CN104946958A - Preparation method and application of gray pig iron inoculant - Google Patents
Preparation method and application of gray pig iron inoculant Download PDFInfo
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- CN104946958A CN104946958A CN201510362563.XA CN201510362563A CN104946958A CN 104946958 A CN104946958 A CN 104946958A CN 201510362563 A CN201510362563 A CN 201510362563A CN 104946958 A CN104946958 A CN 104946958A
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- nucleating agent
- molten iron
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a gray pig iron inoculant which is characterized in that the formula of the gray pig iron inoculant comprises the ingredients by weight percentage: 66-70% of Si, 2-3% of Zr, 1.4-1.6% of Ca, 1-2% of Mn, 0.5-1.5% of Fe3O4, and the balance being Fe and unavoidable trace elements. With the adoption of the gray pig iron inoculant, the comprehensive performance of gray pig iron can be improved, and the inoculation efficiency can be improved.
Description
Technical field
The present invention relates to casting field, particularly relate to a kind of graphitic cast iron nucleating agent and preparation method, and it is in the application of casting field.
Background technology
Nucleating agent has and can promote greying, reduce chilling tendency, improve graphite form and distribution situation, increase eutectic cell quantity, refinement matrix, make Graphite Particles in Spheroidal Graphite Cast Iron rounding, reduce or eliminate Quench, prevent the formation of surperficial free cementite, uniform formation, improve the advantages such as mechanical property, it obtains at casting iron field and applies widely.
The cocrystallizing type alloy that graphitic cast iron is made up of iron, carbon and silicon substantially, wherein, carbon mainly exists with the form of graphite.Graphitic cast iron is application one of cast iron materials very widely of casting iron field, and because of the castibility that it is good, good wear resistance, good machinability, any surface finish, weakening is high, low notch sensitivity, obtains apply widely at industrial circle.
At present, most of manufacturer uses 75 silicon iron inoculator to produce graphitic cast iron as nucleating agent, but these products exist the incubation time short, wear no resistance, hardness is low, tensile strength is low, section is uneven, the shortcomings such as easy generation spoken parts in traditional operas, cause product unstable, the requirement of the machinery casting of some needs high rigidity can not be met.
In order to improve above-mentioned deficiency, part producer starts in silicon iron inoculator, increase other material and prepares composite inoculant, as chromium, copper etc., but, when adding above-mentioned materials, new problem can be introduced.To increase as added chromium the probability that white structure formed, and and then causing gray iron hardness to decline, interpolation copper not only can not get good effect improving gray iron aspect of performance, considerably increases the cost preparing nucleating agent on the contrary.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose a kind of pregnant effect good, breed the incubation time of rear graphitic cast iron, nucleating agent that wear resistance, tensile strength, section degree of uniformity all significantly improve.
Another object of the present invention is to the preparation method that a kind of above-mentioned graphitic cast iron nucleating agent is provided.
Another object of the present invention is to provide the application of a kind of above-mentioned graphitic cast iron nucleating agent in casting.
For achieving the above object, the present invention takes following technical scheme:
A kind of graphitic cast iron nucleating agent, its formula comprises by weight percentage: Si:66 ~ 70%, Zr:2 ~ 3%, Ca:1.4 ~ 1.6%, Mn:1 ~ 2%, Fe
3o
4: 0.5 ~ 1.5% and surplus be Fe and inevitably trace element.
Above-mentioned graphitic cast iron nucleating agent, in preferred technical scheme, comprises the Al of by weight percentage 0 ~ 1.4% further.
The preparation method of above-mentioned graphitic cast iron nucleating agent comprises the following steps:
(1) by mass percentage 66 ~ 70% Si, the Zr of 2 ~ 3%, the Ca of 1.4 ~ 1.6%, the Mn of 1 ~ 2%, the Al of 0 ~ 1.4%, Fe
3o
4: 0.5 ~ 1.5% and surplus be Fe and inevitably trace element mix, pulverize;
(2) by the alloy raw material of pulverizing evenly after put into vacuum unit, be warming up to 1300 DEG C to 1500 DEG C and melt to make each raw material, mechanical stirring is even;
(3) pour into block, and block is ground into the powdered alloy that median size is 200 ~ 500 μm.
The application of above-mentioned graphitic cast iron nucleating agent in cast iron, the ratio of molten iron and graphitic cast iron nucleating agent is 1:0.05 ~ 0.07, when smelting cast iron, the same with common production, only when supplementary molten iron, need be added by packaged graphitic cast iron nucleating agent with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, with heat preserving agent, molten iron is covered, namely pourable.
Above-mentioned graphitic cast iron nucleating agent technical scheme provided by the invention has following beneficial effect:
1, Zr has desoxydatoin, is conducive to the mobility improving iron liquid, can alleviates the chilling tendency of cast iron, facilitate all tiny A type graphite;
2, Si, Al, Zr generate nitride, reduce excessive dissolved nitrogen content, organize the reversible suction nitrogen of molten iron, suppress inoculation fade, prevent chilling tendency;
3, SiO
2crystal as the external nucleus of iron liquid graphite crystallization, can promote the formation of A type graphite;
4, Si, Al, Zr can reduce nucleating agent fusing point, and because the low instantaneous diffusion of fusing point is fast, pregnant effect is better;
5, Al content reduces the possibility that pin hole is formed;
6, Mn is a kind of anti-graphite stable refine pearlite element, and its content is about 1%, and its effect is and increase crystallization nuclei, improves pregnant effect
7, Ca belongs to alkaline-earth metal, and Ca can generate oxide compound, sulfide, nitride, slag making purifying molten iron and material in formation nucleus;
8, Al and Ca of low levels ensure that the slag that it produces when adding in molten iron is minimum;
9, by adding Fe
3o
4eutectic check figure can be increased, the ability suppressing iron carbide preferably can be obtained when nucleating agent addition is low, and improve repetition rate and stability, extend the incubation time.
