CN114525374A - Scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron and preparation method thereof - Google Patents
Scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron and a preparation method thereof, wherein the inoculant comprises the following elements in percentage by mass: 36-37% of Si, 6-7% of V, 1.5-2.5% of Mn, 5.2-6.4% of Cr, 2.0-2.4% of N, 0.4-0.6% of Ca and the balance of Fe. The inoculant is added with vanadium, manganese and chromium elements and other small elements, the inoculation effect is improved through the synergistic effect of single elements and the elements, and the formation of bent, fine and passivated A-type graphite is promoted; the content of pearlite is increased, the spacing between pearlite layers is reduced, eutectic cell structures are optimized, the strength and the rigidity of the gray cast iron are improved, and the cutting processability of the casting is improved.
Description
Technical Field
The invention relates to the technical field of casting production of castings, in particular to a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron and a preparation method thereof.
Background
The gray cast iron has excellent casting performance, cutting processing performance and good wear resistance and vibration damping performance, and is widely used in the industries of machine tool part production, national defense science and technology, transportation and the like. With the rapid development of the national manufacturing industry, the gray cast iron material produced at present can not meet the high performance requirements, and particularly, high performance indexes such as high strength, high rigidity, low stress and the like are required for the part products in the industrial mother machine-machine tool industry. This means that there are higher demands for the four factors of the graphite morphology size, the pearlite matrix characteristic, the primary austenite dendrite morphology, and the eutectic cell characteristic in the gray cast iron structure. Therefore, in the production process of the casting, alloy elements such as silicon, calcium and the like are usually added in the smelting process for inoculation treatment, so that the aims of eliminating white cast, refining pearlite structure and promoting graphitization are fulfilled, and the aim of improving the performance of the casting is fulfilled.
Disclosure of Invention
The invention aims to improve the A-type graphite which is fine and evenly distributed, passivate the graphite of a matrix, improve the cutting processing performance of a gray cast iron casting, reduce the chilling tendency, refine a pearlite structure, improve the tensile strength, rigidity and hardness of the gray cast iron casting, and produce a machine tool bed casting with high strength, high rigidity, low stress and high wear resistance, thereby providing the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron and the preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron comprises the following elements in percentage by mass: 36-37% of Si, 6-7% of V, 1.5-2.5% of Mn, 5.2-6.4% of Cr, 2.0-2.4% of N, 0.4-0.6% of Ca and the balance of Fe.
Further preferably, the material also comprises Sc, and the mass percent of Sc is 1.7-2.1%.
Further preferably, the paint also comprises Y, and the mass percent of Y is 0.70-0.86%.
More preferably, the alloy further comprises Zn, and the mass percent of Zn is 0.15-0.2%.
The preparation method of the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron comprises the following steps:
s1: weighing the following raw materials: silicon iron, vanadium iron nitride, manganese iron nitride, ferrochrome, scandium yttrium stone and metal zinc, and crushing the raw materials into small pieces for later use;
s2: mixing the ferrosilicon, the ferrovanadium nitride, the ferromanganese nitride, the ferrochromium and the metal zinc small blocks prepared by the S1, and smelting and fusing;
s3: pouring the slurry smelted in the step S2 into a water-cooling model for ingot casting;
s4: cooling, crushing and screening the product obtained after the S3 ingot casting is finished;
s5: and (3) carrying out secondary crushing on the scandium-yttrium stone crushed in the step (S1) and the product treated in the step (S4), and then carrying out mechanical mixing to obtain the vanadium-manganese-chromium inoculation particles containing scandium and yttrium.
More preferably, the raw materials in S1 are crushed into 4-8 mm small pieces.
Further preferably, in S2, a 100KW induction electric furnace is adopted for smelting, wherein the frequency of the electric furnace is 200-1000 HZ, the smelting temperature is 1350-1400 ℃, and the smelting time is 25-30 minutes.
Preferably, the air in the induction furnace is replaced by argon gas, so that the induction furnace is in an argon protection state.
Further preferably, the water-cooling mold in S3 is composed of a lower mold and an insert, argon gas is filled in the mold cavity as a protective gas, and the insert is provided with a double-layer water circulation channel for increasing the cooling speed and reducing the temperature difference.
