
Further, in the step 4), the casting temperature is 1330-1350 ℃.
Further, in the step 4), the molding sand is furan resin sand.
The principle of the invention is as follows: the microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength uses a material of high carbon and low silicon, greatly increases the content of C, properly reduces the content of Si, increases the content of graphite, and reduces the grain size of the graphite, thereby enabling flake graphite to be denser; properly adding S, and increasing graphite cores through the formation of MnS, so as to improve the graphite content; meanwhile, on the basis of C, si, mn, cu, cr and Sn, mo and Nb elements are added, eutectic groups are refined, graphite is bent, and connectivity among the graphite is stronger; the S content is limited, and finally, on the premise of ensuring that the mechanical property reaches the standard, the heat conductivity coefficient reaches 77W/(m × K), so that the heat conductivity of the gray cast iron is greatly improved.
Compared with the prior art, the invention has the following beneficial effects:
the microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength is a gray cast iron material with more than 98 percent of fine flake graphite uniformly distributed on a pearlite matrix, the heat conductivity coefficient reaches 77W/(m × K), the heat conductivity of the gray cast iron is greatly improved, and good mechanical properties are kept, so that the thermal fatigue resistance of the gray cast iron is obviously improved, the service life of a brake disc is prolonged, the loss of the cast iron material is reduced, and the safety of automobile driving is improved and the economic loss is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows a graphite structure of microalloyed high carbon gray cast iron having ultra-high thermal conductivity and high strength according to example 1 of the present invention.
FIG. 2 shows the matrix structure of microalloyed high carbon gray cast iron with ultrahigh thermal conductivity and high strength in example 1 of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention, but it is to be understood that the description is intended to illustrate further features and advantages of the invention, and not to limit the scope of the claims.
The microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength comprises the following chemical components in percentage by mass: 3.74 to 3.99 percent of C, 1.15 to 1.5 percent of Si, 0.55 to 0.7 percent of Mn, 0.07 to 0.1 percent of S, 0.25 to 0.5 percent of Cu, 0.1 to 0.25 percent of Cr, 0.07 to 0.09 percent of Sn, 0.1 to 0.2 percent of Nb, 0.16 to 0.22 percent of Mo, and the balance of matrix element Fe and inevitable impurities.
The invention provides several preferable chemical compositions of microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength, but is not limited to the chemical compositions, namely the preferable high-carbon gray cast iron comprises the following chemical components in percentage by mass: 3.91% of C, 1.29% of Si, 0.59% of Mn, 0.09% of S, 0.37% of Cu, 0.25% of Cr, 0.09% of Sn, 0.17% of Nb, 0.18% of Mo, and the balance of Fe as a matrix element and inevitable impurity elements;
or 3.99% of C, 1.17% of Si, 0.59% of Mn, 0.07% of S, 0.39% of Cu, 0.13% of Cr, 0.09% of Sn, 0.12% of Nb, 0.2% of Mo, and the balance of Fe as a matrix element and inevitable impurity elements.
Or 3.74 percent of C, 1.48 percent of Si, 0.69 percent of Mn, 0.1 percent of S, 0.25 percent of Cu, 0.22 percent of Cr, 0.08 percent of Sn, 0.18 percent of Nb, 0.2 percent of Mo, and the balance of matrix element Fe and inevitable impurity elements.
The function of each alloy element in the invention is as follows:
c: c is gray cast iron graphitizing element. The C content of the invention ranges from 3.74wt% to 3.99wt%, and belongs to the high carbon range. Increasing the C content increases the graphite content in the gray cast iron structure, thereby increasing the thermal conductivity of the material.
Si: si is a graphite stabilizing element and can promote the formation of C in the form of graphite, and therefore Si is an important element in gray cast iron. However, too high a Si content leads to too large gray cast iron grains, which in turn reduces the mechanical properties. The content of Si in the invention is 1.15-1.5%, and the Si belongs to the low-silicon range.
Mn and S: since the S element can form FeS with a low melting point in the structure, cast iron properties are deteriorated. Therefore, in the past, S was generally considered as an impurity element in gray cast iron. However, mn can bind to S to produce MnS, and suppress the production of a harmful substance FeS. Meanwhile, mnS can be used as the core of graphite nucleation to promote nucleation, thereby improving the inoculation effect and refining eutectic clusters. Therefore, the performance of the gray cast iron can be effectively improved by adding a certain content of Mn and S. The content of Mn in the invention is controlled to be 0.55wt% -0.7 wt%, and the content of S is limited to be 0.07wt% -0.1 wt%, so that the best effect is achieved.
