CN107904490A - Structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof - Google Patents
Structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof Download PDFInfo
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- CN107904490A CN107904490A CN201711165758.0A CN201711165758A CN107904490A CN 107904490 A CN107904490 A CN 107904490A CN 201711165758 A CN201711165758 A CN 201711165758A CN 107904490 A CN107904490 A CN 107904490A
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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
- 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
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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
- C21D8/0226—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
- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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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Abstract
The invention belongs to Plate Production field, and in particular to a kind of Thin Specs structure hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof.Hot-dip coating aluminium-zinc alloy steel plate intensity difference for prior art production, the problems such as quality of coating is poor, of high cost, the present invention provides a kind of hot-dip coating aluminium-zinc alloy steel plate, its base material composition is：By weight percentage, C≤0.05%~0.12%, Si≤0.05%, Mn≤0.2%~0.5%, P≤0.04%~0.08%, S≤0.015%, Ti≤0.02~0.04%, Al 0.010~0.080%, surplus are Fe and inevitable impurity；Its preparation method is：Smelt hot rolling cold rolling cleaning annealing hot-dip aluminizing zinc plating postcooling finishing straightening surface treatment oiling and batch finished product.Alloy-steel plate intensity prepared by the present invention is high, and elongation percentage is high, and thickness of coating is thin, zinc is spent uniform, fine and close, and quality is good, and preparation method is simple, and cost is low, easy to promote the use of.
Description
Technical field
The invention belongs to Plate Production field, and in particular to a kind of structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate and its system
Preparation Method.
Background technology
Hot-dip aluminizing zincium steel plate is mainly used for corrosion resistance and requires the less complicated product of high but deformation, especially suitable for household electrical appliances,
Construction industry and conduct precoated substrate are used.According to the growth requirement in market, hot dip aluminum zinc plate is gradually to high strengthening, flash plating, high table
Face Quality Developing.Structure is with the hot dip aluminum zinc plate of more than yield strength 350MPa in household electrical appliances backboard, the outer cover plate of factory building
It is used widely Deng field.Produce mechanical property and the excellent product of coating surface quality, substrate component and prepare work
Skill is all most important.The production method that patent proposes hot-dip coating aluminium-zinc alloy steel plate is given in the prior art.Such as：
Patent CN 101736195A provide a kind of hot-dip coating aluminium-zinc alloy steel plate and its production method, which closes
Golden steel plate includes substrate steel sheet and the al-zn alloy coating positioned at substrate of steel plate surface, should on the basis of the total amount of substrate of steel plate
Substrate of steel plate contains the C to 0.1 weight %, the Mn of 0.15-0.35 weight %, 0.001-0.02 weight % more than 0.03 weight %
Ti, the Nb of 0.005-0.03 weight %, the Al of 0.01-0.065 weight %, the Fe of 99.44-99.8 weight %.By in steel
Titanium and niobium are added in plate, further crystal grain thinning, improve plate surface quality and comprehensive performance, and passes through slab hot rolling, acid
Wash, cold rolling and hot-dip aluminizing kirsite, realize think gauge high intensity hot dipping alumin(i)um zinc alloy steel sheet product in continuously dip coat unit
On online batch production.But the patent is mainly for 1.2mm and 1.5mm thickness colour picture tube anti explosion band yield strengths
More than 420MPa grades of hot dip aluminum zinc plate is higher using Nb microalloyings, cost of alloy.
Patent CN 1542158A disclose a kind of hot-dip coating aluminium-zinc alloy steel plate and its manufacture method, for building trade steel
Structure and auto parts and components etc..Using cold-rolled steel sheet after electrochemical degreasing, heat treatment, by aluminium zinc solution hot dip in cold-rolled steel sheet just
On reverse side, then cool down through wind turbine, finishing, drying, hydraulic cutter are finished product.But it is SPCD that the invention, which is related to substrate, is not directed to height
The hot-dip aluminizing zinc technology and surface quality technology controlling and process of strong steel.
