CN100390306C - Metal-coated strip - Google Patents
Metal-coated strip Download PDFInfo
- Publication number
- CN100390306C CN100390306C CNB2004800138730A CN200480013873A CN100390306C CN 100390306 C CN100390306 C CN 100390306C CN B2004800138730 A CNB2004800138730 A CN B2004800138730A CN 200480013873 A CN200480013873 A CN 200480013873A CN 100390306 C CN100390306 C CN 100390306C
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- China
- Prior art keywords
- band
- steel band
- metal
- end part
- heat treatment
- Prior art date
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- Expired - Fee Related
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- 239000002184 metal Substances 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 100
- 239000010959 steel Substances 0.000 claims abstract description 100
- 238000000576 coating method Methods 0.000 claims abstract description 55
- 239000011248 coating agent Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 8
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 8
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
- 229910000838 Al alloy Inorganic materials 0.000 claims description 18
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 18
- 238000005406 washing Methods 0.000 claims description 16
- 239000011701 zinc Substances 0.000 claims description 15
- 230000004927 fusion Effects 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000007669 thermal treatment Methods 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 230000004308 accommodation Effects 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 238000009499 grossing Methods 0.000 abstract description 2
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 230000002950 deficient Effects 0.000 description 14
- 238000000137 annealing Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000005473 Guinier-Preston zone Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 210000004894 snout Anatomy 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- 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
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
- C23C2/004—Snouts
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—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
- C23C2/12—Aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- 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
- C21D11/00—Process control or regulation for heat treatments
Abstract
A method of producing a metal-coated, recovery annealed, and thereby high tensile strength, steel strip is disclosed. The includes the steps of heat treating the steel strip in a heat treatment furnace (5), thereafter hot-dip metal coating the strip in a bath (6) of molten coating metal and thereby forming a metal coating on the steel strip, and thereafter conditioning the surface of the metal-coated steel strip at a conditioning station (8) by smoothing the surface of the strip. The method is characterised by controlling the temperature of an outlet end section of the heat treatment furnace to be (i) sufficiently high to minimise condensation of metal vapour in the outlet end section and/or (ii) substantially constant to minimise destabilisation of metal/metal oxide deposits on the walls of the outlet end section that could release deposited material onto strip passing through the outlet end section.
Description
Technical field
The present invention relates to the steel band of metallizing.
The present invention especially but not only relate to washing, recover annealed (recovery annealed), thereby have the steel band of high-tensile, this steel band is suitable as coating circuit charging (paint line feed).
In this article, term " recovers annealing " and is interpreted as steel band has been carried out thermal treatment, makes microtexture experience minimum restoring, if recrystallization is arranged, the recrystallization of minimum degree just, and this recrystallization is limited in regional area, for example Dai edge.
Thereby the present invention especially but not only relate to and recover the steel band that annealing has high-tensile, this steel band has corrosion resistant metallic coating and can be brushed, cold-forming afterwards (for example by roll forming (roll forming)) is the product of end-use, for example covers product (roofing products).
Thereby the present invention especially but not only relate to and recover the steel band that annealing has high-tensile, and this steel band has corrosion resistant metallic coating on tape, and paint coatings (paintcoating) is arranged on this metallic coating.
The present invention especially but not only relate to the corrosion resistant metallic coating of aluminum/zinc alloy form.
The present invention especially but not only relate to washing, recover annealed, thereby have the steel band of high-tensile, this steel band is made by hot dip coating method (hot-dip coating method).
Background technology
In conventional hot dipping stain metal coat (hot-dip metal coating) method, steel band passes through one or more heat treatment furnaces usually, enters then and pass through to remain on the fusion coating metal bath (bath) that applies in the jar, and this molten metal is aluminum/zinc alloy for example.Can arrange described stove, make the steel band level pass stove.Can arrange that also described stove makes steel band vertically pass stove and through guide roller and lower steering roll on one group.By heating inductor (inductor), the metallizing that will apply usually in the jar keeps fusion usually.Described band is separated heat treatment furnace via outlet end usually, and this outlet end is divided into the outlet of still chute of the prolongation in the immersion bath or the form of spout (snout).Band also upwards takes out from bathe through one or more sedimentation rollers (sink roll) in bath.Leave apply to bathe after, described band is through the coating thickness station, for example air knife or gas wiping (gas wiping) are stood, and make the coated surface of band stand the injection of wiping gas (wiping gas) in this gas wiping station, with the thickness of control coating.Coating is with by cooling segment and is forced cooling then.Continue after the refrigerative band partly (to be also referred to as tempering rolling part) and tension levelling part (tension levelling section) through skin-pass (skin pass rolling).Station coiling skin-pass is crossed and smooth band reeling.
