CN108048639A - A kind of method for improving graphitizable steel plate stamping and forming performance - Google Patents
A kind of method for improving graphitizable steel plate stamping and forming performance Download PDFInfo
- Publication number
- CN108048639A CN108048639A CN201711315901.XA CN201711315901A CN108048639A CN 108048639 A CN108048639 A CN 108048639A CN 201711315901 A CN201711315901 A CN 201711315901A CN 108048639 A CN108048639 A CN 108048639A
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- CN
- China
- Prior art keywords
- steel plate
- graphitization
- improving
- stamping
- ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0431—Warm rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/006—Graphite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of method for improving graphitizable steel plate stamping and forming performance, belongs to steel material processing technique field.It is characterized in that using warm deformation technology, the warm deformation of Dynamic Recrystallization of Ferrite is carried out to the graphitization steel plate after graphitization processing, the stamping formabilily of graphitization steel plate is improved by controlling refinement and the homogenization of ferrite dynamic crystal grain.Specific method is that the graphitization steel plate Jing Guo graphitization processing is heated to 550~710 DEG C, and the flat rolling that drafts is 8~15% is carried out after samming, room temperature is air-cooled to after rolling.The graphitization steel plate handled using this method, ferrite crystal grain is fined and uniformly, stamping formabilily is good, yield tensile ratio≤0.56, strain hardening exponent >=0.25, in-plane anisotropy≤0.15.
Description
Technical field
The present invention relates to a kind of methods for improving graphitizable steel plate stamping and forming performance, belong to steel material processing technology neck
Domain.
Background technology
The preparation flow of graphitization steel plate mainly includes steel-making, pours into a mould, the techniques mistake such as hot rolling or cold rolling, graphitization processing
Journey.Wherein, steel plate shows higher stamping formabilily after graphitization processing, has relatively low yield tensile ratio, can soften
To the level as mild steel.
Steel plate through graphitization processing, tissue are mainly made of ferrite+graphite.However, due to graphitization processing mistake
The time that journey needs is longer, and the ferritic structure often led in steel plate is coarse, and uneven, such tissue characteristic, it is difficult to
Make steel plate that there is good stamping formabilily.
Therefore, it is coarse to solve ferrite crystal grain present in existing graphitization processing method, and non-uniform problem, this
Invention is proposed using warm deformation technology, and the temperature of Dynamic Recrystallization of Ferrite is carried out to the graphitization steel plate after graphitization processing
It rolls, to realize the refinement of ferrite crystal grain, homogenization, good Preparedness Directorate is provided to be subsequently stamping, further to carry
Its high stamping formabilily.
The content of the invention
Graphitization steel plate after graphitization processing has higher stamping formabilily.Due to graphitization processing process
In to easily cause ferrite crystal grain coarse and uneven.Therefore, in order to solve the problems, such as this, the present invention is based on warm deformations can make iron
Ferritic recrystallizes, to make fetrite grain refinement and homogenization, it is proposed that one kind can further improve graphitization steel plate and strike out
The method of shape performance.
The present invention is realized by following technical measures：
A kind of method for improving graphitizable steel plate stamping and forming performance, it is characterised in that using warm deformation technology, to graphite
Change treated graphitization steel plate carry out Dynamic Recrystallization of Ferrite warm deformation, with realize the refinement of ferrite crystal grain and uniformly
Change.Specific method is that the graphitization steel plate Jing Guo graphitization processing is heated to 550~710 DEG C, and drafts is carried out after samming
For 8~15% flat rolling, room temperature is air-cooled to after rolling.The graphitization processing, refer to graphitization steel plate be in temperature
Isothermal when progress 8~16 is small in the range of 600 DEG C~Ac1, and cool to a heat treatment process of room temperature with the furnace.This method is main
It is 0.30~1.20% to C content to be, Si contents are 0.60~1.60%, Mn contents are 0.20~0.50%, P content≤
0.015%th, S content≤0.015%, remaining content carry out for the graphitization steel plate of Fe.
Beneficial effects of the present invention：
The graphitization steel plate handled using this method, ferrite crystal grain are fined and homogenized, and can be follow-up punching
Pressing formation provides good Preparedness Directorate, hence it is evident that improves the stamping formabilily of graphitization steel plate, yield tensile ratio≤0.56, strain
Hardenability value >=0.25, in-plane anisotropy≤0.15.
Specific embodiment
After now the embodiment of the present invention is specifically described in.
Technical scheme is described further with reference to embodiments.Embodiment is merely to illustrate the present invention,
Rather than limit the present invention in any way.
Embodiment 1
The present embodiment selection C content is 0.86%, Si contents are 0.98%, Mn contents are 0.36%, P content is
0.008%th, the graphitization steel plate for the 2.3mm thickness that S contents are 0.015%, remaining content is Fe, through 680 DEG C, 10 it is small when etc.
Temperature, after being furnace-cooled to the graphitization processing of room temperature, tissue is mainly made of ferrite and graphite, but ferrite crystal grain is coarse, and
It is uneven.The steel plate is packed into heating furnace at room temperature, comes out of the stove, starts after graphitization steel plate is heated to 630 DEG C of sammings
Warm-rolling, drafts 0.3mm, i.e., 13% are carried out on flat roll mill to it；Finishing temperature is not less than 550 DEG C；It is air-cooled to after rolling
Room temperature.
