CN106399857A - Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level - Google Patents

Production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level Download PDF

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CN106399857A
CN106399857A CN201610867492.3A CN201610867492A CN106399857A CN 106399857 A CN106399857 A CN 106399857A CN 201610867492 A CN201610867492 A CN 201610867492A CN 106399857 A CN106399857 A CN 106399857A
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cold
steel
tensile strength
production method
rolling
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CN106399857B (en
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马二清
崔磊
刘永刚
詹华
陈乐�
张宇光
刘启龙
李德超
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Magang Group Holding Co Ltd
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Magang Group Holding Co Ltd
Maanshan Iron and Steel Co Ltd
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • 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
    • C21D8/0226—Hot 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
    • C21D8/0221—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
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • C21D2211/008—Martensite

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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)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention relates to a production method for Si-contained cold-rolling hot galvanizing dual-phase steel with tensile strength reaching 800MPa level. The cold-rolling hot galvanizing dual-phase steel comprises, by mass, 0.08%-0.12% of C, 0.10%-0.18% of Si, 1.5%-2.5% of Mn, 0.2%-0.4% of Cr, 0.12%-0.20% of Mo, 0.03%-0.06% of Als, 0-0.015% of P, 0-0.04% of S, 0-0.005% of N, and the balance Fe and inevitable impurities. Due to the fact that chemical component design is combined with cold rolling, hot rolling, continuous annealing and hot galvanizing technical control, stable production of steel plates can be guaranteed. According to the steel produced through the method, yield strength is 426MPa-540MPa, tensile strength is larger than or equal to 800MPa, and the ductility is larger than or equal to 15%. The production method has the characteristics that cost is low, equipment is simple and product application performance is good.

Description

A kind of tensile strength 800MPa level contains the production method of the cold-rolled galvanized duplex steel of Si
Technical field
The present invention relates to cold rolling hot dip galvanizing automobile steel manufactures field and in particular to a kind of tensile strength 800MPa level contains Si Cold-rolled galvanized duplex steel production method.
Background technology
With the development of auto industry, energy-saving, increase safety and reliability, raising car body corrosion resisting property have become use The generally pursuit at family, has become the inexorable trend of automobile steel development using high-strength galvanized sheet.
Dual phase steel is the high-strength steel that current automobile industry is most widely used, and automobile dual phase steel is different according to processing route It is divided into hot-rolled dual-phase steel, cold-rolled biphase steel and cold-rolled galvanized duplex steel etc., wherein to have the ferrite/geneva of duplex structure Body dual phase steel is most representative.Because Galvanized Dual Phase Steel not only has cold-rolled biphase steel high intensity, low yield strength ratio and good formability, Also there is good antiseptic property, study at present and apply most and the most ripe zinc-plated DP600.With auto industry to subtracting The important raising further asked, tensile strength can ensure peace in the superhigh intensity Galvanized Dual Phase Steel of 800MPa and its above rank Entirely, reduce parts thickness on the premise of corrosion resisting property, realize greatly automotive light weight technology.Zinc-plated DP800 is main at present Be applied to door anti-collision joist, seat support, safety member and the structural member such as floor beams.
By rational composition and technological design it is ensured that tissue in ferrite and martensite content and proportioning, control horse Family name's body and ferrite disperse degree and distribution, thus obtain 800MPa level two-phase product made from steel of good performance of science, simultaneously The impact to Coating of composition to be considered and technique.During exploitation 800MPa grade high-strength cold-rolled galvanized duplex steel, by closing The composition of reason and technological design it is ensured that the requirement of Mechanical Properties of Dual Phase Steels, weldability, forming property and excellent surface quality, Reduce the usage amount reduces cost of microalloy element simultaneously as far as possible.
