CN106119716A - The cold-rolled galvanized duplex steel of a kind of plasticity enhancing and production method thereof - Google Patents
The cold-rolled galvanized duplex steel of a kind of plasticity enhancing and production method thereof Download PDFInfo
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- CN106119716A CN106119716A CN201610440085.4A CN201610440085A CN106119716A CN 106119716 A CN106119716 A CN 106119716A CN 201610440085 A CN201610440085 A CN 201610440085A CN 106119716 A CN106119716 A CN 106119716A
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- 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
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
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- 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses cold-rolled galvanized duplex steel and production method thereof that a kind of plasticity strengthens, the chemical composition of described dual phase steel is by weight percentage: C:0.12%～0.18%；Si:0.3% 0.6%；Mn:1.3%～2.3%；P :≤0.01%；S :≤0.01%；Al:0.4%～0.9%, remaining is Fe and inevitable impurity, solve and how on the basis of meeting requirement of strength, to reduce alloy or process costs, improve the technical problem of galvanizing surface quality, reached to reduce cost of alloy, the technique effect of raising galvanizing surface quality.
Description
Technical field
The present invention relates to Steel material technical field, the cold-rolled galvanized duplex steel strengthened particularly to a kind of plasticity and life thereof
Product method.
Background technology
In order to automobile lightweight energy-saving and emission-reduction, vehicle safety improve, advanced high-strength steel application in body in white
Growing with each passing day, wherein dual phase steel is due to the maximum steel of application amount in good comprehensive mechanical property has become as advanced high-strength steel
Kind.But, numerous Automobile Enterprises in use recognize that traditional dual phase steel shapes on many high drawability parts
Difficulty, it is difficult to meet the punching structure part that Automobile Design is complicated.And if use TRIP steel, because its alloy content is higher, exist
The problems such as welding performance is the best, and elongation percentage surplus capacity can cause the most again waste.
Along with the increase of automobile component requirement of strength, the requirement to material molding also accordingly increases.Traditional TRIP steel
Because its alloy content is higher, there is the problems such as welding performance is the best, and elongation percentage surplus capacity is big, can produce unnecessary waste.
It addition, traditional galvanizing TRIP steel is in order to avoid the harmful effect to galvanizing surface quality of the Si content, mainly adopt
Be C-Al-Mn system.But after using Al to replace Si, galvanizing TRIP steel lacks the solid solution strengthening effect of Si element, generally
Intensity in order to avoid therefore producing is not enough, adds again the elements such as Cu, Nb, V, Ti, P, and the cost causing alloy or technique increases
Add.It addition, Al constituent content increases, also easily cause in casting process the problems such as nozzle blocking and affect production.
Summary of the invention
The present invention provides the cold-rolled galvanized duplex steel and production method thereof that a kind of plasticity strengthens, and solves and how to meet
Reduce alloy or process costs on the basis of requirement of strength, improve the technical problem of galvanizing surface quality, reached reduction alloy
Cost, the technique effect of raising galvanizing surface quality.
For solving above-mentioned technical problem, the invention provides the cold-rolled galvanized duplex steel that a kind of plasticity strengthens, described double
The chemical composition of phase steel is by weight percentage:
C:0.12%～0.18%；Si:0.3%-0.6%；Mn:1.3%～2.3%；P :≤0.01%；S :≤
0.01%；Al:0.4%～0.9%, remaining is Fe and inevitable impurity.
Preferably, the metallographic structure of described dual phase steel includes ferrite and martensite.
Preferably, the metallographic structure of described dual phase steel also includes retained austenite.
Preferably, the content of described retained austenite is 3%～7%.
Based on same inventive concept, the application also provides for the producer of the cold-rolled galvanized duplex steel that a kind of plasticity strengthens
Method, for producing above-mentioned dual phase steel, described production method includes:
To smelting molten steel and cast continuous casting billet；
To described continuous casting billet hot rolling, it is thus achieved that hot rolled plate；
Cold rolling to described hot rolled plate, it is thus achieved that chill strip steel；
Described chill strip steel is annealed, obtains described dual phase steel.
