CN101646796A - Ultra-thin cold-rolled steel sheet for building material and process for production of the same - Google Patents
Ultra-thin cold-rolled steel sheet for building material and process for production of the same Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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Abstract
The invention provides an inexpensive ultra-thin cold-rolled steel sheet for building material which is suitable for flat members of buildings such as interior and external walls and roofs and which has a thickness of 0.2mm or below and is excellent in strength and flatness. A steel sheet cold-rolled into a thickness of 0.2mm or below which has a composition containing by mass C: 0.01 to 0.10%, Si: 0.03% or below, Mn: 0.005 to 0.5%, P: 0.01 to 0.20%, S: 0.03% or below, Al: 0.01 to 0.1%, and N: 0.010% or below with the balance consisting of Fe and unavoidable impurities and which exhibits an average hardness (HR30T) of 68 to 83 with at least 90% of the sheet exhibiting widthwise hardness variations of within +-2 from the average hardness.
Description
Technical field
The present invention relates to ultra-thin cold-rolled steel sheet for building material and manufacture method thereof, particularly, give simultaneously as building materials and use needed intensity and planeness the ultra-thin cold-rolled steel sheet of thickness of slab below 0.2mm.
Background technology
In recent years, ultra-thin cold-rolled steel sheet increases as the demand of building materials purposes.That is to say, ultra-thin cold-rolled steel sheet is implemented surface treatments such as hot dip, plating, application according to the difference of purposes after, be fitted on the substrate of for example wooden or resin system etc., be used for the purposes such as inwall, outer wall and roof of buildings.
If with baseplate-laminating the time, produce edge wave (edge wave) or middle cardiac wave (center buckle) on the steel plate, then with baseplate-laminating after, form the gap between substrate and the steel plate easily, can produce problems such as the bad or corrosion of outward appearance, expect therefore that steel plate does not have the generation of edge wave or middle cardiac wave as far as possible and smooth.
In above-mentioned purposes, cold-rolled steel sheet almost is just to be used without processing.
In addition, in such purposes, with plasticities such as its attention ductility or r values, not as paying attention to thickness of slab precision, intensity, shape (planeness).That is to say, need ultra-thin, have high strength, the planeness estimated with edge wave or middle cardiac wave is good.
And, when being used for such use, also require cheapness as general purpose material.
Herein, manufacture method as ultra-thin cold-rolled steel sheet, for example disclose in the patent documentation 1 steel is not carried out process annealing, is cold-rolled to below the thickness of slab 0.5mm with cold rolling rate 80～99% through the coiled material after the hot rolling, wherein, described steel contains C≤0.010% and C+N≤0.012%, Si≤0.01%, Mn≤0.15%, P≤0.02%, S≤0.020%, and surplus is made of iron and unavoidable impurities.This technology is by reducing C content and N content in the steel, reduces the work hardening when cold rolling, can realize cold rolling under the high rolling rate producing ultra-thin steel sheet.
Yet the purposes as above-mentioned building materials are used requires high strength, and particularly, requiring yield strength YS is more than the 700MPa, but in the technology of patent documentation 1, realizes that the high strength after cold rolling is difficult.In addition, in above-mentioned technology, owing to must reduce C and N simultaneously, so the shortcoming that exists manufacturing cost to uprise.
Patent documentation 1: Japanese kokai publication hei 3-79726 communique
Summary of the invention
The present invention develops in view of above-mentioned present situation, purpose be to provide the flat board members such as inwall, outer wall or roof that are suitable for buildings, thickness of slab is below 0.2mm and the ultra-thin cold-rolled steel sheet for building material of the good cheapness of intensity and planeness and favourable manufacture method thereof.
Below, exploitation process of the present invention is described.
In addition, as former material, based on the general mild steel of cheapness.
When the ultra-thin cold-rolled steel sheet of thickness of slab below 0.2mm is used for the building materials purposes, when using, it must have the intensity (more than the yield strength YS:700Mpa) that planeness can not be compromised degree.
If only in order to improve intensity, then increase the C amount and get final product.Yet steel plate meeting hardening this moment is only by the rolling variation that can't avoid shape (planeness).
