CN108396253A - A kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent and its production method - Google Patents

A kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent and its production method Download PDF

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Publication number
CN108396253A
CN108396253A CN201810023502.4A CN201810023502A CN108396253A CN 108396253 A CN108396253 A CN 108396253A CN 201810023502 A CN201810023502 A CN 201810023502A CN 108396253 A CN108396253 A CN 108396253A
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China
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zinc
temperature
intensity
strip steel
steel
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Inventor
刘靖宝
杜明山
李岩
李永志
汪云辉
郭志凯
刘丽萍
李梦龙
路博勋
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Priority to CN201810023502.4A priority Critical patent/CN108396253A/en
Publication of CN108396253A publication Critical patent/CN108396253A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32Ferrous alloys, e.g. steel alloys containing chromium with boron
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06Zinc or cadmium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34Hot-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
    • C23C2/36Elongated material
    • C23C2/40Plates; Strips

Abstract

The invention discloses a kind of zinc-plated diphasic strip steel of high intensity that buckling performance is excellent and its production method, the band steel chemical composition composition and its mass percentage are:C:0.07~0.10%, Mn:2.10~2.40%, S≤0.012%, P≤0.020%, Si≤0.12%, Als:0.50~0.80%, Mo:0.10~0.30%, Cr:0.20~0.40%, B:0.0010~0.0025%, Ti:0.010~0.025%, Nb:0.010~0.030%, N≤0.0030%, remaining is iron and inevitable impurity;The production method includes molten iron pretreatment, pneumatic steelmaking, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process.The martensite and ferrite that are organized as being evenly distributed of the zinc-plated diphasic strip steel of high intensity of the present invention, product have excellent bending, welding and forming property.