Patent CN101352946B provides a kind of deep-draw hot-dip aluminizing zincium steel plate/belt and its production method.Its substrate component
(wt%) it is C≤0.01, Si≤0.12, Mn≤0.6, P≤0.1, S≤0.045, Ti≤0.3, surplus is for Fe and inevitably
Impurity；By ungrease treatment, annealing and hot dip, finished product yield strength is obtained up to 140~220MPa, and tensile strength is up to 260
~350MPa, elongation percentage are more than 30%.But the hot-dip coating aluminium-zinc alloy plate cannot meet that building structure is closed with, household electrical appliances with hot-dip aluminizing zinc
Flash plating, high intensity, great surface quality requirement needed for golden plate.
Patent CN104060165A discloses a kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof, its substrate component
(Wt%) it is 0.04~0.12C, 0.2~0.6Mn, 0.02~0.1P, 0.01~0.05Ti, 0.02~0.07Al ,≤0.05Si,
≤ 0.015S, surplus are Fe and inevitable impurity；With reference to rolling mill practice (950~1100 DEG C of hot fine rolling inlet temperature, end
Roll 820~900 DEG C of temperature, 600~700 DEG C of coiling temperature, cold rolling total reduction 50~80%), continuous annealing (annealing temperature
680~820 DEG C) and hot-dip aluminizing zinc technique can obtain structure with high-strength hot-dip aluminizing zincium steel plate.But the patent of invention is using at micro- titanium
Reason, the control to N content are not required, and it is larger to be likely to result in performance inconsistency, it is impossible to steady production.
Patent CN103911551B discloses a kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof, its substrate component
(Wt%) it is 0.01~0.039C, 0.15~0.19Mn ,≤0.015P, 0.005~0.025Ti, 0.02~0.07Al ,≤
0.05Si ,≤0.015S, surplus are Fe and inevitable impurity；With reference to rolling mill practice (hot fine rolling inlet temperature 900~
1050 DEG C, 850~900 DEG C of finishing temperature, 700~750 DEG C of coiling temperature, cold rolling total reduction 60~80%), continuous annealing
(750~800 DEG C of annealing temperature) and hot-dip aluminizing zinc technology process can obtain 250~310MPa yield strengths, 300~380MPa resists
The hot-dip coating aluminium-zinc alloy steel plate of tensile strength.The standby structure of the patent system with the yield strength of hot dip aluminum zinc plate be not up to 350MPa with
On, it is impossible to meet the mechanical property requirements of S350GD+AZ steel plates.
In conclusion or the hot-dip coating aluminium-zinc alloy steel plate yield strength and tensile strength of prior art production are poor, it is impossible to
Meet the requirement of building structure use, household electrical appliances hot-dip coating aluminium-zinc alloy steel plate, otherwise quality of coating is bad, it is of high cost, it should not promote
Use.
The content of the invention
The technical problem to be solved in the present invention is：The hot-dip coating aluminium-zinc alloy steel plate yield strength and tension of prior art production
The problems such as intensity difference, quality of coating is bad, and production cost is high.
The present invention solve technical problem technical solution be：There is provided a kind of structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate and
Its preparation method.
The present invention provides a kind of structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate, its base material component is：By weight percentage
Meter, C0.05%~0.12%, Si≤0.05%, Mn 0.2%~0.5%, P 0.04%~0.08%, S≤0.015%, Ti
0.02~0.04%, Als 0.010~0.080%, surplus are Fe and inevitable impurity.
Preferably, said structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate, its base material component are：By weight percentage, C
0.07~0.10%, Si≤0.04%, Mn 0.3%~0.4%, P 0.04%~0.06%, S≤0.015%, Ti
0.020%~0.035%, Al0.010%~0.05%, surplus are Fe and inevitable impurity.
