CN113278758A - Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof - Google Patents
Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof Download PDFInfo
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- CN113278758A CN113278758A CN202110420919.6A CN202110420919A CN113278758A CN 113278758 A CN113278758 A CN 113278758A CN 202110420919 A CN202110420919 A CN 202110420919A CN 113278758 A CN113278758 A CN 113278758A
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- inoculant
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
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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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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses an inoculant for thin-wall ferrite nodular cast iron, which comprises the following chemical components in percentage by mass: the invention also provides a preparation method of the inoculant for the thin-wall ferrite nodular cast iron, which comprises the following steps of S1: proportioning; s2: mixing materials; s3: smelting; s4: cooling; s5: the casting iron is crushed, the metal aluminum, the metal chromium, the metal strontium, the metal bismuth, the metal barium and the 75B ferrosilicon are added into the cast iron, the bismuth element is utilized to reduce and decompose the phosphorus eutectic crystal so as to inhibit the white cast effect of the casting, the section sensitivity of the casting is reduced, and meanwhile, the source of the material is optimized and the content of the aluminum and the content of the calcium are controlled in the proportion, so that the adverse effect on the fluidity of the cast iron liquid is effectively avoided, and the finished product quality of the casting is improved to a certain extent.
Description
Technical Field
The invention relates to the technical field of inoculant preparation, in particular to an inoculant for thin-wall ferrite nodular cast iron and a preparation method of the inoculant for the thin-wall ferrite nodular cast iron.
Background
The inoculant can promote graphitization, reduce chilling tendency, improve graphite morphology and distribution, increase eutectic cell number, and refine matrix structure, and has good effect in a short time after inoculation. The inoculation treatment is that a small amount of other substances are added into liquid metal in the solidification process to promote nucleation and inhibit growth so as to achieve the purpose of refining grains. Conventionally, the addition of additives to cast iron is called inoculation; the addition of additives to the non-ferrous alloys is called a modification treatment. Essentially, inoculation mainly affects nucleation and promotes grain dissociation; the modification treatment changes the growth mechanism of the crystal, thereby influencing the appearance of the crystal.
The common cast iron inoculant is generally inoculated by using a ferrosilicon inoculant, the alloy content in molten iron is high in the process of thin-wall ferrite nodular cast iron, the liquid fluidity of the molten iron is easily reduced, the inoculation effect is difficult to keep stable, and castings with poor quality appear.
Disclosure of Invention
The invention aims to provide an inoculant for thin-wall ferrite nodular cast iron and a preparation method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an inoculant for thin-wall ferrite nodular cast iron comprises the following chemical components in percentage by mass: 60 to 65 percent of Si, 1 to 2.5 percent of Ba, 9 to 12 percent of Cr, 0.1 to 0.5 percent of Al, 0.5 to 0.8 percent of Bi, 1 to 1.2 percent of Ca, 0.3 to 0.5 percent of Sr, and the balance of Fe.
Preferably, the elements Si, Fe and Ca are selected from 75B ferrosilicon, wherein the Si content is 72-78%, the Al content is 1-3%, the Fe content is 30-35%, and the Ca content is less than 1%.
Preferably, the Al element is derived from metallic aluminum, the Cr element is derived from metallic chromium, the Sr element is derived from metallic strontium, the Bi element is derived from metallic bismuth, and the Ba element is derived from barium alloy.
The invention also provides a preparation method of the inoculant for the thin-wall ferrite nodular cast iron, which comprises the following steps:
s1, proportioning, weighing metal aluminum, metal chromium, metal strontium, metal bismuth, barium alloy and 75B ferrosilicon according to mass percentage, and respectively crushing into small pieces;
s2, mixing materials, namely mixing the crushed raw materials, and filling all metal fragments into a mixing device in sequence during the mixing;
and S3, smelting, namely feeding the mixed metal raw material fragments into a frequency induction electric furnace for smelting, wherein the smelting temperature is 1400-1500 ℃, the smelting time is controlled to be 25-35 min, and stirring is continuously carried out in the smelting process to force the raw materials to fully finish smelting.
S4, cooling, pouring the smelted slurry into a water-cooling model, and introducing inert protective gas;
and S5, crushing the formed cast ingot after cooling, granulating by a granulator, and storing to finish the preparation work.
