CN110711851A - High-strength durable die material and preparation method thereof - Google Patents
High-strength durable die material and preparation method thereof Download PDFInfo
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- CN110711851A CN110711851A CN201910975665.7A CN201910975665A CN110711851A CN 110711851 A CN110711851 A CN 110711851A CN 201910975665 A CN201910975665 A CN 201910975665A CN 110711851 A CN110711851 A CN 110711851A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/01—Selection of materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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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
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention discloses a high-strength durable die material and a preparation method thereof, belonging to the technical field of die material preparation. Compared with the prior art, the die material has the advantages that the hardness and the tensile strength are respectively improved by at least 52.55% and 34.25%, and the die material can meet higher requirements of die materials for automobile stamping parts.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of preparation of mold materials, and particularly relates to a high-strength durable mold material and a preparation method thereof.
[ background of the invention ]
In the automobile stamping part, one part of the automobile stamping part is directly formed into automobile parts after stamping, and the other part of the automobile stamping part is formed into the automobile parts after being processed by welding, machining, painting or other processes after stamping. The automobile stamping parts are various in variety, and for example, the automobile shock absorber stamping parts comprise spring trays, spring seats, spring brackets, end covers, sealing covers, compression valve sleeves, oil seal seats, bottom covers, dust covers, impellers, oil cylinders, support lugs, supports and the like. A large amount of cold stamping processes are adopted in the production of automobile stamping parts, and the method can meet the requirements of industrial multi-variety and mass production of automobile stamping parts. In medium and heavy-duty automobiles, most of the covering parts such as automobile body panels and the like, and some of the load-bearing and supporting parts such as automobile parts such as frames, compartments and the like are automobile stamping parts.
The automobile body die, especially the large and medium stamping die, is an important component of the automobile body manufacturing technology, the stamping die accounts for more than 40% of the total amount of the die, and the automobile stamping die is representative in the stamping die. The processing quality of automobile stamping parts is directly related to the level of a die, the material of the die is key to improve the level of the die, the die fails prematurely due to improper material selection and use, and the material accounts for more than 45% of the failed die.
Chinese application patent document "a wear-resistant automobile stamping part die material (application publication number: CN 107653412A)" discloses an automobile stamping part die material, which is prepared by taking pig iron and scrap steel as main raw materials, adding metal and nonmetal components, and adding nano-alumina into alloy liquid to prepare nodular cast iron, wherein the nodular cast iron is taken as the die material, can change the tissue structure of the cast iron and improve the mechanical property of the material, but the hardness and tensile strength of the automobile stamping part die material are lower, and the higher requirements of the automobile stamping part die material cannot be met.
[ summary of the invention ]
The invention provides a high-strength durable die material and a preparation method thereof, and aims to solve the practical technical problem of how to optimize components, dosage and the like and improve the hardness and tensile strength of the die material for automobile stamping parts on the basis of a die material raw material formula disclosed in ' a wear-resistant die material for automobile stamping parts ' (application publication number: CN107653412A) ' in Chinese application patent document.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a high-strength durable die material comprises the following steps:
(1) putting pig iron into a coreless intermediate frequency induction furnace for heating, adding steel powder when the pig iron starts to melt, forming mixed molten iron after the pig iron and the steel powder are completely melted, taking out the pig iron and pouring the pig iron into a prepared casting ladle, preheating the casting ladle to 735-764 ℃ in advance, pressing a nodulizer into particles with the diameter of 4.2-12.3mm, putting the particles into a groove of the casting ladle, covering a layer of carbonized straw ash with the thickness of 1.8-4.3mm on the particles, adding an inoculant, and covering a layer of carbonized straw ash with the thickness of 1.4-4.8 mm;
(2) the casting temperature is 1460-1500 ℃, 0.9-1.3 percent of chromium powder, 0.24-0.53 percent of molybdenum powder, 0.2-0.6 percent of nickel powder, 1.5-2.1 percent of antimony powder, 3.1-4.6 percent of tin powder, 0.17-0.34 percent of nano cobalt carbide, 0.25-0.38 percent of nano tantalum carbide and 0.54-0.68 percent of nano titanium silicide which account for the mass of the mixed molten iron are added into the ladle for melting, mixed molten iron is formed on the surface, a deslagging agent is sprinkled on the liquid surface of the mixed molten iron of the ladle, and after the added metal is completely melted, slag on the surface of the mixed molten iron is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.003-0.007% of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.03-0.05% of the mass of the mixed molten iron, stirring for 1.2-2.5h to complete the ladle, boxing after the ladle is completed for 2.8-5.4h, and performing shot blasting to prepare the high-strength durable mold material.