A kind of preparation method the present invention also provides said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, including following step
Suddenly：
Smelting-hot rolling-cold rolling-cleaning-annealing-hot-dip aluminizing zinc-plating postcooling-finishing-straightening-surface treatment-oiling-volume
Take, hot-dip coating aluminium-zinc alloy steel plate is made；
Slab heating temperature is 1230~1260 DEG C during the hot rolling, and time inside furnace is 180~300min, hot rolling finish to gauge temperature
Spend for 850~890 DEG C；The annealing temperature is 720~780 DEG C, and annealing time is 45~85s；The coiling temperature for 580~
640℃。
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, in the cold rolling step, control
Total reduction is 44~80%.The total reduction refers to the ratio of thickness before the total Reducing thickness of strip and rolling, stagnation pressure
Lower rate=(h0-h1)/h0；H0 is the thickness before rolling, and h1 is the thickness after rolling.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, the cleaning uses alkali cleaning, alkali
Washing trough free alkalinity is 65~80Pt, and temperature is 70~85 DEG C；The control of electrolytic cleaning solution free alkalinity is 65~80Pt, and temperature is
70~90 DEG C, Faradaic current control is 6500~7500A.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, in the hot-dip aluminizing zinc step
Bath temperature is 575~585 DEG C, and it is 580~600 DEG C that substrate, which enters the zine plate temperature before zinc pot,.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, in the hot-dip aluminizing zinc step
Air knife purging pressure is 12~20KPa, and air knife is highly 250~350mm, and air knife is away from 23~30mm of strip.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, in the hot-dip aluminizing zinc step
It is 20~65% that air quantity is moved during zinc-plated postcooling.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, the finishing step controls light
Whole elongation percentage is 0.2~0.5%, and straightening elongation percentage is 0.2~0.4%.
Further, for the finishing step using rolling force control mode, the roll-force is 130~180t.
Wherein, in preparation method of the said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, the surface treatment step is adopted
With chromium-free deactivation, roller coat application roll is 130 ﹕ 70 with the fast ratio of dipping liquid roller roller, and upper roller roll-in is 50~110daN, and lower roll roll-in is 70
~140daN.
Beneficial effects of the present invention are：The present invention provides a kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof, by adopting
With 0.15~0.20%C and P, Ti microalloy treatment of low cost, with the use of rational rolling and continuous zinc/aluminium/aluminium zinc coating work
Skill is produced ferrite grain size and is controlled respectively in 75%~90% and more than 11 grades, ferrite and pearlite relative volume fraction
10%~25% high-strength hot-dip aluminizing zincium steel plate of fine grain, zine plate yield strength >=350MPa of the present invention, tensile strength for 420~
560MPa, elongation percentage ＞ 20%, thickness of coating is thin, is 0.4~2.0mm, and zinc is spent uniform, fine and close, and zinc-plated effect is good.The present invention
Method composition design is simple, technology controlling and process window is big and adaptability is stronger, and product surface quality is excellent.
Figure of description
Fig. 1 show the metallographic microstructure figure of the hot-dip coating aluminium-zinc alloy plate of the preparation of the embodiment of the present invention 1；
Fig. 2 show the metallographic microstructure figure of hot-dip coating aluminium-zinc alloy plate prepared by comparative example 1 of the present invention；
Fig. 3 show the metallographic microstructure figure of hot-dip coating aluminium-zinc alloy plate prepared by comparative example 4 of the present invention.
Embodiment
The present invention provides a kind of structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate, its base material component is：By weight percentage
Meter, C 0.05%~0.12%, Si≤0.05%, Mn 0.2%~0.5%, P0.04%~0.08%, S≤0.015%,
Ti0.02~0.04%, Al 0.010~0.080%, surplus are Fe and inevitable impurity.
Preferably, said structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate, its base material component are：By weight percentage, C
0.07~0.10%, Si≤0.04%, Mn 0.3%~0.4%, P 0.04%~0.06%, S≤0.015%, Ti
0.020%~0.035%, Al 0.010%~0.05%, surplus are Fe and inevitable impurity.
The reason for present invention selection each component of base material for：Carbon (C) is the important element for influencing plate property, when carbon content increases
Added-time, armor plate strength improve, but forming property and welding performance reduce., can be with when carbon content scope is 0.05~0.12%
The intensity of hot-dip coating aluminium-zinc alloy steel plate is improved by obtaining certain pearlite hardening constituent relative volume fraction；Also, according to
Iron-carbon phase diagram, 17%~24% pearlite can be obtained under equilibrium state, and increase carbon can reduce other alloys come the mode strengthened
The additive amount of element, so as to reduce cost of alloy, therefore, the carbon content control of base material of the present invention is 0.05~0.12%, preferably
For 0.07~0.10%.
