CN104611534A - Ultra-low carbon cold-roll steel sheet and preparation method thereof - Google Patents
Ultra-low carbon cold-roll steel sheet and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of cold-rolled sheet and strip production, and in particular provides an ultra-low carbon cold-roll steel sheet and a preparation method thereof. The preparation method of the ultra-low carbon cold-roll steel sheet comprises the steps of hot rolling, reeling, cold rolling, annealing, finishing, drawing and straightening, wherein the reeling temperature is 700-730 DEG C, the cold rolling reduction rate is 70-85%, the annealing manner is continuous annealing, an intermediate plate blank obtained after cold rolling passes through a heating section, a soaking section, a primary cooling section, an over-aging section and a secondary cooling section sequentially, the temperature in the heating section is 780-800 DEG C and the heating time is 180-500s; the temperature in the soaking section is 830-850 DEG C and the soaking time is 60-180s; the final temperatures of the intermediate plate blank obtained after cold rolling is 670-700 DEG C, 380-430 DEG C and 430-460 DEG C in the primary cooling section, the over-aging section and the secondary cooling section, respectively, and the standing time is 50-120s, 160-500s and 10-20s, respectively; the mechanical property yield strength of the cold-rolled steel sheet obtained by the method is 170-240MPa, the tensile strength is equal to or more than 340MPa, and the percentage elongation after fracture is equal to or more than 40.0%. (Maths formulas are shown in the specification).
Description
Technical field
The invention belongs to cold rolled sheet production technical field, particularly relate to a kind of ultralow carbon cold-rolled steel plate and preparation method thereof.
Background technology
Along with the development of automobile industry, the requirement of market to automobile sheetsteel improves constantly, and under guarantee impact briquetting performance prerequisite, also needs to have certain intensity, reaches the target of cost efficiency.。The representational patent of soft steel steel plate is produced in continuous annealing following 2:
The continuous annealing process of (1) 200910029806.2 deep-draw and extra-deep drawing sheet steel
The invention discloses the continuous annealing process of a kind of deep-draw and extra-deep drawing sheet steel, steel plate passes through cleaning before annealing, enter continuous annealing furnace, speed 150 ~ 350m/min, adopt nitrogen hydrogen mixeding gas ejection surface of steel plate, steel plate is protected, anti-oxidation, make steel billet temperature be heated to 120 ~ 180 DEG C simultaneously; Again to steel plate heating, make its temperature reach 750 ~ 780 DEG C, and be incubated 40 ~ 70s; Then 400 ~ 460 DEG C are cooled to steel plate, and are incubated 60 ~ 300s and carry out Wetted constructures, be cooled to normal temperature subsequently.Owing to adopting overaging annealing process, the carbide in steel is fully separated out, ensure that household electrical appliances steel plate and auto sheet punching performance and ultra-deep punching performance.
(2) 201110052830.5 low temperature continuous annealing gap-free atom cold-rolled steel sheet and production methods thereof
The invention discloses a kind of production method of low temperature continuous annealing gap-free atom cold-rolled steel sheet, containing C:0.0005 ~ 0.0025%, Si :≤0.030%, Mn:0.05 ~ 0.15%, P≤0.015%, S≤0.010%, O≤0.025%, N :≤0.0025%, Al:0.015 ~ 0.050%, Ti:0.03 ~ 0.07%.All the other are by Fe and trace element.Even moving back temperature is 710 ~ 740 DEG C, cold rolling draft >=80%.By adopting rational chemical composition and suitable cold rolling draft, reducing recrystallization temperature and forming sufficient cold rolling heterogeneous microstructure, lower continuous annealing temperature can be adapted to, thus reduce costs and production difficulty.
But aforesaid method can not obtain the hot-dip galvanizing sheet steel that intensity and forming property have concurrently, and cost is higher.