Further preferably, the particle size of the vanadium-manganese-chromium inoculation particle containing scandium and yttrium prepared in S5 is 0.5-7 mm.
Has the advantages that: a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron comprises the following elements in percentage by mass: 36-37% of Si, 6-7% of V, 1.5-2.5% of Mn, 5.2-6.4% of Cr, 2.0-2.4% of N, 0.4-0.6% of Ca and the balance of Fe, wherein the mechanism of each element is as follows:
the main elements are as follows:
si: the main components of the inoculant can reduce the solubility of carbon in austenite, promote graphite nucleation, change the form and the refining degree of graphite, and prevent the content from being too low, otherwise white cast can be generated;
v: the graphite and the matrix are refined to promote the formation of pearlite, but the white cast is generated when the V content is too high, and the cost is increased;
mn: dissolving in matrix and carbide to form a large amount of crystal cores, inhibiting the formation of ferrite, refining pearlite, improving inoculation effect, and preventing the content from being too high;
cr: belongs to anti-graphitization elements, refines pearlite, and can improve the hardness and the wear resistance of the gray cast iron by adding a proper amount of Cr;
trace elements:
ca: trace elements and strong desulfurizer are favorable for graphite nucleation;
n: the graphite flake has the advantages of shortened length, increased bending degree, passivated end part, stable pearlite due to a small amount of nitrogen element, and inhibited generation of ferrite, and D-type graphite and nitrogen pores are promoted if the content of N is high.
The elements have a synergistic effect: mn can form MnS with S to become the core of graphite, promote graphitization, strongly promote the formation of pearlite under the combined action of Cr, and improve the hardness and wear resistance of the gray cast iron; ca: can form a compound with O and S, and is more beneficial to graphite nucleation; a small amount of N and C can react with V to generate fine vanadium carbon nitrogen compounds, so that the dendrite number of primary austenite can be increased, a high amount of eutectic structure can be obtained, and the wear resistance of the casting can be obviously improved.
Drawings
FIG. 1 is a graph of the graphite structure of control and optimized gray cast iron samples according to the present invention;
FIG. 2 is a comparison of the matrix structure of the gray cast iron samples of the control group and the optimized group;
FIG. 3 is a comparison of primary austenite dendrite morphology of control and optimized gray cast iron samples according to the present invention;
FIG. 4 is the eutectic cell structure of the control and optimized gray iron samples of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 4 in the embodiment of the present invention.
Example 1:
a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron comprises the following elements in percentage by mass: si: 36.2%, V: 6.5%, Mn: 2%, Cr: 5.8%, N: 1.62%, Ca 0.49%, Sc: 1.9 percent, Y0.78 percent and Zn 0.2 percent;
the preparation method of the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron comprises the following steps:
s1: weighing the following raw materials: 48.6 parts of ferrosilicon (72% Si, 1% Ca and 1.5% Al), 10 parts of ferrovanadium nitride (65% V and 16.5% N), 2.5 parts of ferromanganese nitride (78.5% Mn and 5.2% N), 11.6 parts of ferrochromium (50% Cr), 5.6 parts of scandium-yttrium stone (34% Sc, 13.9% Y, 21.8% Si and 30% O) and 0.175 part of metallic zinc, crushing the raw materials into 4-8 mm small blocks by using a hammer crusher, and storing the scandium-yttrium stone raw materials separately for later use;
s2: mixing and drying the ferrosilicon, the ferrovanadium nitride, the ferromanganese nitride, the ferrochromium and the small metal zinc blocks prepared in the step S1, then putting the mixture into a 100KW (200-1000 HZ) medium-frequency induction furnace (except for scandium-yttrium stone), and carrying out smelting and fusion, wherein the smelting temperature is 1350-1400 ℃, and the time is about 25-30 minutes; during smelting, argon is used to replace air in the furnace, so that the electric furnace is in an argon protective atmosphere, and oxidation, burning loss and volatilization of elements can be reduced. In addition, during smelting, a magnetic stirring mode is adopted for continuous stirring, so that all elements in the molten metal are more uniformly mixed until the molten metal is completely melted without raw materials;
s3: pouring the slurry smelted in the step S2 into a water-cooling model filled with inert gas argon as protective gas for ingot casting; the pouring water-cooling model consists of an upper die, a lower die and an insert, argon is filled in a die cavity to be used as protective gas, and a double-layer water circulation channel is arranged in the insert, so that the cooling temperature gradient can be reduced, the cooling speed is accelerated, and the tissue compactness and the quality of an inoculant are improved;
s4: cooling, crushing and screening the product obtained after the S3 ingot casting is finished;
s5: and carrying out secondary crushing on the scandium-yttrium stone crushed in the step S1 and the product treated in the step S4, and mechanically mixing to obtain the scandium-yttrium-containing vanadium-manganese-chromium inoculation particles with the particle size of 0.5-7 mm.
