CN115418556A - Inoculant for nodular cast iron and preparation method thereof - Google Patents
Inoculant for nodular cast iron and preparation method thereof Download PDFInfo
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- CN115418556A CN115418556A CN202211025992.4A CN202211025992A CN115418556A CN 115418556 A CN115418556 A CN 115418556A CN 202211025992 A CN202211025992 A CN 202211025992A CN 115418556 A CN115418556 A CN 115418556A
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- inoculant
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- cast iron
- nodular cast
- alloy
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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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses an inoculant for nodular cast iron and a preparation method thereof, and relates to the technical field of new industrial materials. The invention comprises the following raw materials in parts by weight: 68.8 parts of H-silicon-aluminum rare earth leftovers, 440 parts of H-silicon cerium-R, 10 parts of silicon calcium, 35.2 parts of aluminum alloy and 6 parts of metal cerium; the method comprises the following steps: s1: firstly, accurately weighing raw materials in parts by weight, crushing the raw materials, and mechanically and uniformly mixing the crushed raw materials; s2: placing the mixture in the S1 into an intermediate frequency furnace, and smelting alloy liquid meeting the component requirements through the intermediate frequency furnace; s3: and (3) placing the alloy liquid into a vacuum stirrer, and stirring uniformly under a vacuum state. The invention provides an inoculant for nodular cast iron and a preparation method thereof, wherein the inoculant can improve the mechanical properties and mechanical properties of the nodular cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like, and solves the problems that the existing inoculant is not ideal in performance and difficult to greatly improve the physical and chemical properties of the nodular cast iron.
Description
Technical Field
The invention belongs to the technical field of new industrial materials, and particularly relates to an inoculant for nodular cast iron and a preparation method thereof.
Background
Along with the continuous improvement of the material performance requirements of various industries on castings, the structure and the performance of the castings continuously present diversity, the casting production process presents the diversity, the inoculation treatment is used as a key link of the casting production, the requirements on the components of the inoculant are more and more accurate, and the granularity also can meet the requirements of the inoculation method.
Inoculation is to add a small amount of other substances into the liquid metal in the solidification process to promote nucleation and inhibit growth so as to achieve the purpose of refining grains. The inoculant is a substance capable of promoting graphitization, reducing chilling tendency, improving graphite form and distribution condition, increasing eutectic cell number and refining matrix structure, has good effect in a short time (about 5-8 minutes) after inoculation treatment, and is mainly suitable for general inoculation or later-stage instantaneous inoculation in various conditions.
The existing inoculant has low pertinence, is difficult to improve the tensile strength and the impact toughness of thick and large nodular cast iron, and is difficult to improve the nodularity and increase the ferrite nodular cast iron with graphite nodule number, so the existing inoculant cannot meet the requirements in actual use, and an improved technology is urgently needed in the market to solve the problems.
Disclosure of Invention
The invention aims to provide an inoculant for nodular cast iron and a preparation method thereof, wherein the inoculant can be used for improving the mechanical properties and mechanical properties such as tensile strength, impact toughness, wear resistance, hardness and the like of the nodular cast iron, and solves the problems that the existing inoculant is not ideal in performance and difficult to greatly improve the physical and chemical properties of the nodular cast iron.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an inoculant for nodular cast iron, which comprises the following raw materials in parts by weight: 68.8 parts of H-silicon-aluminum rare earth leftovers, 440 parts of H-silicon cerium-R, 10 parts of silicon calcium, 35.2 parts of aluminum alloy and 6 parts of metal cerium.
Further, the aluminum content in the aluminum alloy was 82%.
Further, the content of cerium in the metallic cerium was 98%.
The invention also provides a preparation method of the inoculant for the nodular cast iron, which comprises the following steps:
s1: firstly, accurately weighing raw materials in parts by weight, crushing the raw materials, and mechanically and uniformly mixing the crushed raw materials;
s2: placing the mixture in the S1 into an intermediate frequency furnace, and smelting alloy liquid meeting the component requirements through the intermediate frequency furnace;
s3: putting the alloy liquid into a vacuum stirrer, and uniformly stirring under a vacuum state;
s4: then placing the alloy liquid into ultrasonic equipment, and carrying out strengthening treatment on the alloy liquid through ultrasonic waves;
s5: pouring the alloy liquid after the strengthening treatment into a rapid cooling die to obtain a natural block alloy with the components meeting the requirements;
s6: and crushing the natural block alloy to the required granularity to obtain the inoculant finished product.
Further, the H-silicon-aluminum rare earth leftovers, H-silicon cerium-R, silicon calcium, aluminum alloy and metal cerium in the S1 are crushed to 120-140 meshes.
Further, the specific steps of the strengthening treatment in S4 are:
s41: placing the alloy liquid into a liquid container of ultrasonic equipment;
s42: and inserting the transmitting head into the alloy liquid, and transmitting ultrasonic waves for processing.
