CN102277523B - Fe-X-C crystal grain refiner and preparation method thereof - Google Patents
Fe-X-C crystal grain refiner and preparation method thereof Download PDFInfo
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- CN102277523B CN102277523B CN201110161142A CN201110161142A CN102277523B CN 102277523 B CN102277523 B CN 102277523B CN 201110161142 A CN201110161142 A CN 201110161142A CN 201110161142 A CN201110161142 A CN 201110161142A CN 102277523 B CN102277523 B CN 102277523B
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Abstract
The invention discloses an Fe-X-C crystal grain refiner and a preparation method thereof, belonging to the technical field of metallic materials. The Fe-X-C crystal grain refiner comprises the following components in percentage by weight: 35-99.4% of Fe, 0.1-15% of C and 0.5-50% of X, wherein X is one or a plurality of Ti, V and Nb. The preparation method of the Fe-X-C crystal grain refiner comprises the following steps: 1. mixing Fe-C alloy with metal X, or mixing pure iron and graphite with the metal X, and then melting a mixture in an intermediate frequency induction furnace in vacuum, wherein in the mixture, Fe accounts for 35-99.4%, C accounts for 0.1-15%, and Fe is balance; 2. when the temperature of a melt is 1550-1650DEG C, introducing argon into the melt for 10s-3h; and 3. stopping introducing the argon, and carrying out outage to obtain the Fe-X-C crystal grain refiner. The Fe-X-C crystal grain refiner is simple to prepare. When the crystal grain refiner is added into a steel melt, steel crystal grains can be refined, and thus the equiaxed crystal zone ratio of billet casting state structure is improved to be above 60%.
Description
The present invention by number of patent application is: 200910307631.7; Name of patent application is: " Fe-X-C grain-refining agent and preparation method thereof "; Patented claim is artificial: Shanghai Communications University, Baoshan Iron & Steel Co., Ltd, patented claim day is: the patent on September 24th, 2009 is divided an application.
Technical field
The present invention relates to grain-refining agent of a kind of metallic substance technical field and preparation method thereof, specifically is a kind of Fe-X-C grain-refining agent and preparation method thereof.
Background technology
Weave construction decision its performance, the especially intensity and the toughness of steel.Crystal grain is thin more, and the intensity of steel and toughness are just high more.In the casting process, if only from externally cooled, the speed of cooling of generous inside steel billet is slow, and the forming core core is few, with mainly growing with the mode of column crystal, causes defectives such as crystal grain is thick, center segregation, when subsequent hot rolled, is easy to generate limit portion crackle.The key that addresses this problem is molten steel to be carried out forming core handle, and enlarges strand equiax crystal district ratio, crystal grain thinning.Controlling metal solidification texture through the interpolation nucleating agent is the crystal fining method of using always, and purpose is the formation that reduces dendrite interval, promotion equiax crystal, the growth that suppresses column crystal.The forming core core mainly contains two kinds of sources: external forming core particle and Nei Sheng forming core particle.Wherein, mainly be to point in the melt to add grain-refining agent through increasing the method that external forming core particle reaches the refinement purpose.
Literature search through to prior art is found; Kingdom holds; Fang Keming, Wang Tieming etc. have described following content in " add the research of the super particulate of titanium nitride in the high temperature pure iron melt ", steel vanadium titanium; 2006,27 (2): 21～25 ": adopt in the pure iron melt, to add TiN particulate method refined cast structure.But,, be difficult to it added in the melt, and gather partially easily with the method for winding-up, hello silk because the TiN particle is more tiny.The technical problem that the present invention will solve is: a kind of grain-refining agent of new steel is provided, and this grain-refining agent preparation is simple, easy to use.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of Fe-X-C grain-refining agent and preparation method thereof is provided.Grain-refining agent preparation of the present invention is simple; In steel melt, add the Fe-X-C grain-refining agent, but the crystal grain of refinement steel is brought up to more than 60% steel billet as-cast structure equiax crystal district ratio.
The present invention relates to a kind of Fe-X-C grain-refining agent, its component and mass percent are: Fe 35～99.4%, and C 0.1～15%, and X 0.5～50%; Wherein, X is Ti, one or more among V and the Nb.
Density>=10000 of XC in the said Fe-X-C grain-refining agent/mm
3
Said Fe-X-C grain-refining agent, its component and mass percent are: Fe 99.4%, and C 0.1%, and Ti 0.5%.
