CN104379277A - Twinning induced plasticity steel and production method thereof - Google Patents
Twinning induced plasticity steel and production method thereof Download PDFInfo
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- CN104379277A CN104379277A CN201380030717.4A CN201380030717A CN104379277A CN 104379277 A CN104379277 A CN 104379277A CN 201380030717 A CN201380030717 A CN 201380030717A CN 104379277 A CN104379277 A CN 104379277A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 229910000937 TWIP steel Inorganic materials 0.000 title abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 238000005266 casting Methods 0.000 claims abstract description 36
- 238000009628 steelmaking Methods 0.000 claims abstract description 26
- 238000009749 continuous casting Methods 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims abstract description 18
- 238000001953 recrystallisation Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 33
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- 239000013078 crystal Substances 0.000 claims description 23
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- 239000010955 niobium Substances 0.000 claims description 20
- 238000005204 segregation Methods 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 19
- 239000010936 titanium Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052758 niobium Inorganic materials 0.000 claims description 18
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 18
- 239000002244 precipitate Substances 0.000 claims description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 17
- 239000011574 phosphorus Substances 0.000 claims description 17
- 229910052719 titanium Inorganic materials 0.000 claims description 17
- 229910052723 transition metal Inorganic materials 0.000 claims description 17
- 150000003624 transition metals Chemical class 0.000 claims description 17
- 229910052720 vanadium Inorganic materials 0.000 claims description 17
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 17
- 230000001939 inductive effect Effects 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 14
- 239000005864 Sulphur Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000013019 agitation Methods 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 4
- TYVZWSKMZUHIKH-UHFFFAOYSA-N [O].[P].[S] Chemical compound [O].[P].[S] TYVZWSKMZUHIKH-UHFFFAOYSA-N 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 24
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009851 ferrous metallurgy Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- NTGONJLAOZZDJO-UHFFFAOYSA-M disodium;hydroxide Chemical compound [OH-].[Na+].[Na+] NTGONJLAOZZDJO-UHFFFAOYSA-M 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000001995 intermetallic alloy Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/02—Superplasticity
-
- 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
- C21D2211/004—Dispersions; Precipitations
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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)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses twinning induced plasticity steel and a production method thereof. The production process comprises a steelmaking step, a continuous casting step and a rolling step; performing the continuous casting step is performed under a cast protective condition; the cast protective condition is that the casting powder is used for low superheat casting at a temperature of 5-10 DEG C, with the casting speed of 0.5 to 1.5 m/min; and in the rolling step, cold rolling pre deformation is adopted, and annealing treatment is performed when the temperature is near complete recrystallization. With the above scheme, the invention can provide the TWIP steel with a yield strength exceeding 1000MPa and a uniform elongation rate of more than 10%, is particularly suitable for special steel applications in automotive and the like, and has a very high market value.
Description
Technical field
The present invention relates to Ferrous Metallurgy and metal material, in particular, a kind of twin crystal inducing plasticity steel and production method thereof.
Background technology
Steel-making is the process by oxidation reaction decarburization, intensification, alloying, its main task is decarburization, deoxidation, intensification, removal gas and nonmetal inclusion, alloying, mainly comprise molten iron pretreatment, bessemerize, alloying, refining, continuous casting steel machine, the step such as steel rolling.
For steel, its distortion is divided into elastic deformation (external force is cancelled and can be recovered original form) and plastic deformation, and (external force is cancelled and can not be recovered original form, shape changes), after stress exceedes elastic limit, distortion increases very fast, now except producing elastic deformation, also generating portion plastic deformation.After stress reaches B point, plastic strain sharply increases, and a chain-wales fluctuated appears in curve, and this phenomenon is called surrender.Maximum, the minimum stress of this one-phase are called upper yield point and lower yield point.Because the numerical value of lower yield point is comparatively stable, the index therefore using it as material drag, is called yield point or yield strength.
When after steel surrender to a certain extent, because internal grain rearranges, its resistance capacity to deformation improves again, although now distortion development is very fast, can only improve, until stress reaches maximum along with the raising of stress.After this, the ability of steel resistance to deformation obviously reduces, and at most weakness, larger plastic deformation occurs, and test specimen cross section reduces rapidly herein, occurs necking phenomenon, until rupture failure.Maximum stress value before steel are broken is called strength degree or tensile strength.Hot strength refers to that material produces the stress value of maximum uniform plastic deformation under tensile stress.