Manganese (Mn) is solution strengthening element, and increase manganese content can improve intensity, while be combined into MnS with sulphur, prevent because
The fire check caused by FeS is formed, but during manganese excess, spot welding characteristics reduce, and therefore, suitable manganese content is 0.2~0.5%,
It is preferred that 0.3~0.4%.
Phosphorus (P) element is cost-effective solution strengthening element, and increase phosphorus content can improve intensity, but P elements easily exist
Cyrystal boundary segregation, cause it is cold short, therefore, after comprehensive consideration, by phosphorus content control 0.04~0.08%, preferably 0.04~
0.06%.
The nitrogen that micro titanium (Ti) can be fixed in steel in base material of the present invention forms TiN, and TiC is separated out in annealing process,
TiN has the function that crystal grain thinning, and TiC is acted on precipitation strength；But when Ti content is excessive, its invigoration effect tends to saturation,
Therefore, Ti content control is in 0.02~0.04%, preferably 0.025~0.035%.
Aluminium (Al) element main function is the oxygen removed in steel, avoids forming non-metallic inclusion in process of setting, together
When in the form of aluminium nitride fix steel in nitrogen, but excessive aluminium will influence steel welding performance and coating adhesion.Therefore,
Aluminium content is controlled in 0.02~0.07%, preferably 0.04~0.05%.
Silicon (Si) and sulphur (S) remain presence as inevitable impurity, more low better.With the increase of silicone content,
The enrichment of surface of steel plate silicon is obvious after heat treatment, influences the platability of steel plate, causes surface of steel plate plating leakage point defect, influence steel plate
Corrosion resistance and surface quality；Sulphur has adverse effect on the plasticity of steel plate, easily causes hot-short, considers steel making working procedure
Economy and the effect of Ca processing, its content is limited and is less than 0.015%.
A kind of preparation method the present invention also provides said structure with Thin Specs hot-dip coating aluminium-zinc alloy steel plate, including following step
Suddenly：
Smelting-hot rolling-cold rolling-cleaning-annealing-hot-dip aluminizing zinc-plating postcooling-finishing-straightening-surface treatment-oiling-volume
Take, hot-dip coating aluminium-zinc alloy steel plate is made；
Slab heating temperature is 1230~1260 DEG C during the hot rolling, and time inside furnace is 180min~300min, and hot rolling is whole
Temperature is rolled for 840~900 DEG C；The annealing temperature is 720~780 DEG C, and annealing time is 45~85s；The coiling temperature is
580~640 DEG C.
Wherein, hot-rolled temperature and time, annealing temperature and time and coiling temperature are all to last hot-dip coating aluminium-zinc alloy
Armor plate strength and elongation percentage influence very big.Slab heating temperature and time inside furnace when keeping suitable hot rolling, it is ensured that Ti etc.
Alloying element is fully solid-solution in austenite, while avoids that iron scale is blocked up under long-time high temperature or superheating phenomenon occurs；Keep
Suitable finishing temperature, it is ensured that austenitic area rolls, and avoids mixed grain structure occur in two-phase section rolling；Keep suitable volume
Temperature is taken, fine ferrite grain and pearlitic structrure can be obtained, increases alloy strength.