The main purpose of conventional skin-pass band is the surface (minimum thickness reduces) of accommodation zone, so that this smooth surface.In order to obtain high-quality brushing surface being with of washing, slick belt surface is important.
The main purpose of conventional tension levelling band is to make the band distortion, thereby makes its enough smooth so that further processing, for example in the applying coating circuit (paintcoating line) under (that is, 100m/min) at least operated at a high speed.
Summary of the invention
The applicant finds, make metal coated steel strip (thereby particularly recover the steel band that annealed has high-tensile, described steel band has minimal unrelieved stress, promptly unrelieved stress is not more than 100MPa) make can be consistent and reliably backing form band.From can be for the final user provides band (band of uniform quality), promptly the viewpoint of roll forming goods be seen, the present invention is an important invention.Theme of the present invention is the Australia's patent application 43836/01 fully with the applicant's name application.
In the context of the present invention, " unrelieved stress " is interpreted as the unrelieved stress that runs through tape thickness.Therefore, " unrelieved stress " that relates to herein should be understood that the unrelieved stress (through-thickkness residual stress) of impenetrating thickness.
The applicant also finds the band that has the Minimum Residual residue stress in order to make need be different from previously used condition lower epidermis dress rolling and tension levelling, and the long and is that this band is by rolling relatively gentlier.
The applicant also finds, compare with the band that the aluminum/zinc alloy of the high-tensile of making under conventional skin-pass and the tension levelling condition applies, influence thereby the recovery of making under light relatively rolling condition annealing has the easier surface imperfection of particular type that is subjected to of the band that is coated with aluminum/zinc alloy of high-tensile.The present invention relates to make this surface imperfection minimum.
Description of drawings
Mainly contain two class surface imperfection.Fig. 1,2a and 2b are the Photomicrographs of this two classes surface imperfection.Two class defectives all cause by Zn and ZnO grit, and this grit is before adding metallic coating to this band application and be deposited on the steel band.
Embodiment
Defect type shown in Fig. 1 is recesses/indentations (depression)/half hoop (half buckle) with comet shape, and the head of comet points to the working direction of band.Usually, the wide and 50-150mm length of this defective 20-50mm.This defective is caused by the Zn grit that generally this grit deposited on tape before described band is through the fusion coating metal bath.
The defect type that Fig. 2 a and 2b show is the rough coatings zone with very little aperture (pinhole), and it has the outward appearance of narrow strips shape.Usually this defective 10-90mm is wide long with 200-3000mm, can be relevant with hoop.General this defective causes that by " avalanche (avalanche) " of ZnO grit this grit deposited on tape before described band is through the fusion coating metal bath.
Notice that defective forms on tape, then band is carried out conventional skin-pass and the processing of tension levelling condition.But the outward appearance of this defective or this defective is tended to be removed by the conventional tension levelling of skin-pass band subsequently to small part.
From the viewpoint of the aesthstic attractive force of this band, this defective is undesirable.Usually to discard defective band, the high and waste of this cost.
In addition, described defective is influential to the linear velocity of coating circuit.Particularly, this defective makes need operate the paint line road under the speed lower than normal conditions, to guarantee with coating suitable cover cover tape.
The applicant finds that also Zn and ZnO grit tend to be following result: the Zn vapor condensation becomes Zn or ZnO particle on the quencher moiety of the outlet of still chute of the prolongation of heat treatment furnace or spout, this heat treatment furnace along the band travel direction near the upstream that applies jar, and subsequently with condensation particle release being with by chute or spout at this moment.Zn steam results from and applies jar.
The applicant also finds when the production line operation condition in chute or the spout (especially temperature) changes and has the variation of the steel of handling different grades, Zn or ZnO particulate discharge to be increased, and this makes and unstable (destablise) takes place and cause release particles from the Zn/ZnO settling Guinier-Preston zone (built-up layer) that the chute wall exists thus.