High manganese deformation twin inducing plasticity steel (the Twinning Induced Plasticity developed in recent years, TWIP steel), in deformation process, produce deformation twin there is TWIP effect, thus possess good mechanical performance, as having high tensile and high-ductility simultaneously.At present, in the world first generation Fe-25Mn-Al-3Si-0.03C series is comprised to the research and development of TWIP steel, and second generation Fe-23Mn-0.6C series.
Automotive field loss of weight and minimizing gas discharging parts, need have good formability while needing high-yield strength, TWIP steel has wide practical use in automobile loss of weight,
But although TWIP steel has high strength and high-ductility, compared with other AHSS iron, the yield strength of TWIP steel is lower, is about 200 ~ 400MPa, this factor limits its commercial applications in auto manufacturing.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of novel twin crystal inducing plasticity steel and production method thereof.
Technical scheme of the present invention is as follows: a kind of production method of twin crystal inducing plasticity steel, and it comprises the following steps: steel-making step, continuous casting step and steel rolling step; Under the condition of protective casting, perform described continuous casting step; Wherein, the condition of described protective casting is: adopt covering slag, carry out low overheat casting with 5 DEG C-10 DEG C, pulling rate is 0.5 to 1.5 m/min; In described steel rolling step, adopt cold rolling predeformation, and be carry out annealing in process close to perfect recrystallization temperature.
Preferably, in described production method, in described steel rolling step, deflection is adopted to be that 10%-60% carries out predeformation cold rolling.
Preferably, in described production method, in described steel rolling step, comprise reply and partial, re-crystallization annealing process, its treatment temperature is between 550 to 700 degrees Celsius, and the processing time is 100 to 1000 seconds.
Preferably, in described production method, described steel-making step comprises falls sulphur phosphorus oxygen process, and at the end of described steel-making step, sulphur is lower than 0.0025%, and phosphorus is lower than 0.0025%, and total oxygen content is lower than 0.0015%.
Preferably, in described production method, described steel-making step comprises alloying process, and it adds the following at least one transition metal that gross mass percentage is 0.01-2%: titanium, niobium, vanadium.
Preferably, in described production method, described steel rolling step comprises metal precipitation process, and at the end of described steel rolling step, the volume fraction of transition metal precipitate phase is 1%-2%, and size is 15nm to 150nm; Further, the volume fraction of metal precipitate phase Al (C, N) is 0.2%-0.5%, and size is 15nm to 150nm.
Preferably; in described production method; described protective casting adopts covering slag to realize, and the mass percent of the composition of covering slag is: calcium oxide 30%-40%, silica 30%-40%, alundum (Al2O3) 5%-10%, magnesia 5%-10%, and surplus is sodium oxide molybdena and fluorine.
Preferably, in described production method, in described continuous casting step, adopt M-EMS to control to reduce column crystal ratio and increase equiaxed zone ratio, strand equiaxed zone ratio is more than 70%, and solidification end adopts electromagnetic agitation, be provided for continuous casting billet structure evenly and reduce carbon, phosphorus and sulphur segregation, carbon center's degree of segregation controls between 1.0-1.1, and phosphorus, sulphur center segregation degree control respectively between 1.0-1.15, and manganese center segregation degree controls between 1.0-1.2.
Another technical scheme of the present invention is, a kind of twin crystal inducing plasticity steel, it adopts arbitrary aforementioned production method to prepare, it comprises carbon 0.2-1.0%, manganese 10-25%, aluminium 0.02-1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and gross mass percentage is the following at least one transition metal of 0.01-2%: titanium, niobium, vanadium, surplus is ferro element.
Preferably, described twin crystal inducing plasticity steel comprises following at least one element and consumption thereof: titanium 0.01-1.2%, niobium 0.01-1.2%, vanadium 0.01-1.2%.