Description

A kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent and its production method
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent and Its production method.
Background technology
With the raising that vehicle safety performance requires, joint brand automobile, which mostly uses zincincation production, has good strong modeling Long-pending advanced high-strength steel.Intensity is high first, collision energy-absorbing is high, can ensure that automobile has enough security performances, mitigate simultaneously Car body weight;Secondly automobile gasoline is significantly reduced to consume and reduce CO2The discharge of gas;Therefore, zinc coated high strength steel is in Automobile Use in body manufacture is more and more, especially on some safety members and structural member.Most of safety member and structural member at Flange, bending and flattening process are needed during type, and to the mouldability of material, more stringent requirements are proposed, this just needs exploitation one Kind not only there is high intensity, but also the steel with good formability, dual phase steel is a selection, such steel grade by ferrite with Martensite form, have the characteristics that low yield strength ratio, high work hardening rate, good intensity and extensibility cooperation, at present depth by The favor of major auto vendor.
Invention content
The technical problem to be solved in the present invention is to provide a kind of zinc-plated diphasic strip steels of the high intensity that buckling performance is excellent;This hair It is bright that a kind of production method of the zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent is also provided;Product has good bending Energy.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:A kind of high intensity that buckling performance is excellent plating Zinc diphasic strip steel, the band steel chemical composition composition and its mass percentage are:C:0.07~0.10%, Mn:2.10~ 2.40%, S≤0.012%, P≤0.020%, Si≤0.12%, Als:0.50~0.80%, Mo:0.10~0.30%, Cr:0.20~ 0.40%, B:0.0010~0.0025%, Ti:0.010~0.025%, Nb:0.010~0.030%, N≤0.0030%, remaining is iron With inevitable impurity.
Design of Chemical Composition thinking of the present invention is as follows:
C:Most basic element in steel, the intensity to improving steel plays very important effect, to the yield strength and tension of steel Intensity effect is maximum.Under normal conditions, the intensity of steel is higher, and elongation percentage is lower, in order on the basis of high intensity, have simultaneously Good welding performance, therefore carbon content control is 0.07~0.10%.
Mn:It is austenite stabilizer element, can effectively improve the quenching degree of austenite, thus after reduction two-phase section heating Cooling rate necessary to duplex structure is obtained in cooling procedure.Mn can also reduce the solid solution C in ferrite, promote C to Austria It is shifted in family name's body, ferrite matrix is purified while improving austenite quenching degree, to improve the ductility of dual phase steel, therefore, Mn Play an important roll to the formation of two-phase steel organization.Mn contents are controlled 2.10~2.40%.
Si:It is ferrite former, is easy to dissolve to ferrite, and C, Mn can be effectively improved in ferrite Chemical potential, in two-phase section annealing process, the addition of Si substantially speeds up the transfer of C, Mn into austenite, difficult to understand to increase indirectly The stability of family name's body.Si makes ferrite fully " purification ", avoids a large amount of gaps solid solutions of the C in ferrite.Si content height exists The iron scale of olivine-type can be formed when hot rolling on surface, it is difficult to be removed, be unfavorable for surface quality, also hold in galvanizing process It is also easy to produce surface enrichment, causes plating leakage defect, and it is too low, the effect of ferrite row's carbon is not had, Si elements are got in the present invention It is few better, therefore the control of Si contents is ≤0.12%.
Al:The influence of Austenite Morphology is similar to silicon when aluminium heats critical zone, and aluminium can also form AlN precipitations, play Certain Grain refinement.Effect of the aluminium played in dual phase steel is similar with silicon effect.Aluminium is the strong element for reducing γ circles, It improves Ac1And Ar1Point, and make Ar3Slightly reduce.Aluminium also significantly improves MsPoint and the reduction quenched remained austenite content of steel. Due to being not suitable for that excessive silicon is added in dual phase steel, and the effect of aluminium is similar to silicon, it may be considered that silicon member is reduced in dual phase steel Cellulose content, and replace silicon with aluminium.Al content control is in 0.50-0.80% in the present invention.
Nb:Nb plays remarkable effect to C enrichments in crystal grain refinement, transformation behavior, austenite.The Nb delayed heats of solid solution condition Static and dynamic recrystallization and austenite are to ferritic phase transformation in deformation process, to expand recrystallization temperature and Ac3Between Temperature range is provided convenience for the determination of Unhydrated cement final rolling temperature.Nb is combined to form small carbonitride with C and N It can postpone to recrystallize, crystal grain is prevented to grow up, and have apparent reinforcing effect.The carbide of Nb is stablized, it is grown up when critical zone is heated Or dissolving is difficult.Under suitable cooling velocity, dual phase steel containing Nb will appear epitaxy ferrite, and which improve dual phase steels Ductility.Nb contents are 0.010~0.030% in the present invention.
Ti:For carbide, nitride or carbonitride-forming elements, the grain coarsening in 2 Mo Steel Slab during Heating Process is prevented, together When matrix strength improved by precipitation strength.
Mo:Quenching degree being improved, while in the hot rolling, improves recrystallization temperature, thinning microstructure mitigates banded structure, In view of cost, content is controlled 0.10~0.30%.
Belt steel thickness of the present invention is 0.8~2.5mm;When belt steel thickness t≤1.8mm, rolling direction and vertical rolling On direction, bending angle is 180 °, and radius bend is that 0.3t does not crack;When belt steel thickness is 1.8mm < t≤2.5mm, rolling direction In vertical rolling direction, bending angle is 180 °, and radius bend is that 0.5t does not crack;The t is belt steel thickness.
Strip of the present invention is organized as the martensite and ferrite being evenly distributed, ferrite grain size≤12 μm;Horse Family name's body crystallite dimension≤8 μm;420~650MPa of yield strength, tensile strength >=780MPa, elongation after fracture A80≥14%。
The present invention also provides a kind of production method of the zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent, the productions Method includes molten iron pretreatment, pneumatic steelmaking, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing work Sequence;The RH refining procedures adjust the mass percent of aluminium element, by the mass percentage control of aluminium using addition RH aluminum shots System is 0.50~0.80%.