Preferably, described smelting also casts continuous casting billet, particularly as follows: by molten steel through converter smelting, and use continuous casting mode to cast
Steel.
Preferably, the heating-up temperature of described hot rolling is 1210 DEG C～1300 DEG C, the finishing temperature of described hot rolling be 850 DEG C～
890 DEG C, the coiling temperature of described hot rolling is 620 DEG C～680 DEG C.
Preferably, the preheating temperature of described annealing is 200 DEG C～240 DEG C, and heating-up temperature is 770 DEG C～810 DEG C, soaking temperature
Degree is 770 DEG C～810 DEG C, and slow cooling outlet temperature is 680 DEG C～710 DEG C, and rapid cooling outlet temperature is 450 DEG C～470 DEG C, zinc-plated temperature
Degree is 450 DEG C～470 DEG C, and finishing elongation percentage is 0.2%～0.5%.
Preferably, in described annealing process, dew point controls at-20 DEG C～-10 DEG C.
The application has the beneficial effect that:
The cold-rolled galvanized duplex steel of the plasticity enhancing that the application provides and production method thereof, use C-Si-Mn-Al alloy
System Design, on the premise of meeting requirement of strength, reduces cost in the situation without other alloying elements；By introducing
A certain amount of retained austenite produces TRIP effect, improves the elongation percentage of dual phase steel, to adapt to have complicated draw forming demand
Auto parts produce, solve on the basis of meeting requirement of strength, how to reduce alloy or process costs, improve zinc-plated table
The technical problem of face quality, has reached to reduce cost of alloy, the technique effect of raising galvanizing surface quality.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is only some of the present invention
Embodiment.
Fig. 1 is the metallographic structure figure of the cold-rolled galvanized duplex steel that a kind of plasticity of the application better embodiment strengthens；
Fig. 2 is the EBSD analysis chart of the cold-rolled galvanized duplex steel that plasticity strengthens in Fig. 1；
Fig. 3 is the tem analysis figure of the cold-rolled galvanized duplex steel that plasticity strengthens in Fig. 1；
Fig. 4 is the production method of the cold-rolled galvanized duplex steel that the application a kind of plasticity of another better embodiment strengthens
Flow chart.
Detailed description of the invention
The embodiment of the present application, by providing cold-rolled galvanized duplex steel and the production method thereof of the enhancing of a kind of plasticity, solves
How on the basis of meeting requirement of strength, to reduce alloy or process costs, improve the technical problem of galvanizing surface quality, reach
Reduce cost of alloy, improve the technique effect of galvanizing surface quality.
Technical scheme in the embodiment of the present application is for solving above-mentioned technical problem, and general thought is as follows:
The cold-rolled galvanized duplex steel that a kind of plasticity strengthens, the chemical composition of described dual phase steel is by weight percentage:
C:0.12%～0.18%；Si:0.3%-0.6%；Mn:1.3%～2.3%；P :≤0.01%；S :≤
0.01%；Al:0.4%～0.9%, remaining is Fe and inevitable impurity.
The application uses C-Si-Mn-Al alloy system to design, on the premise of meeting requirement of strength, without other
The situation of alloying element reduces cost；Produce TRIP effect by introducing a certain amount of retained austenite, improve dual phase steel
Elongation percentage, to adapt to the auto parts production with complicated draw forming demand.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail.
Embodiment one
In order to solve the technical problem that in prior art, steel strength requirement and cost of alloy can not meet, the application simultaneously
The cold-rolled galvanized duplex steel that a kind of plasticity strengthens is provided.
