CN102363857B - Method for producing color-coated plate for structure with yield strength of more than or equal to 550 MPa - Google Patents
Method for producing color-coated plate for structure with yield strength of more than or equal to 550 MPa Download PDFInfo
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Abstract
The invention relates to a method for producing color-coated steel sheet for a structure. The method comprises the following steps of: smelting, namely desulfurizing by molten iron, smelting by a converter, casting continuously to form a blank and performing hot rolling; performing acid washing; performing cold milling; annealing continuously; performing hot dipping on aluminum and zinc; and polishing, straightening, performing color coating and packaging for later use. In the method, the yield strength RP 0.2 (or ReH) is between 550 and 600 MPa; the tensile strength Rm is between 560 and 610 MPa; and the percentage elongation after break A80 mm is more than or equal to 6 percent. A neutral salt mist test is performed for 1,200 hours, a coating does not have bubbling and corrosion phenomena. At present, the annealed color-coated plate of which the metallographic structure is ferrite and pearlite or the ferrite and free cementite or the ferrite and the pearlite and less free cementite cannot achieve the effect, and the production cost can be reduced by 10 to 15 percent. By the method, special occasions which have high-yield strength and are used for cooling chambers of automobiles, arch coverings and the like can be met, and a process is simple and easy to implement.
Description
Technical field
The present invention relates to the steel alloy production technical field, belong to the production method that structure is used the color coating slab, the structure production method of colour coated plate that is specially yield strength 〉=550MPa.
Background technology
China's colour coated plate is mainly used in building field, and wherein the ratio of sandwich board and corrugated panel has just accounted for about 85% of colour coated plate for building, and require to have high strength, good toughness and good erosion resistance.To improve the intensity of structural part, weight reduction reduces cost to domestic many users (particularly construction industry user) Structure of need with colour coated plate.
By document resource both domestic and external is retrieved, find Chinese patent application number and be CN99810709.3, by B En Geer, KD is grace suddenly, the patent documentation of " a kind of method of making cold-strip or sheet material " of KD Shi Mite invention, it relates to by C, Al, Ti, V, Nb mostly is respectively 0.2% and Si most, Mn mostly is 1% most respectively, boron (＞0.78 * N) with the fixed nitrogen aequum, all the other low alloy steel that consist of iron and inevitable impurity are made the method for cold-strip or sheet material, cold-strip 520～780 ℃ of sufficiently long for some time of lower annealing temperature so that perfect recrystallization.This patent documentation is a kind of cold-rolled steel sheet of finishing recrystallize, and is different from metallographic structure of the present invention, and the plate property that causes is different.Other has number of patent application: the Chinese patent literature of CN200810180707.X, its disclosed this hot-dip coating aluminium-zinc alloy steel plate comprises substrate of steel plate and is positioned at the al-zn alloy coating on substrate of steel plate surface, take the total amount of substrate of steel plate as benchmark, this substrate of steel plate contain (weight percent) greater than 0.03% to 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 its described al-zn alloy coating is 70～100g/m
2The content of aluminium can be 50～65wt% in the al-zn alloy coating, the content of zinc is 35～50wt%, the thickness of this invention be 1.5 millimeters hot-dip coating aluminium-zinc alloy steel plate yield strength (ReL) up to 420MPa, tensile strength (Rm) up to 460MPa, the tensile strength of this steel plate is lower than 540MPa, it is because the alloy amounts such as Ti, Nb that add in steel are high, cause production cost high, therefore, then the market competitiveness is poor to make precoated substrate with this class high strength galvanized steel plate, is difficult to apply.
Development along with the colour coated plate technology, progressively begin to consider Eco-power structure is applied in the colour coated plate as substrate with the plate golding aluminium zinc alloy plate, but still the deficiency that exists is: in order to guarantee the structure high strength of color coating base material, usually in steel, added more alloying element, but after having added more alloying element in the steel, improved on the one hand the production cost of structure with colour coated plate; On the other hand, in the alloying element that in high strength precoated layer steel, adds (such as Mn, Si, Al, Cr, P, Ti, Nb, Mo etc.), in the cold rolling recrystallization annealing process of some element (such as Mn, Si, Ti, Nb, Al etc.) before galvanizing easily at surface enrichment, generate the thin oxide film of one deck, reduce the sticking power of zinc coating, caused the solidity to corrosion of colour coated plate to descend.Therefore, the researchist is devoted to develop a kind of structure colour coated plate that has simultaneously low cost, high strength, excellent corrosion resistance always both at home and abroad.