Pneumatic steelmaking process of the present invention, temperature are 1670~1690 DEG C, oxygen position:5~20ppm;Converter terminal controls It is as follows:C:0.015~0.035%, Als:0.50~0.70%, Mo:0.18~0.22%;In tapping process be added mid-carbon fe-mn, Aluminum shot, low-carbon ferrochromium and molybdenum-iron, the control big packet each element content of converter are as follows:C:0.07~0.10%, Mn:2.10~2.40%, Cr:0.20~0.40%, Als:0.50~0.80%, Mo:0.10~0.30%, the big packet temperature of converter is 1620~1640 DEG C.
Continuous casting working procedure of the present invention, the middle packet degree of superheat are 35~45 DEG C, and pulling speed of continuous casting is 1.0~1.2m/min.
Hot-rolled process of the present invention, 1250~1320 DEG C of slab heating temperature, heating time are 160~240min, essence Roll 1030~1070 DEG C of inlet temperature, 870~910 DEG C of finishing temperature, 600~640 DEG C of coiling temperature.
Cold rolling process of the present invention, cold rolling reduction ratio are 55~70%.
Continuous zinc coating process of the present invention, heating 2 and soaking temperature be 780~820 DEG C, soaking time be 50~ 100s, rapid cooling start temperature are 680~710 DEG C, and cooling rate is 45~60 DEG C/s, and it is 458~462 DEG C to enter zinc pot temperature, is gone out It is air-cooled to 150 DEG C using 4 groups of wind turbines after zinc pot.
Finishing process of the present invention, using permanent elongation control pattern, polishing machine elongation percentage is 0.25~0.30%, is rolled Power processed is in 3000~4000KN.
The zinc-plated diphasic strip steel product standard of the excellent high intensity of buckling performance of the present invention refers to GB/T2518-2008.
It is using advantageous effect caused by above-mentioned technical proposal:1, present component design is using addition Al element generations For part Si elements, mitigate Element surface enrichment phenomenon in galvanizing process, makes coating that there is stronger adhesiveness.2, the present invention is logical The variation of alloying element content and the adjustment of technological parameter are crossed, the product of acquisition has excellent bending, welding and forming property. 3, strip of the present invention is organized as the martensite and ferrite being evenly distributed, ferrite grain size≤12 μm;Martensitic crystal grains ruler It is very little≤8 μm.4, strip yield strength of the present invention is in 420-650MPa, tensile strength >=780MPa, elongation after fracture A80≥14%。
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of buckling performance of the present invention includes molten iron pretreatment, converter refining Steel, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm or less;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.015~0.035%, Als:0.50 ~0.70%, Mo:0.18~0.22%;Temperature is 1670~1690 DEG C, oxygen position:5~20ppm, pushing off the slag in tapping process, to ensure Finished product phosphorus content, pushing off the slag mode uses front and back folk art term, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum are added in tapping process Iron, the control big packet each element content of converter are as follows:C:0.07~0.10%, Mn:2.10~2.40%, Cr:0.20~0.40%, Als:0.50~0.80%, Mo:0.10~0.30%, the big packet temperature of converter is 1620~1640 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1630-1665 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1575-1610 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 35~45 DEG C, and pulling speed of continuous casting is 1.0~1.2m/min;
(6)Hot-rolled process:1250~1320 DEG C of slab heating temperature, heating time are 160~240min, finish rolling inlet temperature 1030~1070 DEG C, 870~910 DEG C of finishing temperature, 600~640 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 55~70%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 780~820 DEG C, and soaking time is 50~100s, and rapid cooling starts temperature Degree is 680~710 DEG C, and cooling rate is 45~60 DEG C/s, and it is 458~462 DEG C to enter zinc pot temperature, and 4 groups of wind are used after going out zinc pot Machine is air-cooled to 150 DEG C;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25~0.30%, roll-force 3000~ 4000KN。
Embodiment 1
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.4mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 25ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.60%, Mo: 0.20%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.07%、Mn:2.10%、Cr:0.20%、Als:0.80%、Mo:0.30%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure, the middle packet degree of superheat are 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1270 DEG C, heating time 200min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 60%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 805 DEG C, soaking time 70s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 55 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 12 μm, martensite is 8 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 2
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 0.8mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.015%, Als:0.55%, Mo: 0.18%;Temperature is 1670 DEG C, oxygen position:5ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before and after pushing off the slag mode uses Folk art term, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, the big packet each element content of control converter is such as Under:C:0.10%、Mn:2.40%、Cr:0.40%、Als:0.60%、Mo:0.10%, the big packet temperature of converter is 1620 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1630 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1575 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 35 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1250 DEG C, heating time 240min of slab heating temperature, 1030 DEG C of finish rolling inlet temperature, finish to gauge temperature 870 DEG C of degree, 600 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 70%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 820 DEG C, soaking time 50s, and rapid cooling start temperature is 710 DEG C, Cooling rate is 60 DEG C/s, and it is 462 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.3%, and roll-force is in 3000~4000KN.
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 10 μm, martensite is 7 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 3
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.5mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 20ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.035%, Als:0.50%, Mo: 0.22%;Temperature is 1690 DEG C, oxygen position:20ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.07%、Mn:2.10%、Cr:0.20%、Als:0.50%、Mo:0.22%, the big packet temperature of converter is 1640 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1665 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1610 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 45 DEG C, pulling speed of continuous casting 1.2m/min;