Carry out patent retrieval for 800MPa level Galvanized Dual Phase Steel, composition is with present invention contrast as shown in table 1.Each invention Feature is specific as follows：
In the patent of Application No. CN01807327.1, it discloses high strength dual phase sheet metal and high strength dual phase plating Sheet metal and its manufacture method, the wherein chemical composition for 780MPa level dual phase steel flat cold-rolled sheet are：C：0.04%, Si： 0.7%, Mn：2.6%, V：0.02%～0.06%, Nb：0.01%～0.12%, Ti：0.01%～0.12%, S≤ 0.055%, P≤0.040%, Als：0.04%, balance of Fe；Pass through silicon low-carbon high in this patent and interpolation Nb, V, Ti is micro- The composition design thinking that one or more of alloy is carried out, obtains a kind of thin steel of high intensity with good drawability Plate.Its zincincation is partial to electrogalvanizing, would generally cause Coating degradation for high Si (Si >=0.20%).This article In do not indicate how to avoid the concrete scheme of this problem, but commonly used pre-oxidation-reduction technique or surface flash at present Method solve high Si surface oxidation.
The patent documentation of Application No. CN200410084680.6 disclose a kind of 800MPa cold-rolled galvanized duplex steel and Its manufacture method, steel plate chemical composition degree is：C：0.06～0.18%, Si≤0.40%, Mn：1.3～2.5%, Cr：0.1～1.0%, Mo：0.02～0.5%, Nb：0.005%～0.03%, Ti：0.005～0.05%, S ＜ 0.01%, P+ 2S≤0.12%, C+Si/30+Mn/20≤0.24%, T.Al：0.02～0.05%, balance of Fe and inevitable impurity.Move back Fiery temperature is 800～860 DEG C, preferably 815～840 DEG C of recrystallization annealing temperature.
The patent documentation of Application No. CN201110439563.7 discloses a kind of 780MPa grade cold rolling hot dip galvanizing dual phase steel And preparation method thereof, its chemical composition is：C：0.10～0.15%, Si:≤ 0.05%, Mn：1.8～2.0%, Cr：0.2～ 0.35%, Nb：0.03%～0.04%, Mo：0.2%～0.25%, S ＜ 0.01%, P ＜ 0.01%, Alt：0.02～ 0.07%, N：≤ 0.005% balance of Fe and impurity.In this patent, recrystallization annealing temperature is 790～830 DEG C, is first cooled to 720 DEG C～760 DEG C, then blow again and be cooled to 450 DEG C～460 DEG C of zinc-plated temperature soon.
The patent documentation of Application No. CN201510968633.6 discloses a kind of 800MPa level car Galvanized Dual Phase Steel And production method, its chemical composition is：C：0.06～0.010%, Si：≤ 0.1%, Mn：1.5%～2.5%, Cr：0.02% ～0.9% or Mo：0.01%～0.30%, P≤0.015%, S≤0.010%, N：≤ 0.005%, Nb：0.001%～ 0.03%, Als：0.01%～0.08%.Crucial annealing temperature is 790 DEG C～850 DEG C.
The synopsis (wt%) that table 1 present component system is invented with other
Namely there are the following problems in prior art：Galvanized Dual Phase Steel not only have cold-rolled biphase steel high intensity, low bend strong Than with good formability, also there is good antiseptic property, extensive as typical trade mark 800MPa level hot dip galvanized dual phase steel Be applied to door anti-collision joist, seat support, safety member and the structural member such as floor beams.Generally high Si component system needs to adopt at present Avoid the surface quality that high Si causes poor with the mode such as pre-oxidation-reduction technique or flash Ni, higher to equipment requirements, lead to Often need scrap build or newly-built producing line just to enable, and improvement cost is higher, be not easy to realize.In addition no Si becomes split System, makes up the effect of Si by needing to add the alloy such as Cr, Mo, Nb, Ti, thus realizing good combination property and good Surface quality.Virtually increasing cost, the interpolation of multiple alloying elements simultaneously is to technology controlling and process it is also proposed that higher requirement for this.
Content of the invention
For above prior art problem, it is an object of the invention to provide a kind of tensile strength 800MPa level contains the cold of Si Roll the production method of hot dip galvanized dual phase steel, by, on the premise of ensureing coating surface quality, increasing cost as far as possible relatively low Si element addition, it is to avoid the interpolation of other relatively costly alloying elements, steel-making region adopt LF+RH duplex control protect Card composition accurately hits, and controls inclusion content, and continuous casting zone adopts the advanced production technology such as dynamic soft-reduction and electromagnetism roller, subtracts Few strand component segregation and the defect of center porosity, anti-coordinating rational hot rolling, continuous annealing process and zincincation to be obtained in that Tensile strength more than 780MPa, elongation percentage be higher than 14% high intensity Galvanized Dual Phase Steel it is ensured that good mechanical property and coating Quality, formability and welding performance.Concrete technical scheme is as follows：
A kind of tensile strength 800MPa level contains the cold-rolled galvanized duplex steel of Si, and its chemical composition mass percent is：C： 0.08～0.12%, Si：0.10～0.18%, Mn：1.5～2.5%, Cr：0.2～0.4%, Mo：0.12～0.20%, Als： 0.03-0.06%, P≤0.015%, S≤0.04%, N：≤ 0.005%, balance of Fe and inevitable impurity.