The present invention is based on such understanding, promptly by the temperature in chute or the spout is controlled to enough height, so that the condensation minimum of Zn steam on chute or spout wall, and/or be controlled to substantially constant, so that the Zn/ZnO on chute or spout wall is sedimental unstable minimum, this instability can cause sedimentary material to be discharged into being with through the exit end part, thereby make by Zn or ZnO particle through the outlet of still chute that prolongation or spout with on the surface imperfection minimum of formation of deposits, described band is to recover annealed, has high-tensile thus.
In context, " minimum surface imperfection " is interpreted as in the text to exist on the metallizing steel band of per 500 running meters and is no more than the 1 place defective of type as depicted in figs. 1 and 2.
In addition, in the text, " substantially constant " is interpreted as that temperature variation is not more than 20 ℃.
As above paid close attention to, according to the present invention, a kind of preparation washing is provided, has recovered annealing, thereby had the method for the steel band of high-tensile, it comprises the step that steel band is stood by heat treatment furnace, fusion coating metal bath and adjusting continuously, and:
(a) thermal treatment steel band in heat treatment furnace;
(b) hot dipping stain metal coat (hot-dip metal coating) steel band in the fusion coating metal bath, thus metallic coating on steel band, formed; With
(c) by making steel strip surface level and smooth (smooth), regulate the surface of this metal coated steel strip to stand in adjusting, and
The method is characterized in that: the temperature of heat treatment furnace exit end part is controlled to (i) enough height, so that the condensation of the metallic vapor of exit end part is minimum and/or be controlled to (ii) substantially constant, so that the metal/metal oxide on the outlet end bulkhead is sedimental unstable minimum, this instability can be discharged into sedimentary material being with through the exit end part.
According to the present invention, a kind of brushing, washing, recovery annealed for preparing also is provided, thereby the method with steel band of high-tensile, it comprises the step of steel band being passed through continuously heat treatment furnace, fusion coating metal bath/adjusting station and coating circuit, and:
(a) thermal treatment steel band in heat treatment furnace;
(b) hot dipping stain metal coat steel band in the fusion coating metal bath, thus metallic coating on steel band, formed;
(c) by making steel strip surface level and smooth, to regulate the surface of this metal coated steel strip at the adjusting station; With
(d) being with of regulating in the coating circuit forms paint coatings, and
The method is characterized in that: the temperature of heat treatment furnace exit end part is controlled to (i) enough height, so that the condensation of the metallic vapor of exit end part is minimum and/or (ii) be controlled to substantially constant, so that the metal/metal oxide on the outlet end bulkhead is sedimental unstable minimum, this instability can be discharged into sedimentary material being with through the exit end part.
By the operational condition of upstream in the control stove, the temperature of heat treatment furnace exit end part can be kept enough high.
By operational condition, the temperature of heat treatment furnace exit end part can be kept substantially constant by upstream in the control stove.
Particularly, the thermal treatment profile that changes band at needs with the manufacturing machine different in kind in just the preceding in the situation of the band of band (immediately preceding strip), this method is included in the thermal treatment profile as control band in one or more stove parts of exit end part upstream, with the mechanical properties of accommodation zone as required, and do not change the temperature of exit end part basically.
Export the isolated material (insulation material) of end parts so that the thermosteresis minimum in the exit end part can keep the temperature of heat treatment furnace exit end part enough high by suitable selection.
Export the isolated material of end parts so that the thermosteresis minimum in the exit end part can keep substantially constant with the temperature of heat treatment furnace exit end part by suitable selection.
Preferably, the metal of metallic coating is an aluminum/zinc alloy, and the metal/metal oxide settling is the Zn/ZnO settling.
Preferably, aluminum/zinc alloy contains the aluminium of at least 30% weight.
Preferably, described method comprises that the wall temperature with heat treatment furnace exit end part is controlled to be at least 450 ℃.
Preferably, described method comprises that the wall temperature with heat treatment furnace exit end part is controlled to be at least 480 ℃.
