CN110923388A - Preparation method of spherical vermicular graphite gray gradient cast iron glass mold material - Google Patents
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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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
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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- Organic Chemistry (AREA)
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Abstract
The invention relates to the technical field of metal materials, in particular to a preparation method of a spherical vermicular graphite gray gradient cast iron glass mold material, which comprises the following steps: heating furnace materials required by pig iron scrap steel and alloy in an intermediate frequency furnace to melt the furnace materials, sampling, measuring carbon and silicon components in the original iron liquid by adopting an RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system, and adjusting the components by adding ferrosilicon, a carburant or scrap steel according to the measurement result to reach the target components; sequentially adding a vermiculizer or nodulizer accounting for 0.20-0.27 percent of the mass of molten iron, 0.4 percent of inoculant and 1 percent of waste steel sheets into a pit on one side of a vermicular treatment bag to pretreat molten iron, measuring the vermicular rate and the inoculation state of a sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and pouring if the detection result shows that the sample is in a critical state; the method is simple to operate, can be used for one-step casting forming, has a good nodulizing effect of the inner cavity of the mold, does not react with the molten iron in the casting mold, and has good surface quality of the casting.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a preparation method of a spherical vermicular graphite gray gradient cast iron glass mold material.
Background
The working conditions of metal molds, such as glass molds, ingot molds and the like, which are used in the industry at present, are that the metal molds bear the repeated and cyclic heat action of high-temperature melt, the inner surfaces of the molds are in a periodic high-temperature thermal shock state, and the temperature difference between the inner surface and the outer surface is large. Therefore, the damage of the mold is mainly surface oxidation growth to reduce the dimensional accuracy and peel off the skin to scrap the mold, or the thermal conductivity is insufficient to cause the large internal and external stress of the mold to crack and scrap the mold. At present, the glass mold is made of single nodular cast iron, vermicular graphite cast iron and D-type graphite gray cast iron. The ductile iron mold has strong high-temperature oxidation resistance and long thermal fatigue life, but has poor thermal conductivity, and because the working temperature of the inner surface is high, very high thermal stress is inevitably generated under the condition that the temperature difference between the outer surface and the inner layer of the mold is very large, so that cracks are generated to cause the mold to be scrapped. The grey cast iron has strong heat conductivity, but has low high-temperature oxidation resistance, and finally the mould is scrapped because the dimensional stability of the working surface of the mould is reduced and the skin is peeled off. The performance of the vermicular graphite cast iron is between that of nodular cast iron and that of gray cast iron, but the performance of the vermicular graphite cast iron depends on the vermicular graphite rate, the performance of the low vermicular graphite cast iron is close to that of the nodular cast iron, the vermicular graphite cast iron has good oxidation resistance and poor thermal conductivity, the performance of the high vermicular graphite cast iron is close to that of the gray cast iron, and the high vermicular graphite cast iron has good thermal conductivity and poor oxidation.
In order to prolong the service life of the mold, there are many methods, one of which can be divided into two types according to the difference of the methods, and the other is to achieve the purpose of improving the mold performance by reasonable chemical component proportion, for example, CN102851568A discloses an alloy vermicular cast iron glass mold material and a preparation method thereof, wherein the chemical components are as follows: 3.5-3.6% carbon, 2.9-3.0% silicon, 0.4-0.5% manganese, 0.4-0.5% molybdenum, < 0.15% vanadium, < 0.10% titanium, 0.3-0.4% chromium, 0.4-0.5% nickel, < 0.05% phosphorus, < 0.03% sulfur, and the balance iron. Because the selection of the metal elements and the selection of the mass percentage are reasonable, the selected alloy elements have good solid solution strengthening effect, and the strength of the ferrite in a high-temperature environment is enhanced, so that the service life of the glass mold is prolonged. But the cost is increased due to the high noble metal content. CN105132796A discloses a medium silicon aluminum alloy vermicular graphite cast iron glass mould material and a preparation method thereof, wherein the chemical components of the material are 3.0-3.2% of carbon, 3.9-4.2% of silicon, 0.3-0.5% of manganese, 0.2-0.4% of molybdenum, 0.08-0.12% of titanium, less than 0.05% of phosphorus, less than 0.03% of sulfur and the balance of iron. The method prevents the oxygen element from further oxidizing the matrix through a compact oxide film formed by the silicon element so as to improve the oxidation resistance of the material, and although the oxidation resistance is improved, the heat conduction performance needs to be improved.