Further, in S4, the action time of the ultrasonic equipment is set to be 8-10min, the power of the ultrasonic equipment is set to be 1800W, and the frequency of the ultrasonic equipment is set to be 25KHz-30KHz.
The invention has the following beneficial effects:
1. the inoculant is prepared from the H-silicon-aluminum rare earth leftovers, the H-silicon-cerium-R, the silicon calcium, the aluminum alloy and the metal cerium, can recycle the H-silicon-aluminum rare earth leftovers, improves the utilization rate of waste resources, reduces the production cost, is prepared from the inoculant for the nodular cast iron through a high-temperature smelting process, is combined in a chemical reaction manner in multiple phases, is applied to the external treatment process of a molten iron furnace, has low treatment temperature requirement and simple process flow, can be used for nodulizing treatment of the nodular cast iron, particularly the nodulizing treatment of thick and large nodular cast iron, has the characteristics of providing nucleation mass points, improving the nodulizing capability of graphite in molten iron, improving the uniformity of graphite spheres, improving the nodulizing rate and the like, effectively reduces the white cast iron chilling tendency, improves the mechanical properties and the mechanical properties such as tensile strength, impact toughness, wear resistance, hardness and the like of the nodular cast iron, and can produce the nodular cast iron with excellent quality.
2. In the process of preparing the inoculant, the raw materials are firstly crushed and mixed independently, so that the mixing degree of the raw materials is improved, the preparation quality of the inoculant is improved, and then the alloy liquid is subjected to vacuum stirring and ultrasonic strengthening treatment in sequence, so that the mixing degree of the raw material liquid can be further improved, and the preparation quality of the inoculant is further improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below.
The invention relates to an inoculant for nodular cast iron, which comprises the following raw materials in parts by weight: 68.8 parts of H-silicon-aluminum rare earth leftovers, 440 parts of H-silicon cerium-R, 10 parts of silicon calcium, 35.2 parts of aluminum alloy and 6 parts of metal cerium.
In the embodiment, the leftover bits and pieces of H-Si-Al rare earth have Si content of 61.14%, ca content of 1.462%, al content of 3.318%, ce content of 2.08%, H-Si-Ce-R has Si content of 68%, ca content of 1.04%, al content of 0.689%, ce content of 2.275%, si content of 57.58%, ca content of 31.61%, al content of 1.5908%, aluminum content of aluminum alloy of 82%, and cerium content of 98%.
A preparation method of an inoculant for nodular cast iron comprises the following steps:
s1: firstly, accurately weighing raw materials in parts by weight, crushing the raw materials, uniformly mixing the crushed raw materials through a machine, crushing H-silicon-aluminum rare earth leftovers, H-silicon-cerium-R, silicon-calcium, aluminum alloy and metal cerium to 120-140 meshes, and independently crushing and mixing the raw materials, so that the mixing degree of the raw materials is improved, and the preparation quality of the inoculant is improved;
s2: placing the mixture in the S1 into an intermediate frequency furnace, and smelting alloy liquid meeting the component requirements through the intermediate frequency furnace;
s3: the alloy liquid is put into a vacuum stirrer and is stirred uniformly in a vacuum state, the alloy liquid can be mixed more uniformly by stirring in the vacuum state, the effect is better, and the quality of the inoculant can be improved;
s4: then placing the alloy liquid into ultrasonic equipment, and carrying out strengthening treatment on the alloy liquid through ultrasonic waves, wherein the action time of the ultrasonic equipment is set to be 8-10min, the power of the ultrasonic equipment is set to be 1800W, the frequency of the ultrasonic equipment is set to be 25KHz-30KHz, and the ultrasonic waves act on the crystallization process of molten metal, so that metal grains can be obviously refined, alloy components can be uniformly distributed, bubble movement can be accelerated, and the strength and hardness of a metal material can be obviously improved;
the strengthening treatment comprises the following specific steps:
s41: putting the alloy liquid into a liquid container of ultrasonic equipment;
s42: inserting the transmitting head into the alloy liquid, and transmitting ultrasonic waves for processing;
s5: pouring the alloy liquid after the strengthening treatment into a rapid cooling mold to obtain a natural block alloy with the components meeting the requirements;
s6: and crushing the natural block alloy to the required granularity to obtain the inoculant finished product.