Summary of the invention
The invention provides a kind of preparation method of ultralow carbon cold-rolled steel plate, the mechanical property of the cold-rolled steel sheet utilizing the method gained steel plate to obtain meets yield strength 170 ~ 240MPa, tensile strength>=340MPa, elongation after fracture>=40.0%, plastic strain ratio weighted mean
work hardening exponent
requirement; Thus meet there is some strength and can stamping forming requirement being carried out of market.
Technical scheme of the present invention:
First technical problem that the present invention will solve is to provide a kind of preparation method of ultralow carbon cold-rolled steel plate, and the method comprises: by slab successively through hot rolling, batch, cold rolling, annealing, cooling, polishing and straightening, wherein:
Described coiling temperature is 700 ~ 730;
Described cold rolling draft is 70 ~ 85%;
The mode of described annealing is continuous annealing, in described annealing process, the intermediate slab obtained after cold rolling is successively through heating zone, soaking zone, cooling section, overaging section and a cooling twice section, and the temperature of described heating zone is 780 ~ 800 DEG C, heat-up time 180 ~ 500s; The temperature of soaking zone is 830 ~ 850 DEG C, soaking time 60 ~ 180s; The intermediate slab obtained after cold rolling is respectively 670 ~ 700 DEG C, 380-430 DEG C and 430 ~ 460 DEG C in the terminal temperature of a described cooling section, overaging section and cooling twice section, and the residence time is respectively 50 ~ 120s, 160 ~ 500s, 10 ~ 20s;
Described slab consist of C:0.0010 ~ 0.0050%, Si :≤0.05%, Mn:0.30 ~ 0.80%, P:0.03 ~ 0.09%, S :≤0.010%, Ti:0.02 ~ 0.07%, Nb:0.01 ~ 0.05%, Als:0.010% ~ 0.060%, surplus is Fe and inevitable impurity composition.
Preferably, described hot rolling comprises roughing and finish rolling, and the start rolling temperature of described roughing is 1200 DEG C ~ 1230 DEG C, and the finishing temperature of described roughing is 1030 ~ 1160 DEG C, roughing time 200 ~ 300min; The start rolling temperature of described finish rolling is 1000 DEG C ~ 1070 DEG C, and the finishing temperature of described finish rolling is 900 DEG C ~ 930 DEG C.
Preferably, the thickness of the intermediate slab after described roughing is 47mm ~ 50mm.
Preferably, the thickness of the intermediate slab after described finish rolling is 3 ~ 6mm.
Preferably, anneal is carried out in continuous annealing furnace again, and the unit speed of described continuous annealing furnace is 100 ~ 200m/min.
Preferably, the unit elongation of described polishing is 0.3 ~ 0.7%.
Second technical problem that the present invention will solve is to provide a kind of ultralow carbon cold-rolled steel plate, and it is obtained by the preparation method of above-mentioned cold-rolled steel sheet.
Further, the yield strength 170 ~ 240MPa of described ultralow carbon cold-rolled steel plate, tensile strength >=340MPa, elongation after fracture >=40.0%,
Beneficial effect of the present invention:
The mechanical property of the cold-rolled steel sheet adopting the inventive method to prepare meets the yield strength 170 ~ 240MPa of described ultralow carbon cold-rolled steel plate, tensile strength>=340MPa, elongation after fracture>=40.0%,
requirement; Thus meet there is some strength and can stamping forming requirement being carried out of market.In addition, it is little that manufacturing process of the present invention implements difficulty, surface quality and high comprehensive performance, can continuous hot galvanizing transformation zinc-plated/connect the production method of moving back and dual purpose unit realizing a kind of high-strength ultra low-carbon steel cold-rolled steel sheet produced in batches.
The present invention defines the gordian technique of producing high-strength micro-carbon steel cold-reduced sheet on continuous annealing unit.The present invention and rolling technology control simple and adaptability comparatively by force, and product surface quality is excellent.