The chemical composition of described dual phase steel is by weight percentage:
C:0.12%～0.18%；Si:0.3%-0.6%；Mn:1.3%～2.3%；P :≤0.01%；S :≤
0.01%；Al:0.4%～0.9%, remaining is Fe and inevitable impurity.
The cold rolling hot dip galvanizing that the metallographic structure figure of cold-rolled galvanized duplex steel that described plasticity strengthens, described plasticity strengthen is double
The tem analysis figure of the metallographic of the cold-rolled galvanized duplex steel that the EBSD analysis chart of the metallographic of phase steel and described plasticity strengthen, such as Fig. 1
To shown in Fig. 3.
Above-mentioned main alloy element effect and the scope of restriction are as follows:
Carbon C: carbon is most important solution strengthening element and austenite stabilizer element in dual phase steel, in order in cooling
During obtain enough martensite volumes to ensure the intensity of different stage dual phase steel, and obtain a certain amount of retained austenite
Amount, the carbon element content that the present invention uses is 0.12%～0.18%.
Silicon Si: element silicon contributes to expanding two-phase section, is dissolved in ferrite and plays strengthening effect, and element silicon can have simultaneously
Effect is decomposed and Carbide Precipitation by suppression retained austenite, thus provides powerful guarantee for TRIP effect.In order to reduce element silicon pair
Welding performance and the impact of surface quality, the silicon content that the present invention uses is 0.3%～0.6%.
Manganese Mn: manganese element is also the important element of solution strengthening, stable austenite, and dual phase steel strengthening is had important work
With, for obtaining varying strength rank, the manganese element content that the present invention uses is 1.3%～2.3%.
Phosphorus P: P elements, as harmful element, will cause grain-boundary strength to decline at Grain Boundary Segregation thus deteriorate material mechanical
Performance, the phosphorus element content that the present invention uses controls below 0.01%.
Sulfur S: element sulphur is as harmful element, and element sulphur mainly prevents being combined generation MnS with Mn thus deteriorates material property,
The sulfur content that the present invention uses controls below 0.01%.
Aluminum Al: aluminium element effect is similar to Si, can effectively suppress retained austenite to decompose and Carbide Precipitation, but aluminum is first
The problems such as the too high easy generation casting process nozzle blocking of cellulose content, the aluminium element content that the present invention uses is 0.4～0.9%.
Preferably, main alloy element effect and the scope of restriction that the application provides are as follows, refer to table 1:
Table 1 dual phase steel chemical composition (wt%)
| Embodiment | C | Si | Mn | P | S | Al |
| 1 | 0.135 | 0.41 | 1.61 | 0.009 | 0.005 | 0.48 |
| 2 | 0.129 | 0.38 | 1.62 | 0.008 | 0.004 | 0.49 |
| 3 | 0.171 | 0.42 | 2.17 | 0.007 | 0.004 | 0.73 |
| 4 | 0.168 | 0.41 | 2.22 | 0.009 | 0.003 | 0.77 |
The mechanical property of described dual phase steel specifically includes, and refers to table 2 Mechanical Properties of Dual Phase Steels table.
Table 2 Mechanical Properties of Dual Phase Steels table
| Embodiment | Rm/MPa | Rp0.2/MPa | A80/% |
| DP590 is in kind | 639 | 387 | 23.0 |
| DP780 is in kind | 804 | 498 | 14.0 |
| 1 | 619 | 383 | 29.0 |
| 2 | 624 | 390 | 28.5 |
| 3 | 803 | 501 | 19.5 |
| 4 | 812 | 508 | 19.0 |
In table 2, embodiment 1 to embodiment 4 is the cold-rolled galvanized duplex steel that described plasticity strengthens, and DP590 is in kind and
DP780 material object is common dual phase steel, and embodiment 1 and embodiment 2 intensity rank are 590MPa and traditional DP590 material object ratio
Relatively, it is clear that the cold-rolled galvanized duplex steel that the plasticity that intensity rank is 590MPa that embodiment 1 and embodiment 2 provide strengthens with
Traditional DP590 material object A80 elongation percentage improves 20-40%；Embodiment 3 and embodiment semi-finals degree rank are that 780MPa is with traditional
DP780 material object compares, it is clear that the cold rolling hot dip that the plasticity that intensity rank is 780MPa that embodiment 1 and embodiment 2 provide strengthens
Zinc dual phase steel improves 20-40% with traditional DP780 material object A80 elongation percentage.