Said Fe-X-C grain-refining agent, its component and mass percent are: Fe 35%, and C 15%, and Ti 0.5%, and Nb 25%.
Said Fe-X-C grain-refining agent, its component and mass percent are: Fe 67.5%, and C 7.5%, and Ti 10%, and Nb 10%, and V 5%.
The invention still further relates to a kind of preparation method of above-mentioned Fe-X-C grain-refining agent, comprise the steps:
Step 1 is got the Fe-C alloy, mixes with metal X;
Perhaps, get pure iron and graphite, mix with metal X afterwards;
Afterwards with mixture frequently feel in a vacuum melt in the stove melt;
In the step 2, said feeding argon gas, flow are 100～1000ml/min.
The present invention will contain Fe, and the mixture of C and X is put into the fusing of intermediate frequency vacuum induction furnace crucible internal heating, and ventpipe is inserted in the alloy melt, after ventilation reaches the scheduled time, extract ventpipe out, and the outage casting promptly obtains the grain-refining agent of steel.For preventing alloy oxidization burning loss in fusion process; The melting of alloy is carried out under vacuum; Adopt the method for in melt, inserting the gas blow pipe blowing argon gas to realize stirring simultaneously, improve the disperse in grain-refining agent of TiC, VC, the NbC second phase particle and distribute melt.
Compared with prior art, the present invention has following beneficial effect: grain-refining agent preparation of the present invention is simple, with low cost; The second phase pellet density reaches 10000/mm at least in the Fe-X-C grain-refining agent that the present invention prepares; In steel melt, add the Fe-X-C grain-refining agent, but the crystal grain of refinement steel is brought up to more than 60% steel billet as-cast structure equiax crystal district ratio.
Description of drawings
Fig. 1 is a Fe-X-C grain-refining agent preparation facilities synoptic diagram;
Fig. 2 is not for adding the 409L ferritic stainless steel macrograph figure of fining agent;
Fig. 3 is 409L ferritic stainless steel macrograph figure behind the interpolation 2wt% fining agent.
Embodiment
Following instance will combine accompanying drawing that the present invention is described further.Present embodiment provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.The experimental technique of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.
Fig. 1 is a Fe-X-C grain-refining agent preparation facilities synoptic diagram, and this device comprises: ball valve 1, argon flow amount meter 2, argon bottle 3; Ruhmkorff coil 4, temperature measurer 5, crucible 6, thermopair 7; Ventpipe 9, its Center Vent tube 9 is communicated with argon bottle 3, and ball valve 1 is positioned on the ventpipe 9 with argon flow amount meter 2; Temperature measurer 5 links to each other with thermopair 7, and ventpipe 9 extend in the crucible 6 with thermopair 7, and ruhmkorff coil 4 is positioned at around the crucible 6.To contain Fe, the mixture of C and X is put into the fusing of intermediate frequency vacuum induction furnace crucible 6 internal heating, and said X is one or more among Ti, V or the Nb.Adopt thermocouple temperature measuring apparatus 5,7 on-line measurement temperature, make melt temperature remain on 1550～1650 ℃; Open ball valve 1, regulate the air-flow that argon flow amount meter 2 makes argon bottle 3 outputs; Ventpipe 9 is inserted in the alloy melt 10; After ventilation reaches 10s～3h, extract ventpipe 9 out, the outage casting promptly obtains the grain-refining agent of steel.
Table 1
Embodiment 1
As shown in table 1, present embodiment prepares process and comprises the steps:
Step 1 is mixed the Fe-C alloy with metal Ti, with mixture frequently melt in the induction furnace in a vacuum melt; Said mixing need make the mass percent of each element in the mixture that obtains be: Fe 99.4%, and Ti 0.5%, and C 0.1%;
Present embodiment prepares that the TiC particle size mainly concentrates on 0.5～5 μ m in the gained grain-refining agent, and TiC density is 10
4Individual/mm
3
With the 409L ferritic stainless steel in a vacuum frequently behind the induction furnace internal heating to 1530 ℃, the molten steel casting.The macrostructure of 409L steel that does not add fining agent is as shown in Figure 2, equiax crystal district grain-size: 2000 microns, and equiax crystal district ratio 34.1%.The 409L ferritic stainless steel in a vacuum after induction furnace internal heating to the 1530 ℃ fusing frequently, is added the fining agent of the present embodiment of 2wt% in molten steel, cast after being incubated for 10 seconds.To the foundry goods xsect polish, burn into observes and to learn that equiax crystal district proportion is not increased to 83% by adding 34.1% before the fining agent, and equiax crystal district grain-size is reduced to 500 microns by 2000 microns that do not add before the fining agent, and is as shown in Figure 3.