10, the nucleating agent structure (200 ~ 500 μm) of refinement can be dispersed in molten iron, increases the contact area of its residual molten steel, improves inoculation efficiency.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1 (preparation)
The Si of 66% by weight percentage, the Zr of 3%, the Ca of 1.6%, the Mn of 2%, the Fe of 1.5%
3o
4, put into vacuum unit after the Al of the 1.4% and Fe of 24.5% mixes, be warming up to 1300 DEG C, after each raw material melts, mechanical stirring is even; Pour into block, and block is ground into the powdered alloy that median size is 200 μm.
Embodiment 2 (preparation)
The Si of 70% by weight percentage, the Zr of 2%, the Ca of 1.4%, the Mn of 1%, the Fe of 0.5%
3o
4and the Fe of 25.1% mix after put into vacuum unit, be warming up to 1500 DEG C, after each raw material melts, mechanical stirring is even; Pour into block, and block is ground into the powdered alloy that median size is 500 μm.
Embodiment 3 (preparation)
The Si of 68% by weight percentage, the Zr of 2.5%, the Ca of 1.5%, the Mn of 1.5%, the Fe of 1%
3o
4, put into vacuum unit after the Al of the 0.8% and Fe of 24.7% mixes, be warming up to 1400 DEG C, after each raw material melts, mechanical stirring is even; Pour into block, and block is ground into the powdered alloy that median size is 300 μm.
Embodiment 4 (application)
Graphitic cast iron nucleating agent is as the application of casting iron field, the ratio of its molten iron and nucleating agent is 1:0.06, the same with common production when smelting cast iron, only need when supplementary molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron by after in bag, molten iron stirs, covers with heat preserving agent by molten iron after rolling, namely pourable.
Embodiment 5 (application)
Graphitic cast iron nucleating agent is as the application of casting iron field, the ratio of its molten iron and nucleating agent is 1:0.05, the same with common production when smelting cast iron, only need when supplementary molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron by after in bag, molten iron stirs, covers with heat preserving agent by molten iron after rolling, namely pourable.
Embodiment 6 (application)
Graphitic cast iron nucleating agent is as the application of casting iron field, the ratio of its molten iron and nucleating agent is 1:0.07, the same with common production when smelting cast iron, only need when supplementary molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron by after in bag, molten iron stirs, covers with heat preserving agent by molten iron after rolling, namely pourable.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (4)
1. a graphitic cast iron nucleating agent, is characterized in that, its formula comprises by weight percentage: Si:66 ~ 70%, Zr:2 ~ 3%, Ca:1.4 ~ 1.6%, Mn:1 ~ 2%, Fe
3o
4: 0.5 ~ 1.5% and surplus be Fe and inevitably trace element.
2. graphitic cast iron nucleating agent according to claim 1, is characterized in that, comprises the Al of by weight percentage 0 ~ 1.4% further.
3. a preparation method for the graphitic cast iron nucleating agent described in claim 1 or 2, is characterized in that, comprise the following steps:
(1) by mass percentage 66 ~ 70% Si, the Zr of 2 ~ 3%, the Ca of 1.4 ~ 1.6%, the Mn of 1 ~ 2%, the Al of 0 ~ 1.4%, Fe
3o
4: 0.5 ~ 1.5% and surplus be Fe and inevitably trace element mix, pulverize;
(2) by the alloy raw material of pulverizing evenly after put into vacuum melting furnace, be warming up to 1300 DEG C to 1500 DEG C and melt to make each raw material, mechanical stirring is even;
(3) pour into block, and block is ground into the powdered alloy that median size is 200 ~ 500 μm.
4. the application of graphitic cast iron nucleating agent in foundry goods described in a claim 1 or 2, it is characterized in that the ratio of molten iron and nucleating agent is 1:0.05 ~ 0.07, when smelting foundry goods, the same with common production, only when supplementary molten iron, need be added by packaged graphitic cast iron nucleating agent with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, with heat preserving agent, molten iron is covered, namely pourable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510362563.XA CN104946958A (en) | 2014-08-18 | 2015-06-26 | Preparation method and application of gray pig iron inoculant |
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|---|---|---|---|
| CN2014104051144 | 2014-08-18 | ||
| CN201410405114.4A CN104195415A (en) | 2014-08-18 | 2014-08-18 | Preparation method and application of grey cast iron inoculant |
| CN201510362563.XA CN104946958A (en) | 2014-08-18 | 2015-06-26 | Preparation method and application of gray pig iron inoculant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238988A (en) * | 2015-10-30 | 2016-01-13 | 成都宏源铸造材料有限公司 | Preparing method and application of gray iron inoculant |
| CN105238987A (en) * | 2015-10-30 | 2016-01-13 | 成都宏源铸造材料有限公司 | Preparation method and application of gray pig iron nucleating agent |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396638A (en) * | 2019-07-10 | 2019-11-01 | 广西大学 | A kind of inovulant of gray cast iron and preparation method thereof |
-
2014
- 2014-08-18 CN CN201410405114.4A patent/CN104195415A/en active Pending
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2015
- 2015-06-26 CN CN201510362563.XA patent/CN104946958A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238988A (en) * | 2015-10-30 | 2016-01-13 | 成都宏源铸造材料有限公司 | Preparing method and application of gray iron inoculant |
| CN105238987A (en) * | 2015-10-30 | 2016-01-13 | 成都宏源铸造材料有限公司 | Preparation method and application of gray pig iron nucleating agent |
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| CN104195415A (en) | 2014-12-10 |
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Application publication date: 20150930 |
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