Example 2:
a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron comprises the following elements in percentage by mass: 36% of Si, 6.5% of V, 2% of Mn, 5.8% of Cr, 1.62% of N, 0.486% of Ca, 1.7% of Sc, 0.7% of Y and 0.2% of Zn.
The preparation method of the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron comprises the following steps:
s1: weighing the following raw materials: 48.6 parts of ferrosilicon (72% Si, 1% Ca and 1.5% Al), 9.2 parts of ferrovanadium nitride (65% V and 16.5% N), 1.9 parts of ferromanganese nitride (78.5% Mn and 5.2% N), 10.4 parts of ferrochromium (50% Cr), 5 parts of scandium-yttrium stone (34% Sc, 13.9% Y, 21.8% Si and 30% O) and 0.15 part of metallic zinc, and crushing the raw materials into 4-8 mm small blocks by using a hammer crusher for later use, wherein the scandium-yttrium stone raw material is stored separately;
s2: s2: mixing and drying the ferrosilicon, ferrovanadium nitride, ferromanganese nitride, ferrochromium and small metal zinc blocks prepared by S1, and then putting the mixture into a 100KW (200-1000 HZ) medium-frequency induction furnace (except scandium and yttrium stone) for smelting and fusing, wherein the smelting temperature is 1350-1400 ℃ and the time is about 25-30 minutes; during smelting, argon is used to replace air in the furnace, so that the electric furnace is in an argon protective atmosphere, and oxidation, burning loss and volatilization of elements can be reduced. In addition, during smelting, a magnetic stirring mode is adopted for continuous stirring, so that all elements in the molten metal are more uniformly mixed until the molten metal is completely melted without raw materials;
s3: pouring the slurry smelted in the step S2 into a water-cooling model filled with inert gas argon as protective gas for ingot casting; the pouring water-cooling model consists of an upper die, a lower die and an insert, argon is filled in a die cavity as protective gas, and a double-layer water circulation channel is arranged in the insert, so that the cooling temperature gradient can be reduced, the cooling speed is accelerated, and the tissue compactness and the quality of an inoculant are improved;
s4: cooling, crushing and screening the product obtained after the S3 ingot casting is finished;
s5: and carrying out secondary crushing on the scandium-yttrium stone crushed in the step S1 and the product treated in the step S4, and mechanically mixing to obtain the scandium-yttrium-containing vanadium-manganese-chromium inoculation particles with the particle size of 0.5-7 mm.
Example 3:
a scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron comprises the following elements in percentage by mass: si: 36.3%, V: 7%, Mn: 2.5%, Cr: 6.4%, N: 1.92%, Ca 0.495%, Sc: 2.1%, Y0.86%, Zn 0.2%;
the preparation method of the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron comprises the following steps:
s1: weighing the following raw materials: 48.6 parts of ferrosilicon (72% Si, 1% Ca and 1.5% Al), 10.7 parts of ferrovanadium nitride (65% V and 16.5% N), 3.1 parts of ferromanganese nitride (78.5% Mn and 5.2% N), 12.8 parts of ferrochromium (50% Cr), 6.2 parts of scandium-yttrium stone (34% Sc, 13.9% Y, 21.8% Si and 30% O) and 0.2 part of metallic zinc, and then crushing the raw materials into 4-8 mm small blocks by using a hammer crusher for later use, and storing the scandium-yttrium stone raw materials separately;
s2: s2: mixing and drying the ferrosilicon, the ferrovanadium nitride, the ferromanganese nitride, the ferrochromium and the small metal zinc blocks prepared in the step S1, then putting the mixture into a 100KW (200-1000 HZ) medium-frequency induction furnace (except for scandium-yttrium stone), and carrying out smelting and fusion, wherein the smelting temperature is 1350-1400 ℃, and the time is about 25-30 minutes; during smelting, argon is used to replace air in the furnace, so that the electric furnace is in an argon protective atmosphere, and oxidation, burning loss and volatilization of elements can be reduced. In addition, during smelting, a magnetic stirring mode is adopted for continuous stirring, so that all elements in the molten metal are more uniformly mixed until the molten metal is completely melted without raw materials;
s3: pouring the slurry smelted in the step S2 into a water-cooling model filled with inert gas argon as protective gas for ingot casting; the pouring water-cooling model consists of an upper die, a lower die and an insert, argon is filled in a die cavity as protective gas, and a double-layer water circulation channel is arranged in the insert, so that the cooling temperature gradient can be reduced, the cooling speed is accelerated, and the tissue compactness and the quality of an inoculant are improved;
s4: cooling, crushing and screening the product obtained after the S3 ingot casting is finished;
s5: and carrying out secondary crushing on the scandium-yttrium stone crushed in the step S1 and the product treated in the step S4, and mechanically mixing to obtain the scandium-yttrium-containing vanadium-manganese-chromium inoculation particles with the particle size of 0.5-7 mm.