Preferably, described method comprises that the wall temperature with heat treatment furnace exit end part changes in the temperature range that is controlled at 40 ℃, more preferably in 20 ℃ temperature range.
Described stove can be any suitable stove, for example horizontal chamber oven or vertical heater.
Preferably, described stove and accessory has outlet of still chute or the spout that extends the prolongation in the balneation.
Term " high-tensile " is interpreted as that tensile strength is at least 450MPa.
More preferably the tensile strength of described steel band is 500MPa at least.
Preferably, regulate the unrelieved stress that the step (c) of steel band produces in steel band and be not more than 100MPa.
Preferably, the step (c) of adjusting steel band produces the unrelieved stress that runs through thickness of strips and is not more than 90MPa.
Preferably, the step (c) of regulating steel band makes steel strip surface level and smooth, thereby makes it be adapted at brushing in the coating circuit.
Preferably, the step (c) of regulating steel band makes steel strip surface level and smooth, thereby makes it enough level and smooth, so that brush in the 80% coating circuit of operating of its specified largest production linear velocity at least.
Preferably, the step (c) of regulating steel band makes band keep enough smooth (flat), so that brush in the coating circuit.
Term " enough smooth " is interpreted as in this article abides by suitable national standard, for example the Class A and the Class B flatness (flatness) of StandardAS/NZ 1365 regulations.
Preferably, the step (c) of adjusting steel band comprises the described steel band of rolling.
Can select the rolling condition as required, with the surface of accommodation zone and obtain being not more than the unrelieved stress of 100MPa.
Preferably, select the rolling condition, to obtain being not more than the unrelieved stress of 60MPa.
More preferably select the rolling condition, to obtain being not more than the unrelieved stress of 50MPa.
More preferably, select the rolling condition, to obtain being not more than the unrelieved stress of 30MPa.
Suitable rolling controlled variable comprises, for example, and any one in the following parameter or a plurality of:
(i) Dai elongation;
(ii) rolling power;
(iii) rolling amount of deflection (roll bending); With
(iv) entrance and exit tension force.
Preferably, the thickness of metal coated steel strip is not more than 1mm.
More preferably the thickness of metal coated steel strip is not more than 0.6mm.
According to the present invention, also provide washing, recover annealed, thereby the steel band with high-tensile, the unrelieved stress of described steel band is not more than 100MPa, and has the surface imperfection of the type as illustrated in fig. 1 and 2 that is no more than 1 place on the steel band of per 500 running meters.
Preferably, described steel band applies with aluminum/zinc alloy.
Preferably, this aluminum/zinc alloy contains the aluminium of at least 30% weight.
Preferably, the tensile strength of steel band is at least 450MPa.
More preferably the tensile strength of steel band is at least 500MPa.
According to the present invention, also provide brushing, washing, recovery annealing, thereby the steel band with high-tensile, the unrelieved stress of described steel band is not more than 100MPa, and has the surface imperfection of the type as illustrated in fig. 1 and 2 that is no more than 1 place on the steel band of per 500 running meters.
Preferably, described steel band applies with aluminum/zinc alloy.
Preferably, this aluminum/zinc alloy contains the aluminium of at least 30% weight.
Preferably, the tensile strength of steel band is at least 450MPa.
More preferably the tensile strength of steel band is at least 500MPa.
To further describe the present invention with reference to the accompanying drawings by embodiment, wherein:
Fig. 1 and Fig. 2 are the Photomicrographs of the surface imperfection of two kinds of main types the present invention relates to; With
Fig. 3 is the method according to this invention, is used to make the synoptic diagram of an embodiment of the tinuous production of metallizing steel band.
With reference to figure 3, at unwinding station (uncoiling station) 1 the cold-rolled steel roll coil of strip is launched, by welding machine 2 continuous unfolded long tape leader tail is linked to each other and weld, thereby form the long band of successive.
To be with then continuously by collection device (accumulator) 3, band cleaning part 4 and furnace module 5.Furnace module 5 comprises preheater, preheating reduction furnace and reduction furnace.
By strict control process parameters (process variable), thermal treatment band in furnace module, described processing parameter comprises: (i) temperature distribution in the stove, the (ii) concentration of furnace reduction gas, (iii) pass through the gas flow of stove and (iv) with the residence time in stove (being linear velocity).