Cu: the Cu element can effectively promote the formation of pearlite, and the interlayer spacing of the pearlite is more compact while the content of the pearlite is increased; the graphite flake is also finer in size after a certain amount of Cu is added. The combined action of the graphite and the matrix enables the Cu to have the effect of improving the mechanical property of the gray cast iron. The content of Cu in the invention is 0.25wt% -0.5 wt%.
Cr: cr also has the functions of promoting and refining pearlite, and has a remarkable effect of improving the mechanical property. However, cr has a strong affinity for C, and excessive Cr rapidly increases free carbides in the matrix structure, so that the Cr content is controlled. The content of Cr in the invention is 0.1wt% -0.25 wt%.
Sn: sn has a lower melting point (231.89 ℃) than other alloy components in gray cast iron, and this makes Sn the last component to solidify in the solidification process of cast iron, so Sn segregates in austenite, inhibits the growth of graphite, and promotes the growth of pearlite. The addition of a certain amount of Sn will improve the pearlite strength while refining the graphite. The content of Sn in the invention is controlled to be 0.07wt% -0.09 wt%.
Nb: the Nb element can reduce the iron liquid eutectic temperature, so that C atoms are difficult to diffuse, and the Nb-rich phase formed by Nb and elements such as C, N and the like can change the growth direction of graphite while forming a graphite core. A certain amount of Nb is added to enable graphite to be tiny and bent, meanwhile eutectic clusters are refined, and the mechanical property of the material is improved. In the invention, the Nb content is controlled to be 0.1-0.2 wt%.
Mo: mo element can refine primary austenite dendrites and eutectic groups, so that an austenite interdendritic region and the eutectic group region become small, and the free growth of graphite is limited. Eliminate thick graphite flake, promote the homogeneity of tissue to promote mechanical properties and heat conductivility simultaneously. In the invention, the Mo content is controlled to be 0.16-0.22 wt%.
The preparation method of the microalloyed high carbon gray cast iron with ultrahigh heat conduction and high strength comprises the following steps:
1) Taking pig iron, ferrosilicon, ferromanganese, ferrochromium, ferroniobium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and a carburant as raw materials, and weighing the raw materials according to the element composition of high-carbon gray cast iron to be prepared;
2) Smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferroniobium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and a carburant;
3) After furnace burden is melted down, scum is removed, molten iron is discharged out of the furnace, and in-ladle inoculation treatment is carried out (an inoculant is placed at the bottom of a casting ladle, and the molten iron is directly cast into the ladle after being discharged out of the furnace);
4) Pouring the molten iron in the ladle into a sand mold, air-cooling to room temperature, and taking out to obtain the microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength.
In the technical scheme, in the step 2), the smelting equipment is a medium-frequency induction furnace.
In the technical scheme, in the step 3), the tapping temperature of the molten iron is 1520-1550 ℃.
In the technical scheme, in the step 3), the inoculant adopted at the inoculation position in the ladle is 75SiFe, and the addition amount of the inoculant is 0.7 mass percent of the molten iron.
In the technical scheme, in the step 4), the pouring temperature is 1330-1350 ℃.
According to the technical scheme, in the step 4), the used molding sand is furan resin sand.
The terms used in the present invention generally have meanings commonly understood by those of ordinary skill in the art, unless otherwise specified. In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the following embodiments.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art. Materials, reagents, devices, instruments, apparatuses and the like used in the following examples are commercially available unless otherwise specified.
The present invention is further illustrated by the following examples.
Example 1
The microalloyed high carbon gray cast iron with ultrahigh heat conductivity coefficient and high strength comprises the following chemical components in percentage by mass: 3.91% of C, 1.29% of Si, 0.59% of Mn, 0.09% of S, 0.37% of Cu, 0.25% of Cr, 0.09% of Sn, 0.17% of Nb, 0.18% of Mo, and the balance of Fe as a matrix element and inevitable impurity elements.
The preparation method of the gray cast iron material comprises the following steps: firstly, taking pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and a carburant as raw materials, and weighing the raw materials according to the element composition of high-carbon gray cast iron to be prepared; then smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant in a medium-frequency induction furnace to obtain molten iron; after furnace burden is melted down, scum is removed, and ladle inoculation treatment is carried out, namely 75SiFe inoculant with the mass percent of 0.7% is placed at the bottom of a casting ladle, molten iron is directly cast into the ladle after being discharged, and the tapping temperature of the molten iron is 1530 ℃; and finally, pouring the molten iron in the ladle into a furan resin sand mold, wherein the pouring temperature is 1330 ℃, and after air cooling to room temperature, opening the box and shakeout, taking out a gray cast iron sample.