Preferably, the pig iron in the step (1) comprises the following components in percentage by mass: 2.6 to 3.2 percent of carbon, 0.81 to 0.94 percent of silicon, 0.09 to 0.11 percent of manganese, 0.04 to 0.06 percent of phosphorus, 0.021 to 0.024 percent of sulfur and the balance of iron.
Preferably, the steel powder in the step (1) accounts for 6.8-9.7% of the pig iron by mass.
Preferably, the nodulizer in step (1) is a 7-8 nodulizer.
Preferably, the 7-8 nodulizer is used in an amount of 0.25-0.63% of the mass of the mixed molten iron.
Preferably, 75SiFe is used as the inoculant in step (1).
Preferably, the inoculant 75SiFe has a particle size of 3.2-5.6 mm.
Preferably, the inoculant 75SiFe accounts for 0.12-0.24% of the mass of the mixed molten iron.
Preferably, the deslagging agent in the step (2) is perlite, and the dosage of the deslagging agent is 0.04-0.06% of the mass of the mixed molten iron.
The invention has the following beneficial effects:
(1) as can be seen from the data of examples 1 to 3 and comparative example 5, the high-strength durable mold material applied in examples 1 to 3 has excellent hardness and tensile strength; meanwhile, as can be seen from the data of examples 1 to 3, example 2 is the most preferred example.
(2) As can be seen from the data of example 2 and comparative examples 1 to 4, the nanocobalt carbide, nanocantalum carbide and nanocitanium silicide play a synergistic role in preparing the high-strength durable mold material, and the hardness and tensile strength of the mold material are synergistically improved, which is that:
during smelting, nanometer cobalt carbide, nanometer tantalum carbide and nanometer titanium silicide are added into mixed molten iron to modify nanometer cobalt carbide and nanometer tantalum carbide, nanometer nucleation formed by nanometer size and high surface activity grains in mixed molten iron and nanometer cobalt carbide and nanometer tantalum carbide grains are dispersed homogeneously on the base.
(3) As can be seen from the data of examples 1-3 and comparative example 5, the hardness and tensile strength of the die material of examples 1-3 are significantly higher than those of comparative example 5 (prior art), wherein the hardness and tensile strength are respectively improved by at least 52.55% and 34.25%, which can meet the requirements of the die material of automobile stamping parts.
[ detailed description ] embodiments
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
In an embodiment, the method for preparing the high-strength durable mold material comprises the following steps:
(1) putting pig iron into a coreless medium-frequency induction furnace for heating, wherein the pig iron comprises the following components in percentage by mass: 2.6 to 3.2 percent of carbon, 0.81 to 0.94 percent of silicon, 0.09 to 0.11 percent of manganese, 0.04 to 0.06 percent of phosphorus, 0.021 to 0.024 percent of sulfur and the balance of iron. Adding steel powder when pig iron begins to melt, wherein the usage amount of the steel powder accounts for 6.8-9.7% of the weight of the pig iron, forming mixed molten iron after the pig iron and the steel powder are completely melted, discharging the mixed molten iron and pouring the molten iron into a prepared casting ladle, preheating the casting ladle to 735-764 ℃ in advance, pressing 7-8 nodulizing agents into particles with the diameter of 4.2-12.3mm, placing the particles into a groove of the casting ladle, wherein the usage amount of the 7-8 nodulizing agents accounts for 0.25-0.63% of the weight of the mixed molten iron, covering a layer of carbonized straw ash with the thickness of 1.8-4.3mm on the casting ladle, and then adding an inoculant, wherein the inoculant adopts 75SiFe, the particle size of 3.2-5.6mm, the usage amount of 0.12-0.24% of the weight of the mixed molten iron, and covering a layer of the carbonized straw ash with the thickness of 1.4-4.8 mm;
(2) the casting temperature is 1460-1500 ℃, 0.9-1.3% of chromium powder, 0.24-0.53% of molybdenum powder, 0.2-0.6% of nickel powder, 1.5-2.1% of antimony powder, 3.1-4.6% of tin powder, 0.17-0.34% of nano cobalt carbide, 0.25-0.38% of nano tantalum carbide and 0.54-0.68% of nano titanium silicide which account for the mass of the mixed molten iron are added into a ladle for melting while casting, mixed molten iron is formed on the surface, a deslagging agent is scattered on the mixed molten iron liquid surface of the ladle, the deslagging agent is perlite, the dosage is 0.04-0.06% of the mass of the mixed molten iron, and after the added metal is completely melted, slag on the surface of the mixed molten iron liquid is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.003-0.007% of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.03-0.05% of the mass of the mixed molten iron, stirring for 1.2-2.5h to complete the ladle, boxing after the ladle is completed for 2.8-5.4h, and performing shot blasting to prepare the high-strength durable mold material.