Another method is to prepare the composite material by utilizing the excellent properties of nodular cast iron and vermicular cast iron, for example, CN1316538A discloses a method for preparing the nodular vermicular composite material, which comprises the steps of putting Li, Ba, K and Na alkali metal salts accounting for 0.5 percent of the total amount of molten iron and a B-Fe composite modifier into a ladle bottom in advance before tapping molten iron, pressing copper accounting for 0.2 to 0.6 percent of the total amount of the molten iron on the modifier, adding rare earth and an inoculant during tapping molten iron 1/3, pouring the reacted molten iron into a sand mold with an iron core, and performing heat treatment on a blank after boxing to obtain the double-layer composite material with fine nodular graphite on the inner surface and vermicular graphite on the outer part. Compared with alloy gray cast iron, the method has the advantages of reduced cost and prolonged service life. However, the method cannot effectively utilize the respective excellent performances of the nodular cast iron and the gray cast iron, and the heat-conducting performance of the die still has a great space for improvement.
In order to comprehensively utilize the advantages of gray iron and ductile iron and fully utilize the good thermal conductivity of gray iron, the current preparation method can be divided into two methods, one is the preparation by a coating method, for example, Yangxing researches on coating a casting mold surface with a coating containing a nodulizer and pouring molten iron containing gray cast iron so that the prepared mold working surface layer is the ductile cast iron and the main body is still the composite material of gray cast iron. Although the method can comprehensively utilize the advantages of the nodular cast iron and the gray cast iron, when the method is used for pouring, the high-temperature molten iron reacts very violently with Mg element in the coating, the phenomenon of choking is often generated, the surface quality of the casting after cooling is poor, and the subsequent processing is difficult.
The other method is a two-step treatment method, for example, CN106868274A researches on ultra-fine nodular treatment of the surface of gray cast iron for a mold, the method performs laser remelting on the surface of the gray cast iron mold, needle martensite, lamellar cementite and residual austenite tissues can be obtained on the surface of cast iron after the melting, and then graphitization annealing is performed to obtain surface spherical graphite.
In addition, CN203878054U points out a bimetal glass mold, and the key position of inner chamber adopts copper alloy to make, and heat conduction speed is fast, and oxidation resistance is good, and long service life, and the outside adopts cast iron to make, and the inner chamber can be dismantled after wearing and tearing and change, and the price/performance ratio is higher. However, the mold has the problems of multiple processing procedures and higher production cost.
Disclosure of Invention
In order to solve the technical problems, the invention provides the preparation method of the nodular graphite cast iron glass mold material which is simple to operate, can be cast and formed at one time, has good nodulizing effect of the inner cavity of the mold, does not react with molten iron in the casting mold and has good casting surface quality.
The invention relates to a preparation method of a spherical vermicular graphite gray gradient cast iron glass mold material, which comprises the following steps:
A. pretreatment: heating furnace materials required by pig iron scrap steel and alloy in an intermediate frequency furnace to melt the furnace materials, sampling, measuring carbon and silicon components in the original iron liquid by adopting an RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system, and adjusting the components by adding ferrosilicon, a carburant or scrap steel according to the measurement result to reach the target components; sequentially adding a vermiculizer or nodulizer accounting for 0.20-0.27 percent of the mass of molten iron, 0.4 percent of inoculant and 1 percent of waste steel sheets into a pit on one side of a vermicular treatment ladle to pretreat molten iron, opening a ladle cover after the molten iron fully reacts in the ladle, slagging off, taking molten iron to pour a thermal analysis sample, measuring the vermicular rate and the inoculation state of the sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and pouring if the detection result shows that the molten iron is in a critical state;
B. pouring: pouring the molten iron qualified by the RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system into a sand mold with a chilling iron core, and naturally cooling to obtain the cast iron material with the spherical graphite form on the inner surface and the flake graphite form transition from the vermicular graphite form to the vermicular graphite form on the other parts.
According to the preparation method of the ductile graphite cast iron glass mold material, the pouring temperature in the step B is lower than 1380 ℃.
