CN108570602A - A kind of zinc-plated building floor steel of high intensity and its manufacturing method - Google Patents
A kind of zinc-plated building floor steel of high intensity and its manufacturing method Download PDFInfo
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- CN108570602A CN108570602A CN201810498552.8A CN201810498552A CN108570602A CN 108570602 A CN108570602 A CN 108570602A CN 201810498552 A CN201810498552 A CN 201810498552A CN 108570602 A CN108570602 A CN 108570602A
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- 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
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of zinc-plated building floor steel of high intensity, chemical composition includes：In terms of wt%, C：0.005~0.015, Si：≤0.02、Mn：0.10~0.20, P：≤0.015、S：≤0.012、solAl：0.02~0.06, N：≤0.005、Ti：<0.005、Nb：<0.005, remaining is Fe and inevitable impurity, and first through desulfurizing iron, converter smelting, the molten steel of smelting is carried out Argon；Then molten steel is carried out being continuously cast into continuous casting billet；Continuous casting billet, at steel band, pickling is carried out with coupled pickling and tandem mill through hot continuous rolling to hot rolled strip；The cold rolling for then carrying out 5 passages obtains strip, after hot-dip aluminizing zinc, finishing, straightening, precoated shet, produces high-strength structure galvanized sheet.The structure galvanized sheet of the present invention, has the advantages that coating adhesion is excellent, corrosion-resistant good, is conducive to improve service life, strongly reduces the production cost of high-strength structure galvanized sheet of the present invention.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, and in particular to a kind of zinc-plated building floor steel of high intensity and its manufacture
Method.
Background technology
China's structural level galvanized sheet is mainly used in building field, it is desirable that has high intensity, good toughness and excellent
Corrosion resistance.Domestic many users (especially construction industry user) Structure of need galvanized sheet to improve the intensity of structural member, subtracts
Light weight reduces cost.
Document resource both domestic and external is retrieved by metallurgical industry information standard research institute, is found altogether and this research item
Mesh pertinent literature 18.A kind of hot-dip coating aluminium-zinc alloy steel plate and its production method (number of patent application of the prosperous equal inventions of Zheng：
CN200810180707.X), which includes substrate of steel plate and the alumin(i)um zinc alloy positioned at substrate of steel plate surface
Coating, on the basis of the total amount of substrate of steel plate, which contains (weight percent) and is more than 0.03%-0.1%C, 0.15-
0.35%Mn, 0.001-0.02%Ti, 0.005-0.03%Nb, 0.01-0.065%Als, 99.44-99.8%Fe, Si≤
0.03%, P≤0.025%, S≤0.015%, N≤0.005%.The weight of the al-zn alloy coating is 70-100g/m2.Institute
The content for stating aluminium in al-zn alloy coating can be 50~65wt%, and the content of zinc is 35-50wt%.The present invention thickness be
1.5 millimeters of hot-dip coating aluminium-zinc alloy steel plate yield strength (ReL) is up to 420MPa, tensile strength (Rm) is up to 460MPa.The steel
Plate has tensile strength of the 380MPa less than 540MPa, but the hot-dip high-strength steel sheet of the patent disclosure, steel are added
The alloys such as Ti, Nb, production cost is high, therefore, makees precoated substrate market competition force difference with this kind of high strength galvanized steel plate, it is difficult to push away
Wide application.B En Geer, KD grace suddenly, a kind of manufacture cold-strip of KD Shi meter Te inventions or the method for plank are (specially
Sharp application number：CN99810709.3) be related to by C, Al, Ti, V, Nb respectively be up to 0.2% and Si, Mn respectively be up to 1%,
With the desired amount of boron of fixed nitrogen (0.78 × N of ＞), remaining group manufactures cold-rolled strip as the low-alloy steel of iron and inevitable impurity
The method of material or plank, cold-strip to tie again completely in 520~780 DEG C of lower annealing temperature sufficiently long a period of times
It is brilliant.But the patent is a kind of completion recrystallization cold-rolled steel sheet, and the mechanical property of steel plate is also not directed to.
Therefore, domestic and international researcher has been devoted to develop a kind of while having low cost, high intensity, corrosion resistance
Excellent structure galvanized sheet.
Invention content
To overcome the deficiency, the purpose of the present invention is to provide a kind of zinc-plated building floor steel of high intensity and its manufactures
Method, production cost is low, intensity is high, and has excellent corrosion resistance.
The technical solution adopted by the present invention to solve the technical problems is：A kind of zinc-plated building floor steel of high intensity,
Chemical composition includes：In terms of wt%, C：0.005~0.015, Si：≤0.02、Mn：0.10~0.20, P：≤0.015、S：≤
0.012、solAl：0.02~0.06, N：≤0.005、Ti：<0.005、Nb：<0.005, remaining for Fe and inevitably it is miscellaneous
Matter.
