CN111690866A - Preparation method of high-strength and high-hardness nodular cast iron - Google Patents
Preparation method of high-strength and high-hardness nodular cast iron Download PDFInfo
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- CN111690866A CN111690866A CN202010504238.3A CN202010504238A CN111690866A CN 111690866 A CN111690866 A CN 111690866A CN 202010504238 A CN202010504238 A CN 202010504238A CN 111690866 A CN111690866 A CN 111690866A
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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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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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
- C21D5/00—Heat treatments 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
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention belongs to the field of metallurgical industry, and particularly relates to a preparation method of high-strength high-hardness nodular cast iron. The preparation steps are as follows: 1) calculating the raw material dosage according to the proportion and preparing the materials; 2) blowing the modifier into a smelting furnace to ensure that the modifier and molten metal in the smelting furnace are fully and uniformly stirred, and then standing and preserving heat; 3) the method comprises the steps of casting ladle pretreatment, namely paving a first inoculant on the outer surface of a nodulizer, then paving a deslagging agent on the outer surface of the first inoculant, and carrying out nodulizing treatment and first inoculation; after slagging off, adding a second inoculant for secondary inoculation, and simultaneously adding a nitrogen removal agent for quenching and tempering; 4) casting to obtain a prefabricated part; 5) and (6) heat treatment. The technical scheme of the invention has the technical advantages that: the nodular cast iron prepared by the invention can obtain the nodular cast iron with high tensile strength and high material hardness under the condition of avoiding using expensive alloys such as Mo, Ni, V and the like, thereby greatly reducing the production cost and improving the market competitiveness of the product.
Description
Technical Field
The invention belongs to the field of metallurgical industry, and particularly relates to a preparation method of high-strength high-hardness nodular cast iron.
Background
The nodular cast iron is widely applied to machine tool casting products. The machine tool type casting products require the material to have good tensile strength and higher material hardness due to the use characteristics of the machine tool type casting products. In the prior art, when high-strength and high-hardness nodular cast iron is produced, elements such as Cu, Mo, Ni, V, Ti and Cr are usually added to improve the strength and hardness of the nodular cast iron, which has become a preferred scheme of a plurality of casting enterprises. In addition, since metals such as Mo, Ni, V, etc. are expensive, the casting production cost is high.
In the production process of the nodular cast iron in the prior art, except a small amount of inoculant for covering the nodulizer, the rest of inoculant is flushed into a nodular iron ladle along with iron flow when molten iron is discharged for the first time, the effective time of the inoculant is 8-10 minutes, namely the inoculant begins to perform inoculation fade after 8-10 minutes from the time of adding the molten iron. In general practical production, a pack of molten iron needs to be poured into a plurality of boxes of castings, about 6-8 minutes is generally needed from the beginning of the molten iron discharging to the first box of castings, and the rest of castings are poured in the rest of inoculation time, which is difficult to realize in production.
Disclosure of Invention
The invention aims to provide a preparation method of high-strength high-hardness nodular cast iron by prolonging the effective inoculation time of an inoculant so as to finish pouring of a multi-box casting.
The technical scheme adopted for achieving the purpose of the invention is as follows: a preparation method of high-strength and high-hardness nodular cast iron comprises the following preparation steps:
1) calculating the raw material dosage according to the proportion and preparing the materials; cleaning a smelting furnace; adding the recycled iron, the graphite steel and the ferrosilicon alloy into a smelting furnace together, heating until the raw materials in the smelting furnace are molten metal, and then standing and preserving heat;
2) blowing the modifier into a smelting furnace to ensure that the modifier and molten metal in the smelting furnace are fully and uniformly stirred, and then standing and preserving heat;
3) the method comprises the steps of casting ladle pretreatment, namely paving a first inoculant on the outer surface of a nodulizer, then paving a deslagging agent on the outer surface of the first inoculant, and carrying out nodulizing treatment and first inoculation; after slagging off, adding a second inoculant for secondary inoculation, and simultaneously adding a nitrogen removal agent for quenching and tempering;
4) casting, namely preheating a casting ladle, pouring pretreated molten metal liquid into the casting ladle at a constant speed, preserving heat of the casting ladle in a constant temperature environment, and casting the molten metal liquid in the casting ladle into a forming mold to obtain a prefabricated member;
5) and (4) performing heat treatment, namely performing heat treatment on the prepared prefabricated member, and naturally cooling to normal temperature to obtain the high-strength high-hardness nodular cast iron.