Adopt such scheme, the present invention can provide a kind of yield strength more than 1000MPa, the TWIP steel of uniform elongation more than 10%, is particularly useful for the special rolling-mill section application such as automobile, has very high market using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of production method of the present invention.
Detailed description of the invention
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to the embodiment described by this description.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.The term " vertical " that this description uses, " level ", "left", "right" and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology of using of this description and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention in this description just in order to describe specific embodiment is not for limiting the present invention.The term "and/or" that this description uses comprises arbitrary and all combinations of one or more relevant Listed Items.
The invention belongs to Ferrous Metallurgy and metal material field, there is provided a kind of yield strength more than 1000MPa, the TWIP steel production method of uniform elongation more than 10%, especially the production technology of traditional TWIP steel is improved, its yield strength can be brought up to more than 1000MPa, simultaneously the production method of uniform elongation more than 10%.One embodiment of the present of invention are, a kind of production method of twin crystal inducing plasticity steel, and it comprises the following steps: steel-making step, continuous casting step and steel rolling step; Under the condition of protective casting, perform described continuous casting step; Wherein, the condition of described protective casting is: adopt covering slag, carry out low overheat casting with 5 DEG C-10 DEG C, pulling rate is 0.5 to 1.5 m/min; Further, in described steel rolling step, cold rolling predeformation is adopted.Preferably, step of making steel selects traditional TWIP steel, traditional TWIP steel scrap or other materials.
As shown in Figure 1, one embodiment of the present of invention are, a kind of production method of twin crystal inducing plasticity steel, and it comprises the following steps: steel-making step, continuous casting step and steel rolling step; Continuous casting step and continuous casting steel machine step; Under the condition of protective casting, perform described continuous casting step; Wherein, the condition of described protective casting is: adopt covering slag, carry out low overheat casting with 5 DEG C-10 DEG C, pulling rate is 0.5 to 1.5 m/min; In described steel rolling step, adopt cold rolling predeformation, and be carry out annealing in process close to perfect recrystallization temperature.Preferably, in the material of steel-making, comprise carbon <1.0%, manganese <25%, aluminium <1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and the following at least one transition metal of gross mass percentage <2%: titanium, niobium, vanadium, surplus is the material of ferro element and other participation steel-making.Such as, the material of steel-making is set according to following steel-making target, steel-making target comprises carbon 0.2-1.0%, manganese 10-25%, aluminium 0.02-1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and gross mass percentage is the following at least one transition metal of 0.01-2%: titanium, niobium, vanadium, surplus is ferro element.
Preferably, steelmaking process reduces total oxygen content, and then reduces the quantity of steel grade field trash, and make S, P mass percent of steel grade control below 0.0025%, total oxygen content is below 0.0015% simultaneously.Casting process adopts low overheat, low pulling rate to cast as far as possible, the degree of superheat controls between 5 DEG C-10 DEG C, casting speed control is at 0.5/min-1.2m/min, casting cycle adopts M-EMS means simultaneously, make continuous casting billet structure even, strand central defect controls in 0-2 level, and equiaxed zone ratio is more than 70%.The modes such as solidification end electromagnetic agitation are cast and are made material structure more even, and C element center segregation degree controls between 1.0-1.1, and P, S two kinds of element center degree of segregation control between 1.0-1.15, and Mn element center degree of segregation controls between 1.0-1.2.
Such as, the process realizing low overheat casting comprises: control steel inclusion, prevent the nozzle clogging of low overheat casting cycle; Accurate control casting process molten steel temperature in tundish is stablized; Make steel the stability contorting of a continuous casting rhythm of production.And for example, the condition of protective casting also comprises employing immersion protection tube and blowing argon gas.