Metallographic Analysis and mechanical test are carried out to the graphitization steel plate Jing Guo above-mentioned processing, the results show that its institutional framework
In observe ferrite crystal grain it is uniform, radial dimension mostly be in 15~18 μ ms, yield tensile ratio σs/σbFor
0.52, strain hardening exponentFor 0.28, in-plane anisotropy △ r are 0.13.
Embodiment 2
The present embodiment selection C content is 1.16%, Si contents are 1.38%, Mn contents are 0.42%, P content is
0.009%th, the graphitization steel plate for the 3.3mm thickness that S contents are 0.008%, remaining content is Fe, through 700 DEG C, 12 it is small when isothermal,
After being furnace-cooled to the graphitization processing of room temperature, tissue is mainly made of ferrite and graphite, and similary ferrite crystal grain is coarse, and not
Uniformly.The steel plate is packed into heating furnace at room temperature, comes out of the stove, starts flat after graphitization steel plate is heated to 660 DEG C of sammings
Warm-rolling, drafts 0.3mm, i.e., 9.1% are carried out on roller mill to it；Finishing temperature is not less than 550 DEG C；Room is air-cooled to after rolling
Temperature.
Metallographic Analysis and mechanical test are carried out to the graphitization steel plate Jing Guo above-mentioned processing, the results show that its institutional framework
In observe ferrite crystal grain it is uniform, radial dimension mostly be in 19~21 μ ms, yield tensile ratio σs/σbFor
0.55, strain hardening exponentFor 0.26, in-plane anisotropy △ r are 0.15.
By embodiment as it can be seen that before graphitizable steel plate stamping and forming, warm-rolling deformation is carried out to it, it can be ensured that the steel plate has
There is a good stamping formabilily, i.e. warm-rolling deformation can be rear stamping to provide good Preparedness Directorate.
Claims (3)
- A kind of 1. method for improving graphitizable steel plate stamping and forming performance, it is characterised in that using warm deformation technology, to graphitization Treated graphitization steel plate carry out Dynamic Recrystallization of Ferrite warm deformation, with realize the refinement of ferrite crystal grain and uniformly Change；Specific method is that the graphitization steel plate Jing Guo graphitization processing is heated to 550~710 DEG C, and drafts is carried out after samming For 8~15% flat rolling, room temperature is air-cooled to after rolling.
- 2. according to a kind of method for improving graphitizable steel plate stamping and forming performance described in claim 1, which is characterized in that described Graphitization processing refers to that graphitization steel plate be isothermal when progress 8~16 is small in the range of 600 DEG C~Ac1 in temperature, and with furnace cooling But to a heat treatment process of room temperature.
- 3. according to a kind of method for improving graphitizable steel plate stamping and forming performance described in claim 1, which is characterized in that the stone The main chemical compositions and its mass percentage content of inkization steel plate are：C：0.30~1.20%；Si：0.60~1.60%；Mn： 0.20~0.50%；P≤0.015%；S：≤ 0.015%；Remaining content is Fe.
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| CN201711315901.XA CN108048639B (en) | 2017-12-12 | 2017-12-12 | A method of improving graphitizable steel plate stamping and forming performance |
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| CN201711315901.XA CN108048639B (en) | 2017-12-12 | 2017-12-12 | A method of improving graphitizable steel plate stamping and forming performance |
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| CN108048639A true CN108048639A (en) | 2018-05-18 |
| CN108048639B CN108048639B (en) | 2019-07-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189701A (en) * | 2020-01-08 | 2020-05-22 | 吉林大学 | Method for measuring large-strain compression hardening curve of metal hyperbolic sample |
| CN111471844A (en) * | 2020-04-02 | 2020-07-31 | 北京科技大学 | Treatment method for realizing superplasticity of graphitized steel |
Citations (4)
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| CN101899555A (en) * | 2010-08-04 | 2010-12-01 | 武汉钢铁(集团)公司 | Production method of graphitized free-machining steel |
| CN105671441A (en) * | 2014-12-09 | 2016-06-15 | Posco公司 | Steel material for graphitization and graphite steel with excellent machinability and cold forging characteristic |
| CN106048179A (en) * | 2016-07-15 | 2016-10-26 | 北京科技大学 | Preparation method of graphitizing hot rolled steel plate |
| CN106917044A (en) * | 2017-03-03 | 2017-07-04 | 北京科技大学 | A kind of preparation method of the stamping cold rolling high carbon steel sheet of use graphitization |
-
2017
- 2017-12-12 CN CN201711315901.XA patent/CN108048639B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899555A (en) * | 2010-08-04 | 2010-12-01 | 武汉钢铁(集团)公司 | Production method of graphitized free-machining steel |
| CN105671441A (en) * | 2014-12-09 | 2016-06-15 | Posco公司 | Steel material for graphitization and graphite steel with excellent machinability and cold forging characteristic |
| CN106048179A (en) * | 2016-07-15 | 2016-10-26 | 北京科技大学 | Preparation method of graphitizing hot rolled steel plate |
| CN106917044A (en) * | 2017-03-03 | 2017-07-04 | 北京科技大学 | A kind of preparation method of the stamping cold rolling high carbon steel sheet of use graphitization |
Non-Patent Citations (1)
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| 彭大暑: "《金属塑性加工原理》", 30 April 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189701A (en) * | 2020-01-08 | 2020-05-22 | 吉林大学 | Method for measuring large-strain compression hardening curve of metal hyperbolic sample |
| CN111471844A (en) * | 2020-04-02 | 2020-07-31 | 北京科技大学 | Treatment method for realizing superplasticity of graphitized steel |
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| Publication number | Publication date |
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| CN108048639B (en) | 2019-07-12 |
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