Preferably, in the step 1), the temperature of the smelting furnace is heated to 1500-1530 ℃, and the standing and heat preservation time is 20-25 minutes; in the step 2), standing and heat preservation are carried out for 10-15 minutes; in the step 4), the casting ladle is preheated to 950-1000 ℃, the constant temperature is 1500-1530 ℃, and the temperature is kept for 5-10 minutes; in the step 5), the heat treatment is carried out under the following process conditions: after the molten metal is cast into a forming die, cooling to 810-830 ℃, heating the forming die and the metal in the forming die to 920-960 ℃ at a speed of 5 ℃/min, preserving heat for 3-5 hours, naturally cooling to 280 ℃, heating the forming die and the metal in the forming die to 720-750 ℃ at a speed of 5 ℃/min, preserving heat for 3-5 hours, and naturally cooling to normal temperature.
Preferably, the high-strength high-hardness nodular cast iron comprises the following raw materials in parts by weight: 100 parts of recycled iron, 100 parts of graphite steel, 10-30 parts of ferrosilicon alloy, 3-5 parts of modifier, 3-5 parts of nodulizer, 3-5 parts of first inoculant, 3-5 parts of second inoculant, 5-10 parts of slag remover and 1-3 parts of nitrogen remover.
Preferably, the modifier is modified silicon carbide micro powder, and the modified silicon carbide micro powder is prepared by modifying through the following steps:
1) uniformly mixing silicon carbide micro powder and magnesium aluminum silicate according to a proportion to prepare a mixture;
2) mixing the mixture prepared in the step 1) with polyethylene glycol and a silane coupling agent in proportion, and then carrying out ball milling reaction to prepare the modified silicon carbide micro powder.
Further preferably, the mass ratio of the silicon carbide micro powder to the magnesium aluminum silicate is 1: 0.1 to 0.3; the mass ratio of the silicon carbide micro powder to the polyethylene glycol to the silane coupling agent is 1: (1-3): (0.05-0.1).
Further preferably, the first inoculant according to the invention comprises the following components in percentage by mass: 20.2%, Si: 55.3%, Sn: 9.6%, Ba: 12.3 percent, and the balance being Fe; the components of the second inoculant are as follows by mass fraction, Si: 74.2%, Al: 1.2%, Ca: 0.8 percent, and the balance being Fe; the nodulizer comprises the following components in percentage by mass: 42.9%, Mg: 6.2%, Ca: 1.4%, Re: 0.8 percent and the balance of Fe.
More preferably, the silane coupling agent is a mixture of N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethyloxy) silane and gamma- (2, 3-glycidoxy) propyl trimethoxy silane, wherein the mass ratio of the N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethyloxy) silane to the gamma- (2, 3-glycidoxy) propyl trimethoxy silane is 1: 1 to 3.
Further preferably, the ball milling reaction of the present invention has the following reaction conditions: the ball milling speed is 800-1200 rmp/min, the ball milling time is 1-5 h, and the ball-material ratio is 20-60: 1.
the technical scheme of the invention has the technical advantages that:
the nodular cast iron prepared by the invention can obtain the nodular cast iron with high tensile strength and high material hardness under the condition of avoiding using expensive alloys such as Mo, Ni, V and the like, thereby greatly reducing the production cost and improving the market competitiveness of the product.