Annealing temperature of the present invention is 720~780 DEG C, and annealing time is 45~85s.Annealing temperature less than 720 DEG C or
Annealing time is less than 45s, steel plate recrystallization can be made incomplete, also there are deformed microstructure, intensity is extremely high, and plasticity is poor, moves back at the same time
Fiery temperature is too low to influence platability when easily the thin gauge strip is entered zinc pot since temperature is low；If annealing temperature is higher than 780 DEG C
Or annealing time is more than 85s, then recrystal grain is roughened, and cannot get the recrystallized structure of fine uniform, and intensity will be less than target
Value.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, in order to realize thinned, the excellent plate shape of acquisition and size
Precision, while deformation energy storage is provided for recrystallization annealing, control cold rolling total reduction is 44%~80%.Under the cold rolling stagnation pressure
Rate refers to the ratio of thickness before the total Reducing thickness of strip and rolling, i.e. before total reduction=(h0-h1)/h0, h0 is rolling
Thickness, h1 be rolling after thickness.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, the cleaning uses alkali cleaning, alkaline bath free alkalinity
For 65~80Pt, temperature is 70~85 DEG C；The control of electrolytic cleaning solution free alkalinity is in 65~80Pt, and temperature is 70~90 DEG C, electricity
Current control is solved in 6500~7500A.Free alkalinity is less than 65Pt, then cannot fully clean belt steel surface Residual oil, iron scale,
Iron powder, influences strip surface quality；Degreaser is then wasted higher than 80Pt, increases production cost.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, bath temperature is 575 in the hot-dip aluminizing zinc step
~585 DEG C, substrate enters zinc pot temperature for 580~600 DEG C.Bath temperature is less than 575 DEG C, then flow of the electrolyte is poor, and influence can plate
Property；Plating solution is higher than 585 DEG C, and plating solution and substrate reaction are fierce, make alloy-layer increasing layer, reduce the combination power of coating.Substrate enters zinc pot
Temperature easily causes bath temperature around strip and fluctuates, reduce platability less than 580 DEG C or higher than 600 DEG C.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, air knife purges pressure in the hot-dip aluminizing zinc step
12~20KPa, air knife is highly 250~350mm, away from 23~30mm of strip.Air knife height, distance and purging pressure unmatched,
Coating uniformity is influenced, the surface defects such as zinc flow liner, zinc scar, zinc fluctuating occurs.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, in the hot-dip aluminizing zinc step during zinc-plated postcooling
Mobile air quantity is 20~65%, and is mutually coordinated with strip operating rate and belt steel thickness, and mobile air quantity is less than 20%, then zinc liquid is not
Can quickly it solidify, zinc is spent thick uneven, influences beautiful and corrosion resistance of surface, while can prevent top roller dross, reduces knurl print and lacks
Fall into；Mobile air quantity is higher than 65%, then plating solution is not combined fully with substrate, while also zinc is spent inequality.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, the finishing is using rolling force control mode, rolling
Power is 130~180t, and finishing elongation control is 0.2~0.5%, straightening elongation percentage 0.2~0.4%.Finishing and straightening can have
Effect improves belt plate shape, obtains uniform burnishing zinc flower.Ensureing plate shape feelings in order not to destroy coating, finishing and straightening elongation percentage
Under condition, it is as small as possible preferably.
Wherein, in the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, the surface treatment step uses chromium-free deactivation, roller
It is 130 ﹕ 70 that application roll, which is applied, with the fast ratio of dipping liquid roller roller, and upper roller roll-in is 50~110daN, and lower roll roll-in is 70~140daN, is ensured
Uniform film thickness is stablized, and has no obvious aberration.
Explanation is further explained to the embodiment of the present invention below by embodiment, but does not indicate that and sends out this
Bright protection domain is limited in described in embodiment in scope.
The preparation method of slab is as follows described in embodiment and comparative example；
1st, process route and steel grades
(1), steel is poured with Q235G, concentration is arranged production.
(2), process route
Desulfurizing iron → converter → LF → 1#, 2#CC → hot rolling → pickling (Chengdu plate) → cold rolling (Chengdu plate) → heat
Aluminum-zinc alloy (Chengdu plate).
(3), chemical composition (being shown in Table 1)
1 chemical composition of table, %
2nd, converter smelting
(1), the trade mark is made steel：S350GD3.
(2), stove molten iron, half steel [S]≤0.015% are entered.
(3), 1665-1695 DEG C of tapping temperature
(4), tapping carries out molten steel pre-deoxidation with ferro-aluminum, adds quantity and is performed by table 2.