Preferably, in described production method, described steel-making step comprises falls sulphur phosphorus oxygen process, and at the end of described steel-making step, sulphur is lower than 0.0025%, and phosphorus is lower than 0.0025%, and total oxygen content is lower than 0.0015%.Preferably, in described production method, described steel-making step comprises alloying process, the alloying process of steel-making step adds titanium (Ti), niobium (Nb), vanadium (V) one or more than one transition metal, these three kinds of transition elements are precipitate forming elements, with carbon, nitrogen element forms carboritride precipitate, crystal grain thinning, improve the yield strength of material, wherein a kind of element is at least used to form transition metal precipitate in the present invention, it adds alloy gross mass Fractional domination at 0.01-2%, in steel, the volume fraction of transition metal precipitate is 1%-2%, size is divided into for 15nm-150nm.When its mass fraction is less than 0.01%, precipitate amount is very few, and precipitate strengthening effect is not obvious, when the precipitate that mass fraction is a large amount of more than 2% formation worsens the plasticity of material.Such as, alloying process adds the following at least one transition metal that gross mass percentage is 0.01-2%: titanium, niobium, vanadium.Such as, described steel rolling step comprises metal precipitation process, and at the end of described steel rolling step, the volume fraction of transition metal precipitate phase is 1%-2%, and size is 15nm to 150nm; Further, the volume fraction of metal precipitate phase Al (C, N) is 0.2%-0.5%, and size is 15nm to 150nm.Carbon, nitrogen element and aluminium element form intermetallic compound Al (C, N) can crystal grain thinning, improve intensity and the plasticity of material, aluminium element mass fraction should control at 0.01-1%, the volume fraction controlling intermetallic compound precipitate in steel is 0.2%-0.5%, size is divided into for 15nm-100nm, can produce a large amount of larger-size field trash and worsen the physical properties such as the formability of material and percentage elongation when aluminium element content is more than 1%.
Preferably; casting process selects the covering slag of CaO/SiO2 type; keep certain thickness liquid slag layer thickness; timely interpolation covering slag; make the greasy property that strand and crystallizer wall keep good; prevent bleed-out and the generation of the phenomenon such as face crack, slag inclusion, the percentage by weight of the concrete composition of covering slag is: calcium oxide (CaO) 30%-40%, silica (SiO
2) 30%-40%, alundum (Al2O3) (Al
2o
3, aluminium oxide) and 5%-10%, magnesia (MgO) 5%-10%, all the other are sodium monoxide (Na
2o, sodium oxide molybdena) and fluorine (F).Such as; in described continuous casting step; described protective casting adopts covering slag to realize, and the mass percent of the composition of covering slag is: calcium oxide 30%-40%, silica 30%-40%, alundum (Al2O3) 5%-10%, magnesia 5%-10%, and surplus is sodium oxide molybdena and fluorine.Such as, the mass percent of the composition of covering slag is: calcium oxide 32%, silica 38%, alundum (Al2O3) 8%, magnesia 10%, and sodium oxide molybdena 10% and fluorine 2%.And for example, the mass percent of the composition of covering slag is: calcium oxide 39%, silica 34%, alundum (Al2O3) 5%, magnesia 9%, and sodium oxide molybdena 4% and fluorine 9%.Preferably, in described continuous casting step, adopt M-EMS to control to reduce column crystal ratio and increase equiaxed zone ratio, strand equiaxed zone ratio is more than 70%, solidification end adopts electromagnetic agitation, and be provided for continuous casting billet structure evenly and reduce carbon, phosphorus and sulphur segregation, carbon center's degree of segregation controls between 1.0-1.1, phosphorus, sulphur center segregation degree control respectively between 1.0-1.15, and manganese center segregation degree controls between 1.0-1.2.
Preferably, in described production method, in described steel rolling step, deflection is adopted to be that 10%-60% carries out predeformation cold rolling.Due to the super-high-plasticity of TWIP steel, it is a kind of effective strengthening means that increase prestrain sacrifices a certain amount of plasticity to improve TWIP steel yield strength, the yield strength of material can be significantly improved by the cold rolling prestrain of 10%-60%, during more than 60% prestrain, can cause two problems, one is that the work hardening rate of material sharply reduces, and plasticity such as the percentage elongation of material reduces, two be material anisotropic increase, thus the processability of material weakens.Preferably, deflection is adopted to be that 50% to carry out predeformation cold rolling.