The invention improves the spheroidization state of the casting by matching the modifier, the nodulizer, the first inoculant and the second inoculant, and the spheroidization rate of the cast body reaches more than 90 percent.
The invention carries out surface modification treatment on the modifier silicon carbide micro powder, effectively improves the surface characteristics of the silicon carbide micro powder and enhances the dispersion uniformity and stability of the silicon carbide micro powder.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
1) Calculating the raw material dosage according to the proportion and preparing the materials; cleaning a smelting furnace; adding 100 parts of recycled iron, 100 parts of graphite steel and 10 parts of ferrosilicon into a smelting furnace together according to parts by weight, heating the smelting furnace to 1500 ℃ until raw materials in the smelting furnace are molten and uniformly stirred, cooling a molten metal sample in the smelting furnace for component analysis, adjusting the content of molten metal components in the smelting furnace according to the component analysis result, standing and preserving heat after the chemical components of the molten metal meet the requirements, wherein the heat preservation time is 25 minutes;
2) blowing 3 parts of modifier silicon carbide micro powder into a smelting furnace, fully and uniformly stirring the modifier and molten metal in the smelting furnace, and then keeping the temperature and standing for 10 minutes;
3) pretreating, namely taking 3 parts of nodulizer, paving 3 parts of first inoculant on the outer surface of the nodulizer, paving 5 parts of deslagging agent on the outer surface of the first inoculant, and performing nodulizing and first inoculation on molten metal in a smelting furnace; after slagging off, adding 3 parts of a second inoculant for secondary inoculation, and simultaneously adding 1 part of a nitrogen removal agent for quenching and tempering;
4) casting, namely preheating a casting ladle to 950 ℃, pouring the pretreated molten metal liquid into the casting ladle at a constant speed, preserving the heat of the casting ladle at 1530 ℃ for 5 minutes at the same time, and then casting the molten metal liquid in the casting ladle into a forming mold to obtain a prefabricated member;
5) and (3) performing heat treatment on the prepared prefabricated member, wherein the process conditions are as follows: after the molten metal is cast into a forming die, the molten metal is cooled to 810 ℃, then the forming die and the metal in the forming die are heated to 920 ℃ at the speed of 5 ℃/minute and are kept warm for 5 hours, then the molten metal is naturally cooled to 280 ℃, the forming die and the metal in the forming die are heated to 720 ℃ at the speed of 5 ℃/minute and are kept warm for 5 hours, and then the molten metal is naturally cooled to the normal temperature.
The modifier in this example was selected from fine silicon carbide powder modified by the following procedure. The modified silicon carbide micro powder is prepared by the following steps:
1) uniformly mixing 100g of silicon carbide micro powder and 20g of magnesium aluminum silicate to prepare a mixture;
2) mixing the mixture prepared in the step 1) with 20g of polyethylene glycol and 5g of silane coupling agent, and then carrying out ball milling reaction, wherein the ball milling rotation speed is 1000rmp/min, the ball milling time is 2h, and the ball-material ratio is 30: 1, preparing the modified silicon carbide micro powder.
Wherein the silane coupling agent is prepared from N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethoxy) silicane and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silicane in a mass ratio of 1: 2, mixing the components.