2 terminal of table [C%] and the relation of Fe-Al additions
(5), alloy addition sequence：Ferro-aluminum, mid-carbon fe-mn.Tapping process adds 400-500kg active limes into ladle
With 100-120kg fluorites, slag adjusting agent 200kg or calcium carbide 20kg is added after tapping.
(6), determine oxygen after chain-wales Argon 3min, according to oxygen content mend and feed aluminum steel, target Als presses 0.04%-
0.06% control, aluminum steel feed quantity referring to table 3 regulation.
Chain-wales Al line feed quantities after 3 stove of table
(7), chain-wales Argon in line feeding, Argon strength control are blowing top of the slag diameter 300mm~400mm open, are forbidding steel
Water acutely seethes, and Argon 5min~8min is must continue to after line feeding, is sampled after Argon.
3rd, molten steel furnace external refining
(1), LF, which enters the station, adds slag foaming agent 200kg or calcium carbide 20-40kg, adds high alkalinity refining slag 200kg.
(2), [Als] feeds aluminum steel after LF stoves regard stove, and feed quantity is shown in Table 4.Aluminum steel is fed in Argon, argon blowing time is not after line feeding
Less than 4 minutes.It is not required to the heat of secondary line feeding, it is also necessary to Argon, argon blowing time more than 4 minutes.
4 LF stoves of table feed aluminum steel amount
| Als/% | ≤0.010 | 0.011-0.020 | 0.021-0.030 | 0.031-0.040 | 0.041-0.050 | ＞ 0.050 |
| Feed aluminum steel amount, m/ stoves | 400 | 300 | 200 | 150 | 50 | Do not feed |
(3), Ti microalloyings, alloy fine setting and phosphorus alloy are carried out to ladle chemistry
Alloy fine setting is carried out depending on ladle chemistry, target chemical component is shown in Table 5, Ti microalloyings in heating latter stage.
5 LF processes of table processing target chemical component/%
| Chemical element | C | Mn | P | Ti | Als |
| Target component | 0.18 | 0.35 | 0.035 | 0.050 | 0.040 |
Soft argon blowing time >=6 minute after alloying, ensure that molten steel face is not exposed during soft blow argon.
(4), LF stoves out-station temperature (being shown in Table 6)
6 LF out-station temperatures of table, DEG C
| Heat | The first stove of bag time | Second stove rises |
| 1#CC | 1585~1600 | 1575~1590 |
| 2#CC | 1595~1610 | 1585~1600 |
4th, continuous casting
(1), even poured with Q235G, linking base is offline.
(2), covering slag：Low-alloy steel covering slag.
(3), middle bag target temperature：1535-1560 DEG C, liquidus temperature range is 1520 DEG C.
(4), secondary cooling water table is：1#CC is 13#, 2#CC is 3#。
(5)、1#CC 0.9-1.2m/min；2#CC 0.9-1.3m/min。
(6), it is to prevent strand slag, require crystallizer soft argon blowing, stable crystalline device liquid level and pulling rate.
(7), the 1st stove of often bag time production must offline stand inspection.
Use slab prepared by the above method to carry out hot-dip aluminizing zinc for raw material, prepare hot-dip coating aluminium-zinc alloy steel plate.
Embodiment 1 prepares hot-dip coating aluminium-zinc alloy steel plate with the method for the present invention
By the use of the slab with the chemical composition shown in table 7 as raw material, through being heated in 1240 DEG C of heating furnaces, time inside furnace is
253min, through 5 passage roughing, entry temperature at finishing is 1050 DEG C, and through 6 rack hot continuous rollings, finishing temperature is 871 DEG C, before
Section is cooled to 618 DEG C and batches, and cooling reduction ratio is 72%, is carried out on continuous zinc/aluminium/aluminium zinc coating unit with 100m/min unit speeds
Cleaning by degreasing, annealing, aluminum-zinc alloy.In 75Pt, temperature is 80 DEG C for wherein alkaline bath free alkalinity control；Electrolytic cleaning solution free alkali
Degree control is in 75Pt, and temperature is 85 DEG C, and Faradaic current is controlled in 7000A.Annealing soak temperature is 754 DEG C, and soaking time is
55s.Bath temperature is 585 DEG C during hot-dip aluminizing kirsite, and substrate enters zinc pot temperature for 586 DEG C.Air knife purges pressure 18KPa,
Air knife is highly 300mm, away from strip 28mm.Movement air quantity opens 45% when plating postcooling.Finishing elongation control is drawn 0.35%
Rectify elongation percentage 0.3%.Using chromium-free deactivation, roller coat application roll is with dipping liquid roller roller speed than being 130：70, upper roller roll-in is 100daN,
Lower roll roll-in is 80daN, obtains ferrite grain size and is respectively for 12 grades, ferrite and pearlite tissue relative volume fraction
90% and 10%, excellent surface quality, the hot-dip coating aluminium-zinc alloy plate of high intensity, see Fig. 1.