The present invention is illustrated by the following more specific examples.
Example 1
A preparation method of a high-strength durable die material comprises the following steps:
(1) putting pig iron into a coreless medium-frequency induction furnace for heating, wherein the pig iron comprises the following components in percentage by mass: 2.7% of carbon, 0.83% of silicon, 0.1% of manganese, 0.04% of phosphorus, 0.022% of sulfur and the balance of iron. Adding steel powder when pig iron begins to melt, wherein the usage amount of the steel powder accounts for 6.9% of the weight of the pig iron, forming mixed molten iron after the pig iron and the steel powder are completely melted, discharging the mixed molten iron and pouring the mixed molten iron into a prepared casting ladle, preheating the casting ladle to 752 ℃ in advance, pressing 7-8 nodulizing agents into particles with the diameter of 4.6mm, placing the particles into a groove of the casting ladle, wherein the usage amount of the 7-8 nodulizing agents accounts for 0.28% of the weight of the mixed molten iron, covering a layer of carbonized straw ash with the thickness of 2.1mm on the casting ladle, adding an inoculant, wherein the inoculant adopts 75SiFe, the particle size of which is 3.4mm, the usage amount of which accounts for 0.18% of the weight of the mixed molten iron, and covering a layer of carbonized straw ash with the thickness of;
(2) the casting temperature is 1472 ℃, 1% of chromium powder, 0.28% of molybdenum powder, 0.5% of nickel powder, 1.5% of antimony powder, 3.6% of tin powder, 0.19% of nano cobalt carbide, 0.29% of nano tantalum carbide and 0.57% of nano titanium silicide which account for the mass of the mixed molten iron are added to the ladle for melting while the ladle is poured, mixed molten iron is formed on the surface, a deslagging agent is spread on the liquid surface of the mixed molten iron of the ladle, the deslagging agent is perlite, the dosage is 0.05% of the mass of the mixed molten iron, and after the added metal is completely melted, slag on the surface of the mixed molten iron is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.003 percent of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.04 percent of the mass of the mixed molten iron, stirring for 1.6h to complete the ladle, boxing after the ladle is completed for 3.1h, and performing shot blasting to prepare the high-strength durable die material.
Example 2
A preparation method of a high-strength durable die material comprises the following steps:
(1) putting pig iron into a coreless medium-frequency induction furnace for heating, wherein the pig iron comprises the following components in percentage by mass: 3.1% of carbon, 0.92% of silicon, 0.1% of manganese, 0.05% of phosphorus, 0.023% of sulfur and the balance of iron. Adding steel powder when pig iron begins to melt, wherein the usage amount of the steel powder accounts for 9.5 percent of the weight of the pig iron, forming mixed molten iron after the pig iron and the steel powder are completely melted, discharging the mixed molten iron and pouring the mixed molten iron into a prepared casting ladle, preheating the casting ladle to 758 ℃ in advance, pressing 7-8 nodulizing agents into particles with the diameter of 8.1mm, putting the particles into a groove of the casting ladle, wherein the usage amount of the 7-8 nodulizing agents accounts for 0.45 percent of the weight of the mixed molten iron, covering a layer of carbonized straw ash with the thickness of 3.6mm on the casting ladle, adding an inoculant, wherein the inoculant adopts 75SiFe, the particle size of which is 4.5mm, the usage amount of which accounts for 0.18 percent of the weight of the mixed molten iron, and covering a layer of carbonized straw ash with the thickness of;
(2) the pouring temperature is 1492 ℃, 1.2 percent of chromium powder, 0.46 percent of molybdenum powder, 0.4 percent of nickel powder, 1.9 percent of antimony powder, 3.8 percent of tin powder, 0.26 percent of nano cobalt carbide, 0.29 percent of nano tantalum carbide and 0.63 percent of nano titanium silicide which account for the mass of the mixed molten iron are added into a ladle for melting while the ladle is poured, mixed molten iron is formed on the surface, a deslagging agent is spread on the liquid surface of the mixed molten iron of the ladle, the deslagging agent is perlite, the dosage is 0.05 percent of the mass of the mixed molten iron, and after the added metal is completely melted, slag on the surface of the mixed molten iron is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.006 percent of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.04 percent of the mass of the mixed molten iron, stirring for 2.2 hours to finish the ladle, boxing after the ladle is finished for 3.6 hours, and performing shot blasting treatment to obtain the high-strength durable mould material.