The C content of the present invention is selected 0.005~0.015%, since cementite is relative to carbon steel (matrix is ferrite)
It is cathode, therefore, when carbon content increases, increases cathode quantity and area, correspondingly its corrosion current increases, thus leads
Cause the reduction of its corrosion resistance.It is well known that carbon is most effective solution strengthening element, therefore, with the increase carbon steel of carbon content
It is gradually hardened, while (punching press, drawing) is cold worked for it and welding performance degenerates.In addition, carbon content has significantly galvanizing in steel
Influence, phosphorus content is higher, and the reaction of iron-zinc is just stronger, and the loss of iron is bigger, and iron-zinc alloy layer becomes thicker, keeps zinc coat viscous
Attached property degenerates.Amid all these factors, under the premise of ensureing high-strength roller coated plate mechanical property, C content need to be carried out strictly
Control, carbon content are 0.005~0.015%.
Si content≤0.02% of the present invention, silicon is a kind of stronger solution strengthening element, and a certain amount of silicon, which is added, to be carried
The intensity of Gao Gang, but higher silicon content has an adverse effect to meeting galvanizing in base steel.As the silicone content in base steel increases,
Then silicon is increased therewith by the SiO2 contents that oxidation generates, this will influence the effect of subsequent pickling process, if steel after pickling
Plate surface still has the SiO2 of remaining, then iron-zinc alloy layer ζ phases acutely thicken in zinc-plated rear coating, form grey coating, and make plating
Layer adhesiveness degenerates.Therefore, it is necessary to by silicone content control in suitable range, therefore, Si contents are≤0.02%.
The Mn contents 0.10~0.20% of the present invention.Mn energy reinforced ferrites, in addition, manganese is added in steel can prevent from adding in heat
Working hour causes the embrittlement of steel because of sulphur, but as the content of galvanized sheet Mn is higher, processing performance will be gradually reduced, and therefore, Mn contains
Amount is 0.10~0.20%.
P content≤0.015% of the present invention, for the galvanized sheet for requiring good corrosion resistance, phosphorus
Content it is preferably as low as possible because phosphorus is easy to happen segregation, cause the embrittlement of steel, deteriorated weldability etc., therefore, P content≤
0.015%.
S content≤0.012% of the present invention, in general, S is objectionable impurities elements in steel, and the content of S is smaller resistance to
Corrosion is better, therefore, S content≤0.012%.
N content≤0.005%, N of the present invention is as C and solid solution element.With the increase of N content in steel, will lead
Its pressworkability is caused to degenerate (such as n, r value decline), meanwhile, solid solution N is spy the main reason for causing zinc-plated board finished product timeliness
It is not for the strain-aging effect after smooth, the influence of nitrogen is especially big, therefore it is required that N is low as possible.To high-strength structure roller
For coated plate, the N content in steel answers≤0.005%.
The solAl contents of the present invention are 0.02~0.06%, in steel the addition of Al can then be formed dissolved aluminum (Als) and it is sour not
Molten aluminium, and Als includes being dissolved aluminium and AlN, the AlN particles of disperse to prevent growing up for austenite grain, crystal grain thinning, but for
For carbon aluminium-killed steel, with the increase of Als, the amount of inclusions of steel increases, and inclusion size will also become larger, and will cause to plate
Coating adhesion, corrosion resisting property and the pressworkability of zine plate are deteriorated.But in order to ensure that N is fully combined generation with Al in steel
AlN reduces the timeliness and the surface quality of the complete deoxidation of molten steel and continuous casting billet of roller coating board finished product, and Als should ensure that >=
0.02%.Therefore, the selection of solAl contents is 0.02~0.06%.
In addition to containing above-mentioned chemical composition, surplus is Fe and is inevitably mingled with the present invention.
A kind of manufacturing method of the zinc-plated building floor steel of high intensity, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet, at steel band, pickling are carried out with coupled pickling and tandem mill through hot continuous rolling to hot rolled strip；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 60~275g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 620~670 DEG C, and 20~60s of continuous annealing time, metallographic structure is iron
Ferritic+Zona transformans is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 460~465 DEG C, and strip enters zinc pot temperature
460~470 DEG C.
Components described above and manufacturing method production gained galvanized sheet, yield strength RP0.2 (or ReH) be 410~
550MPa；Tensile strength Rm is 520~600MPa；Elongation after fracture A80mm >=10%.