Embodiment 2 prepares hot-dip coating aluminium-zinc alloy steel plate with the method for the present invention
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
Embodiment 3 prepares hot-dip coating aluminium-zinc alloy steel plate with the method for the present invention
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
Embodiment 4 prepares hot-dip coating aluminium-zinc alloy steel plate with the method for the present invention
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
Embodiment 5 prepares hot-dip coating aluminium-zinc alloy steel plate with the method for the present invention
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
Comparative example 1 prepares hot-dip coating aluminium-zinc alloy steel plate with different technological parameters
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
In comparative example 1, due to the constituent content such as C, Mn, P, Ti deficiency in component, content of pearlite in alloy etc. is caused to strengthen tissue
Less than 5%, make intensity less than 350MPa.
Comparative example 2 prepares hot-dip coating aluminium-zinc alloy steel plate with different technological parameters
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to 1 method of embodiment.Different process parameter controls are shown in Table 8.
In comparative example 2, since the constituent content such as C, Mn, P, Ti is excessive in component, cause intensity very high, elongation percentage deficiency.
Comparative example 3 prepares hot-dip coating aluminium-zinc alloy steel plate with different technological parameters
Component presses 1 embodiment 1 of table, and technique prepares hot-dip coating aluminium-zinc alloy steel plate, different technique ginseng according to 1 method of embodiment
Number control is shown in Table 8.
Due to slab heating temperature and soaking time deficiency, alloying element is caused fully to go deep into austenite, can not
Its invigoration effect is played, causes intensity insufficient.
Comparative example 4 prepares hot-dip coating aluminium-zinc alloy steel plate with different technological parameters
Component presses 1 embodiment 1 of table, and technique prepares hot-dip coating aluminium-zinc alloy steel plate, different technique ginseng according to 1 method of embodiment
Number control is shown in Table 8.
Since finishing temperature is low, there is pearlite banded structure, see Fig. 3.
Comparative example 5 prepares hot-dip coating aluminium-zinc alloy steel plate with different technological parameters
Component presses 1 embodiment 1 of table, and technique prepares hot-dip coating aluminium-zinc alloy steel plate, different technique ginseng according to 1 method of embodiment
Number control is shown in Table 8.
Since annealing temperature and annealing soak time are grown, cause ferrite crystal grain to be roughened, make its intensity insufficient.
7 different substrate materials of table prepare hot-dip coating aluminium-zinc alloy steel plate
8 different disposal technique of table prepares hot-dip coating aluminium-zinc alloy steel plate
Hot-dip coating aluminium-zinc alloy steel plate performance prepared by embodiment and comparative example is as shown in table 9 below.
The hot-dip coating aluminium-zinc alloy steel plate performance prepared under 9 different substrate materials of table and treatment process
From embodiment and comparative example result, the present invention controls suitable heat by the suitable base material of selection component
The parameters such as temperature and time inside furnace, finishing temperature and coiling temperature are rolled, thickness specification can be prepared in 0.4~2.0mm, tool
There is yield strength to be not less than 350MPa, 420~560MPa tensile strength, the elongation percentage not less than 20%, thickness of coating is thin, zinc flower
Uniformly, fine and close hot-dip coating aluminium-zinc alloy steel plate.The method of the present invention is easy to operate, suitable promotion and implementation, and the hot-dip aluminizing zinc of preparation closes
Golden plate property is excellent, has great importance.