Preferably, the average grain diameter of the ingot casting granulation in the S5 is 300-500 μm.
Preferably, the casting temperature in the S4 is 1450-1550 ℃.
Preferably, the crushed metal raw material in the step S1 is screened into metal fragments with the diameter of 10 mm-15 mm.
Preferably, the inert shielding gas in S4 is nitrogen.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, metal aluminum, metal chromium, metal strontium, metal bismuth, metal barium and 75B ferrosilicon are added into cast iron, bismuth is used for reducing and decomposing phosphorus eutectic to inhibit the white cast effect of the casting, the section sensitivity of the casting is reduced, and meanwhile, the source of the material is optimized and the content of aluminum and calcium is controlled in the proportion, so that adverse effects on the fluidity of the cast iron liquid are effectively avoided, and the finished product quality of the casting is improved to a certain extent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An inoculant for thin-wall ferrite nodular cast iron is characterized in that: the inoculant comprises the following chemical components in percentage by mass: 60% of Si, 1% of Ba, 9% of Cr, 0.1% of Al, 0.5% of Bi, 1% of Ca, 0.3% of Sr and 28.1% of Fe.
Specifically, the elements Si, Fe and Ca are selected from 75B ferrosilicon, wherein the content of Si is 72-78%, the content of Al is 1-3%, the content of Fe is 30-35%, and the content of Ca is lower than 1%.
Specifically, the Al element is derived from metallic aluminum, the Cr element is derived from metallic chromium, the Sr element is derived from metallic strontium, the Bi element is derived from metallic bismuth, and the Ba element is derived from barium alloy.
The invention also provides a preparation method of the inoculant for the thin-wall ferrite nodular cast iron, which comprises the following steps:
s1, proportioning, weighing metal aluminum, metal chromium, metal strontium, metal bismuth, barium alloy and 75B ferrosilicon according to mass percentage, and respectively crushing into small pieces;
s2, mixing materials, namely mixing the crushed raw materials, and filling all metal fragments into a mixing device in sequence during the mixing;
and S3, smelting, namely feeding the mixed metal raw material fragments into a frequency induction electric furnace for smelting, wherein the smelting temperature is 1400 ℃, the smelting time is controlled to be 25min, and stirring is continuously carried out in the smelting process to force the raw materials to fully finish smelting.
S4, cooling, pouring the smelted slurry into a water-cooling model, and introducing inert protective gas;
and S5, crushing the formed cast ingot after cooling, granulating by using a granulator, and storing to finish the preparation work.
Specifically, the average grain diameter of the ingot casting granulation in the S5 is 300-500 μm.
Specifically, the casting temperature in the step S4 is 1450-1550 ℃.
Specifically, the crushed metal raw material in the step S1 is screened into metal fragments with the diameter of 10 mm-15 mm.
Specifically, the inert shielding gas in S4 is nitrogen.
Example 2
An inoculant for thin-wall ferrite nodular cast iron is characterized in that: the inoculant comprises the following chemical components in percentage by mass: 65% of Si, 2.5% of Ba, 12% of Cr, 0.5% of Al, 0.8% of Bi, 1.2% of Ca, 0.5% of Sr and 17.5% of Fe.
Specifically, the elements Si, Fe and Ca are selected from 75B ferrosilicon, wherein the content of Si is 72-78%, the content of Al is 1-3%, the content of Fe is 30-35%, and the content of Ca is lower than 1%.
Specifically, the Al element is derived from metallic aluminum, the Cr element is derived from metallic chromium, the Sr element is derived from metallic strontium, the Bi element is derived from metallic bismuth, and the Ba element is derived from barium alloy.
The invention also provides a preparation method of the inoculant for the thin-wall ferrite nodular cast iron, which comprises the following steps:
s1, proportioning, weighing metal aluminum, metal chromium, metal strontium, metal bismuth, barium alloy and 75B ferrosilicon according to mass percentage, and respectively crushing into small pieces;
s2, mixing materials, namely mixing the crushed raw materials, and filling all metal fragments into a mixing device in sequence during the mixing;
and S3, smelting, namely feeding the mixed metal raw material fragments into a frequency induction electric furnace for smelting, wherein the smelting temperature is 1450 ℃, the smelting time is controlled to be 35min, and stirring is continuously carried out in the smelting process to force the raw materials to fully finish smelting.