The metallographic structure of the cold-rolled galvanized duplex steel that the plasticity that the application provides strengthens includes ferrite and martensite.Institute
The metallographic structure stating dual phase steel also includes retained austenite.In the present embodiment, the content of described retained austenite be 3%～
7%, it is preferred that the content of described retained austenite is 4%～6%.Produce certain TRIP effect during deformation thus produce ratio
The tradition more preferable plasticity of dual phase steel, A80 elongation percentage improves 20-40%.
The application uses C-Si-Mn-Al alloy system to design, on the premise of meeting requirement of strength, without other
The situation of alloying element reduces cost；Produce TRIP effect by introducing a certain amount of retained austenite, improve dual phase steel
Elongation percentage, to adapt to the auto parts production with complicated draw forming demand.
Embodiment two
Based on same inventive concept, the application also provides for the producer of the cold-rolled galvanized duplex steel that a kind of plasticity strengthens
Method, the cold-rolled galvanized duplex steel that the described plasticity in production example one strengthens.As shown in Figure 4, described plasticity increases
The production method of strong cold-rolled galvanized duplex steel, refers to Fig. 4, and described production method comprises the following steps:
Step 110, to smelting molten steel and cast continuous casting billet.
Specifically, described to smelting molten steel and cast continuous casting billet, it is specially molten steel through converter smelting, and uses Continuous Casting Square
Formula cast steel.Described molten steel is the molten steel of the cold-rolled galvanized duplex steel that above-mentioned plasticity strengthens.
Step 120, to described continuous casting billet hot rolling, it is thus achieved that hot rolled plate.
Specifically, the heating-up temperature of described hot rolling is 1210 DEG C～1300 DEG C, the finishing temperature of described hot rolling be 850 DEG C～
890 DEG C, the coiling temperature of described hot rolling is 620 DEG C～680 DEG C.Table 3 is dual phase steel hot rolling technology embodiment.
Table 3 dual phase steel hot rolling technology embodiment
| Embodiment | Heating-up temperature | Finishing temperature | Coiling temperature | Hot rolled thickness | Cold-rolling thickness |
| 1 | 1257℃ | 883℃ | 665℃ | 3.5mm | 1.2mm |
| 2 | 1263℃ | 874℃ | 659℃ | 3.5mm | 1.2mm |
| 3 | 1258℃ | 879℃ | 668℃ | 3.5mm | 1.2mm |
| 4 | 1250℃ | 865℃ | 650℃ | 3.5mm | 1.2mm |
Step 130, carries out cold rolling to described hot rolled plate, it is thus achieved that chill strip steel.
Step 140, anneals to described chill strip steel, obtains described dual phase steel.
Specifically, the preheating temperature of described annealing is 200 DEG C～240 DEG C, and heating-up temperature is 770 DEG C～810 DEG C, soaking temperature
Degree is 770 DEG C～810 DEG C, and slow cooling outlet temperature is 680 DEG C～710 DEG C, and rapid cooling outlet temperature is 450 DEG C～470 DEG C, zinc-plated temperature
Degree is 450 DEG C～470 DEG C, and finishing elongation percentage is 0.2%～0.5%, and in described annealing process, dew point controls at-20 DEG C～-10
℃。
Preferably, the heating-up temperature of described annealing is specially 780 DEG C～800 DEG C, and the soaking temperature of described annealing is specially
780 DEG C～800 DEG C.Wherein, table 4 is the embodiment of dual phase steel annealing process.
The embodiment of table 4 dual phase steel annealing process
Through dual phase steel prepared by above-mentioned production technology, retained austenite introduces in TRIP effect so that described dual phase steel
Compared to tradition dual phase steel, there is more preferable elongation percentage, refer to table 5.