According to the preparation method of the spherical vermicular graphite gray gradient graphite cast iron glass mold material, the vermiculizer or nodulizer in the step A is a common rare earth magnesium alloy, and the inoculant in the step A is a silicon-barium inoculant.
According to the preparation method of the spherical vermicular graphite gray gradient graphite cast iron glass mold material, the graphite form of the inner cavity of the mold is spherical graphite, the thickness of the graphite is 3-15 mm, the thickness of the spherical graphite on the surface layer can be adjusted according to the thickness of a placed chilling block, and the graphite form of the rest part is gradually changed from vermicular graphite to A-shaped flake graphite.
Compared with the prior art, the invention has the beneficial effects that:
(1) the composite material prepared by the invention is a spherical/vermicular/limestone graphite form layered composite material, and the characteristics of strong oxidation resistance and excellent thermal fatigue resistance of the nodular cast iron can be fully utilized, so that the graphite form of the working inner cavity of the die is spherical graphite with good oxidation resistance; the vermicular graphite is used as the exterior of the die to be transited to the A-type graphite, the heat conducting property is good, heat can be rapidly dissipated, the stress in the die is reduced, the service life of the die is prolonged, and the melt forming speed is increased.
(2) The preparation method provided by the invention has simple process, and avoids the reaction in the cavity, so that the surface quality of the casting is good.
(3) The preparation method provided by the invention does not additionally increase the processing procedures and improves the production efficiency.
Drawings
FIGS. 1(a), (b), (c) and (d) are metallographic photographs showing transition of graphite morphology from the inner cavity to the outer edge of the mold in example 1 of the present invention by 100 times, respectively.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention relates to a preparation method of a spherical vermicular graphite gray gradient cast iron glass mold material, which comprises the following steps:
A. pretreatment: heating furnace materials required by pig iron scrap steel and alloy in an intermediate frequency furnace to melt the furnace materials, sampling, measuring carbon and silicon components in the original iron liquid by adopting an RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system, and adjusting the components by adding ferrosilicon, a carburant or scrap steel according to the measurement result to reach the target components; sequentially adding a vermiculizer or nodulizer accounting for 0.20-0.27 percent of the mass of molten iron, 0.4 percent of inoculant and 1 percent of waste steel sheets into a pit on one side of a vermicular treatment ladle to pretreat molten iron, opening a ladle cover after the molten iron fully reacts in the ladle, slagging off, taking molten iron to pour a thermal analysis sample, measuring the vermicular rate and the inoculation state of the sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and pouring if the detection result shows that the molten iron is in a critical state; the key point of the scheme is that molten iron is treated to be in a critical state, if the addition amount of a vermiculizer is too small, molten iron is not treated, spherical graphite cannot appear on the inner surface of the die, and the graphite in the cross section is flaky; if the addition amount of the vermiculizer is too much and molten iron is over-treated, the graphite form outside the die is still vermicular and globular, and the purpose of improving the heat conductivity cannot be achieved; therefore, the RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system is required to be used for detecting molten iron, and pouring can be carried out when the result is a critical state;
B. pouring: pouring the molten iron qualified by the RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system into a sand mold with a chilling iron core, and naturally cooling to obtain the cast iron material with the spherical graphite form on the inner surface and the flake graphite form transition from the vermicular graphite form to the vermicular graphite form on the other parts.
The casting temperature in the step B is lower than 1380 ℃; if the casting temperature is too high, the chilling capability of the iron core of the chilling block is reduced, and the spherical graphite cannot be formed on the inner surface.
The vermiculizer or nodulizer in the step A is common rare earth magnesium alloy, and the inoculant in the step A is silicon-barium inoculant.
The graphite form of the inner cavity of the die is spherical graphite, the thickness of the graphite is 3-15 mm, the thickness of the spherical graphite on the surface layer can be adjusted according to the thickness of the placed chilling block, and the graphite form of the rest part is gradually transited from vermicular graphite to A-shaped flake graphite.