S4, cooling, pouring the smelted slurry into a water-cooling model, and introducing inert protective gas;
and S5, crushing the formed cast ingot after cooling, granulating by using a granulator, and storing to finish the preparation work.
Specifically, the average grain diameter of the ingot casting granulation in the S5 is 300-500 μm.
Specifically, the casting temperature in the step S4 is 1450-1550 ℃.
Specifically, the crushed metal raw material in the step S1 is screened into metal fragments with the diameter of 10 mm-15 mm.
Specifically, the inert shielding gas in S4 is nitrogen.
Example 3
An inoculant for thin-wall ferrite nodular cast iron is characterized in that: the inoculant comprises the following chemical components in percentage by mass: 62% of Si, 1.5% of Ba, 10% of Cr, 0.5% of Al, 0.7% of Bi, 1.2% of Ca, 0.5% of Sr and 23.6% of Fe.
Specifically, the elements Si, Fe and Ca are selected from 75B ferrosilicon, wherein the content of Si is 72-78%, the content of Al is 1-3%, the content of Fe is 30-35%, and the content of Ca is lower than 1%.
Specifically, the Al element is derived from metallic aluminum, the Cr element is derived from metallic chromium, the Sr element is derived from metallic strontium, the Bi element is derived from metallic bismuth, and the Ba element is derived from barium alloy.
The invention also provides a preparation method of the inoculant for the thin-wall ferrite nodular cast iron, which comprises the following steps:
s1, proportioning, weighing metal aluminum, metal chromium, metal strontium, metal bismuth, barium alloy and 75B ferrosilicon according to mass percentage, and respectively crushing into small pieces;
s2, mixing materials, namely mixing the crushed raw materials, and filling all metal fragments into a mixing device in sequence during the mixing;
and S3, smelting, namely feeding the mixed metal raw material fragments into a frequency induction electric furnace for smelting, wherein the smelting temperature is 1500 ℃, the smelting time is controlled to be 30min, and stirring is continuously carried out in the smelting process to force the raw materials to fully finish smelting.
S4, cooling, pouring the smelted slurry into a water-cooling model, and introducing inert protective gas;
and S5, crushing the formed cast ingot after cooling, granulating by using a granulator, and storing to finish the preparation work.
Specifically, the average grain diameter of the ingot casting granulation in the S5 is 300-500 μm.
Specifically, the casting temperature in the step S4 is 1450-1550 ℃.
Specifically, the crushed metal raw material in the step S1 is screened into metal fragments with the diameter of 10 mm-15 mm.
Specifically, the inert shielding gas in S4 is nitrogen.
According to the invention, metal aluminum, metal chromium, metal strontium, metal bismuth, metal barium and 75B ferrosilicon are added into cast iron, bismuth is used for reducing and decomposing phosphorus eutectic to inhibit the white cast effect of the casting, the section sensitivity of the casting is reduced, and meanwhile, the source of the material is optimized and the content of aluminum and calcium is controlled in the proportion, so that adverse effects on the fluidity of the cast iron liquid are effectively avoided, and the finished product quality of the casting is improved to a certain extent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. An inoculant for thin-wall ferrite nodular cast iron is characterized in that: the inoculant comprises the following chemical components in percentage by mass: 60 to 65 percent of Si, 1 to 2.5 percent of Ba, 9 to 12 percent of Cr, 0.1 to 0.5 percent of Al, 0.5 to 0.8 percent of Bi, 1 to 1.2 percent of Ca, 0.3 to 0.5 percent of Sr, and the balance of Fe.
2. The inoculant for thin-walled ferritic spheroidal graphite cast iron according to claim 1, wherein: the Si, Fe and Ca elements are taken from 75B ferrosilicon, wherein the Si content is 72-78%, the Al content is 1-3%, the Fe content is 30-35%, and the Ca content is lower than 1%.