Example 2
1) Calculating the raw material dosage according to the proportion and preparing the materials; cleaning a smelting furnace; adding 100 parts of recycled iron, 100 parts of graphite steel and 30 parts of ferrosilicon into a smelting furnace together according to parts by weight, heating the smelting furnace to 1530 ℃ until raw materials in the smelting furnace are molten and uniformly stirred, cooling a molten metal sample in the smelting furnace for component analysis, adjusting the content of molten metal components in the smelting furnace according to the component analysis result, standing and preserving heat after the chemical components of the molten metal meet the requirements, and preserving heat for 20 minutes;
2) blowing 5 parts of modifier silicon carbide micro powder into a smelting furnace, fully and uniformly stirring the modifier and molten metal in the smelting furnace, and then keeping the temperature and standing for 10 minutes;
3) pretreating, namely taking 5 parts of nodulizer, paving 5 parts of first inoculant on the outer surface of the nodulizer, paving 3 parts of deslagging agent on the outer surface of the first inoculant, and performing nodulizing and first inoculation on molten metal in a smelting furnace; after slagging off, adding 5 parts of a second inoculant for secondary inoculation, and simultaneously adding 3 parts of a nitrogen removal agent for quenching and tempering;
4) casting, namely preheating a casting ladle to 1000 ℃, pouring the pretreated molten metal liquid into the casting ladle at a constant speed, preserving the temperature of the casting ladle at the constant temperature of 1500 ℃ for 15 minutes, and casting the molten metal liquid in the casting ladle into a forming mold to obtain a prefabricated member;
5) and (3) performing heat treatment on the prepared prefabricated member, wherein the process conditions are as follows: after the molten metal is cast into a forming die, the molten metal is cooled to 830 ℃, then the forming die and the metal in the forming die are heated to 960 ℃ at the speed of 5 ℃/minute and are insulated for 3 hours, then the molten metal is naturally cooled to 280 ℃, the forming die and the metal in the forming die are heated to 750 ℃ at the speed of 5 ℃/minute and are insulated for 3 hours, and then the molten metal is naturally cooled to the normal temperature.
The modifier in this example was selected from fine silicon carbide powder modified by the following procedure. The modified silicon carbide micro powder is prepared by the following steps:
1) uniformly mixing 100g of silicon carbide micro powder and 10g of magnesium aluminum silicate to prepare a mixture;
2) mixing the mixture prepared in the step 1) with 10g of polyethylene glycol and 6g of silane coupling agent, and then carrying out ball milling reaction, wherein the ball milling rotation speed is 800rmp/min, the ball milling time is 1h, and the ball-material ratio is 20: 1, preparing the modified silicon carbide micro powder.
Wherein the silane coupling agent is prepared from N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethoxy) silicane and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silicane in a mass ratio of 1: 1, mixing to obtain the product.
Example 3
1) Calculating the raw material dosage according to the proportion and preparing the materials; cleaning a smelting furnace; adding 100 parts of recycled iron, 100 parts of graphite steel and 20 parts of ferrosilicon into a smelting furnace together according to parts by weight, heating the smelting furnace to 1520 ℃, cooling a molten metal sample in the smelting furnace for component analysis after raw materials in the smelting furnace are molten and uniformly stirred, adjusting the content of molten metal components in the smelting furnace according to the component analysis result, standing and preserving heat after the chemical components of the molten metal meet the requirements, and preserving heat for 23 minutes;
2) blowing 4 parts of modifier silicon carbide micro powder into a smelting furnace, fully and uniformly stirring the modifier and molten metal in the smelting furnace, and then keeping the temperature and standing for 12 minutes;
3) pretreating, namely taking 4 parts of nodulizer, paving 4 parts of first inoculant on the outer surface of the nodulizer, paving 4 parts of deslagging agent on the outer surface of the first inoculant, and performing nodulizing and first inoculation on molten metal in a smelting furnace; 4 parts of a second inoculant is added for secondary inoculation after slagging off, and 2 parts of a nitrogen removing agent is added for quenching and tempering;
4) casting, namely preheating a casting ladle to 980 ℃, pouring the pretreated molten metal liquid into the casting ladle at a constant speed, preserving the temperature of the casting ladle at 1520 ℃ for 12 minutes at the same time, and then casting the molten metal liquid in the casting ladle into a forming mold to obtain a prefabricated member;
5) and (3) performing heat treatment on the prepared prefabricated member, wherein the process conditions are as follows: after the molten metal is cast into a forming die, the molten metal is cooled to 820 ℃, then the forming die and the metal in the forming die are heated to 950 ℃ at the speed of 5 ℃/minute and are kept warm for 4 hours, then the molten metal is naturally cooled to 280 ℃, the forming die and the metal in the forming die are heated to 730 ℃ at the speed of 5 ℃/minute and are kept warm for 4 hours, and then the molten metal is naturally cooled to the normal temperature.