Claims (10)
1. structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is characterised in that base material component is：By weight percentage, C
0.05%~0.12%, Si≤0.05%, Mn 0.2%~0.5%, P 0.04%~0.08%, S≤0.015%, Ti 0.02
~0.04%, Als 0.010~0.080%, surplus are Fe and inevitable impurity.
2. structure according to claim 1 Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is characterised in that base material component is：
By weight percentage, C 0.07~0.10%, Si≤0.04%, Mn 0.3%~0.4%, P 0.04%~0.06%, S≤
0.015%, Ti 0.020%~0.035%, Al 0.010%~0.05%, surplus are Fe and inevitable impurity.
3. the preparation method of the structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate described in claim 1 or 2, it is characterised in that bag
Include following steps：
Smelting-hot rolling-cold rolling-cleaning-annealing-hot-dip aluminizing zinc-plating postcooling-finishing-straightening-surface treatment-oiling-batches-
Finished product；
Slab heating temperature is 1230~1260 DEG C during the hot rolling, and time inside furnace is 180min~300min, hot rolling finish to gauge temperature
Spend for 850~890 DEG C；The annealing temperature is 720~780 DEG C, and annealing time is 45~85s；The coiling temperature for 580~
640℃。
4. the structure according to claim 3 preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is characterised in that：Institute
State in cold rolling step, it is 44~80% to control total reduction.
5. the preparation method of the structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate according to claim 3 or 4, its feature exist
In：Bath temperature is 575~585 DEG C in the hot-dip aluminizing zinc step, and it is 580~600 DEG C that substrate, which enters the zine plate temperature before zinc pot,.
6. according to claim 3~5 any one of them structure preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is special
Sign is：Air knife purging pressure is 12~20KPa in the hot-dip aluminizing zinc step, and air knife is highly 250~350mm, air knife away from
23~30mm of strip.
7. according to claim 3~6 any one of them structure preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is special
Sign is：It is 20~65% to move air quantity in the hot-dip aluminizing zinc step during zinc-plated postcooling.
8. according to claim 3~7 any one of them structure preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is special
Sign is：It is 0.2~0.5% that the finishing step, which controls finishing elongation percentage, and straightening elongation percentage is 0.2~0.4%.
9. according to claim 3~8 any one of them structure preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, it is special
Sign is：For the finishing step using rolling force control mode, the roll-force is 130~180t.
10. according to claim 3~9 any one of them structure preparation method of Thin Specs hot-dip coating aluminium-zinc alloy steel plate, its
It is characterized in that：, the surface treatment step uses chromium-free deactivation, and roller coat application roll is 130 ﹕ 70 with the fast ratio of dipping liquid roller roller, upper roller
Roll-in is 50~110daN, and lower roll roll-in is 70~140daN.
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Cited By (6)
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| CN108504912A (en) * | 2018-05-26 | 2018-09-07 | 马鞍山钢铁股份有限公司 | A kind of small zinc flower hot-dip aluminizing zinc steel plate and its production method containing rare earth |
| CN109750146A (en) * | 2019-01-15 | 2019-05-14 | 象山华鹰塑料工程有限公司 | A kind of automotive window panel hot-dip aluminizing alloy-steel plate manufacturing process |
| CN110607476A (en) * | 2019-09-30 | 2019-12-24 | 柳州钢铁股份有限公司 | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
| CN110699606A (en) * | 2019-09-30 | 2020-01-17 | 柳州钢铁股份有限公司 | Cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110607476A (en) * | 2019-09-30 | 2019-12-24 | 柳州钢铁股份有限公司 | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
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| CN114703426A (en) * | 2022-04-08 | 2022-07-05 | 马鞍山钢铁股份有限公司 | Zinc-aluminum-magnesium coating high-strength steel plate and method for efficiently producing high-strength steel plates with different strength levels |
| CN114959385A (en) * | 2022-05-24 | 2022-08-30 | 首钢京唐钢铁联合有限责任公司 | High-strength aluminum-zinc-magnesium coating, color coated sheet and preparation method thereof |
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