And/or in described steel rolling step, comprise reply and partial, re-crystallization annealing process, its treatment temperature is between 550 to 700 degrees Celsius, and the processing time is 100 to 1000 seconds.In order to reduce the counter productive that prestrain brings to material property, material property is improved by increase reply and partial, re-crystallization continuous annealing operation, reply and partial, re-crystallization annealing in process temperature are between 550 DEG C-700 DEG C, close to the perfect recrystallization lowest temperature of steel, the processing time is 100s-1000s.After process terminates, die portions recrystallization, in crystal, dislocation density sharply declines, and because mechanical twin has good heat endurance, changes hardly in this temperature range, will obtain best yield strength and percentage elongation.When temperature is more than 700 DEG C, easily perfect recrystallization occurs, work hardening rate reduces, and the yield strength of material sharply reduces, and when temperature is less than below 550 DEG C, in crystal, dislocation density is too high, and the plasticity of material and formability are still poor.
Another example is; one has yield strength more than 1000MPa; the TWIP steel production method of uniform elongation more than 10%; by controlling harm element, total oxygen content at steelmaking process; casting process adopts protective casting; select suitable component covering slag, adopt transition metal and intermetallic alloy to form precipitate strengthening and cold rolling predeformation, comprehensive mechanical property that the techniques such as process of degenerating close to perfect recrystallization temperature improve TWIP.Wherein, TWIP steel controls below 0.0025% at steelmaking process terminal S, and P controls below 0.0025%, and total oxygen content controls below 0.0015%.Preferably; TWIP steel adopts 5 DEG C of-10 DEG C of low overheats casting in casting process; take protective casting measure; adopt M-EMS to control to reduce column crystal ratio and increase equiaxed zone ratio; strand equiaxed zone ratio is more than 70%; solidification end adopts electromagnetic agitation; make continuous casting billet structure even; reduce carbon, phosphorus and sulphur segregation simultaneously; the grading of strand central defect macroscopic view is in 0-2 level; C element center segregation degree controls between 1.0-1.1, and P, S two kinds of element segregation degree control between 1.0-1.15, and Mn element center degree of segregation controls between 1.0-1.2.Wherein, preferably, TWIP steel is carrying out the cold rolling predeformation process of deflection 10%-60%, and this process significantly improves the yield strength of TWIP steel.Wherein, preferably, it is 0.2%-0.5% that TWIP steel has volume fraction, and size distribution is 10-150 nanometer equally distributed transition intermetallic compounds precipitate phase Al (C, N) in matrix.Wherein, preferably, TWIP steel has volume fraction to be 1%-2%, size distribution be 10-100 nanometer in matrix equally distributed intermetallic compound precipitate phase Ti Nb V (C, N).Wherein, preferably, reply and partial, re-crystallization annealing in process temperature are between 550 DEG C-700 DEG C, and close to the perfect recrystallization lowest temperature of steel, the processing time is 100s-1000s.Preferably, the chemical composition of TWIP steel is expressed as with mass fraction: carbon (C): 0.2-1.0%, manganese (Mn): 10-25%, aluminium (Al): 0.02-1.0%, phosphorus (P) <0.0025%, sulphur (S) <0.0025%, nitrogen (<0.003%), containing following at least one alloying element: titanium (Ti): 0.01-1.2%, niobium (Nb): 0.01-1.2, vanadium (V): 0.01-1.2%, all the other are ferro element.
And for example, the invention belongs to Ferrous Metallurgy and metal material field, provide a kind of yield strength more than 1000MPa, simultaneously the TWIP steel production method of uniform elongation more than 10%.It controls harm element and total oxygen content in steel-making step; casting process selects suitable component covering slag; and adopt protective casting and the low pulling rate casting process of low overheat; adopt transition metal and intermetallic compound precipitation strength and cold rolling predeformation, improve the mechanical property of TWIP close to techniques such as perfect recrystallization temperature continuous annealing process; make its yield strength more than 1000MPa, uniform elongation is more than 10%.
Below again for an embodiment, it take chemical composition as the TWIP steel of Fe-22%Mn-0.6%C-1%Al-0.5%V is objective for implementation, steelmaking process makes S, P element mass fraction controls respectively 0.0025%, casting process adopts low overheat to be 10 DEG C, pulling rate is that 0.8m/min carries out protective casting, continuous casting billet is placed in the heating furnace of 1200 DEG C and heats 1 hour, then the hot rolling that finishing temperature is 900 DEG C is carried out, roll the thin plate of 3.5mm, coiling temperature is 650 DEG C, then the cold-rolled process of pre edformation 60% is carried out, lamella thickness becomes 1.4mm, continuous annealing process 1000s is carried out in the continuous annealing furnace of 750 DEG C, cold rolling base is materialsed and carries out traditional One Dimensional Quasi static stretch experiment and the sign of microstructure.