The invention adopts the leftovers of H-silicon-aluminum rare earth, H-silicon-cerium-R, silicon-calcium, aluminum alloy and metal cerium to prepare the inoculant, the obtained inoculant for the nodular cast iron is prepared by a high-temperature smelting process, and is assisted with vacuum stirring and ultrasonic strengthening treatment, the multielement phases are combined in a chemical reaction formula manner, the inoculant is applied to the treatment process outside a molten iron furnace, the treatment temperature requirement is low, the process flow is simple, the prepared special inoculant can be used for the inoculation treatment of nodular cast iron parts, particularly after the spheroidization treatment of thick and large nodular cast iron parts, the inoculant has the characteristics of providing nucleation points, improving the graphite sphere forming capability in molten iron, improving the graphite sphere uniformity, improving the spheroidization rate and the like, effectively reducing the chilling tendency, improving the mechanical properties and mechanical properties such as tensile strength, impact toughness, wear resistance and hardness of the nodular cast iron, and being capable of producing the nodular cast iron parts with excellent quality.
The above are only preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made to the technical solutions described in the above embodiments, and to some of the technical features thereof, are included in the scope of the present invention.
Claims (7)
1. The inoculant for the nodular cast iron is characterized in that: the feed comprises the following raw materials in parts by weight: 68.8 parts of H-silicon-aluminum rare earth leftovers, 440 parts of H-silicon cerium-R, 10 parts of silicon calcium, 35.2 parts of aluminum alloy and 6 parts of metal cerium.
2. The inoculant for nodular cast iron according to claim 1, wherein the aluminum content in the aluminum alloy is 82%.
3. The inoculant according to claim 2, wherein the cerium content in the cerium metal is 98%.
4. The method for preparing an inoculant for nodular cast iron as claimed in claim 3, comprising the following steps:
s1: firstly, accurately weighing raw materials in parts by weight, crushing the raw materials, and mechanically and uniformly mixing the crushed raw materials;
s2: placing the mixture in the S1 into an intermediate frequency furnace, and smelting alloy liquid meeting the component requirements through the intermediate frequency furnace;
s3: putting the alloy liquid into a vacuum stirrer, and uniformly stirring under a vacuum state;
s4: then placing the alloy liquid into ultrasonic equipment, and carrying out strengthening treatment on the alloy liquid through ultrasonic waves;
s5: pouring the alloy liquid after the strengthening treatment into a rapid cooling mold to obtain a natural block alloy with the components meeting the requirements;
s6: and crushing the natural block alloy to the required granularity to obtain the inoculant finished product.
5. The inoculant for nodular cast iron and the preparation method thereof according to claim 4, wherein the H-Si-Al rare earth leftovers, H-Si-Ce-R, si-Ca, al alloy and metal Ce in S1 are crushed to 120-140 meshes.
6. The inoculant for nodular cast iron and the preparation method thereof according to claim 5, wherein the specific steps of the strengthening treatment in S4 are as follows:
s41: placing the alloy liquid into a liquid container of ultrasonic equipment;
s42: and inserting the transmitting head into the alloy liquid, and transmitting ultrasonic waves for processing.
7. The inoculant and the preparation method for nodular cast iron as claimed in claim 6, wherein the action time of the ultrasonic equipment in S4 is set to 8-10min, the power of the ultrasonic equipment is set to 1800W, and the frequency of the ultrasonic equipment is set to 25KHz-30KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025992.4A CN115418556A (en) | 2022-08-25 | 2022-08-25 | Inoculant for nodular cast iron and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211025992.4A CN115418556A (en) | 2022-08-25 | 2022-08-25 | Inoculant for nodular cast iron and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000140677A (en) * | 1998-11-05 | 2000-05-23 | Nippon Solid Co Ltd | Method of crushing/mixing solid particles by ultrasonic waves |
| US20010024622A1 (en) * | 2000-02-16 | 2001-09-27 | Van Eldijk Pieter Cornelis | Process for producing nodular cast iron, and casting produced using this process |
| US20180148805A1 (en) * | 2015-05-18 | 2018-05-31 | Toshiba Kikai Kabushiki Kaisha | Method for treating molten cast iron |
| CN110983165A (en) * | 2019-12-31 | 2020-04-10 | 三祥新材股份有限公司 | Inoculant for nodular cast iron and preparation method thereof |
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2022
- 2022-08-25 CN CN202211025992.4A patent/CN115418556A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000140677A (en) * | 1998-11-05 | 2000-05-23 | Nippon Solid Co Ltd | Method of crushing/mixing solid particles by ultrasonic waves |
| US20010024622A1 (en) * | 2000-02-16 | 2001-09-27 | Van Eldijk Pieter Cornelis | Process for producing nodular cast iron, and casting produced using this process |
| US20180148805A1 (en) * | 2015-05-18 | 2018-05-31 | Toshiba Kikai Kabushiki Kaisha | Method for treating molten cast iron |
| CN110983165A (en) * | 2019-12-31 | 2020-04-10 | 三祥新材股份有限公司 | Inoculant for nodular cast iron and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 彭万金;: "超声波在冶金中的应用研究", 上海有色金属, vol. 29, no. 03, pages 135 - 139 * |
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