The preparation technology that above-mentioned tensile strength 800MPa level contains the cold-rolled galvanized duplex steel of Si comprises the steps：
(1) smelt and solidification；
(2) hot continuous rolling of strand or ingot casting；
(3) pickling and cold-rolling；
(4) continuous annealing is zinc-plated.
Further, further include step (5)：Alloying.
Further, adopt converter, electric furnace and induction furnace to smelt in step (1), and adopt continuous casting strand.
Further, in step (2), strand is heated through 1200～1250 DEG C, 5-7 passes is carried out by roughing mill, Hot rolling, to 20-40mm thickness specification, carries out 5-7 passes by hot tandem, is rolled to after target thickness in 620-670 DEG C of model Carry out in enclosing coiling into coil of strip.
Further, in step (3), by hot-strip through hydrochloric acid trough pickling, after removing scale on surface, carry out cold company Roll or cold rolling, cold rolling reduction ratio >=50%, be rolled to target thickness.
Further, comprise the steps in step (4)：
(4-1) cold-strip steel is heated slowly to 180 DEG C of preheatings；
(4-2) strip steel through preheating is heated to 770～820 DEG C, and cold rolling pearlite and ferrite occur in the process Recrystallization, when temperature is more than Ac1When begin with austenite produce；
(4-3) strip steel after heating carries out two-phase section annealing in 780～820 DEG C of insulation 60～120s；
(4-4) strip steel after insulation is adopted two-stage cooling：
A. 670～710 DEG C are slowly cooled to；
B. strip steel is cooled to soon 470～500 DEG C；
(4-5) strip steel carries out galvanizing at 450～470 DEG C, and zinc liquid temperature controls at 455～465 DEG C；
(4-6) it is cooled to 200 DEG C or lower with the cooldown rate of 5 DEG C/more than s again after going out zinc pot.
Further, in step (5), zinc-plated rear strip steel is heated to 500～530 DEG C and carries out Alloying Treatment, go out zinc It is cooled to 200 DEG C or lower with the cooldown rate of 5 DEG C/more than s again after pot.
Further, in step (1) using continuous casting strand when come into operation dynamic soft-reduction and electromagnetic stirring system.
Compared with currently available technology, the present invention passes through Design of Chemical Composition with reference to cold rolling, hot rolling, continuous annealing, hot dip Zinc technology controls, and ensure that the steady production of steel plate.The steel being produced, yield strength is 426MPa～540MPa, and tension is strong Spend for >=800MPa, elongation percentage >=15%, have the characteristics that cost economy, equipment is simple, products application performance is good.According to current Market situation, 800MPa level hot dip galvanized dual phase steel product ton steel profit is about 1000 yuan, and current year sells about 2000 tons, accumulative year The new profit is roughly equal to 2,000,000 yuan.
Brief description
Fig. 1 is continuous hot galvanizing process schematic representation (GI：Pure zinc product, GA:Zn-Fe alloying product)
Fig. 2 (a) (b) is product metallographic structure figure
Specific embodiment
Describe the present invention below according to accompanying drawing, it is that one of numerous embodiments of the present invention are preferably real Apply example.
In a preferred embodiment, a kind of 800MPa level economical hot dip galvanized dual phase steel steel plate containing Si, its chemistry becomes Point mass percent is：C：0.08～0.12%；Si：0.10～0.18%；Mn：1.5～2.5%；Cr：0.2～0.4%；Mo： 0.12～0.20%；Als：0.03-0.06%, P≤0.015%, S≤0.04%, N：≤ 0.005%, balance of Fe and can not The impurity avoiding.
