CN104195415A - Preparation method and application of grey cast iron inoculant - Google Patents
Preparation method and application of grey cast iron inoculant Download PDFInfo
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- CN104195415A CN104195415A CN201410405114.4A CN201410405114A CN104195415A CN 104195415 A CN104195415 A CN 104195415A CN 201410405114 A CN201410405114 A CN 201410405114A CN 104195415 A CN104195415 A CN 104195415A
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- nucleating agent
- molten iron
- cast iron
- 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 grey cast iron inoculant. The formula of the grey cast iron inoculant comprises the following components in percentage by weight: 66-70% of Si, 1-3% of Zr, 1-2% of Ca, 0-2.5% of Mn, 0.5-1.5% of Fe3O4 and the balance of Fe and inevitable trace elements. By adopting the grey cast iron inoculant disclosed by the invention, the comprehensive performance of the grey cast iron can be improved, and the inoculating efficiency is improved.
Description
Technical field
The present invention relates to casting field, relate in particular to a kind of graphitic cast iron nucleating agent and preparation method, with and in the application of casting field.
Background technology
Nucleating agent has 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 has obtained application widely at casting iron field.
The cocrystallizing type alloy that graphitic cast iron is made up of iron, carbon and silicon on 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, because of its good castibility, and good wear resistance, good machinability, any surface finish, weakening is high, and low notch sensitivity has obtained application widely at industrial circle.
At present, most of manufacturers are used 75 ferrosilicon nucleating agents 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 inhomogeneous, easily produce the shortcomings such as spoken parts in traditional operas, cause product unstable, can not meet the requirement of the machinery casting of some needs high rigidity.
In order to improve above-mentioned deficiency, part producer starts to increase other material in ferrosilicon nucleating agent and prepares composite inoculant, as chromium, copper etc., but, in the time adding above-mentioned materials, can introduce new problem.As add chromium and will increase the probability that white structure forms, and then cause gray iron hardness to decline, and add copper and not only can not get good effect improving gray iron aspect of performance, greatly increase on the contrary the cost of preparing nucleating agent.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, proposed a kind of pregnant effect good, breed the nucleating agent that the incubation time, wear resistance, tensile strength, section degree of uniformity of rear graphitic cast iron all significantly improve.
Another object of the present invention is to provide a kind of preparation method of above-mentioned graphitic cast iron nucleating agent.
A further object of the present invention is to provide the application of a kind of above-mentioned graphitic cast iron nucleating agent aspect 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:1～3%, Ca:1～2%, Mn:0～2.5%, Fe
3o
4: 0.5～1.5%, surplus is Fe and inevitably micro-.
Above-mentioned cast iron nucleating agent, in preferred technical scheme, 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%, surplus is Fe and inevitably micro-.
Above-mentioned graphitic cast iron nucleating agent, in preferred technical scheme, further comprises 0～1.4% Al by weight percentage.
The preparation method of above-mentioned graphitic cast iron nucleating agent comprises the following steps:
(1) 66～70% Si by mass percentage, 1～3% Zr, 1～2% Ca, 0～2.5% Mn, 0～1.4% Al, Fe
3o
4: 0.5～1.5% and surplus be Fe and inevitably trace element mix, pulverize;
(2) alloy raw material of pulverizing is put into vacuum unit after evenly, be warming up to 1300 DEG C to 1500 DEG C so that each raw material is melted, mechanical stirring is even;
(3) pour into block, and block is ground into the powdered alloy that median size is 200～500 μ m.
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 1:0.04～0.08, in the time of smelting cast iron, the same with common production, only need, in the time supplementing molten iron, packaged graphitic cast iron nucleating agent be added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, molten iron is covered with heat preserving agent, 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 improve the mobility of iron liquid, can alleviate the chilling tendency of cast iron, facilitates 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 can be used as the external nucleus of iron liquid graphite crystallization, promotes 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 forms;
6, Mn is that a kind of anti-graphite is stablized refine pearlite element, and its content is in 1% left and right, and its effect is and increases crystallization nuclei, improves pregnant effect
7, Ca belongs to alkaline-earth metal, and Ca can generate oxide compound, sulfide, nitride, material in slag making purifying molten iron and formation nucleus;
8, the Al of low levels and Ca have guaranteed that its slag producing in the time adding in molten iron is minimum;
9, by adding Fe
3o
4can increase eutectic check figure, can in the situation that nucleating agent addition is low, obtain the ability that suppresses preferably iron carbide, and improve repetition rate and stability, extend the incubation time.
10, (200～500 μ m) can be dispersed in molten iron the nucleating agent structure of refinement, increase the contact area of its residual molten steel, improve inoculation efficiency.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1 (preparation)
66% Si by weight percentage, 3% Zr, 2% Ca, 2.5% Mn, 1.5% Fe
3o
4, after mixing, 1.4% Al and 23.6% Fe put into vacuum unit, be warming up to 1300 DEG C, and 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 μ m.