Processing parameter in the control furnace module 5 makes the recovery annealing of steel produce the band of high-tensile, removes oxide coating from the surface of band, and removes residual oil and iron fines from the surface of band.
Then heat treated band is entered downwards and passes through through outlet nozzle and remain on the bath that applies the fusion coating metal (being generally aluminum/zinc alloy) in the jar 6 and use washing.By the heating inductor (not shown), the metallizing that applies in the jar keeps fusion.In bathing, band upwards takes out this band through the sedimentation roller and from bathe.
Leave to apply and bathe after 6, described band vertically passes through gas wiping station (not shown), and therein, the coated surface of band stands the wiping gas injection, with the thickness of control coating.
Make then and apply band process cooling segment 7 and force cooling.
Then, refrigerative applies band through rolling part 8, and this rolling part is by making belt surface level and smooth under the rolling condition, and to regulate the surface that applies band, described rolling condition produces the Minimum Residual residue stress in band, promptly be not more than 100MPa.Applying band is then reeled at the station 10 of reeling.
Aforesaid method is characterised in that: the temperature in the furnace module outlet nozzle is controlled to be enough height, so that from the condensation minimum of the metallic vapor (being generally Zn steam) of the coating jar 6 on the quencher moiety of outlet nozzle, and make the temperature in the outlet nozzle keep substantially constant, promptly within 20 ℃.Therefore, before entering the bath of molten metal that applies in the jar 6, above the band of process outlet nozzle minimum metal/metal oxide settling is arranged.At metallizing is under the situation of aluminum/zinc alloy, and the wall temperature of outlet nozzle should be at least 480 ℃.There is a large amount of selections to realize required temperature control.These selections comprise suitable selection isolation so that thermosteresis is minimum and keep the temperature homogeneous in the outlet nozzle and the thermal treatment profile of the outlet nozzle upstream of accommodation zone turning point.
Rolling part 8 can be any appropriate structures.
For example, rolling part 8 can be the conventional skin-pass assembly of existing washing circuit, four roller mill for example, this circuit be generation with the rolling condition of needed surface modulation and flatness and Minimum Residual residue stress under the control operation.
Also for example, rolling part 8 can be the conventional skin-pass assembly and the following current leveling assembly (downstream leveler assembly) of existing washing circuit, this circuit be generation with the rolling condition of required surface modulation and flatness and Minimum Residual residue stress under the control operation.
As special example, rolling part 8 can be the conventional skin-pass assembly of existing washing circuit and transverse bend (cross-bow) and the antiarch shape workshop section (anti-camber stages) of conventional following current leveling assembly, this circuit be generation with the rolling condition of required surface modulation and flatness and Minimum Residual residue stress under control move.
Consider the end-use of band and make the required middle processing treatment of end-use product, can limit the rolling condition with any suitable rolling parameter.In this article, for the rolling condition, processing treatment (for example being coated with brush) can make and be necessary to consider other character in the middle of end-use and the required band, for example Dai flatness.
When the flatness of band was the problem of special concern, in being coated with the situation of brush, it will be suitable carrying out two step rolling operations as common, and wherein second step related generally to and makes smooth band, kept unrelieved stress less than 100MPa simultaneously.
Usually, the rolling condition in rolling part 8 can limit with reference to following parameters: the tension force of the elongation of band, rolling power, rolling amount of deflection and band (comprising in rolling part 8 under the situation of inlet/outlet roll tensioning device (bridle))
Above-mentioned rolling condition is to produce the required surface modulation of the steel band of washing of the steel band form that aluminium/zinc applies and the typical rolling condition of flatness, this steel band is suitable as at 50m/min at least, preferred 100m/min at least, more preferably at least 150m/min down the coating of operation apply the feed of circuit.
The applicant finds that in test aforesaid method is as one man prepared the steel band of high-tensile all the time, this steel band per 500 running meters with on have the defective of the type as illustrated in fig. 1 and 2 be no more than 1 place.In the past, before the present invention, the applicant experience be per 100 running meters with on the such surface imperfection in 1 place is on average arranged.
Do not departing under the spirit and scope of the invention and can carry out many changes above-mentioned preferred embodiment.