Example 3
A preparation method of a high-strength durable die material comprises the following steps:
(1) putting pig iron into a coreless medium-frequency induction furnace for heating, wherein the pig iron comprises the following components in percentage by mass: 3.1% of carbon, 0.89% of silicon, 0.11% of manganese, 0.06% of phosphorus, 0.022% of sulfur and the balance of iron. Adding steel powder when pig iron begins to melt, wherein the usage amount of the steel powder accounts for 9.6% of the weight of the pig iron, forming mixed molten iron after the pig iron and the steel powder are completely melted, discharging the mixed molten iron and pouring the mixed molten iron into a prepared casting ladle, preheating the casting ladle to 757 ℃, pressing 7-8 nodulizer into particles with the diameter of 11.6mm, placing the particles into a groove of the casting ladle, wherein the usage amount of the 7-8 nodulizer accounts for 0.58% of the weight of the mixed molten iron, covering a layer of carbonized straw ash with the thickness of 4.1mm on the casting ladle, adding an inoculant, wherein the inoculant adopts 75SiFe, the particle size of the carbonized straw ash is 3.8mm, the usage amount of the carbonized straw ash accounts for 0.19% of the weight of the mixed molten iron, and covering a layer of carbonized straw ash with the thickness;
(2) the pouring temperature is 1493 ℃, 1.1 percent of chromium powder, 0.5 percent of molybdenum powder, 0.6 percent of nickel powder, 2 percent of antimony powder, 4.3 percent of tin powder, 0.31 percent of nano cobalt carbide, 0.32 percent of nano tantalum carbide and 0.58 percent of nano titanium silicide which account for the mass of the mixed molten iron are added into a ladle for melting while the ladle is poured, mixed molten iron is formed on the surface, a deslagging agent is sprinkled on the liquid surface of the mixed molten iron of the ladle, the deslagging agent is perlite, the dosage is 0.06 percent of the mass of the mixed molten iron, and after the added metal is completely melted, slag on the surface of the mixed molten iron is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.007% of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.05% of the mass of the mixed molten iron, stirring for 2.4 hours to complete the ladle, boxing after the ladle is completed for 5.3 hours, and performing shot blasting treatment to obtain the high-strength durable die material.
Comparative example 1
The process is substantially the same as that of example 2 except that the raw materials of step (2) for preparing the high-strength durable mold material lack nanocobalt carbide, nanocantalum carbide and nanocitanium silicide.
Comparative example 2
The process was essentially the same as that used in example 2, except that the nanocobalt carbide was absent from the step (2) raw material used to produce the high strength durable mold material.
Comparative example 3
The process was essentially the same as that used in example 2, except that the nanosized tantalum carbide was absent from the step (2) feedstock used to form the high strength durable mold material.
Comparative example 4
The process was essentially the same as that used in example 2, except that the nano-titanium silicide was absent from the step (2) raw material used to produce the high strength durable mold material.
Comparative example 5
The process of the Chinese application patent document 'a wear-resistant die material for automobile stamping parts (application publication number: CN 107653412A)' in examples 1-3 is adopted to prepare the high-strength durable die material.
The high-strength durable mold materials prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to the same performance test in the same manner, and the test results are shown in the following table.
From the above table, it can be seen that: (1) as can be seen from the data of examples 1 to 3 and comparative example 5, the high-strength durable mold material applied in examples 1 to 3 has excellent hardness and tensile strength; meanwhile, as can be seen from the data of examples 1 to 3, example 2 is the most preferred example.