The preparation method of the present invention, comprises the following steps successively：
(1) smelt and solidification：It is applied to converter, electric furnace and induction furnace to smelt；Using continuous casting strand, for ensureing strand Quality can come into operation dynamic soft-reduction and electromagnetic stirring system；
(2) hot continuous rolling of strand or ingot casting：Strand is heated through 1200～1250 DEG C, 5-7 passage is carried out by roughing mill and rolls System, hot rolling to 20-40mm thickness specification, 5-7 passes are carried out by hot tandem, is rolled to after target thickness in 620-670 Carry out in the range of DEG C coiling into coil of strip；
(3) pickling and cold-rolling：By hot-strip through hydrochloric acid trough pickling, after removing scale on surface, carry out cold continuous rolling or cold Roll, cold rolling reduction ratio >=50%, be rolled to target thickness.
(4) continuous annealing is zinc-plated：Cold-strip steel is heated slowly to 180 DEG C of preheatings first, further through the strip steel of preheating It is heated to (770～820) DEG C, cold rolling pearlite and ferrite recrystallize in the process, when temperature is more than Ac1When start Austenite is had to produce.Strip steel after heating carries out two-phase section annealing in (780～820) DEG C insulation (60～120) s.After being incubated Strip steel adopt two-stage cooling：Slowly cool to (670～710) DEG C first, then strip steel is cooled to (470～500) DEG C soon. Strip steel carries out galvanizing in (450～470) DEG C, and usual zinc liquid temperature controls in (455～465) DEG C；Go out after zinc pot again with 5 DEG C/s Above cooldown rate is cooled to 200 DEG C or lower.
(5) alloying：Zinc-plated rear strip steel is heated to (500～530) DEG C and carries out Alloying Treatment, go out after zinc pot again with The cooldown rate of 5 DEG C/more than s is cooled to 200 DEG C or lower.
In a further advantageous embodiment, a kind of 800MPa level economical hot dip galvanized dual phase steel steel plate containing Si, its chemistry Composition quality percent is：C：0.08～0.12%；Si：0.10～0.18%；Mn：1.5～2.5%；Cr：0.2～0.4%； Mo：0.12～0.20%；Als：0.03-0.06%, P≤0.015%, S≤0.04%, N：≤ 0.005%, balance of Fe and not Evitable impurity.
Preparation method comprises the following steps successively：
(1) smelt and solidification：It is applied to converter, electric furnace and induction furnace to smelt；Using continuous casting strand, for ensureing strand Quality can come into operation dynamic soft-reduction and electromagnetic stirring system；
(2) hot continuous rolling of strand or ingot casting：Strand is heated through 1200～1250 DEG C, 5-7 passage is carried out by roughing mill and rolls System, hot rolling to 20-40mm thickness specification, 5-7 passes are carried out by hot tandem, is rolled to after target thickness in 620-670 Carry out in the range of DEG C coiling into coil of strip；
(3) pickling and cold-rolling：By hot-strip through hydrochloric acid trough pickling, after removing scale on surface, carry out cold continuous rolling or cold Roll, cold rolling reduction ratio >=50%, be rolled to target thickness.
(4) continuous annealing is zinc-plated：Cold-strip steel is heated slowly to 180 DEG C of preheatings first, further through the strip steel of preheating It is heated to (770～820) DEG C, cold rolling pearlite and ferrite recrystallize in the process, when temperature is more than Ac1When start Austenite is had to produce.Strip steel after heating carries out two-phase section annealing in (780～820) DEG C insulation (60～120) s.After being incubated Strip steel adopt two-stage cooling：Slowly cool to (670～710) DEG C first, then strip steel is cooled to (470～490) DEG C soon. Strip steel carries out galvanizing in (450～470) DEG C, and usual zinc liquid temperature controls in (455～465) DEG C；Go out after zinc pot again with 5 DEG C/s Above cooldown rate is cooled to 200 DEG C or lower.
(5) alloying：Zinc-plated rear strip steel is heated to (500～530) DEG C and carries out Alloying Treatment, go out after zinc pot again with The cooldown rate of 5 DEG C/more than s is cooled to 200 DEG C or lower.
C：One of maximally effective intensified element, the formation for martensite plays a crucial role, and in steel, carbon content determines two-phase The intensity rank of steel and the performance of martensite；Due to the design requirement of martensite content and quenching degree, the two-phase of this rank intensity Steel C content is typically between 0.06～0.18%.In the present invention, the Composition Control of C is in the relatively low scope of (0.08～0.12) %.