In addition, although the preferred embodiment of described method comprises the rolling metal coated steel strip, the present invention is not limited to this, but extends to any suitable method that does not produce by making surface smoothing come accommodation zone surface above the 100MPa unrelieved stress.
Claims (24)
- One kind prepare washing, recover annealed, thereby have the method for the steel band of high-tensile, it comprises steel band continuously by heat treatment furnace, fusion coating metal bath and the step of regulating the station, and:(a) thermal treatment steel band in heat treatment furnace;(b) hot dipping stain metal coat steel band in the fusion coating metal bath, thus metallic coating on steel band, formed; With(c) by making steel strip surface level and smooth, regulate the surface of this metal coated steel strip to stand in adjusting, andThe method is characterized in that: the temperature of heat treatment furnace exit end part is controlled to (i) enough height, so that the condensation of the metallic vapor of exit end part is minimum and/or (ii) the wall temperature of the exit end part of heat treatment furnace is changed in the temperature range that is controlled at 20 ℃, so that the metal/metal oxide on the outlet end bulkhead is sedimental unstable minimum, this instability can be released in sedimentary material being with by the exit end part.
- 2. the method for claim 1, it comprises that the operational condition by upstream in the control stove keeps the temperature of the exit end part of heat treatment furnace to remain enough height.
- 3. claim 1 or 2 method, it comprises that the operational condition by upstream in the control stove changes the wall temperature of the exit end part of heat treatment furnace in the temperature range that is controlled at 20 ℃.
- 4. the method for claim 1, wherein, the thermal treatment profile that changes band at needs with the manufacturing machine different in kind in just the preceding in the situation of band, this method is included in the thermal treatment profile as control band in one or more stove parts of exit end part upstream, with the mechanical properties of accommodation zone as required, and do not change the temperature of exit end part.
- 5. the process of claim 1 wherein that the metal of metallic coating is an aluminum/zinc alloy, and the metal/metal oxide settling is the Zn/ZnO settling.
- 6. the method for claim 5, wherein aluminum/zinc alloy contains the aluminium of at least 30% weight.
- 7. the method for claim 5, it comprises that the wall temperature with the exit end part of heat treatment furnace is controlled to be at least 450 ℃.
- 8. the method for claim 7, it comprises that the wall temperature with the exit end part of heat treatment furnace is controlled to be at least 480 ℃.
- 9. the process of claim 1 wherein that the tensile strength of steel band is at least 500MPa.
- 10. the process of claim 1 wherein that the unrelieved stress that the step (c) of regulating steel band produces is not more than 100MPa in steel band.
- 11. the process of claim 1 wherein that the unrelieved stress that the step (c) of regulating steel band produces is not more than 90MPa in whole thickness of strips.
- 12. the process of claim 1 wherein that the step (c) of regulating steel band makes steel strip surface level and smooth, thereby make it be adapted at brushing in the coating circuit.
- 13. the process of claim 1 wherein that the step (c) of regulating steel band makes steel strip surface level and smooth, thereby make it enough level and smooth, so that in the coating circuit of 80% time operation of its specified largest production linear velocity at least, brush.
- 14. the process of claim 1 wherein that the step (c) of regulating steel band makes band keep enough smooth, so that in the coating circuit, brush.
- 15. the process of claim 1 wherein that the step (c) of regulating steel band comprises the described band of rolling.
- 16. a washing, recover annealed, thereby have the steel band of high-tensile, its unrelieved stress is not more than 100MPa, and there is the surface imperfection of the type as illustrated in fig. 1 and 2 that is no more than 1 place in the steel band of per 500 running meters.
- 17. the band of claim 16, wherein metallic coating comprises aluminum/zinc alloy.
- 18. the band of claim 17, wherein aluminum/zinc alloy contains the aluminium of at least 30% weight.
- 19. each band in the claim 16～18, wherein the tensile strength of steel band is at least 450MPa.