The microalloyed high carbon gray cast iron of example 1, which has ultrahigh heat conductivity and high strength, was tested to have a tensile strength (GB/T9439-2010) of 224MPa and a heat conductivity (ASTMC 518-04 test method for determining steady-state heat flux and heat transfer characteristics by heat flow meter method) of 77W/(m K). The graphite structure is shown in FIG. 1, and the matrix structure is shown in FIG. 2. The graphite is in A type, and the pearlite content in the matrix structure is more than 98%.
Example 2
The microalloyed high carbon gray cast iron material with ultrahigh heat conductivity coefficient and high strength comprises the following chemical components in percentage by mass: 3.99% of C, 1.17% of Si, 0.59% of Mn, 0.07% of S, 0.39% of Cu, 0.13% of Cr, 0.09% of Sn, 0.12% of Nb, 0.2% of Mo, and the balance of Fe as a matrix element and unavoidable impurity elements.
The preparation method of the gray cast iron material comprises the following steps: firstly, taking pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant as raw materials, and weighing the raw materials according to the element composition of high-carbon gray cast iron to be prepared; then smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant in a medium-frequency induction furnace; after furnace burden is melted down, removing scum, and carrying out in-ladle inoculation treatment, namely, placing 75SiFe inoculant with the mass percentage of 0.7% at the bottom of a casting ladle, directly casting molten iron into the ladle after the molten iron is discharged, wherein the discharging temperature of the molten iron is 1520 ℃; and finally, pouring the molten iron in the ladle into a furan resin sand mold, wherein the pouring temperature is 1350 ℃, and opening the box to remove sand and take out a gray cast iron sample after air cooling to room temperature.
The microalloyed high carbon gray cast iron with ultrahigh thermal conductivity and high strength of example 2 is tested, and has the tensile strength (GB/T9439-2010) of 223Mpa and the thermal conductivity (ASTMC 518-04, a test method for measuring steady-state heat flux and heat transfer characteristics by a heat flow meter method) of 74W/(m K). The graphite is A type, and the pearlite content in the matrix structure is more than 98%.
Example 3
The microalloyed high carbon gray cast iron material with ultrahigh heat conductivity coefficient and high strength comprises the following chemical components in percentage by mass: 3.74% of C, 1.48% of Si, 0.69% of Mn, 0.1% of S, 0.25% of Cu, 0.22% of Cr, 0.08% of Sn, 0.18% of Nb, 0.2% of Mo, and the balance of Fe as a matrix element and unavoidable impurity elements.
The preparation method of the gray cast iron material comprises the following steps: firstly, taking pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant as raw materials, and weighing the raw materials according to the element composition of high-carbon gray cast iron to be prepared; then smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant in a medium-frequency induction furnace; after furnace burden is melted down, scum is removed, and ladle inoculation treatment is carried out, namely 75SiFe inoculant with the mass percent of 0.7% is placed at the bottom of a casting ladle, molten iron is directly cast into the ladle after being discharged, and the tapping temperature of the molten iron is 1530 ℃; and finally, pouring the molten iron in the ladle into a furan resin sand mold, wherein the pouring temperature is 1350 ℃, and opening the box to remove sand and take out a gray cast iron sample after air cooling to room temperature.
The microalloyed high carbon gray cast iron of example 3, which has ultrahigh heat conductivity and high strength, was tested to have a tensile strength (GB/T9439-2010) of 235MPa and a heat conductivity (ASTMC 518-04, test method for determining steady-state heat flux and heat transfer characteristics by heat flow meter method) of 69W/(m K). The graphite is in A type, and the pearlite content in the matrix structure is more than 98%.
Comparative example 1
The common gray cast iron material comprises the following chemical components in percentage by mass: 3.66% of C, 1.24% of Si, 0.78% of Mn, 0.12% of S, 0.28% of Cu, 0.13% of Cr, 0.08% of Sn, 0.03% of Nb, 0.003% of Te, and the balance of Fe and inevitable impurity elements.
Gray cast iron of comparative example 1 was tested and found to have a tensile strength (GB/T9439-2010) of 222Mpa and a thermal conductivity (astm c518-04 test method for determining steady state heat flux and heat transfer characteristics by heat flow meter method) of 58W/(m x K).
Compared with the experimental results of the examples 1-3 and the comparative example 1, the microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength has excellent heat conductivity and mechanical property.
It should be understood that the above embodiments are only examples for clarity of description, and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither necessary nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength is characterized by comprising the following chemical components in percentage by mass: 3.74 to 3.99 percent of C, 1.15 to 1.5 percent of Si, 0.55 to 0.7 percent of Mn, 0.07 to 0.1 percent of S, 0.25 to 0.5 percent of Cu, 0.1 to 0.25 percent of Cr, 0.07 to 0.09 percent of Sn, 0.1 to 0.2 percent of Nb, 0.16 to 0.22 percent of Mo, and the balance of Fe and inevitable impurities.