The modifier of examples 1-3 is preferably silicon carbide micropowder, which is modified by the following steps:
1) uniformly mixing silicon carbide micro powder and magnesium aluminum silicate according to a proportion to prepare a mixture;
2) mixing the mixture prepared in the step 2) with polyethylene glycol and a silane coupling agent in proportion, and then carrying out ball milling reaction to prepare the modified silicon carbide micro powder.
The modifier in this example was selected from fine silicon carbide powder modified by the following procedure. The modified silicon carbide micro powder is prepared by the following steps:
1) uniformly mixing 100g of silicon carbide micro powder and 30g of magnesium aluminum silicate to prepare a mixture;
2) mixing the mixture prepared in the step 1) with 30g of polyethylene glycol and 10g of silane coupling agent, and then carrying out ball milling reaction, wherein the ball milling rotation speed is 1200rmp/min, the ball milling time is 5h, and the ball-material ratio is 60: 1, preparing the modified silicon carbide micro powder.
Wherein the silane coupling agent is prepared from N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethoxy) silicane and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silicane in a mass ratio of 1: 3, mixing the components.
The components of the first inoculant according to the above examples 1 to 3 are, by mass fraction, C: 20.2%, Si: 55.3%, Sn: 9.6%, Ba: 12.3 percent, and the balance being Fe; the components of the second inoculant are as follows by mass fraction, Si: 74.2%, Al: 1.2%, Ca: 0.8 percent, and the balance being Fe; the nodulizer comprises the following components in percentage by mass: 42.9%, Mg: 6.2%, Ca: 1.4%, Re: 0.8 percent and the balance of Fe.
For the iron castings obtained in the embodiments 1-3, according to the test standards GB/T228.1-2010 and GB/T231.1-2018, the room-temperature tensile strength reaches 790MPa (780-820 MPa), and the Brinell hardness reaches 300 (290-330).
Comparative example
Different from the example 1, the second inoculant in the example 1 is used for primary inoculation, and the rest is the same as the example 1. The iron casting obtained in this comparative example had a tensile strength at room temperature of about 700MPa (between 690 and 720 MPa) and a Brinell hardness of about 236 (between 230 and 240).
The nodular cast iron prepared by the invention can obtain the nodular cast iron with high tensile strength and high material hardness under the condition of avoiding using expensive alloys such as Mo, Ni, V and the like, thereby greatly reducing the production cost and improving the market competitiveness of the product.
Claims (9)
1. A preparation method of high-strength and high-hardness nodular cast iron is characterized by comprising the following steps: the preparation steps are as follows:
calculating the raw material dosage according to the proportion and preparing the materials; cleaning a smelting furnace; adding the recycled iron, the graphite steel and the ferrosilicon alloy into a smelting furnace together, heating until the raw materials in the smelting furnace are molten metal, and then standing and preserving heat;
2) blowing the modifier into a smelting furnace to ensure that the modifier and molten metal in the smelting furnace are fully and uniformly stirred, and then standing and preserving heat;
3) the method comprises the steps of casting ladle pretreatment, namely paving a first inoculant on the outer surface of a nodulizer, then paving a deslagging agent on the outer surface of the first inoculant, and carrying out nodulizing treatment and first inoculation; after slagging off, adding a second inoculant for secondary inoculation, and simultaneously adding a nitrogen removal agent for quenching and tempering;
4) casting, namely preheating a casting ladle, pouring pretreated molten metal liquid into the casting ladle at a constant speed, preserving heat of the casting ladle in a constant temperature environment, and casting the molten metal liquid in the casting ladle into a forming mold to obtain a prefabricated member;
5) and (4) performing heat treatment, namely performing heat treatment on the prepared prefabricated member, and naturally cooling to normal temperature to obtain the high-strength high-hardness nodular cast iron.