Si：Ferrite former, plays the effect of solution strengthening, in two-phase section insulation and slow cooling, can effectively facilitate C To the bulk diffusion effect of Ovshinsky, there is significant purification to ferrite, improve ferrite degree of purity in dual phase steel, stable Austria Family name's body is organized；On the other hand, Si content exceedes and easily forms refractory oxide in surface of steel plate during certain limit, thus affecting into Product Coating effect, will rationally control the addition of Si, so Si weight percentage of the present invention controls in Si：(0.1～ 0.18) %.
Mn：Improve the stability of austenite, thus dramatically increasing quenching degree, Mn also functions to solution strengthening and refinement ferrum element The effect of body crystal grain.On the other hand, Mn is to expand γ p-block element p, when high manganese content makes the perlitic transformation time started postpone Meanwhile, ferritic precipitation can also be slowed down；And the too low quenching degree that can not meet of manganese content requires, so Mn weight hundred of the present invention Divide and control in (1.5～2.5) % than content.
Cr：Middle carbide, the quenching degree that can improve steel the same with Mn element, with the collocation of other alloying elements Add in steel, the quenching degree of steel can be greatly improved, thus postponing perlitic transformation and bainite transformation, and expand and batch window Mouthful, Cr is also a kind of solution strengthening element, plays the invigoration effect to matrix.On the other hand, too high Cr content, can make steel Quenching degree greatly improves, so that intensity greatly increases, is degrading formability and the weldability of steel.Therefore preferably Cr content should Control within (0.2～0.4) %.
Als：Effect played in dual phase steel for the Al is similar to Si, and Al also can form AlN and separate out simultaneously, plays certain thin Change the effect of crystal grain.The presence of a small amount of Al is it is ensured that on the premise of strength character, can make the extension property of dual phase steel improve.So Al weight percent content of the present invention controls in (0.03-0.06) %.
P、S、N：For reducing the harmful effect of the punching performance to steel for the objectionable impurities in steel, strict P, S, N controlling in steel Content.
The main feature of the present invention：In patent of the present invention, composition design rationally, does not add noble metal alloy in a large number, less C content and a small amount of alloying element it is ensured that good welding performance, and composition can meet large-scale production control.Pass through The control (control of LF+RH duplex and dynamic soft-reduction and electromagnetic agitation) in steel area ensure that the essence of slab quality and alloying element Really hit.Hot-rolled area, by the way of high temperature rolling low temperature batches, quick cools down, it is to avoid the product of hot-rolled area banded structure Raw.The interpolation of the elements such as Si, Cr, Mo can ensure that the stability of austenite and avoids the excessive life of bainite after subsequently plating Become, thus ensure that typical ferrite and martensite duplex structure it is ensured that the ductility of dual phase steel and low yield tensile ratio.Close simultaneously Reason adds silicon addition, the easily Surface Segregation element such as Mn, Cr it is ensured that while having good combination property, also ensureing zinc-plated Finished product has preferable surface quality.
The present invention compared with prior art, the 800MPa level hot dip galvanized dual phase steel that produced, yield strength be 420MPa～ 550MPa, tensile strength is >=780MPa, pure zinc elongation percentage >=14% (zinc-iron alloy elongation percentage >=12%), surface quality grades Reach FB surface.Have the characteristics that cost economy, equipment is simple, product good combination property.
Below in conjunction with the accompanying drawings the feature of the present invention is further described：The chemical composition of steel is as shown in table 2.Its preparation Technique is：
(1) smelt and solidification：It is applied to converter, electric furnace and induction furnace to smelt；Using continuous casting strand, for ensureing strand Quality can come into operation dynamic soft-reduction and electromagnetic stirring system；
(2) hot continuous rolling of strand or ingot casting：By strand through (1200-1250) DEG C heating, 5～7 passages are carried out by roughing mill Rolling, hot rolling to 30mm～50mm thickness specification, 5～7 passes are carried out by hot tandem, be rolled to after target thickness (620-670) carry out coiling into coil of strip in the range of DEG C；
(3) pickling and cold-rolling：By hot-strip through hydrochloric acid trough pickling, after removing scale on surface, carry out cold continuous rolling or cold Roll, cold rolling reduction ratio is >=50%, is rolled to target thickness.