The action mechanism of the inoculant is as follows:
(1) the main elements are as follows:
si (35%): the main components of the inoculant can reduce the solubility of carbon in austenite, promote graphite nucleation, change the form and the refining degree of graphite, and prevent the content from being too low, otherwise white cast can be generated;
v (6-7%): the graphite and the matrix are refined to promote the formation of pearlite, but the white cast is generated when the V content is too high, and the cost is increased;
mn (1.5-2.5%): dissolving in matrix and carbide to form a large amount of crystal cores, inhibiting the formation of ferrite, refining pearlite, improving inoculation effect, and preventing the content from being too high;
cr (5.2-6.4%): belongs to anti-graphitization elements, refines pearlite, and can improve the hardness and the wear resistance of the gray cast iron by adding a proper amount of Cr.
(2) Trace elements:
ca (0.4-0.6%): trace elements and strong desulfurizer are favorable for graphite nucleation;
n (2.0-2.4%): the graphite flake has the advantages that the length of the graphite flake can be shortened, the bending degree is increased, the end part is passivated, a small amount of nitrogen can stabilize pearlite and inhibit the generation of ferrite, and if the content of N is high, the generation of D-type graphite and nitrogen pores can be promoted;
sc (1.7-2.1%) and Y (0.7-0.86%): the strong desulfurization and deoxidation capacities ensure that molten iron is purified, the graphitization capacity and the decay resistance are good, the graphite tip is passivated, austenite dendritic crystals are increased and refined, a large number of external cores are provided for graphite precipitation, conditions are created for improving the structure and the performance of cast iron, and chilling can be inhibited. Zn (0.2%): when the content is extremely low, the formation of graphite can be promoted, pearlite can be stabilized and refined, the mechanical property and the service performance are improved, and the white cast tendency is increased due to the higher content.
The synergistic effect is as follows:
the vanadium-manganese-chromium inoculant containing scandium and yttrium for the high-strength gray cast iron contains elements such as Si, V, Mn, Cr, N, Ca, Sc, Y, Zn and the like, and the elements have synergistic action. Mn can form MnS with S to become the core of graphite, promote graphitization, strongly promote the formation of pearlite under the combined action of Cr, and improve the hardness and wear resistance of the gray cast iron; ca: can form a compound with O and S, and is more beneficial to graphite nucleation; a small amount of N and C can react with V to generate fine vanadium carbon nitrogen compounds, so that the dendrite number of primary austenite can be increased, a high amount of eutectic structure can be obtained, and the wear resistance of the casting can be obviously improved. Meanwhile, the combined action of Sc, Y and Zn can reduce the S and O content in the molten iron, purify the molten iron, passivate the tip of graphite, bend the graphite, facilitate the obtaining of fine and uniformly distributed A-type graphite and improve the strength and hardness of the gray cast iron.
The application case is as follows:
the vanadium-manganese-chromium inoculant containing scandium and yttrium, prepared in the embodiments 1 to 3, has good inoculation capability, wherein the inoculant prepared in the embodiment 1 has the best effect, and the vanadium-manganese-chromium inoculant containing scandium and yttrium for high-strength gray cast iron can promote graphitization of gray cast iron, improve the eutectic structure number in a matrix, improve the tensile strength and hardness of gray cast iron, is beneficial to obtaining fine and uniformly distributed A-type graphite, passivate the tip of graphite, simultaneously inhibit the chilling tendency, improve the wear resistance, strength and hardness of gray iron, and properly improve the cutting processability.