Test records the hot strength of sample more than 1150MPa, yield strength is more than 1000MPa, percentage elongation is more than 15%, V (C in steel matrix tissue is distributed in being of a size of 20-100 nano-diffusion by tem observation, and Al (C N), N) precipitate, its volume fraction is respectively 1.2% and 0.3%.Then 5% is carried out, 8%, 12%, the tension test of 15% 4 kind of differently strained level, characterizes the microstructure after strain deformation, finds that the deformation process under differently strained level has the deformation twin of certain density to produce, martensite is not found in microstructure after stretcher strain, show that sample draw-texture process only produces deformation twin, martensitic traoformation does not occur, this steel mechanical property and microstructure meet the requirement of automobile by high crash energy absorption.Compared with traditional TWIP steel production method, the TWIP steel that the present embodiment obtains, increase substantially the yield strength of material to more than 1000MPa, the uniform elongation of material controls more than 10% simultaneously, be a kind of ideal auto industry material, also can be widely used in other demand industries for special steel material.
Another embodiment of the present invention is, a kind of twin crystal inducing plasticity steel, it comprises carbon 0.2-1.0%, manganese 10-25%, aluminium 0.02-1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and gross mass percentage is the following at least one transition metal of 0.01-2%: titanium, niobium, vanadium, surplus is ferro element; Such as, gross weight is 1000kg, the carbon containing 2 to 10kg, the manganese of 100 to 250kg, by that analogy.Ratio involved by various embodiments of the present invention, if no special instructions, is mass percent.And for example, a kind of twin crystal inducing plasticity steel, it adopts arbitrary aforementioned production method to prepare, it comprises carbon 0.2-1.0%, manganese 10-25%, aluminium 0.02-1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and gross mass percentage is the following at least one transition metal of 0.01-2%: titanium, niobium, vanadium, surplus is ferro element.Preferably, described twin crystal inducing plasticity steel comprises following at least one element and consumption thereof: titanium 0.01-1.2%, niobium 0.01-1.2%, vanadium 0.01-1.2%, such as, comprise the titanium of 0.1%, the niobium of 0.5% and 0.63% vanadium; And for example, comprise the titanium of 1.1% and the niobium of 0.8%, and for example, comprise the niobium of 1.0% and the vanadium of 0.2%.The oeverall quality percentage of titanium, niobium, vanadium is 0.01-2%.
Further, embodiments of the invention can also be, each technical characteristic of the various embodiments described above, the twin crystal inducing plasticity steel be mutually combined to form and production method thereof.
It should be noted that, above-mentioned each technical characteristic continues combination mutually, is formed not in above-named various embodiment, is all considered as the scope that description of the present invention is recorded; Further, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (10)
1. a production method for twin crystal inducing plasticity steel, is characterized in that, comprises the following steps: steel-making step, continuous casting step and steel rolling step;
Under the condition of protective casting, perform described continuous casting step; Wherein, the condition of described protective casting is: adopt covering slag, carry out low overheat casting with 5 DEG C-10 DEG C, pulling rate is 0.5 to 1.5 m/min;
In described steel rolling step, adopt cold rolling predeformation, and be carry out annealing in process close to perfect recrystallization temperature.
2. production method according to claim 1, is characterized in that, in described steel rolling step, adopts deflection to be that 10%-60% carries out predeformation cold rolling.
3. production method according to claim 1, is characterized in that, in described steel rolling step, comprise reply and partial, re-crystallization annealing process, its treatment temperature is between 550 to 700 degrees Celsius, and the processing time is 100 to 1000 seconds.
4. production method according to claim 1, it is characterized in that, described steel-making step comprises falls sulphur phosphorus oxygen process, and at the end of described steel-making step, sulphur is lower than 0.0025%, and phosphorus is lower than 0.0025%, and total oxygen content is lower than 0.0015%.