(6)Hot-rolled process:1320 DEG C, heating time 160min of slab heating temperature, 1070 DEG C of finish rolling inlet temperature, finish to gauge temperature 910 DEG C of degree, 640 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 57%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 780 DEG C, soaking time 100s, and rapid cooling start temperature is 680 DEG C, cooling rate is 45 DEG C/s, and it is 458 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.3%, and roll-force is in 3000~4000KN.
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 12 μm, martensite is 7 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 4
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 2.0mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.70%, Mo: 0.19%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.08%、Mn:2.15%、Cr:0.30%、Als:0.70%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 55%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 11 μm, martensite is 6 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.5t does not crack, and wherein t is belt steel thickness.
Embodiment 5
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 2.5mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.025%, Als:0.65%, Mo: 0.20%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.07%、Mn:2.20%、Cr:0.30%、Als:0.65%、Mo:0.20%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 55%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 805 DEG C, soaking time 100s, and rapid cooling start temperature is 700 DEG C, cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 12 μm, martensite is 7 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.5t does not crack, and wherein t is belt steel thickness.
Embodiment 6
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.6mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.70%, Mo: 0.19%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.09%、Mn:2.15%、Cr:0.30%、Als:0.70%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 60%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 10 μm, martensite is 5 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 7
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.8mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.70%, Mo: 0.19%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.08%、Mn:2.15%、Cr:0.30%、Als:0.70%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 60%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 11 μm, martensite is 6 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 8
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.2mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.70%, Mo: 0.19%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.08%、Mn:2.15%、Cr:0.30%、Als:0.70%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 60%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 11 μm, martensite is 6 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 9
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 1.4mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 30ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.020%, Als:0.70%, Mo: 0.19%;Temperature is 1680 DEG C, oxygen position:10ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.08%、Mn:2.15%、Cr:0.30%、Als:0.70%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 40 DEG C, pulling speed of continuous casting 1.0m/min;
(6)Hot-rolled process:1260 DEG C, heating time 190min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 60%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 11 μm, martensite is 6 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.3t does not crack, and wherein t is belt steel thickness.
Embodiment 10
The zinc-plated diphasic strip steel thickness of the present embodiment high intensity is 2.0mm, and chemical composition composition and mass percentage are shown in Table 1.
The production method of the zinc-plated diphasic strip steel of the excellent high intensity of the present embodiment buckling performance includes molten iron pretreatment, converter Steel-making, the refining of LF stoves, RH refinings, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing process, specific process step are as described below:
(1)Hot metal pre process procedures:Using composite blowing particle Mg, S in molten iron is down to 25ppm;
(2)Steel making working procedure:Using 100 tons of top and bottom combined blown converters, converter terminal control is:C:0.030%, Als:0.55%, Mo: 0.19%;Temperature is 1675 DEG C, oxygen position:15ppm, pushing off the slag in tapping process, to ensure finished product phosphorus content, before pushing off the slag mode uses Folk art term afterwards, and mid-carbon fe-mn, aluminum shot, low-carbon ferrochromium and molybdenum-iron are added in tapping process, control the big packet each element content of converter It is as follows:C:0.09%、Mn:2.10%、Cr:0.25%、Als:0.55%、Mo:0.19%, the big packet temperature of converter is 1630 DEG C;
(3)LF refining process:It is adjusted using lime and fluorite slag making, and to C, Cr, Mn, Nb and Als equal size, using electricity Molten steel is heated in pole, and LF out-station temperatures are 1650 DEG C;
(4)RH refining procedures:Mn, Als, B and Ti are finely adjusted, and carry out Ti alloyings, adjustment molten steel composition to target model It encloses, out-station temperature is 1580 DEG C;
(5)Continuous casting working procedure:The middle packet degree of superheat is 45 DEG C, pulling speed of continuous casting 1.1m/min;
(6)Hot-rolled process:1260 DEG C, heating time 200min of slab heating temperature, 1050 DEG C of finish rolling inlet temperature, finish to gauge temperature 890 DEG C of degree, 620 DEG C of coiling temperature;
(7)Cold rolling process:Cold rolling reduction ratio is 55%;
(8)Continuous zinc coating process:Heating 2 and soaking temperature are 810 DEG C, soaking time 80s, and rapid cooling start temperature is 700 DEG C, Cooling rate is 52 DEG C/s, and it is 460 DEG C to enter zinc pot temperature, uses 4 groups of wind turbines air-cooled to 150 DEG C after going out zinc pot;
(9)Finishing process:Using permanent elongation control pattern, polishing machine elongation percentage is 0.25%, roll-force 3000~ 4000KN。
The zinc-plated diphasic strip steel of the present embodiment high intensity is organized as the martensite being evenly distributed and ferrite, and ferrite crystal grain is 12 μm, martensite is 8 μm.
The mechanical property of the zinc-plated diphasic strip steel of the present embodiment high intensity is shown in Table 2;In rolling direction and vertical rolling direction, Bending angle is 180 °, and radius bend is that 0.5t does not crack, and wherein t is belt steel thickness.
The chemical composition of 1 embodiment 1-10 strips of table forms and mass percentage(%)
The mechanical property of 2 embodiment 1-10 strips of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to the present invention into Go detailed description, it will be understood by those of ordinary skill in the art that:It can still modify to the present invention or equally replace It changes, without departing from the spirit or scope of the invention, or any substitutions, the right that should all cover in the present invention is wanted It asks in range.