The intensity embodiment of the dual phase steel after table 5 process
| Embodiment | Rm/MPa | Rp0.2/MPa | A80/% |
| DP590 is in kind | 639 | 387 | 23.0 |
| DP780 is in kind | 804 | 498 | 14.0 |
| 1 | 619 | 383 | 29.0 |
| 2 | 624 | 390 | 28.5 |
| 3 | 803 | 501 | 19.5 |
| 4 | 812 | 508 | 19.0 |
Embodiment 1 to embodiment 4 is the cold-rolled galvanized duplex steel that described plasticity strengthens, and DP590 is in kind and DP780 is real
Thing is common dual phase steel, and embodiment 1 and embodiment 2 intensity rank are that 590MPa compares with traditional DP590 material object, it is clear that
The cold-rolled galvanized duplex steel that the plasticity that intensity rank is 590MPa that embodiment 1 and embodiment 2 provide strengthens is with traditional
DP590 material object A80 elongation percentage improves 20-40%；Embodiment 3 and embodiment semi-finals degree rank are that 780MPa and traditional DP780 is real
Thing compares, it is clear that the cold rolling hot dip galvanizing two-phase that the plasticity that intensity rank is 780MPa that embodiment 1 and embodiment 2 provide strengthens
Steel improves 20-40% with traditional DP780 material object A80 elongation percentage.
Produce certain TRIP effect during the cold-rolled galvanized duplex steel deformation that described plasticity strengthens thus produce than tradition
The more preferable plasticity of dual phase steel, A80 elongation percentage improves 20-40%
Example one
Using 220 tons of converter smeltings in example one, the hot rolling target thickness of steel plate finished product is 3.5mm, and cold-rolling thickness is
1.2mm, concretely comprising the following steps of smelting:
S1: to smelting molten steel and cast continuous casting billet；Smelting process strictly controls P, S content, it is ensured that slab quality.Strand
Chemical composition is as follows: calculate C:0.135wt% by percentage to the quality；Si:0.41wt%；Mn:1.61wt%；P:0.009wt%；
S:0.005wt%；Al:0.48wt%；, remaining is Fe and inevitable impurity.
S2: to described continuous casting billet hot rolling, it is thus achieved that hot rolled plate；The heating-up temperature of described hot rolling is 1257 DEG C, described hot rolling
Finishing temperature is 883 DEG C, and the coiling temperature of described hot rolling is 665 DEG C.Steel plate thickness after hot rolling is 3.5mm.
S3: described hot rolled plate is carried out cold rolling, it is thus achieved that chill strip steel；Described cold rolling after steel plate thickness be 1.2mm.
S4: described chill strip steel is annealed, obtains described dual phase steel.The preheating temperature of described continuous annealing process is 220
DEG C, heating-up temperature is 780 DEG C, and soaking temperature is 780 DEG C, and slow cooling outlet temperature is 690 DEG C, and rapid cooling outlet temperature is 460 DEG C, plating
Zinc temperature is 460 DEG C, and finishing elongation percentage is 0.3%, and dew point controls at-10 DEG C.
The mechanical property of the dual phase steel finally given through above-mentioned steps be Rm be 619MPa, Rp0.2 be 383MPa, A80
It is 29.0%.
Fig. 1 is the micro-organization chart of described dual phase steel, as seen from Figure 1 containing Lycoperdon polymorphum Vitt ferrite, brilliant white in tissue
Martensite, retained austenite and a small amount of black bainite.