3. The inoculant for thin-walled ferritic spheroidal graphite cast iron according to claim 1, wherein: the Al element is derived from metal aluminum, the Cr element is derived from metal chromium, the Sr element is derived from metal strontium, the Bi element is derived from metal bismuth, and the Ba element is derived from barium alloy.
4. The method for preparing the inoculant for the thin-walled ferritic spheroidal graphite cast iron according to claim 1, wherein the inoculant comprises the following components in percentage by weight: the method comprises the following steps:
s1, proportioning, weighing metal aluminum, metal chromium, metal strontium, metal bismuth, barium alloy and 75B ferrosilicon according to mass percentage, and respectively crushing into small pieces;
s2, mixing materials, namely mixing the crushed raw materials, and filling all metal fragments into a mixing device in sequence during the mixing;
and S3, smelting, namely feeding the mixed metal raw material fragments into a frequency induction electric furnace for smelting, wherein the smelting temperature is 1400-1500 ℃, the smelting time is controlled to be 25-35 min, and stirring is continuously carried out in the smelting process to force the raw materials to fully finish smelting.
S4, cooling, pouring the smelted slurry into a water-cooling model, and introducing inert protective gas;
and S5, crushing the formed cast ingot after cooling, granulating by a granulator, and storing to finish the preparation work.
5. The method for preparing the inoculant for the thin-wall ferritic spheroidal graphite cast iron according to claim 4, wherein the inoculant comprises the following components in percentage by weight: the average grain diameter of the ingot casting pelletization in the S5 is 300-500 mu m.
6. The method for preparing the inoculant for the thin-wall ferritic spheroidal graphite cast iron according to claim 4, wherein the inoculant comprises the following components in percentage by weight: the casting temperature in the S4 is 1450-1550 ℃.
7. The method for preparing the inoculant for the thin-wall ferritic spheroidal graphite cast iron according to claim 4, wherein the inoculant comprises the following components in percentage by weight: and screening the crushed metal raw material in the S1 into metal fragments with the diameter of 10-15 mm.
8. The method for preparing the inoculant for the thin-wall ferritic spheroidal graphite cast iron according to claim 4, wherein the inoculant comprises the following components in percentage by weight: the inert shielding gas in the S4 is nitrogen.
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| CN202110420919.6A CN113278758A (en) | 2021-04-19 | 2021-04-19 | Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof |
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| CN202110420919.6A CN113278758A (en) | 2021-04-19 | 2021-04-19 | Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146985A (en) * | 2013-04-07 | 2013-06-12 | 山东汇丰铸造科技股份有限公司 | Inoculant for ferritic nodular cast iron and preparation method of inoculant |
| CN107619988A (en) * | 2017-08-31 | 2018-01-23 | 安徽信息工程学院 | Thin-walled ferrite ductile cast iron inovulant and preparation method thereof |
| JPWO2016186094A1 (en) * | 2015-05-18 | 2018-04-12 | 東芝機械株式会社 | Cast iron melt processing method |
| CN109811247A (en) * | 2019-03-20 | 2019-05-28 | 江苏亚峰合金材料有限公司 | A kind of cast iron bismuth-containing inovulant and preparation method thereof |
-
2021
- 2021-04-19 CN CN202110420919.6A patent/CN113278758A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146985A (en) * | 2013-04-07 | 2013-06-12 | 山东汇丰铸造科技股份有限公司 | Inoculant for ferritic nodular cast iron and preparation method of inoculant |
| JPWO2016186094A1 (en) * | 2015-05-18 | 2018-04-12 | 東芝機械株式会社 | Cast iron melt processing method |
| CN107619988A (en) * | 2017-08-31 | 2018-01-23 | 安徽信息工程学院 | Thin-walled ferrite ductile cast iron inovulant and preparation method thereof |
| CN109811247A (en) * | 2019-03-20 | 2019-05-28 | 江苏亚峰合金材料有限公司 | A kind of cast iron bismuth-containing inovulant and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 张文和等: "几种孕育剂简介", 《现代铸铁》 * |
| 袁征峰等: "LCBA薄壁铸态全铁素体球铁孕育剂的研制", 《铸造设备研究》 * |
| 马晓丽等: "薄壁球墨铸铁白口组织的形成及影响石墨化的因素", 《热加工工艺》 * |
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