(4) continuous annealing galvanizing：Sample after acid is rolled, continuous annealing and zincincation and corresponding properties of product are such as Shown in table 2.
Table 2 embodiment
Above in conjunction with accompanying drawing, the present invention is exemplarily described it is clear that the present invention implements is not subject to aforesaid way Restriction, as long as employing method of the present invention design and the various improvement that carry out of technical scheme, or not improved direct application In other occasions, all within protection scope of the present invention.

Claims (9)

1. a kind of tensile strength 800MPa level contains the cold-rolled galvanized duplex steel of Si it is characterised in that its chemical composition quality hundred Fraction is：C：0.08～0.12%, Si：0.10～0.18%, Mn：1.5～2.5%, Cr：0.2～0.4%, Mo：0.12～ 0.20%, Als：0.03-0.06%, P≤0.015%, S≤0.04%, N：≤ 0.005%, balance of Fe and inevitably Impurity.
2. tensile strength 800MPa level as claimed in claim 1 contains the production method of the cold-rolled galvanized duplex steel of Si, and it is special Levy and be, comprise the steps：
(1) smelt and solidification；
(2) hot continuous rolling of strand or ingot casting；
(3) pickling and cold-rolling；
(4) continuous annealing is zinc-plated.
3. tensile strength 800MPa level as claimed in claim 2 contains the production method of the cold-rolled galvanized duplex steel of Si, and it is special Levy and be, further include step (5)：Alloying.
4. the tensile strength 800MPa level as described in claim 2 and 3 contains the production method of the cold-rolled galvanized duplex steel of Si,
It is characterized in that, adopt converter, electric furnace and induction furnace to smelt in step (1), and adopt continuous casting strand.
5. the tensile strength 800MPa level as described in claim 2-4 contains the production method of the cold-rolled galvanized duplex steel of Si, its It is characterised by, in step (2), strand is heated through 1200～1250 DEG C, 5-7 passes are carried out by roughing mill,
Hot rolling, to 20-40mm thickness specification, carries out 5-7 passes by hot tandem, is rolled to after target thickness in 620-670 Carry out in the range of DEG C coiling into coil of strip.
6. the tensile strength 800MPa level as described in claim 2-5 contains the production method of the cold-rolled galvanized duplex steel of Si, its It is characterised by, in step (3), by hot-strip through hydrochloric acid trough pickling, after removing scale on surface, carry out cold continuous rolling or cold Roll, cold rolling reduction ratio >=50%, be rolled to target thickness.
7. the tensile strength 800MPa level as described in claim 2-6 contains the production method of the cold-rolled galvanized duplex steel of Si, its It is characterised by, step comprises the steps in (4)：
(4-1) cold-strip steel is heated slowly to 180 DEG C of preheatings；
(4-2) strip steel through preheating is heated to 770～820 DEG C, and cold rolling pearlite and ferrite occur to tie again in the process Crystalline substance, when temperature is more than Ac1When begin with austenite produce；
(4-3) strip steel after heating carries out two-phase section annealing in 780～820 DEG C of insulation 60～120s；
(4-4) strip steel after insulation is adopted two-stage cooling：
A. 670～710 DEG C are slowly cooled to；
B. strip steel is cooled to soon 470～500 DEG C；
(4-5) strip steel carries out galvanizing at 450～470 DEG C, and zinc liquid temperature controls at 455～465 DEG C；
(4-6) it is cooled to 200 DEG C or lower with the cooldown rate of 5 DEG C/more than s again after going out zinc pot.
8. the tensile strength 800MPa level as described in claim 3-7 contains the production method of the cold-rolled galvanized duplex steel of Si, its It is characterised by, in step (5), zinc-plated rear strip steel is heated to 500～530 DEG C and carries out Alloying Treatment, go out after zinc pot again with 5 DEG C/cooldown rate of more than s is cooled to 200 DEG C or lower.
9. tensile strength 800MPa level as claimed in claim 4 contains the production method of the cold-rolled galvanized duplex steel of Si, and it is special Levy and be, come into operation when in step (1) using continuous casting strand dynamic soft-reduction and electromagnetic stirring system.
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