Example 1:
as shown in fig. 1, a small wine bottle glass mold was cast by the following steps:
(1) 462kg of pig iron is added into a 500kg medium frequency induction furnace to be heated to a molten state, then 25kg of scrap steel, 1.8kg of ferromanganese, 3.5kg of ferromolybdenum, 3.9kg of ferrosilicon and 1kg of nickel are sequentially added, and carbon-silicon components in the original iron liquid are measured by an RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system, and the result is qualified;
(2) preheating a vermicularizing treatment bag to 700-800 ℃, simultaneously weighing 1.0kg (0.20%) of a vermicularizing agent, 2.0kg (0.4%) of an inoculant and 5.0kg (1%) of a waste steel sheet, and sequentially placing the vermicularizing agent, the inoculant and the waste steel sheet at a pit on one side of the bottom of the bag from bottom to top by adopting a 'Sanming' method;
(3) heating the molten iron to 1530-1540 ℃, discharging, pouring the molten iron into a treatment package, wherein the molten iron cannot directly impact a vermicular agent during discharging, slagging off after the molten iron fully reacts in the package, measuring the vermicular rate and the inoculation state of a sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and displaying that the molten iron is in a critical state according to a detection result;
(4) during molding, a chill iron core is placed in a sand mold which is in contact with an inner cavity of a glass mold, the temperature of the processed molten iron is measured, the temperature measurement result is 1380 ℃, the molten iron is poured into a casting mold, the cross section graphite form of the cooled casting is the spherical/vermicular/gray layered graphite form, wherein the surface layer of the casting is 3mm spherical graphite, and the graphite form of the rest part is gradually transited from vermicular graphite to A-type flake graphite.
Example 2:
a beer bottle glass mold is poured, and the steps are as follows:
(1) 920kg of pig iron is added into a 1000kg medium frequency induction furnace and heated to a molten state, then 50kg of scrap steel, 3.6kg of ferromanganese, 7kg of ferromolybdenum, 8kg of ferrosilicon and 2kg of nickel are sequentially added, a RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system is used for measuring carbon and silicon components in the original iron liquid, and the result indicates that 400g of carburant needs to be supplemented.
(2) The vermicularizing treatment ladle is preheated to 700-800 ℃, 2.7kg (0.27%) of vermicularizing agent, 4.0kg (0.4%) of inoculant and 10kg (1%) of waste steel sheet are weighed at the same time, and the vermicularizing treatment ladle is sequentially placed at a concave pit on one side of the ladle bottom from bottom to top by adopting a 'Sanming' method.
(3) Heating the molten iron to 1530-1540 ℃, discharging, pouring the molten iron into a treatment package, wherein the molten iron cannot directly impact a vermicular agent during discharging, slagging off after the molten iron fully reacts in the package, measuring the vermicular rate and the inoculation state of a sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and displaying that the molten iron is in a critical state according to a detection result.
(4) During molding, a chill iron core is placed in a sand mold which is in contact with an inner cavity of a glass mold, the temperature of the processed molten iron is measured, the temperature of the molten iron is 1375 ℃, the molten iron is poured into a casting mold, the section graphite form of the cooled casting is the spherical/vermicular/gray laminar graphite form, wherein the surface layer 15mm is spherical graphite, and the graphite form of the rest part is gradually transited from vermicular graphite to A-type flake graphite.
Theoretically, when the iron liquid is solidified, the growth direction of the graphite is influenced by the concentration of elements such as sulfur, oxygen and the like on the surface of the liquid phase at the front edge of the liquid phase, when the elements such as sulfur, oxygen and the like are enriched in the liquid phase at the front edge of the liquid phase, which is grown by the graphite, the elements can reduce the interfacial tension between the iron liquid and the graphite, so that the graphite grows into a lamellar shape, when the elements such as sulfur, oxygen and the like in the liquid phase at the front edge of the growth of the graphite are consumed by the elements such as magnesium, cerium and the like, the surface tension between the graphite and the liquid phase is equivalently increased, so that the graphite tends to grow into a spherical shape, in the invention, the iron liquid is pretreated at first, so that a small amount of elements such as sulfur, oxygen and the like are consumed, so that the graphite tends to grow into a spherical shape, if the small amount of magnesium element added is not enough to spheroidize the graphite, but due to chilling effect on the, a small amount of magnesium is not enough to vermiculize the graphite, so that the graphite grows into a flake shape. Based on the theory, the chill is placed in the sand mould of the working surface of the mould, and the iron liquid in the critical state is chilled to prepare the cast iron material with the graphite form on the inner surface being spherical and the graphite form on the rest parts being vermicular and transitioning to flaky ball/vermicular/gray layered graphite forms.