(2) As can be seen from the data of example 2 and comparative examples 1 to 4, the nanocobalt carbide, nanocantalum carbide and nanocitanium silicide play a synergistic role in preparing the high-strength durable mold material, and the hardness and tensile strength of the mold material are synergistically improved, which is that:
during smelting, nanometer cobalt carbide, nanometer tantalum carbide and nanometer titanium silicide are added into mixed molten iron to modify nanometer cobalt carbide and nanometer tantalum carbide, nanometer nucleation formed by nanometer size and high surface activity grains in mixed molten iron and nanometer cobalt carbide and nanometer tantalum carbide grains are dispersed homogeneously on the base.
(3) As can be seen from the data of examples 1-3 and comparative example 5, the hardness and tensile strength of the mold materials of examples 1-3 are significantly higher than those of comparative example 5 (prior art), wherein the hardness and tensile strength are increased by at least 52.55% and 34.25%, respectively.
The above description should not be taken as limiting the invention to the embodiments, but rather, as will be apparent to those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which shall be deemed to fall within the scope of the invention as defined by the claims appended hereto.
Claims (10)
1. A preparation method of a high-strength durable die material is characterized by comprising the following steps:
(1) putting pig iron into a coreless intermediate frequency induction furnace for heating, adding steel powder when the pig iron starts to melt, forming mixed molten iron after the pig iron and the steel powder are completely melted, taking out the pig iron and pouring the pig iron into a prepared casting ladle, preheating the casting ladle to 735-764 ℃ in advance, pressing a nodulizer into particles with the diameter of 4.2-12.3mm, putting the particles into a groove of the casting ladle, covering a layer of carbonized straw ash with the thickness of 1.8-4.3mm on the particles, adding an inoculant, and covering a layer of carbonized straw ash with the thickness of 1.4-4.8 mm;
(2) the casting temperature is 1460-1500 ℃, 0.9-1.3 percent of chromium powder, 0.24-0.53 percent of molybdenum powder, 0.2-0.6 percent of nickel powder, 1.5-2.1 percent of antimony powder, 3.1-4.6 percent of tin powder, 0.17-0.34 percent of nano cobalt carbide, 0.25-0.38 percent of nano tantalum carbide and 0.54-0.68 percent of nano titanium silicide which account for the mass of the mixed molten iron are added into the ladle for melting, mixed molten iron is formed on the surface, a deslagging agent is sprinkled on the liquid surface of the mixed molten iron of the ladle, and after the added metal is completely melted, slag on the surface of the mixed molten iron is removed;
(3) and (3) during pouring, spraying nano alumina powder accounting for 0.003-0.007% of the mass of the mixed molten iron on the mixed molten iron flowing out of the ladle, adding quartz sand accounting for 0.03-0.05% of the mass of the mixed molten iron, stirring for 1.2-2.5h to complete the ladle, boxing after the ladle is completed for 2.8-5.4h, and performing shot blasting to prepare the high-strength durable mold material.
2. The method for preparing a high-strength durable mold material according to claim 1, wherein the pig iron in the step (1) comprises the following components in percentage by mass: 2.6 to 3.2 percent of carbon, 0.81 to 0.94 percent of silicon, 0.09 to 0.11 percent of manganese, 0.04 to 0.06 percent of phosphorus, 0.021 to 0.024 percent of sulfur and the balance of iron.
3. The method for producing a high-strength durable mold material as claimed in claim 1, wherein the steel powder is used in an amount of 6.8 to 9.7% by mass of the pig iron in the step (1).
4. The method for preparing a high strength durable mold material according to claim 1, wherein the spheroidizing agent in step (1) is 7-8.
5. The method for preparing a high-strength durable mold material according to claim 4, wherein the 7-8 nodulizer is used in an amount of 0.25-0.63% by mass of the molten iron mixture.
6. The method of claim 1, wherein the inoculant used in step (1) is 75 SiFe.
7. The method of claim 6, wherein the inoculant 75SiFe has a particle size of 3.2-5.6 mm.
8. The method of claim 7, wherein the inoculant 75SiFe is used in an amount of 0.12-0.24% by weight of the molten iron mixture.
9. The method for preparing a high-strength durable mold material as claimed in claim 1, wherein the deslagging agent in step (2) is perlite in an amount of 0.04-0.06% by mass of the mixed molten iron.
10. A high strength durable mold material made according to the method of any one of claims 1-9.
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