Embodiment
First technical problem that the present invention will solve is to provide a kind of preparation method of ultralow carbon cold-rolled steel plate, and the method comprises: by slab successively through hot rolling, batch, cold rolling, annealing, cooling, polishing and straightening, wherein:
Described coiling temperature is 700 ~ 730 DEG C;
Described cold rolling draft is 70 ~ 85%;
The mode of described annealing is continuous annealing, in described annealing process, the intermediate slab obtained after cold rolling is successively through heating zone, soaking zone, cooling section, overaging section and a cooling twice section, and the temperature of described heating zone is 780 ~ 800 DEG C, heat-up time 180 ~ 500s; The temperature of soaking zone is 830 ~ 850 DEG C, soaking time 60 ~ 180s; The intermediate slab obtained after cold rolling is respectively 670 ~ 700 DEG C, 380-430 DEG C and 430 ~ 460 DEG C in the terminal temperature of a described cooling section, overaging section and cooling twice section, and the residence time is respectively 50 ~ 120s, 160 ~ 500s, 10 ~ 20s;
Described slab consist of C:0.0010 ~ 0.0050%, Si :≤0.05%, Mn:0.30 ~ 0.80%, P:0.03 ~ 0.09%, S :≤0.010%, Ti:0.02 ~ 0.07%, Nb:0.01 ~ 0.05%, Als:0.010% ~ 0.060%, surplus is Fe and inevitable impurity composition.
In the present invention, described slab can adopt the known method preparing continuously cast bloom of this area to be prepared, such as can by obtaining described continuously cast bloom after blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrically heated, RH vacuum-treat and sheet billet continuous casting; Its condition specifically prepared is well known in the art.
Further, cold rollingly in preparation method of the present invention rear steel plate to be cleaned, described cleaning can adopt the purging method of the steel plate of this area routine, such as alkali cleaning and bath cleans, its objective is that the greasy dirt in order to remove hot rolled sheet metal surface, iron scale, iron powder etc. affect the impurity of plate surface quality.
In the present invention, the terminal temperature of a described cooling section refers to that the intermediate slab of cold rolling rear gained enters the temperature before cooling twice section through a cooling section; The terminal temperature of described cooling twice section refer to cold rolling after the intermediate slab that obtains enter the temperature before overaging section through cooling twice section.The terminal temperature of described overaging section refer to cold rolling after the intermediate slab that obtains through described overaging section enter eventually cold section time temperature.
Cold-reduced sheet is in order to ensure the stability of its performance, make it timeliness not occur within the quality guaranteed period to cause the sclerosis of steel plate, must carry out Wetted constructures, overaging is exactly make the carbide in steel separate out distribution uniformly at intracrystalline, reduce the carbon of solid solution in steel, reduce the ageing of finished steel plate.The temperature of overaging is very important to production, and temperature is high, and can make the ferrite carbon that still solid solution is a large amount of in steel after Wetted constructures, Wetted constructures does not add; Temperature is low, can reduce the activity of carbon, is not easy diffusion.
In the preparation method of ultralow carbon cold-rolled steel plate of the present invention, the processing condition do not limited, as the type of cooling, rate of cooling, type of heating etc., adopt this area routine techniques.
Second technical problem that the present invention will solve is to provide a kind of ultralow carbon cold-rolled steel plate, and it is obtained by the preparation method of above-mentioned cold-rolled steel sheet.