As shown in table 1, present embodiment prepares process and comprises the steps:
Step 1 is mixed the Fe-C alloy with metal Ti, metal V and metal Nb, with mixture frequently melt in the induction furnace in a vacuum melt; Said mixing need make the mass percent of each element in the mixture that obtains be: Fe 35%, and Ti 25%, and Nb 25%, and C 15%;
Present embodiment prepares that the XC pellet density is 10 in the gained grain-refining agent
7Individual/mm
3But present embodiment prepares the crystal grain of gained grain-refining agent refinement steel, and steel billet as-cast structure equiax crystal district ratio is improved.
As shown in table 1, present embodiment prepares process and comprises the steps:
Step 1, with pure iron, graphite mixes with metal Ti, metal V and metal Nb, with mixture frequently melt in the induction furnace in a vacuum melt; Said mixing need make the mass percent of each element in the mixture that obtains be: Fe 67.5%, and Ti 10%, and V 5%, and Nb 10%, and C 7.5%;
Present embodiment prepares that XC density is 10 in the gained grain-refining agent
8Individual/mm
3But present embodiment prepares the crystal grain of gained grain-refining agent refinement steel, and steel billet as-cast structure equiax crystal district ratio is improved.
Claims (4)
1. a Fe-X-C grain-refining agent is characterized in that, component and mass percent are: Fe 35%, and C 15%, and Ti 25%, and Nb 25%, and wherein X is Ti element and Nb element.
2. Fe-X-C grain-refining agent according to claim 1 is characterized in that, the density of XC>=10000/mm
3
3. the preparation method of a Fe-X-C grain-refining agent as claimed in claim 1 is characterized in that, comprises the steps:
Step 1 is got the Fe-C alloy, mixes with metal X;
Perhaps, get pure iron and graphite, mix with metal X afterwards;
Afterwards with mixture frequently melt in the induction furnace in a vacuum melt;
Step 2 when the temperature of melt is 1550～1650 ℃, feeds argon gas in melt, the time is 10s～3h;
Step 3 stops to feed argon gas, and outage gets the Fe-X-C grain-refining agent.
4. the preparation method of Fe-X-C grain-refining agent according to claim 3 is characterized in that, in the step 2, said feeding argon gas, flow are 100～1000ml/min.
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| CN201110161142A CN102277523B (en) | 2009-09-24 | 2009-09-24 | Fe-X-C crystal grain refiner and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110161142A CN102277523B (en) | 2009-09-24 | 2009-09-24 | Fe-X-C crystal grain refiner and preparation method thereof |
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| CN2009103076317A Division CN101649411B (en) | 2009-09-24 | 2009-09-24 | Fe-X-C grain refiner and preparation method thereof |
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| CN102974790B (en) * | 2012-11-27 | 2014-09-17 | 西南铝业（集团）有限责任公司 | Method, device and system for adding grain refiner to aluminum alloy |
| CN107008872B (en) * | 2017-03-10 | 2019-07-02 | 东北大学 | Grain refiner for ferritic stainless steel continuous casting and preparation method thereof and application method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101490285A (en) * | 2006-05-31 | 2009-07-22 | 辛维特有限公司 | Grain refiners for steel - manufacturing methods and use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101490285A (en) * | 2006-05-31 | 2009-07-22 | 辛维特有限公司 | Grain refiners for steel - manufacturing methods and use |
Non-Patent Citations (3)
| Title |
|---|
| Cheng-Guo Wang et al..Dispersion strengthened alloy due to the precipitation during mechanical alloying.《Materials Science and Engineering：A》.2001,第308卷(第1-2期),第292-294页. * |
| JP特开2001-323335A 2001.11.22 |
| 许晓锋 等.Fe-C-X系合金针状铁素体在奥氏体贫碳区先共析转变的热力学分析.《中国石油大学学报(自然科学版)》.2006,第30卷(第3期),第93-96页. * |
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