In addition, as the method that improves intensity, consider to implement rollingly down suppressing, but steel plate also can hardening in this case, only by the rolling variation that still can't avoid shape (planeness).
Therefore, cold rolling after, need to implement that shape correction is handled, preferred leveling is handled (levelertreatment) and corrected the steel plate shape.
Yet, to handle when correcting the steel plate shape by leveling at this, the surface hardness that need make the steel plate after cold rolling is in suitable scope, and the hardness deviation of hardness deviation, particularly plate width direction is few.
Therefore, the inventor is in order to be that former material manufacturing has the cold-rolled steel sheet that is fit to the surface hardness that the leveling after cold rolling handles with general mild steel, and one-tenth is grouped into and manufacture method has been carried out various researchs repeatedly.
Its result obtains following opinion: by optimizing hot-rolled condition, particularly finishing temperature and coiling temperature, help the purpose that reaches desired.The present invention is a basis with above-mentioned opinion.
That is to say that purport of the present invention is constructed as follows.
1. ultra-thin cold-rolled steel sheet for building material, it is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities, and be cold-rolled to below the thickness of slab 0.2mm, described steel plate is characterised in that, the average hardness of the steel plate after this is cold rolling (HR30T) is more than 68, below 83, and the hardness change of plate width direction average hardness ± 2 account for more than 90% of steel plate integral body with interior ratio.
2. ultra-thin cold-rolled steel sheet for building material is implemented shape correction to above-mentioned 1 described steel plate and is handled and obtain, and it is characterized in that the planeness of this steel plate is below 2mm, and yield strength (YS) is more than 700MPa.
3. the manufacture method of a ultra-thin cold-rolled steel sheet for building material is characterized in that, with the former material of steel be heated to Heating temperature more than 1150 ℃ after, in finishing temperature be more than 700 ℃, Ar
3Implement hot rolling under the condition below the point, be more than 500 ℃ at coiling temperature then, batch rolling below 750 ℃, make hot-rolled sheet, then with after this hot-rolled sheet pickling, in the cold rolling rate is more than 85%, be cold-rolled under the condition below 99% below the thickness of slab 0.2mm, wherein, the former material of described steel is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities.
4. the manufacture method of a ultra-thin cold-rolled steel sheet for building material is characterized in that, with the former material of steel be heated to Heating temperature more than 1150 ℃ after, in finishing temperature be more than 700 ℃, Ar
3Implement hot rolling under the condition below the point, be more than 500 ℃ at coiling temperature then, batch rolling below 750 ℃, make hot-rolled sheet, then with after this hot-rolled sheet pickling, in the cold rolling rate is more than 85%, be cold-rolled under the condition below 99% below the thickness of slab 0.2mm, and then implement shape correction and handle, wherein, the former material of described steel is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities.
5. ultra-thin cold-rolled steel sheet for building material, it is characterized in that, in quality %, contain that C:0.01% is above and 0.10% following, Si:0.03% is following, Mn:0.005% is above and 0.5% following, P:0.01% is above and 0.20% following, S:0.03% is following, Al:0.01% is above and 0.1% following, below the N:0.010%, surplus is made of Fe and unavoidable impurities, thickness of slab is below the 0.2mm, and planeness is below 2mm, and yield strength (YS) is more than 700MPa.
According to the present invention,, only use needed intensity and planeness by cold rolling just can giving simultaneously as building materials for the ultra-thin cold-rolled steel sheet for building material of thickness of slab below 0.2mm.
Description of drawings
Fig. 1 is that the expression thickness of slab is the figure of the relation of the preceding yield strength YS (MPa) of C content and the leveling processing of ultra-thin cold-rolled steel sheet of 0.120mm.
Embodiment
Below the present invention is specifically described.
At first, the one-tenth with light plate of the present invention being grouped into the reason that is limited in the above-mentioned scope describes.In addition, the unit of the content of each element is " quality % ", yet, except as otherwise herein provided, below only with " % " expression.
