CN108048639B - A method of improving graphitizable steel plate stamping and forming performance - Google Patents
A method of improving graphitizable steel plate stamping and forming performance Download PDFInfo
- Publication number
- CN108048639B CN108048639B CN201711315901.XA CN201711315901A CN108048639B CN 108048639 B CN108048639 B CN 108048639B CN 201711315901 A CN201711315901 A CN 201711315901A CN 108048639 B CN108048639 B CN 108048639B
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- CN
- China
- Prior art keywords
- steel plate
- graphitization
- ferrite
- stamping
- rolling
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Classifications
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- 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 Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A method of graphitizable steel plate stamping and forming performance is improved, steel material processing technique field is belonged to.It is characterized in that carrying out the warm deformation of Dynamic Recrystallization of Ferrite to the graphitization steel plate after graphitization processing using warm deformation technology, 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, is air-cooled to room temperature after rolling.The graphitization steel plate handled using this method, ferrite crystal grain are fined and uniformly, and 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 technique
The preparation flow of graphitization steel plate mainly includes the techniques mistakes such as steel-making, casting, hot rolling or cold rolling, graphitization processing
Journey.Wherein, steel plate shows higher stamping formabilily after graphitization processing, has lower 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, and such tissue characteristic is difficult
Make steel plate that there is good stamping formabilily.
Therefore, 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
Roll, with realize ferrite crystal grain refinement, homogenization, for it is subsequent it is stamping good Preparedness Directorate is provided, further to mention
Its high stamping formabilily.
Summary of the invention
Graphitization steel plate after graphitization processing, stamping formabilily with higher.Due to graphitization processing process
In easily cause ferrite crystal grain coarse, and it is uneven.Therefore, in order to solve this problem, the present invention is based on warm deformations can make iron
Ferritic recrystallization, to make fetrite grain refinement and homogenization, propose one kind can further improve graphitization steel plate strike out
The method of shape performance.
The present invention is realized by following technical measures:
A method of improving graphitizable steel plate stamping and forming performance, it is characterised in that warm deformation technology is utilized, to graphite
Change treated graphitization steel plate carry out Dynamic Recrystallization of Ferrite warm deformation, with realize ferrite crystal grain refinement 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, refers to and in temperature is to graphitization steel plate
8~16 hours isothermals are carried out within the scope of 600 DEG C~Ac1, and cool to a heat treatment process of room temperature with the furnace.This method is main
Being to C content is 0.30~1.20%, Si content is 0.60~1.60%, Mn content is 0.20~0.50%, P content≤
0.015%, S content≤0.015%, the graphitization steel plate that remaining content is Fe carry out.
Beneficial effects of the present invention:
The graphitization steel plate handled using this method, it can be subsequent punching that ferrite crystal grain, which is fined and homogenizes,
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 solution of the present invention 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 content is 0.98%, Mn content is 0.36%, P content is
0.008%, the graphitization steel plate for the 2.3mm thickness that S content is 0.015%, remaining content is Fe, through 680 DEG C, 10 hours 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
Unevenly.The steel plate is packed into heating furnace at room temperature, is come out of the stove after being graphitized steel plate and being heated to 630 DEG C of sammings, is started
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 is mostly the yield tensile ratio σ in 15~18 μ mss/σbFor
0.52, strain hardening exponentIt is 0.28, in-plane anisotropy △ r is 0.13.
Embodiment 2
The present embodiment selection C content is 1.16%, Si content is 1.38%, Mn content is 0.42%, P content is
0.009%, the graphitization steel plate for the 3.3mm thickness that S content is 0.008%, remaining content is Fe, through 700 DEG C, 12 hours isothermals,
After being furnace-cooled to the graphitization processing of room temperature, tissue is mainly made of ferrite and graphite, and same ferrite crystal grain is coarse, and not
Uniformly.The steel plate is packed into heating furnace at room temperature, is come out of the stove after being graphitized steel plate and being heated to 660 DEG C of sammings, is started flat
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 is mostly the yield tensile ratio σ in 19~21 μ mss/σbFor
0.55, strain hardening exponentIt is 0.26, in-plane anisotropy △ r is 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 steel plate tool
There is a good stamping formabilily, i.e. warm-rolling deformation stamping can provide good Preparedness Directorate to be rear.
Claims (1)
1. a kind of method for improving graphitizable steel plate stamping and forming performance, it is characterised in that warm deformation technology is utilized, to graphitization
Treated graphitization steel plate carry out Dynamic Recrystallization of Ferrite warm deformation, with realize ferrite crystal grain refinement and uniformly
Change；
The graphitization processing refers to that graphitization steel plate be to carry out 8~16 hours etc. within the scope of 600 DEG C~Ac1 in temperature
Temperature, and cool to a heat treatment process of room temperature with the furnace；
The main chemical compositions and its mass percentage content of the graphitization steel plate are as follows: C:0.86~1.20%；Si:0.60~
1.60%；Mn:0.20~0.42%；P≤0.015%；S :≤0.015%；Remaining content is Fe；
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；
Yield tensile ratio≤0.56 of steel plate, strain hardening exponent >=0.25, in-plane anisotropy≤0.15 are graphitized after warm deformation.
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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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| CN108048639B true CN108048639B (en) | 2019-07-12 |
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| CN111189701B (en) * | 2020-01-08 | 2021-09-17 | 吉林大学 | Method for measuring large-strain compression hardening curve of metal hyperbolic sample |
| CN111471844B (en) * | 2020-04-02 | 2021-03-05 | 北京科技大学 | Treatment method for realizing superplasticity of graphitized steel |
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| CN101899555B (en) * | 2010-08-04 | 2011-12-14 | 武汉钢铁(集团)公司 | Production method of graphitized free-machining steel |
| KR101657790B1 (en) * | 2014-12-09 | 2016-09-20 | 주식회사 포스코 | Steel material for graphitization and graphite steel with excellent machinability and cold forging characteristic |
| CN106048179B (en) * | 2016-07-15 | 2017-09-15 | 北京科技大学 | A kind of preparation method of graphitization hot rolled steel plate |
| CN106917044B (en) * | 2017-03-03 | 2019-02-26 | 北京科技大学 | A kind of stamping preparation method with graphitization cold rolling high carbon steel sheet |
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