In the prior art, the temperature that adopts continuous annealing furnace to anneal general all 680 ℃ and more than, the highest reaches 780 ℃, the deficiency of its existence is: after continuous annealing, the metallographic structure of steel plate is ferrite+perlite or ferrite+free cementite, or ferrite+perlite+a small amount of free cementite.Such metallographic structure meeting cause its yield strength do not reach 550MPa and more than, thereby can not be used for the special occasions that automobile refrigerated tank, arch covering etc. need high-yield strength.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, it is that ferrite+deformation bands is brilliant that a kind of metallographic structure after continuous annealing is provided, to improve yield strength at 550～600MPa, can satisfy the special occasions of needs high-yield strengths such as being used for automobile refrigerated tank, arch covering, and technique is simple, the structure easy to implement production method of colour coated plate.
Realize the measure of above-mentioned purpose:
The structure of the yield strength 〉=550MPa production method of colour coated plate, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.03%～0.05%, Si :≤0.02%, Mn:0.15%～0.25%, P :≤0.015%, S :≤0.012%, Als:0.02%～0.06%, N :≤0.005%, Ti :≤0.005%, Nb :≤0.0045%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 55～65%;
4) carry out continuous annealing, annealing temperature is controlled at 600 ℃～650 ℃, and annealing time was at 20～60 seconds; After annealing, requiring its metallographic structure is that ferrite+deformation bands is brilliant; Described deformation bands crystalline substance refers to not finish the banded structure of recrystallize;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 60～150g/m
2, the component of its coating and weight percent are: Al:49%～60%, and Zn:38%～50%, Si:1%～2%, and the temperature that control enters the zinc pot with steel is at 600 ℃～630 ℃, the temperature of control aluminium zinc liquid is at 570 ℃～590 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
Structure of the present invention is 0.6mm～1.5mm with the thickness of colour coated plate, and Double-side hot plate golding aluminium zinc alloy coating weight is 60～150g/m
2, the content of Al is 49～60% in the coating; The content of Zn is that the content of 38～50%, Si is 1～2%.Characteristics of the present invention just are through annealing temperature to be 600～650 ℃ continuous annealing, and in annealing time was 20～60 seconds scopes, making its metallographic structure was ferrite+deformation bands brilliant (recrystallize is not also finished).Thereby make it composition simple (not adding Ti, Nb), the Mn alloy amount of adding is also under the less condition, its yield strength R
P0.2(or R
EH) reach 550～600MPa; Tensile strength R
mBe 560～610MPa; Elongation after fracture A
80mm6%.Behind the neutral salt spray test 1200 hours, coating is without foaming, non-corroding.This is that the present metallographic structure after annealing is ferrite+perlite or ferrite+free cementite, or ferrite+perlite+colour coated plate of free cementite can not reach on a small quantity, it is compared with the colour coated plate production cost with general same level high-strength structure, can reduce by 10～15%.
Description of drawings
Accompanying drawing is that the metallographic structure that the present invention produces is the metallographic structure figure of ferrite+deformation bands crystalline substance
Among the figure: piece shape be ferrite, with strip is that deformation bands is brilliant.
Embodiment
The below is described further:
Embodiment 1
The structure of the yield strength 〉=550MPa production method of colour coated plate, steel plate thickness is 0.6 millimeter, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.05%, Si:0.013%, Mn:0.25%, P:0.015%, S:0.012%, Als:0.05%, N:0.0021%, Ti:0.002%, Nb:0.001%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 65%;
4) carry out continuous annealing, annealing temperature is controlled at 600 ℃～605 ℃, annealing time 60 seconds; After annealing, metallographic structure is that ferrite+deformation bands is brilliant;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 150g/m
2, the component of its coating and weight percent are: Al:49%, and Zn:50%, Si:1%, and the temperature that control enters the zinc pot with steel is at 600 ℃, the temperature of control aluminium zinc liquid is at 570 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
After testing, yield strength R
P0.2Be 600MPa, tensile strength Rm is 610MPa, elongation after fracture A
80mmBe 6%, neutral salt spray test is after 1200 hours, and coating is without foaming, non-corroding.
Embodiment 2
The structure of the yield strength 〉=550MPa production method of colour coated plate, steel plate thickness is 0.8 millimeter, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.04%, Si:0.011%, Mn:0.20%, P:0.02%, S:0.011%, Als:0.06%, N:0.0015%, Ti:0.003%, Nb:0.002%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 61%;
4) carry out continuous annealing, annealing temperature is controlled at 615 ℃～620 ℃, annealing time 50 seconds; After annealing, metallographic structure is that ferrite+deformation bands is brilliant;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 120g/m
2, the component of its coating and weight percent are: Al:53%, and Zn:45.5%, Si:1.5%, and the temperature that control enters the zinc pot with steel is at 610 ℃, the temperature of control aluminium zinc liquid is at 580 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
After testing, yield strength R
P0.2Be 550MPa, tensile strength Rm is 560MPa, elongation after fracture A
80mmBe 12%, neutral salt spray test is after 1200 hours, and coating is without foaming, non-corroding.