Claims (10)

1. a kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent, which is characterized in that band steel chemical composition composition and Its mass percentage is:C:0.07~0.10%, Mn:2.10~2.40%, S≤0.012%, P≤0.020%, Si≤0.12%, Als:0.50~0.80%, Mo:0.10~0.30%, Cr:0.20~0.40%, B:0.0010~0.0025%, Ti:0.010~ 0.025%, Nb:0.010~0.030%, N≤0.0030%, remaining is iron and inevitable impurity.
2. a kind of excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 1, which is characterized in that described Belt steel thickness is 0.8~2.5mm;When the belt steel thickness t≤1.8mm, in rolling direction and vertical rolling direction, bending angle is 180 °, radius bend is that 0.3t does not crack;When the belt steel thickness is 1.8mm < t≤2.5mm, rolling direction and vertical rolling On direction, bending angle is 180 °, and radius bend is that 0.5t does not crack;The t is belt steel thickness.
3. a kind of excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 1, which is characterized in that described Strip is organized as the martensite and ferrite being evenly distributed, ferrite grain size≤12 μm;Martensitic crystal grains size≤8 μm; 420~650MPa of yield strength, tensile strength >=780MPa, elongation after fracture A80≥14%。
4. the production based on a kind of excellent zinc-plated diphasic strip steel of high intensity of buckling performance described in claim 1-3 any one Method, which is characterized in that the production method includes molten iron pretreatment, pneumatic steelmaking, the refining of LF stoves, RH refinings, continuous casting, heat Roll, cold rolling, continuous zinc coating and finishing process;The RH refining procedures adjust the quality percentage of aluminium element using addition aluminum shot Than controlling the mass percentage of aluminium 0.50~0.80%.
5. a kind of production method of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4, special Sign is that the pneumatic steelmaking process, temperature is 1670~1690 DEG C, oxygen position:5~20ppm;Converter terminal control is as follows:C: 0.015~0.035%, Als:0.50~0.70%, Mo:0.18~0.22%;Mid-carbon fe-mn, aluminum shot, low is added in tapping process Carbon ferrochrome and molybdenum-iron, the control big packet each element content of converter are as follows:C:0.07~0.10%, Mn:2.10~2.40%, Cr:0.20 ~0.40%, Als:0.50~0.80%, Mo:0.10~0.30%, the big packet temperature of converter is 1620~1640 DEG C.
6. a kind of production method of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4, special Sign is that the continuous casting working procedure, the middle packet degree of superheat is 35~45 DEG C, and pulling speed of continuous casting is 1.0~1.2m/min.
7. a kind of production of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4-6 any one Method, which is characterized in that the hot-rolled process, 1250~1320 DEG C of slab heating temperature, heating time are 160~240min, 1030~1070 DEG C of finish rolling inlet temperature, 870~910 DEG C of finishing temperature, 600~640 DEG C of coiling temperature.
8. a kind of production of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4-6 any one Method, which is characterized in that the cold rolling process, cold rolling reduction ratio are 55~70%.
9. a kind of production of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4-6 any one Method, which is characterized in that the continuous zinc coating process, heating 2 sections and soaking temperature be 780~820 DEG C, soaking time be 50~ 100s, rapid cooling start temperature are 680~710 DEG C, and cooling rate is 45~60 DEG C/s, and it is 458~462 DEG C to enter zinc pot temperature, is gone out It is air-cooled to 150 DEG C using 4 groups of wind turbines after zinc pot.
10. a kind of life of the excellent zinc-plated diphasic strip steel of high intensity of buckling performance according to claim 4-6 any one Production method, which is characterized in that the finishing process, using permanent elongation control pattern, polishing machine elongation percentage is 0.25~ 0.30%, roll-force is in 3000~4000KN.
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CN109881106A (en) * 2019-04-01 2019-06-14 山东钢铁集团日照有限公司 A kind of 780MPa grade hot dip galvanized dual phase steel producing different yield strength ranks and its production method
CN110735024A (en) * 2019-09-27 2020-01-31 张家港扬子江冷轧板有限公司 processing method suitable for bending and rolling hard steel coil at 90 degrees in transverse and longitudinal directions
CN110565023A (en) * 2019-10-18 2019-12-13 山东钢铁集团日照有限公司 Method for producing hot-dip galvanized CP800 steel with different yield strength grades

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