2. The method for preparing high-strength high-hardness nodular cast iron according to claim 1, wherein the method comprises the following steps: in the step 1), heating the smelting furnace to 1500-1530 ℃, and standing for 20-25 minutes; in the step 2), standing and heat preservation are carried out for 10-15 minutes; in the step 4), the casting ladle is preheated to 950-1000 ℃, the constant temperature is 1500-1530 ℃, and the temperature is kept for 5-10 minutes; in the step 5), the heat treatment is carried out under the following process conditions: after the molten metal is cast into a forming die, cooling to 810-830 ℃, heating the forming die and the metal in the forming die to 920-960 ℃ at a speed of 5 ℃/min, preserving heat for 3-5 hours, naturally cooling to 280 ℃, heating the forming die and the metal in the forming die to 720-750 ℃ at a speed of 5 ℃/min, preserving heat for 3-5 hours, and naturally cooling to normal temperature.
3. The method for preparing high-strength high-hardness ductile iron according to claim 1 or 2, characterized in that: the raw materials comprise the following components in parts by weight: 100 parts of recycled iron, 100 parts of graphite steel, 10-30 parts of ferrosilicon alloy, 3-5 parts of modifier, 3-5 parts of nodulizer, 3-5 parts of first inoculant, 3-5 parts of second inoculant, 5-15 parts of slag remover and 1-3 parts of nitrogen remover.
4. The method for preparing high-strength high-hardness nodular cast iron according to claim 3, wherein the method comprises the following steps: the modifier is modified silicon carbide micro powder, and the modified silicon carbide micro powder is prepared by modification through the following steps:
1) uniformly mixing silicon carbide micro powder and magnesium aluminum silicate according to a proportion to prepare a mixture;
2) mixing the mixture prepared in the step 1) with polyethylene glycol and a silane coupling agent in proportion, and then carrying out ball milling reaction to prepare the modified silicon carbide micro powder.
5. The method for preparing high-strength high-hardness nodular cast iron according to claim 4, wherein the method comprises the following steps: the mass ratio of the silicon carbide micro powder to the magnesium aluminum silicate is 1: 0.1 to 0.3; the mass ratio of the silicon carbide micro powder to the polyethylene glycol to the silane coupling agent is 1: (1-3): (0.05-0.1).
6. The method for preparing high-strength high-hardness nodular cast iron according to claim 3, wherein the method comprises the following steps: in the step 3), the components of the first inoculant in mass fraction are as follows: 20.2%, Si: 55.3%, Sn: 9.6%, Ba: 12.3 percent, and the balance being Fe; the components of the second inoculant are as follows by mass fraction, Si: 74.2%, Al: 1.2%, Ca: 0.8 percent, and the balance being Fe; the nodulizer comprises the following components in percentage by mass: 42.9%, Mg: 6.2%, Ca: 1.4%, Re: 0.8 percent and the balance of Fe.
7. The method for preparing high-strength high-hardness nodular cast iron according to claim 4, wherein the method comprises the following steps: the silane coupling agent in the step 2) is formed by mixing N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethoxy) silicane and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silicane.
8. The method for preparing high-strength high-hardness nodular cast iron according to claim 7, wherein the method comprises the following steps: the mass ratio of the N- (beta-aminoethyl) -gamma-aminopropyl trimethyl (ethoxy) silicane to the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silicane is 1: 1 to 3.
9. The method for preparing high-strength high-hardness nodular cast iron according to claim 4, wherein the method comprises the following steps: the ball milling reaction in the step 2) has the following reaction conditions: the ball milling speed is 800-1200 rmp/min, the ball milling time is 1-5 h, and the ball-material ratio is 20-60: 1.
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| CN113186448B (en) * | 2021-04-29 | 2022-06-28 | 东亚科技(苏州)有限公司 | Preparation process of high-performance vermicular graphite cast iron material casting |
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Application publication date: 20200922 |