The invention has the advantages that：The structure galvanized sheet of the present invention has coating adhesion excellent, corrosion-resistant
Good advantage is conducive to improve service life, reduces user cost；The high-strength structure of the present invention is in galvanized sheet chemical composition
The alloys such as Ti, Nb are not added, the Mn alloy amounts of addition are also less, to ensure that the intensity of galvanized sheet of the present invention mainly uses galvanizing
Technique adjustment (such as reduces galvanizing annealing temperature, improves continuous galvanizing line speed), to strongly reduce height of the invention
The production cost of strength structure galvanized sheet；The production cost of the high-strength structure galvanized sheet of the present invention is high with general same level
Strength structure compares cost reduction 10~15% with galvanized sheet, improves the market competition of high-strength structure galvanized sheet of the present invention
Power；The structure of present invention galvanized sheet has the advantages that intensity is high, pressworkability is good, excellent corrosion resistance, is suitable for height
Strength structure corrosion resistance construction material, such as it is processed into the industries such as roof boarding, side panel, truck body, traffic.
Description of the drawings
Fig. 1 is the process flow chart of the present invention.
Fig. 2 is the metallograph of the also imperfect galvanized sheet of recrystallization of the present invention.
Specific implementation mode
In conjunction with the accompanying drawings, the present invention is further explained in detail.
Embodiment 1：
A kind of chemical composition (wt%) of the zinc-plated building floor steel of high intensity is C：0.009、Si：0.013、Mn：0.15、
P：0.015、S：0.011、solAl：0.05、N：0.0021、Ti：0.002、Nb：0.001, remaining for Fe and inevitably it is miscellaneous
Matter.
Its manufacturing method, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to RH application of vacuum；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 150g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 670 DEG C, continuous annealing time 60s, and metallographic structure is ferrite+deformation
Band is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 460 DEG C, and strip enters 460 DEG C of zinc pot temperature.
The galvanized sheet of components described above and manufacturing method production gained, yield strength RP0.2For 461MPa；Tensile strength
RmFor 552MPa；Elongation after fracture A80Mm is 16%.
Embodiment 2：
A kind of chemical composition (wt%) of the zinc-plated building floor steel of high intensity is C：0.01、Si：0.011、Mn：0.19、
P：0.015、S：0.016、solAl：0.06、N：0.0015、Ti：0.003、Nb：0.002, remaining for Fe and inevitably it is miscellaneous
Matter.
Its manufacturing method, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 120g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 650 DEG C, continuous annealing time 50s, and metallographic structure is ferrite+deformation
Band is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 462 DEG C, and strip enters 465 DEG C of zinc pot temperature.
The galvanized sheet of components described above and manufacturing method production gained, yield strength RP0.2For 474MPa；Tensile strength
RmFor 571MPa；Elongation after fracture A80Mm is 16%.
Embodiment 3：
A kind of chemical composition (wt%) of the zinc-plated building floor steel of high intensity is C：0.011、Si：0.018、Mn：0.18、
P：0.010、S：0.009、solAl：0.02、N：0.0025、Ti：0.001、Nb：0.001, remaining for Fe and inevitably it is miscellaneous
Matter.
Its manufacturing method, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 60g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 650 DEG C, continuous annealing time 20s, and metallographic structure is ferrite+deformation
Band is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 465 DEG C, and strip enters 470 DEG C of zinc pot temperature.
The galvanized sheet of components described above and manufacturing method production gained, yield strength RP0.2For 469MPa；Tensile strength
RmFor 577MPa；Elongation after fracture A80Mm is 15%.
Embodiment 4：
A kind of chemical composition (wt%) of the zinc-plated building floor steel of high intensity is C：0.008、Si：0.015、Mn：0.14、
P：0.009、S：0.010、solAl：0.03、N：0.0028、Ti：0.003、Nb：0.002, remaining for Fe and inevitably it is miscellaneous
Matter.
Its manufacturing method, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 80g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 630 DEG C, continuous annealing time 40s, and metallographic structure is ferrite+deformation
Band is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 461 DEG C, and strip enters 467 DEG C of zinc pot temperature.
The galvanized sheet of components described above and manufacturing method production gained, yield strength RP0.2For 457MPa；Tensile strength
RmFor 560MPa；Elongation after fracture A80Mm is 15%.
Embodiment 5：
A kind of chemical composition (wt%) of the zinc-plated building floor steel of high intensity is C：0.012、Si：0.015、Mn：0.16、
P：0.018、S：0.008、solAl：0.04、N：0.0015、Ti：0.001、Nb：0.001, remaining for Fe and inevitably it is miscellaneous
Matter.
Its manufacturing method, includes the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot dip
After zinc, finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
Specifically, zinc-plated plate thickness obtained is 0.6~1.5mm in the step D4.