Embodiment 3
The structure of the yield strength 〉=550MPa production method of colour coated plate, steel plate thickness is 1.0 millimeters, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.03%, Si:0.020%, Mn:0.18%, P:0.01%, S:0.009%, Als:0.02%, N:0.0025%, Ti:0.001%, Nb:＜0.001%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 58%;
4) carry out continuous annealing, annealing temperature is controlled at 645 ℃～650 ℃, annealing time 20 seconds; After annealing, metallographic structure is that ferrite+deformation bands is brilliant;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 60g/m
2, the component of its coating and weight percent are: Al:57%, and Zn:41%, Si:2%, and the temperature that control enters the zinc pot with steel is at 630 ℃, the temperature of control aluminium zinc liquid is at 590 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
After testing, yield strength R
P0.2Be 590MPa, tensile strength Rm is 600MPa, elongation after fracture A
80mmBe 8%, neutral salt spray test is after 1200 hours, and coating is without foaming, non-corroding.
Embodiment 4
The structure of the yield strength 〉=550MPa production method of colour coated plate, steel plate thickness is 1.2 millimeters, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.038%, Si:0.008%, Mn:0.22%, P:0.009%, S:0.02%, Als:0.03%, N:0.0028%, Ti:0.003%, Nb:0.002%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 56%;
4) carry out continuous annealing, annealing temperature is controlled at 625 ℃～630 ℃, annealing time 40 seconds; After annealing, metallographic structure is that ferrite+deformation bands is brilliant;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 80g/m
2, the component of its coating and weight percent are: Al:58%, and Zn:41%, Si:1%, and the temperature that control enters the zinc pot with steel is at 620 ℃, the temperature of control aluminium zinc liquid is at 585 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
After testing, yield strength R
P0.2Be 570MPa, tensile strength Rm is 590MPa, elongation after fracture A
80mmBe 9%, neutral salt spray test is after 1200 hours, and coating is without foaming, non-corroding.
Embodiment 5
The structure of the yield strength 〉=550MPa production method of colour coated plate, steel plate thickness is 1.5 millimeters, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.045%, Si:0.015%, Mn:0.16%, P:0.018%, S:0.008%, Als:0.04%, N:0.0015%, Ti:＜0.001%, Nb:0.001%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 55%;
4) carry out continuous annealing, annealing temperature is controlled at 610 ℃～615 ℃, annealing time 35 seconds; After annealing, metallographic structure is that ferrite+deformation bands is brilliant;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 100g/m
2, the component of its coating and weight percent are: Al:60%, and Zn:38%, Si:2%, and the temperature that control enters the zinc pot with steel is at 615 ℃, the temperature of control aluminium zinc liquid is at 575 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
After testing, yield strength R
P0.2Be 575MPa, tensile strength Rm is 585MPa, elongation after fracture A
80mmBe 11%, neutral salt spray test is after 1200 hours, and coating is without foaming, non-corroding.
Claims (1)
1. the structure of yield strength 〉=550MPa is with the production method of colour coated plate, its step:
1) smelts: carry out desulfurizing iron, converter smelting, continuous casting and become component and weight percent to be: C:0.03%～0.05%, Si :≤0.02%, Mn:0.15%～0.25%, P :≤0.015%, S :≤0.012%, Als:0.02%～0.06%, N :≤0.005%, Ti :≤0.005%, Nb :≤0.0045%, all the other are continuously cast bloom and the hot rolling of Fe and inevitable impurity;
2) carry out pickling;
3) carry out cold rollingly, control accumulative total draft is 55%～65%;
4) carry out continuous annealing, annealing temperature be controlled at 600 ℃～less than 630 ℃, annealing time was at 20～60 seconds; After annealing, requiring its metallographic structure is that ferrite+deformation bands is brilliant; Described deformation bands crystalline substance refers to not finish the banded structure of recrystallize;
5) carry out hot-dip aluminizing zinc, control Double-side hot aluminum-zinc alloy metal level weight is 60～150g/m2, the component of its coating and weight percent are: Al:49%～60%, Zn:38%～50%, Si:1%～2%, and the temperature that control enters the zinc pot with steel is at 600 ℃～630 ℃, and the temperature of control aluminium zinc liquid is at 570 ℃～590 ℃;
6) carry out polishing, straightening, color coating, packaging process and stand-by.
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