Taking the example 1 as an example, drying a certain proportion of pig iron scrap, and then carrying out medium-frequency induction smelting at 100KW (200-1000 Hz), wherein the tapping temperature of molten iron is 1480-1500 ℃ for ensuring good fluidity and filling property of the molten iron; then, the liquid iron is inoculated in a ladle, the granularity of the ladle inoculant is 0.5 mm-7 mm, the adding amount of the ladle inoculant is 0.4 percent of the mass of the liquid iron, and the liquid iron is dried before use. And after the molten iron is fully inoculated, casting the molten iron into a resin sand sample with the diameter of phi 30mm multiplied by 300mm at 1360-1380 ℃ for cooling to obtain an optimized gray cast iron sample, setting the molten iron inoculated by the 72 ferrosilicon inoculant as a control group, and keeping the temperature of a smelting furnace and the casting temperature of the control group consistent with those of the optimized group. In order to ensure that the components of the gray cast iron meet the design requirements, a small amount of molten iron is taken to prepare a white sample before casting, a direct-reading spectrometer is used for component measurement, and the measurement results are as follows in the following table 1:
table 1 gray cast iron sample chemistry (wt.%)
The mechanical property test is carried out on the optimized group gray cast iron and the comparison gray cast iron sample, and the comparison result is shown in the following table 2:
TABLE 2 mechanical Properties of the gray cast iron samples
From table 2 it can be derived: tensile strength, brinell hardness and elastic modulus in the gray cast iron sample of the control group are lower, the number of eutectic cell structures in the optimized gray cast iron sample is obviously increased, the size is smaller and more uniform in distribution, the number of primary austenite dendritic crystals in the sample is increased, the dendrite spacing is reduced, secondary dendritic crystals are refined, the graphite form is more bent and smaller, meanwhile, the pearlite structure is more refined, and further the strength, the rigidity and the hardness of the gray cast iron are improved.
As shown in fig. 1, fig. 1(a) shows a control gray cast iron graphite structure, fig. 1(b) shows an optimized gray cast iron graphite structure, and the graphite in the control gray cast iron sample is a type a graphite and a type D graphite (about 10%), and is relatively long and is 3-4 grade. The graphite in the optimized group gray cast iron sample is A-type graphite, the shape of the graphite is more bent, the end part of the graphite is passivated, and the length of the graphite is 4-level, so that the shape of the graphite after the optimized group inoculation treatment is further improved, because Sc and Y in the inoculant can react with O, S to generate oxides and sulfides, and the nucleation of the graphite is increased.
As shown in FIG. 2, FIGS. 2(a) and 2(b) show the morphology of the matrix structure of the control gray iron sample, and FIGS. 2(c) and 2(d) show the morphology of the matrix structure of the optimized gray iron sample. The matrix structures of the optimized gray cast iron samples are pearlite and a small amount of ferrite, the inoculated and optimized structures are more refined, the content of the pearlite is increased by more than 98%, and the amount of the ferrite is reduced. This is because the addition of the Cr element in the inoculant of the optimized group, the element strongly promoting the formation of pearls, combined with other elements, leads to a reduction in the amount of white-bright ferrite in the matrix. Meanwhile, Mn element in the inoculant of the optimized group counteracts the effect of sulfur on hindering graphitization, promotes the formation of pearlite, refines the structure, reduces coarse lamellar pearlite, refines the pearlite structure and improves the wear resistance, strength and hardness of gray cast iron.
As shown in FIG. 3, FIG. 3(a) is the primary austenite dendrite morphology of the control gray cast iron specimen and FIG. 3(b) is the primary austenite dendrite morphology of the optimized gray cast iron specimen. The primary austenite dendrite spacing in the gray cast iron sample of the optimized group is larger, the number of the primary austenite dendrite spacing is smaller, a certain network structure is formed, and a small amount of N in the inoculant adopted by the optimized group can react with V to generate nitride, so that the number of the primary austenite dendrite spacing in the gray cast iron sample is increased, the space network structure is more complex, the dendrite spacing is reduced, secondary dendrite spacing is refined, the growth of graphite is hindered, the graphite form is more bent and finer, and the tensile strength and the hardness of the gray iron are improved.