Specifically, the two-sided coating weight of the galvanized sheet galvanizing is 275g/m2。
Specifically, in the hot galvanizing process, the content of aluminium is 0.22wt% in zinc liquid.
Specifically, the continuous annealing temperature is 620 DEG C, continuous annealing time 35s, and metallographic structure is ferrite+deformation
Band is brilliant.
Specifically, in the step D4 in hot galvanizing process, zinc liquid temperature is 462 DEG C, and strip enters 468 DEG C of zinc pot temperature.
The galvanized sheet of components described above and manufacturing method production gained, yield strength RP0.2 are 481MPa；Tensile strength
Rm is 575MPa；Elongation after fracture A80mm is 13%.
The present invention is not limited to the embodiment, anyone should learn that the structure made under the inspiration of the present invention becomes
Change, the technical schemes that are same or similar to the present invention are each fallen within protection scope of the present invention.
Technology that the present invention is not described in detail, shape, construction part are known technology.
Claims (7)
1. a kind of zinc-plated building floor steel of high intensity, it is characterised in that：Its chemical composition (wt%) includes C：0.005~
0.015、Si：≤0.02、Mn：0.10~0.20, P：≤0.015、S：≤0.012、solAl：0.02~0.06, N：≤0.005、
Ti：<0.005、Nb：<0.005, remaining is Fe and inevitable impurity.
2. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：Include the following steps：
D1, first through desulfurizing iron, converter smelting, the molten steel of smelting is subjected to Argon；
D2 and then molten steel is carried out to be continuously cast into continuous casting billet；
D3, continuous casting billet, at steel band, pickling are carried out with coupled pickling and tandem mill through hot continuous rolling to hot rolled strip；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 55~65% ranges, through hot-dip aluminizing zinc,
After finishing, straightening, precoated shet, high-strength structure galvanized sheet is produced.
3. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：It is obtained zinc-plated in the step D4
Plate thickness is 0.6~1.5mm.
4. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：The galvanized sheet galvanizing it is two-sided
Coating weight is 60~275g/m2。
5. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：In the hot galvanizing process, in zinc liquid
The content of aluminium is 0.22wt%.
6. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：The continuous annealing temperature be 620~
670 DEG C, 20~60s of continuous annealing time, metallographic structure is that ferrite+Zona transformans is brilliant.
7. a kind of manufacturing method of the zinc-plated building floor steel of high intensity, it is characterised in that：Hot galvanizing process in the step D4
In, zinc liquid temperature is 460~465 DEG C, and strip enters 460~470 DEG C of zinc pot temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109797347A (en) * | 2019-02-28 | 2019-05-24 | 日照钢铁控股集团有限公司 | A kind of 400MPa grades of floor support plate industry hot radical is without spangle high-strength galvanizing plate and its production method |
| CN110004369A (en) * | 2019-04-30 | 2019-07-12 | 马鞍山钢铁股份有限公司 | A kind of elevator think gauge galvanized steel plain sheet and its manufacturing method |
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| CN102363857A (en) * | 2011-11-02 | 2012-02-29 | 武汉钢铁(集团)公司 | Method for producing color-coated plate for structure with yield strength of more than or equal to 550 MPa |
| CN102732780A (en) * | 2012-06-18 | 2012-10-17 | 首钢总公司 | Hot galvanized plate used for refrigerator outer plate, and production method thereof |
| CN104480369A (en) * | 2014-12-09 | 2015-04-01 | 武汉钢铁(集团)公司 | Electro-galvanized sheet for liquid crystal module and preparation method of electro-galvanized sheet |
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| CN102363857A (en) * | 2011-11-02 | 2012-02-29 | 武汉钢铁(集团)公司 | Method for producing color-coated plate for structure with yield strength of more than or equal to 550 MPa |
| CN102732780A (en) * | 2012-06-18 | 2012-10-17 | 首钢总公司 | Hot galvanized plate used for refrigerator outer plate, and production method thereof |
| CN104480369A (en) * | 2014-12-09 | 2015-04-01 | 武汉钢铁(集团)公司 | Electro-galvanized sheet for liquid crystal module and preparation method of electro-galvanized sheet |
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| CN109797347A (en) * | 2019-02-28 | 2019-05-24 | 日照钢铁控股集团有限公司 | A kind of 400MPa grades of floor support plate industry hot radical is without spangle high-strength galvanizing plate and its production method |
| CN110004369A (en) * | 2019-04-30 | 2019-07-12 | 马鞍山钢铁股份有限公司 | A kind of elevator think gauge galvanized steel plain sheet and its manufacturing method |
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