- 20. one kind prepares brushing, washing, recovery annealed, thereby has the method for the steel band of high-tensile, it comprises the step of steel band being passed through continuously heat treatment furnace, fusion coating metal bath, adjusting station and coating circuit, and:(a) thermal treatment steel band in heat treatment furnace;(b) hot dipping stain metal coat steel band in the fusion coating metal bath, thus metallic coating on steel band, formed;(c) by making steel strip surface level and smooth, to regulate the surface of this metal coated steel strip at the adjusting station; With(d) being with of regulating in the coating circuit forms paint coatings, andThe method is characterized in that: the temperature of heat treatment furnace exit end part is controlled to (i) enough height, so that the condensation of the metallic vapor of exit end part is minimum and/or (ii) the wall temperature of the exit end part of heat treatment furnace is changed in the temperature range that is controlled at 20 ℃, so that the metal/metal oxide on the outlet end bulkhead is sedimental unstable minimum, this instability can be discharged into sedimentary material being with through the exit end part.
- 21. a washing, recover annealed, thereby have the steel band of high-tensile, its unrelieved stress is not more than 100MPa, and has the surface imperfection of the type as illustrated in fig. 1 and 2 that is no more than 1 place on the steel band of per 500 running meters.
- 22. the band of claim 21, wherein metallic coating comprises aluminum/zinc alloy.
- 23. the band of claim 22, wherein aluminum/zinc alloy contains the aluminium of at least 30% weight.
- 24. each band in the claim 21～23, wherein the tensile strength of steel band is at least 450MPa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003901298A AU2003901298A0 (en) | 2003-03-19 | 2003-03-19 | Metal-coated strip |
| AU2003901298 | 2003-03-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1826418A CN1826418A (en) | 2006-08-30 |
| CN100390306C true CN100390306C (en) | 2008-05-28 |
Family
ID=31500341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800138730A Expired - Fee Related CN100390306C (en) | 2003-03-19 | 2004-03-19 | Metal-coated strip |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN100390306C (en) |
| AU (1) | AU2003901298A0 (en) |
| MY (1) | MY145574A (en) |
| NZ (1) | NZ542872A (en) |
| WO (1) | WO2004083466A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003901424A0 (en) | 2003-03-20 | 2003-04-10 | Bhp Steel Limited | A method of controlling surface defects in metal-coated strip |
| CN107338406A (en) * | 2017-05-16 | 2017-11-10 | 江苏鑫蕴模塑科技有限公司 | A kind of aluminum plating process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11286762A (en) * | 1998-04-01 | 1999-10-19 | Nippon Steel Corp | Continuous hot dipping method and apparatus therefor |
| US6706331B2 (en) * | 2000-11-08 | 2004-03-16 | Bhp Steel (Jla) Pty Ltd | Cold-formable metal-coated strip |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557953A (en) * | 1984-07-30 | 1985-12-10 | Armco Inc. | Process for controlling snout zinc vapor in a hot dip zinc based coating on a ferrous base metal strip |
| JPH06299310A (en) * | 1993-03-22 | 1994-10-25 | Praxair St Technol Inc | Method of preventing adherence of alloy to zinc plating roll |
| JPH093552A (en) * | 1995-06-23 | 1997-01-07 | Nippon Steel Corp | Continuous hot dip galvanizing equipment for effectively producing hot dip galvanized steel sheet |
| US6093452A (en) * | 1997-02-25 | 2000-07-25 | Nkk Corporation | Continuous hot-dip coating method and apparatus therefor |
-
2003
- 2003-03-19 AU AU2003901298A patent/AU2003901298A0/en not_active Abandoned
-
2004
- 2004-03-19 CN CNB2004800138730A patent/CN100390306C/en not_active Expired - Fee Related
- 2004-03-19 NZ NZ542872A patent/NZ542872A/en unknown
- 2004-03-19 MY MYPI20040988A patent/MY145574A/en unknown
- 2004-03-19 WO PCT/AU2004/000346 patent/WO2004083466A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11286762A (en) * | 1998-04-01 | 1999-10-19 | Nippon Steel Corp | Continuous hot dipping method and apparatus therefor |
| US6706331B2 (en) * | 2000-11-08 | 2004-03-16 | Bhp Steel (Jla) Pty Ltd | Cold-formable metal-coated strip |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003901298A0 (en) | 2003-04-03 |
| WO2004083466A1 (en) | 2004-09-30 |
| CN1826418A (en) | 2006-08-30 |
| MY145574A (en) | 2012-02-29 |
| NZ542872A (en) | 2007-03-30 |
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