As shown in FIG. 4, FIG. 4(a) shows the eutectic structure of the control gray cast iron sample, and FIG. 4(b) shows the eutectic structure of the optimized gray cast iron sample. The eutectic cell structure size in the gray cast iron sample of the control group is larger, and the number of eutectic cells is less; the number of eutectic structures in the optimized group of gray cast iron samples is obviously increased, the sizes of the gray cast iron samples are smaller, and the gray cast iron samples are distributed more uniformly. The reason is that the number of primary austenite dendritic crystals in the gray cast iron structure after the optimized group inoculation is increased, the nucleation of eutectic clusters can be promoted, and as the primary austenite dendritic crystals are relatively refined, the structure of the eutectic clusters is limited by space during growth, so that the eutectic cluster structure is refined, and the strength and the rigidity of the gray cast iron are improved.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (10)
1. A scandium-yttrium-containing vanadium-manganese-chromium inoculant for high-strength gray cast iron is characterized in that: comprises the following elements in percentage by mass: 36-37% of Si, 6-7% of V, 1.5-2.5% of Mn, 5.2-6.4% of Cr, 2.0-2.4% of N, 0.4-0.6% of Ca and the balance of Fe.
2. The scandium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 1 wherein: and the mass percent of Sc is 1.7-2.1%.
3. The scandium-manganese-chromium inoculant for high-strength gray cast iron as claimed in claim 1, wherein: also comprises Y, and the mass percent of Y is 0.70-0.86%.
4. The scandium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 1 wherein: and also comprises Zn, wherein the mass percent of Zn is 0.15-0.2%.
5. The method for preparing the scandium-yttrium-containing vanadium-manganese-chromium inoculant for the high-strength gray cast iron as claimed in any one of claims 1 to 4, wherein the method comprises the following steps:
s1: weighing the following raw materials: silicon iron, vanadium iron nitride, manganese iron nitride, ferrochrome, scandium yttrium stone and metal zinc, and crushing the raw materials into small pieces for later use;
s2: mixing the ferrosilicon, the ferrovanadium nitride, the ferromanganese nitride, the ferrochromium and the metal zinc small blocks prepared by the S1, and smelting and fusing;
s3: pouring the slurry smelted in the step S2 into a water-cooling model for ingot casting;
s4: cooling, crushing and screening the product obtained after the S3 ingot casting is finished;
s5: and (3) carrying out secondary crushing on the scandium-yttrium stone crushed in the step (S1) and the product treated in the step (S4), and then carrying out mechanical mixing to obtain the vanadium-manganese-chromium inoculation particles containing scandium and yttrium.
6. The method of preparing the scandium-yttrium containing vanadium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 5, wherein: and S1, crushing the raw materials into small blocks of 4-8 mm.
7. The method of preparing the scandium-yttrium containing vanadium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 5, wherein: s2, smelting by using a 100KW induction electric furnace, wherein the frequency of the electric furnace is 200-1000 HZ, the smelting temperature is 1350-1400 ℃, and the smelting time is 25-30 minutes.
8. The method of preparing the scandium-yttrium containing vanadium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 5, wherein: and the air in the induction furnace is replaced by adopting argon, so that the induction furnace is in an argon protection state.
9. The method of preparing the scandium-yttrium containing vanadium-manganese-chromium inoculant for high strength gray cast iron as claimed in claim 5, wherein: the water-cooling model in the S3 is composed of a lower die and an insert, argon is filled in the die cavity as protective gas, and a double-layer water circulation channel is arranged in the insert and used for accelerating the cooling speed and reducing the temperature difference.
10. The method for preparing the scandium-manganese-chromium inoculant for the high-strength gray cast iron, which comprises scandium and yttrium, as defined in claim 5, wherein: the particle size of the vanadium-manganese-chromium inoculation particles containing scandium and yttrium prepared in the S5 is 0.5-7 mm.
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| CN116356098A (en) * | 2023-04-23 | 2023-06-30 | 江苏亚峰合金材料有限公司 | Vanadium-manganese-chromium inoculant for environment-friendly high-strength gray cast iron |
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