Further, the yield strength 170 ~ 240MPa of described ultralow carbon cold-rolled steel plate, tensile strength >=340MPa, elongation after fracture >=40.0%,
The preparation method of cold-rolled steel sheet of the present invention is: by usual desulfurizing iron, converter smelting, LF stove Ca process, RH decarburization, controls molten steel composition in above-mentioned scope, continuous casting becomes continuously cast bloom, be heated to 1200 DEG C ~ 1230 DEG C, time inside furnace 200 ~ 300min, carry out roughing.Hot rolling intermediate slab thickness at 47mm ~ 50mm, hot fine rolling start rolling temperature 1000 DEG C ~ 1070 DEG C, finishing temperature scope is 900 DEG C ~ 930 DEG C; 700 ~ 730 DEG C are cooled to batch in the section cooling mode of leading portion cooling after finish rolling.Thickness 3 ~ the 6mm of hot-rolled sheet.Hot-rolled sheet, after alkali cleaning cleans up, in the ability in conjunction with cold-rolling mill, is defined as 70% ~ 85%.The unit speed twisting in continuous annealing furnace after rolling is 100 ~ 200m/min, at soaking zone by steel plate heating and 830 ~ 850 DEG C; The belt steel temperature terminated in the slow cooling terminal of continuous annealing furnace, rapid cooling terminal, overaging controls at 670 ~ 700 DEG C, 430 ~ 460 DEG C and 380-430 DEG C respectively; Band steel is cooled to room temperature through water liquid bath, and carry out polishing, elongation control is 0.3 ~ 0.7%.
The present invention is described in detail by the following examples.
In following examples, the testing method of yield strength ReL, tensile strength Rm, elongation after fracture A80 is carried out according to GBT228-2002 metallic substance tensile testing at ambient temperature; The testing method of plastic strain ratio r90 is carried out according to the measuring method of GBT5027-2007 metal sheet and strip plastic strain ratio; Work hardening exponent n90 >=testing method carry out according to GBT5028-2008 metal sheet and strip tension strain hardenability value test method.Plastix strain weighted mean in following embodiment
wherein, r
0 °, r
45 °, r
90 °respectively in display plate plane topmost three directions and rolling direction be 0 °, 45 ° and 90 ° time etc. plastix strain value; In like manner, work hardening exponent weighted mean
Embodiment 1
The present invention is by usual desulfurizing iron, converter smelting, LF stove Ca process, RH decarburization, becomes continuously cast bloom as slab through continuous casting, and the weight percent of chemical composition is: C:0.002%, Si:0.01%, Mn:0.47%, P:0.055%, S:0.004%, Ti:0.041%, Nb:0.025%, Als:0.040%, surplus is Fe and inevitable impurity composition.
This heating of plate blank to 1222 DEG C is carried out roughing, and the roughing time is 245min, intermediate slab thickness 48mm after roughing, then the intermediate slab after roughing is carried out finish rolling, finish rolling start rolling temperature 1051 DEG C, finish rolling finishing temperature is 919 DEG C, and the thickness of the intermediate slab after finish rolling is 5.0mm; After finish rolling, slab is cooled to 712 DEG C to batch.In conjunction with the ability of cold-rolling mill, with the cold rolling draft of 80% on cold-rolling mill, be cold-rolled to the Cold Rolled Plate Thickness of 1mm.Adopted by cold-reduced sheet continuous annealing furnace to carry out anneal subsequently, the unit speed of annealing furnace is 113m/min, in heating zone, steel plate is heated to 841 DEG C of heating 130s; The belt steel temperature that the slow cooling terminal (cooling section) of continuous annealing furnace, rapid cooling terminal (cooling twice section), overaging terminate controls at 682 DEG C, 458 DEG C and 396 DEG C respectively; Polishing elongation control is 0.58%.
The yield strength of gained ultralow carbon cold-rolled steel plate, tensile strength, elongation after fracture,
be respectively 210MPa, 385MPa, 44.0,0.22,2.1.
Embodiment 2-3
The composition percentage ratio of slab is as shown in table 1, and concrete technology condition as Table 2,3; Additive method is with embodiment 1.Gained finished product mechanical property is as shown in table 4.
The chemical constitution of table 1 slab
Comparative example 1
The composition percentage ratio of slab is as shown in table 1, and it is not in the composition range that the present invention limits; Concrete technology condition is with embodiment 3; Additive method is with embodiment 1.Gained finished product mechanical property is as shown in table 4.