Fig. 2 is the EBSD analysis result of dual phase steel described in Fig. 1, and RED sector is retained austenite.Retained austenite in
Graininess, is mainly distributed on crystal boundary, is distributed in ferrite intracrystalline on a small quantity, utilizes EBSD to add up its content, and retained austenite exists
5.1%.
Example two
Using 220 tons of converter smeltings in example two, the hot rolling target thickness of steel plate finished product is 3.5mm, and cold-rolling thickness is
1.2mm, concretely comprising the following steps of smelting:
S1: to smelting molten steel and cast continuous casting billet；Smelting process strictly controls P, S content, it is ensured that slab quality.Strand
Chemical composition is as follows: calculate C:0.129wt% by percentage to the quality；Si:0.38wt%；Mn:1.62wt%；P:0.008wt%；
S:0.004wt%；Al:0.49wt%；, remaining is Fe and inevitable impurity.
S2: to described continuous casting billet hot rolling, it is thus achieved that hot rolled plate；The heating-up temperature of described hot rolling is 1263 DEG C, described hot rolling
Finishing temperature is 874 DEG C, and the coiling temperature of described hot rolling is 659 DEG C.Steel plate thickness after hot rolling is 3.5mm.
S3: described hot rolled plate is carried out cold rolling, it is thus achieved that chill strip steel；Described cold rolling after steel plate thickness be 1.2mm.
S4: described chill strip steel is annealed, obtains described dual phase steel.The preheating temperature of described continuous annealing process is 220
DEG C, heating-up temperature is 800 DEG C, and soaking temperature is 800 DEG C, and slow cooling outlet temperature is 700 DEG C, and rapid cooling outlet temperature is 460 DEG C, plating
Zinc temperature is 460 DEG C, and finishing elongation percentage is 0.3%, and dew point controls at-20 DEG C.
The mechanical property of the dual phase steel finally given through above-mentioned steps be Rm be 624MPa, Rp0.2 be 390MPa, A80
It is 28.5%.
In the microstructure of the dual phase steel that example two obtains containing Lycoperdon polymorphum Vitt ferrite, brilliant white martensite, retained austenite and
A small amount of black bainite.
The EBSD analysis result of the dual phase steel in example two, retained austenite is mainly distributed on crystal boundary, is distributed in ferrum on a small quantity
Ferritic intracrystalline, utilizes EBSD to add up its content, and retained austenite is substantially 4.3%.
The details in a play not acted out on stage, but told through dialogues phase of the retained austenite of dual phase steel described in example two is similar in its form example one.
Example three
Using 220 tons of converter smeltings in example three, the hot rolling target thickness of steel plate finished product is 3.5mm, and cold-rolling thickness is
1.2mm, concretely comprising the following steps of smelting:
S1: to smelting molten steel and cast continuous casting billet；Smelting process strictly controls P, S content, it is ensured that slab quality.Strand
Chemical composition is as follows: calculate C:0.171wt% by percentage to the quality；Si:0.42wt%；Mn:2.17wt%；P:0.007wt%；
S:0.004wt%；Al:0.73wt%；, remaining is Fe and inevitable impurity.
S2: to described continuous casting billet hot rolling, it is thus achieved that hot rolled plate；The heating-up temperature of described hot rolling is 1258 DEG C, described hot rolling
Finishing temperature is 879 DEG C, and the coiling temperature of described hot rolling is 668 DEG C.Steel plate thickness after hot rolling is 3.5mm.
S3: described hot rolled plate is carried out cold rolling, it is thus achieved that chill strip steel；Described cold rolling after steel plate thickness be 1.2mm.
S4: described chill strip steel is annealed, obtains described dual phase steel.The preheating temperature of described continuous annealing process is 220
DEG C, heating-up temperature is 780 DEG C, and soaking temperature is 780 DEG C, and slow cooling outlet temperature is 690 DEG C, and rapid cooling outlet temperature is 460 DEG C, plating
Zinc temperature is 460 DEG C, and finishing elongation percentage is 0.4%, and dew point controls at-10 DEG C.