5. production method according to claim 1, it is characterized in that, described steel-making step comprises alloying process, and it adds the following at least one transition metal that gross mass percentage is 0.01-2%: titanium, niobium, vanadium.
6. production method according to claim 5, it is characterized in that, described steel rolling step comprises metal precipitation process, and at the end of described steel rolling step, the volume fraction of transition metal precipitate phase is 1%-2%, and size is 15nm to 150nm; Further, the volume fraction of metal precipitate phase Al (C, N) is 0.2%-0.5%, and size is 15nm to 150nm.
7. production method according to claim 1; it is characterized in that; described protective casting adopts covering slag to realize; the mass percent of the composition of covering slag is: calcium oxide 30%-40%, silica 30%-40%, alundum (Al2O3) 5%-10%, magnesia 5%-10%, and surplus is sodium oxide molybdena and fluorine.
8. production method according to claim 1, it is characterized in that, in described continuous casting step, adopt M-EMS to control to reduce column crystal ratio and increase equiaxed zone ratio, strand equiaxed zone ratio is more than 70%, and solidification end adopts electromagnetic agitation, be provided for continuous casting billet structure evenly and reduce carbon, phosphorus and sulphur segregation, carbon center's degree of segregation controls between 1.0-1.1, and phosphorus, sulphur center segregation degree control respectively between 1.0-1.15, and manganese center segregation degree controls between 1.0-1.2.
9. a twin crystal inducing plasticity steel, it is characterized in that, adopt as arbitrary in claim 1 to 9 as described in production method preparation, it comprises carbon 0.2-1.0%, manganese 10-25%, aluminium 0.02-1.0%, phosphorus <0.0025%, sulphur <0.0025%, nitrogen <0.003%, and gross mass percentage is the following at least one transition metal of 0.01-2%: titanium, niobium, vanadium, surplus is ferro element.
10. twin crystal inducing plasticity steel according to claim 9, it is characterized in that, it comprises following at least one element and consumption thereof: titanium 0.01-1.2%, niobium 0.01-1.2%, vanadium 0.01-1.2%.
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Effective date of registration: 20171208 Address after: No. 11, group two, Xing Wang Village, Tang Ji Town, Lianshui County, Huaian, Jiangsu Patentee after: Gu Yukui Address before: 266000 Licang, Qingdao, No. nine East water road, No. 320, No. Patentee before: QINGDAO YULANXIANG BUSINESS SERVICE Co.,Ltd. |
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Address after: 210000 Jinlun Xintiandi, No. 8 Hanzhong Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Gu Yukui Address before: 223001 No. 11, Group II, Xingwang Village, Tangji Town, Lianshui County, Huaian City, Jiangsu Province Patentee before: Gu Yukui |
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Effective date of registration: 20191112 Address after: Room 2, west of the second floor, No. 355, Huanbei West Road, Weitang street, Jiashan County, Jiaxing City, Zhejiang Province Patentee after: Jiashan Weitang Asset Management Co.,Ltd. Address before: 210000 Jinlu new world, 8 Hanzhoung Road, Gulou District, Nanjing, Jiangsu. Patentee before: Gu Yukui |
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Denomination of invention: Twin induced plasticity steel and its production method Effective date of registration: 20210531 Granted publication date: 20160831 Pledgee: Weitang sub branch of Zhejiang Jiashan Rural Commercial Bank Co.,Ltd. Pledgor: Jiashan Weitang Asset Management Co.,Ltd. Registration number: Y2021980004130 |
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Date of cancellation: 20231018 Granted publication date: 20160831 Pledgee: Weitang sub branch of Zhejiang Jiashan Rural Commercial Bank Co.,Ltd. Pledgor: Jiashan Weitang Asset Management Co.,Ltd. Registration number: Y2021980004130 |
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Denomination of invention: A twinning induced plasticity steel and its production method Effective date of registration: 20231127 Granted publication date: 20160831 Pledgee: Weitang sub branch of Zhejiang Jiashan Rural Commercial Bank Co.,Ltd. Pledgor: Jiashan Weitang Asset Management Co.,Ltd. Registration number: Y2023330002807 |