Comparative example 2
The composition percentage ratio of slab is with embodiment 1, as shown in table 1; As Table 2,3, it is not in the composition range that the present invention limits for concrete technology condition; Additive method is with embodiment 1.Gained finished product mechanical property is as shown in table 4.
The hot rolling of table 2 embodiment and comparative example and cold-rolling process
The annealing process of table 3 embodiment and comparative example
Table 4 embodiment and comparative example gained end properties
Claims (9)
1. the preparation method of ultralow carbon cold-rolled steel plate, the method comprises: by slab successively through hot rolling, batch, cold rolling, annealing, cooling, polishing and straightening, it is characterized in that:
Described coiling temperature is 700 ~ 730 DEG C;
Described cold rolling draft is 70 ~ 85%;
The mode of described annealing is continuous annealing, in described annealing process, the intermediate slab obtained after cold rolling is successively through heating zone, soaking zone, cooling section, overaging section and a cooling twice section, and the temperature of described heating zone is 780 ~ 800 DEG C, heat-up time 180 ~ 500s; The temperature of soaking zone is 830 ~ 850 DEG C, soaking time 60 ~ 180s; The intermediate slab obtained after cold rolling is respectively 670 ~ 700 DEG C, 380-430 DEG C and 430 ~ 460 DEG C in the terminal temperature of a described cooling section, overaging section and cooling twice section, and the residence time is respectively 50 ~ 120s, 160 ~ 500s, 10 ~ 20s;
Described slab consist of C:0.0010 ~ 0.0050%, Si :≤0.05%, Mn:0.30 ~ 0.80%, P:0.03 ~ 0.09%, S :≤0.010%, Ti:0.02 ~ 0.07%, Nb:0.01 ~ 0.05%, Als:0.010% ~ 0.060%, surplus is Fe and inevitable impurity composition.
2. the preparation method of ultralow carbon cold-rolled steel plate according to claim 1, it is characterized in that, described hot rolling comprises roughing and finish rolling, and the start rolling temperature of described roughing is 1200 DEG C ~ 1230 DEG C, the finishing temperature of described roughing is 1030 ~ 1160 DEG C, roughing time 200 ~ 300min; The start rolling temperature of described finish rolling is 1000 DEG C ~ 1070 DEG C, and the finishing temperature of described finish rolling is 900 DEG C ~ 930 DEG C.
3. the preparation method of ultralow carbon cold-rolled steel plate according to claim 1 and 2, is characterized in that, the thickness of the intermediate slab after described roughing is 47mm ~ 50mm.
4. the preparation method of ultralow carbon cold-rolled steel plate according to claim 1 and 2, is characterized in that, the thickness of the intermediate slab after described finish rolling is 3 ~ 6mm.
5. the preparation method of ultralow carbon cold-rolled steel plate according to claim 3, is characterized in that, the thickness of the intermediate slab after described finish rolling is 3 ~ 6mm.
6. the preparation method of the ultralow carbon cold-rolled steel plate according to any one of Claims 1 to 5, is characterized in that, described anneal is carried out in continuous annealing furnace, and the unit speed of continuous annealing furnace is 100 ~ 200m/min.
7. the preparation method of the ultralow carbon cold-rolled steel plate according to any one of claim 1 ~ 6, is characterized in that, described polishing unit elongation is 0.3 ~ 0.7%.
8. a ultralow carbon cold-rolled steel plate, is characterized in that, it is obtained by the method described in any one of claim 1 ~ 6.
9. ultralow carbon cold-rolled steel plate according to claim 8, is characterized in that, the yield strength of described ultralow carbon cold-rolled steel plate is 170 ~ 240MPa, tensile strength>=340MPa, elongation after fracture>=40.0%,
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| CN107699797A (en) * | 2017-11-24 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | 390MPa levels continuous annealing cold rolled automobile structural steel and iron and its production method |
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Application publication date: 20150513 |