In conclusion, the preparation method of the spherical vermicular graphite cast iron glass mold material can make full use of the characteristics of strong oxidation resistance and excellent thermal fatigue resistance of the spherical vermicular graphite cast iron, so that the graphite form of the working inner cavity of the mold is spherical graphite with good oxidation resistance, the vermicular graphite outside is transited to A-type graphite, the heat conduction performance is good, the heat can be rapidly dissipated, the stress inside the mold is reduced, the service life of the mold is prolonged, and the melt forming speed is increased; the preparation method has simple process, and avoids the reaction in the cavity, so the surface quality of the casting is good; the preparation method does not increase additional processing procedures and improves the production efficiency.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The preparation method of the spherical vermicular graphite gray gradient cast iron glass mold material is characterized by comprising the following steps of:
A. pretreatment: heating furnace materials required by pig iron scrap steel and alloy in an intermediate frequency furnace to melt the furnace materials, sampling, measuring carbon and silicon components in the original iron liquid by adopting an RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system, and adjusting the components by adding ferrosilicon, a carburant or scrap steel according to the measurement result to reach the target components; sequentially adding a vermiculizer or nodulizer accounting for 0.20-0.27 percent of the mass of molten iron, 0.4 percent of inoculant and 1 percent of waste steel sheets into a pit on one side of a vermicular treatment ladle to pretreat molten iron, opening a ladle cover after the molten iron fully reacts in the ladle, slagging off, taking molten iron to pour a thermal analysis sample, measuring the vermicular rate and the inoculation state of the sample by using an RT-MCS2009 type vermicular cast iron intelligent online measurement and control system, and pouring if the detection result shows that the molten iron is in a critical state;
B. pouring: pouring the molten iron qualified by the RT-MCS2009 type vermicular graphite cast iron intelligent online measurement and control system into a sand mold with a chilling iron core, and naturally cooling to obtain the cast iron material with the spherical graphite form on the inner surface and the flake graphite form transition from the vermicular graphite form to the vermicular graphite form on the other parts.
2. The method for preparing a ductile graphite cast iron glass mold material according to claim 1, wherein the casting temperature in the step B is less than 1380 ℃.
3. The method for preparing a spheroidal graphite cast iron glass mold material according to claim 1, wherein the vermiculizer or nodulizer in step A is a common rare earth magnesium alloy, and the inoculant in step A is a silicon-barium inoculant.
4. The method for preparing a spheroidal graphite cast iron glass mold material according to claim 1, wherein the graphite form in the mold cavity is spheroidal graphite, the thickness is 3-15 mm, the thickness of the spheroidal graphite on the surface layer can be adjusted according to the thickness of the chill, and the graphite form of the rest part is gradually changed from vermicular graphite to A-type flake graphite.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115141971A (en) * | 2022-07-26 | 2022-10-04 | 苏州勤美达精密机械有限公司 | High-strength hydraulic pump body made of vermicular graphite cast iron and production process thereof |
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| CN85108041A (en) * | 1985-10-23 | 1987-04-29 | 东北工学院 | Glass mold material and production technique thereof |
| CN103205624A (en) * | 2013-04-16 | 2013-07-17 | 常熟建华模具科技股份有限公司 | Graphite cast iron glass mould of ferritic matrix and manufacturing method of mould |
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2019
- 2019-12-11 CN CN201911268014.0A patent/CN110923388A/en active Pending
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| CN85108041A (en) * | 1985-10-23 | 1987-04-29 | 东北工学院 | Glass mold material and production technique thereof |
| CN103205624A (en) * | 2013-04-16 | 2013-07-17 | 常熟建华模具科技股份有限公司 | Graphite cast iron glass mould of ferritic matrix and manufacturing method of mould |
Non-Patent Citations (1)
| Title |
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| 吴奎武等: "蠕化剂加入量对蠕墨铸铁组织和性能的影响", 《稀土》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115141971A (en) * | 2022-07-26 | 2022-10-04 | 苏州勤美达精密机械有限公司 | High-strength hydraulic pump body made of vermicular graphite cast iron and production process thereof |
| CN115141971B (en) * | 2022-07-26 | 2023-11-14 | 苏州勤美达精密机械有限公司 | Vermicular graphite cast iron high-strength hydraulic pump body and production process thereof |
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