2. The microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength as claimed in claim 1, wherein the high carbon gray cast iron consists of the following chemical components in percentage by mass: 3.91% of C, 1.29% of Si, 0.59% of Mn, 0.09% of S, 0.37% of Cu, 0.25% of Cr, 0.09% of Sn, 0.17% of Nb, 0.18% of Mo, and the balance of Fe and inevitable impurity elements.
3. The microalloyed high carbon gray cast iron with ultrahigh thermal conductivity and high strength as claimed in claim 1, wherein the high carbon gray cast iron comprises, by mass, 3.99% of C, 1.17% of Si, 0.59% of Mn, 0.07% of S, 0.39% of Cu, 0.13% of Cr, 0.09% of Sn, 0.12% of Nb, 0.2% of Mo, and the balance of Fe and inevitable impurity elements.
4. The microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength as claimed in claim 1, wherein the high carbon gray cast iron comprises, by mass, 3.74% of C, 1.48% of Si, 0.69% of Mn, 0.1% of S, 0.25% of Cu, 0.22% of Cr, 0.08% of Sn, 0.18% of Nb, 0.2% of Mo, and the balance of Fe and inevitable impurity elements.
5. The method for preparing microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength as claimed in claim 1, characterized by comprising the following steps:
1) Taking pig iron, ferrosilicon, ferromanganese, ferrochrome, ferromanganese, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant as raw materials, and weighing the raw materials according to the chemical composition of high-carbon gray cast iron to be prepared;
2) Smelting pig iron, ferrosilicon, ferromanganese, ferrochrome, ferrocolumbium, ferromolybdenum, pure copper, pure tin, ferrous sulfide and carburant;
3) After furnace burden is melted down, scum is removed, molten iron is discharged out of the furnace, and in-ladle inoculation treatment is carried out;
4) Pouring the molten iron in the ladle into a sand mold, air-cooling to room temperature, and taking out to obtain the microalloyed high-carbon gray cast iron with ultrahigh heat conductivity and high strength.
6. The microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength according to claim 5, wherein the smelting equipment in the step 2) is a medium frequency induction furnace.
7. The microalloyed high carbon gray cast iron with ultra-high thermal conductivity and high strength according to claim 5, wherein the tapping temperature of the molten iron in the step 3) is 1520 ℃ -1550 ℃.
8. The microalloyed high carbon gray cast iron with ultrahigh heat conductivity and high strength as set forth in claim 5, wherein the inoculant used in the in-ladle inoculation treatment in the step 3) is 75SiFe, and the addition amount is 0.7wt% of molten iron.
9. The microalloyed high carbon gray cast iron with ultra-high thermal conductivity and high strength according to claim 5, wherein, in the step 4), the pouring temperature is 1330-1350 ℃.
10. The microalloyed high carbon gray cast iron with ultrahigh thermal conductivity and high strength according to claim 5, wherein the molding sand used in the step 4) is furan resin sand.
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| JPH03146637A (en) * | 1989-11-01 | 1991-06-21 | Kusaka Reametaru Kenkyusho:Kk | Cast iron and its modifying method |
| CN103225038A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Low cooper content high carbon equivalent high alloy gray cast iron |
| CN103225035A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Cooper-free high carbon equivalent high alloy gray cast iron |
| CN103834852A (en) * | 2014-03-19 | 2014-06-04 | 四川大学 | Tin and niobium composite alloying gray pig iron and production process thereof |
| RU2013129988A (en) * | 2010-12-02 | 2015-01-10 | Сканиа Св Аб | GRAY IRON ALLOY AND BRAKE DISC CONTAINING GRAY IRON ALLOY |
| CN113930663A (en) * | 2020-07-14 | 2022-01-14 | 定州市天泰汽车零部件有限公司 | Gray cast iron with high thermal conductivity and high strength |
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2022
- 2022-10-28 CN CN202211332186.1A patent/CN115612916A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03146637A (en) * | 1989-11-01 | 1991-06-21 | Kusaka Reametaru Kenkyusho:Kk | Cast iron and its modifying method |
| RU2013129988A (en) * | 2010-12-02 | 2015-01-10 | Сканиа Св Аб | GRAY IRON ALLOY AND BRAKE DISC CONTAINING GRAY IRON ALLOY |
| CN103225038A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Low cooper content high carbon equivalent high alloy gray cast iron |
| CN103225035A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Cooper-free high carbon equivalent high alloy gray cast iron |
| CN103834852A (en) * | 2014-03-19 | 2014-06-04 | 四川大学 | Tin and niobium composite alloying gray pig iron and production process thereof |
| CN113930663A (en) * | 2020-07-14 | 2022-01-14 | 定州市天泰汽车零部件有限公司 | Gray cast iron with high thermal conductivity and high strength |
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