Embodiment 2 (preparation)
70% Si by weight percentage, 1% Zr, 1% Ca, 0.5% Fe
3o
4, after mixing, 0.2% Al and 27.3% Fe put into vacuum unit, be warming up to 1500 DEG C, and 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 μ m.
Embodiment 3 (preparation)
68% Si by weight percentage, 2% Zr, 1.6% Ca, 1% Mn, 1% Fe
3o
4, after mixing, 0.8% Al and 25.6% Fe put into vacuum unit, be warming up to 1350 DEG C, and 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 μ m.
Embodiment 4 (preparation)
68% Si by weight percentage, 1.5% Zr, 1.2% Ca, 1.5% Mn, 0.8% Fe
3o
4, after mixing, 1.2% Al and 25.8% Fe put into vacuum unit, be warming up to 1450 DEG C, and after each raw material melts, mechanical stirring is even; Pour into block, and block is ground into the powdered alloy that median size is 400 μ m.
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 1:0.04, the same with common production in the time of smelting cast iron, only need be in the time supplementing molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, and molten iron covered with heat preserving agent, 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 1:0.08, the same with common production in the time of smelting cast iron, only need be in the time supplementing molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, and molten iron covered with heat preserving agent, pourable.
Embodiment 7 (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 in the time of smelting cast iron, only need be in the time supplementing molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, and molten iron covered with heat preserving agent, pourable.
Embodiment 8 (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 in the time of smelting cast iron, only need be in the time supplementing molten iron, packaged graphitic cast iron nucleating agent is added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, and molten iron covered with heat preserving agent, pourable.
Claims (6)
1. a graphitic cast iron nucleating agent, is characterized in that, its formula comprises by weight percentage: Si:66～70%, Zr:1～3%, Ca:1～2%, Mn:0～2.5%, Fe
3o
4: 0.5～1.5%, surplus is Fe and inevitably micro-.
2. graphitic cast iron nucleating agent according to claim 1, 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%, surplus is Fe and inevitably micro-.
3. graphitic cast iron nucleating agent according to claim 1 and 2, is characterized in that, further comprises 0～1.4% Al by weight percentage.
4. a preparation method for the graphitic cast iron nucleating agent described in claim 1 or 2, is characterized in that, comprises the following steps:
(1) 66～70% Si by mass percentage, 1～3% Zr, 1～2% Ca, 0～2.5% Mn, 0～1.4% Al, Fe
3o
4: 0.5～1.5% and surplus be Fe and inevitably trace element mix, pulverize;
(2) alloy raw material of pulverizing is put into vacuum melting furnace after evenly, be warming up to 1300 DEG C to 1500 DEG C so that each raw material is melted, mechanical stirring is even;
(3) pour into block, and block is ground into the powdered alloy that median size is 200～500 μ m.
5. the application of the graphitic cast iron nucleating agent described in a claim 1 or 2 in foundry goods, the ratio that it is characterized in that molten iron and nucleating agent is 1:0.04～0.08, in the time smelting foundry goods, the same with common production, only need, in the time supplementing molten iron, packaged graphitic cast iron nucleating agent be added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, molten iron is covered with heat preserving agent, pourable.
6. the application of graphitic cast iron nucleating agent according to claim 5 in foundry goods, the ratio that it is characterized in that molten iron and nucleating agent is 1:0.05～0.07, in the time smelting foundry goods, the same with common production, only need, in the time supplementing molten iron, packaged graphitic cast iron nucleating agent be added with molten iron stream, molten iron is after rolling by after in bag, molten iron stirs, molten iron is covered with heat preserving agent, pourable.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405114.4A CN104195415A (en) | 2014-08-18 | 2014-08-18 | Preparation method and application of grey cast iron inoculant |
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| Publication Number | Publication Date |
|---|---|
| CN104195415A true CN104195415A (en) | 2014-12-10 |
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| CN201410405114.4A Pending CN104195415A (en) | 2014-08-18 | 2014-08-18 | Preparation method and application of grey cast iron inoculant |
| CN201510362563.XA Pending 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 |
|---|---|---|---|---|
| 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 |
| CN110396638A (en) * | 2019-07-10 | 2019-11-01 | 广西大学 | A kind of inovulant of gray cast iron and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238988B (en) * | 2015-10-30 | 2017-04-19 | 成都宏源铸造材料有限公司 | Preparing method and application of gray iron inoculant |
-
2014
- 2014-08-18 CN CN201410405114.4A patent/CN104195415A/en active Pending
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- 2015-06-26 CN CN201510362563.XA patent/CN104946958A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110396638A (en) * | 2019-07-10 | 2019-11-01 | 广西大学 | A kind of inovulant of gray cast iron and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN104946958A (en) | 2015-09-30 |
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Application publication date: 20141210 |