The mechanical property of the dual phase steel finally given through above-mentioned steps be Rm be 803MPa, Rp0.2 be 501MPa, A80
It is 19.5%.
Containing Lycoperdon polymorphum Vitt ferrite, brilliant white martensite, residual austenite in the microstructure of the described dual phase steel that example three obtains
Body and a small amount of black bainite.
And wherein retained austenite is in granular form, it is mainly distributed on crystal boundary, is distributed in ferrite intracrystalline on a small quantity, utilize
EBSD adds up its content, and retained austenite is substantially 5.5%.
The application has the beneficial effect that:
The cold-rolled galvanized duplex steel of the plasticity enhancing that the application provides and production method thereof, by using C-Si-Mn-Al
Alloy system designs, and on the premise of meeting requirement of strength, reduces cost in the situation without other alloying elements；Pass through
Introduce a certain amount of retained austenite and produce TRIP effect, improve the elongation percentage of dual phase steel, to adapt to there is complicated draw forming
The auto parts of demand produce, and solve and how to reduce alloy or process costs on the basis of meeting requirement of strength, improve plating
The technical problem of zinc surface quality, has reached to reduce cost of alloy, the technique effect of raising galvanizing surface quality.
It should be noted last that, above detailed description of the invention only in order to technical scheme to be described and unrestricted,
Although the present invention being described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should be contained
In the middle of scope of the presently claimed invention.
Claims (9)
1. the cold-rolled galvanized duplex steel that a plasticity strengthens, it is characterised in that the chemical composition of described dual phase steel by weight hundred
Proportion by subtraction is:
C:0.12%～0.18%；Si:0.3%-0.6%；Mn:1.3%～2.3%；P :≤0.01%；S :≤0.01%；Al:
0.4%～0.9%, remaining is Fe and inevitable impurity.
2. dual phase steel as claimed in claim 1, it is characterised in that the metallographic structure of described dual phase steel includes ferrite and geneva
Body.
3. dual phase steel as claimed in claim 2, it is characterised in that the metallographic structure of described dual phase steel also includes residual austenite
Body.
4. dual phase steel as claimed in claim 3, it is characterised in that the content of described retained austenite is 3%～7%.
5. a production method for the cold-rolled galvanized duplex steel that plasticity strengthens, for producing as described in Claims 1-4 is arbitrary
Dual phase steel, it is characterised in that described production method includes:
To smelting molten steel and cast continuous casting billet；
To described continuous casting billet hot rolling, it is thus achieved that hot rolled plate；
Cold rolling to described hot rolled plate, it is thus achieved that chill strip steel；
Described chill strip steel is annealed, obtains described dual phase steel.
6. production method as claimed in claim 5, it is characterised in that described smelting also casts continuous casting billet, particularly as follows:
By molten steel through converter smelting, and use continuous casting mode cast steel.
7. production method as claimed in claim 5, it is characterised in that the heating-up temperature of described hot rolling is 1210 DEG C～1300
DEG C, the finishing temperature of described hot rolling is 850 DEG C～890 DEG C, and the coiling temperature of described hot rolling is 620 DEG C～680 DEG C.
8. production method as claimed in claim 5, it is characterised in that the preheating temperature of described annealing is 200 DEG C～240 DEG C,
Heating-up temperature is 770 DEG C～810 DEG C, and soaking temperature is 770 DEG C～810 DEG C, and slow cooling outlet temperature is 680 DEG C～710 DEG C, rapid cooling
Outlet temperature is 450 DEG C～470 DEG C, and zinc-plated temperature is 450 DEG C～470 DEG C, and finishing elongation percentage is 0.2%～0.5%.
9. production method as claimed in claim 8, it is characterised in that in described annealing process, dew point controls at-20 DEG C～-10
℃。
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant before: Capital Iron & Steel General Company |
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Application publication date: 20161116 |