More than the C:0.01% and below 0.10%
C has solid solution in steel and improves the effect of the intensity of former material, yet can form carbide when its content surpasses 0.10%, and the load when cold rolling increases significantly, and becoming, to be difficult to obtain thickness of slab be the following cold-rolled steel sheet of 0.2mm.Therefore, in the present invention, from the viewpoint of cold-rolling property, make C amount on be limited to 0.10%.In addition, from the consideration of cold-rolling property aspect, expect to reduce the C amount, yet the remarkable reduction of C amount is relevant with the intensity reduction of steel plate, and the cost that C reduces when making steel is increased, becoming is difficult to provide at an easy rate former material.Therefore, from guaranteeing the aspect of intensity and cost, make the following of C amount be limited to 0.01%.From the viewpoint of cold-rolling property and cost, preferred C amount is more than 0.02%, below 0.07.
Recently,,, require further attenuate, the situation of requirement thickness of slab for the ultra-thin materials of about 0.12mm for example arranged from light-weighted viewpoint about the aforesaid ultra-thin cold-rolled steel sheet that uses on the substrate of wooden or resin system etc. that is fitted in.When making the steel plate attenuate, when the problem that is broken into, particularly attenuate when consequent leveling is handled became the about 0.12mm of thickness of slab, it is remarkable that this problem becomes.Fracture when preventing that leveling from handling, the softening that offers the steel plate of leveling processing is effective.
Therefore, when studying this point, the inventor finds, by adjusting C content closely, and the steel plate softening before leveling being processed, consequently, and even for the thin material of thickness of slab for about 0.12mm, the fracture in the time of also advantageously avoiding leveling to handle.
What represent among Fig. 1 is, about being essentially consist with Si:0.01%, Mn:0.16%, P:0.015%, S:0.017%, Al:0.020%, N:0.0021%, C is changed in 0.010～0.052% scope, thickness of slab is the ultra-thin cold-rolled steel sheet of 0.120mm, and the relation of the yield strength YS (MPa) before the processing of C content and leveling is studied and the result that obtains.
As shown in the drawing, yield strength increases along with the increase of C amount.
Then, to above-mentioned steel plate, implement leveling for 0.30% time at elongation and add man-hour, the C amount can obtain desired planeness before reaching 0.045%, yet the C amount surpasses 0.045% steel, add man-hour carrying out leveling in order to obtain desired planeness, steel plate must rupture.
That is to say that find when making thickness of slab be thinned to about 0.12mm, it is favourable that the C amount is set in below 0.045%.On the other hand, when thickness of slab is about 0.20mm,, can obtain desired planeness by the C amount is set at below 0.10%.
In addition, in the present invention, with the yield strength YS with the steel plate after the leveling processing be set in more than the 700MPa, more than the preferred 710MPa as target, as shown in Figure 1, by making the C amount is more than 0.015%, even the stage before leveling processing also can make YS more than 700MPa.At this moment, if the stage YS before leveling processing is more than the 700MPa, be the YS that can obtain after leveling more than 0.2% is processed more than the 700MPa then at elongation.Therefore, for the thin material of thickness of slab for about 0.12mm, in order to guarantee desired intensity (more than YS 〉=700MPa) after leveling processing, making the C amount is to be favourable more than 0.015%.
Below the Si:0.03%
Si is effectively as the element of the intensity that improves steel, yet a large amount of containing not only makes cold-rolling property reduce, and the surface rational faculty, chemical convertibility, erosion resistance are reduced, and therefore from this viewpoint the Si amount is defined as below 0.03%.
More than the Mn:0.005% and below 0.5%
Mn has the effect that suppresses thermal crack by S, thereby in order to obtain this effect, makes its content more than 0.005%.Preferred more than 0.01%, more preferably more than 0.05%.Yet, because the heavy addition of Mn not only makes the former material of steel plate hardization, cold-rolling property reduce, and the weld part plasticity after weldability and the welding is reduced, thereby the upper limit of Mn is made as 0.5%.In addition, when requiring better shape and erosion resistance, Mn measures preferably below 0.30%.
More than the P:0.01% and below 0.20%
P has the effect of the intensity that improves the former material of steel plate, and therefore making its content is more than 0.01%.Yet heavy addition reduces cold-rolling property.In addition, P tendency of segregation in steel is strong, causes the embrittlement of weld part.Therefore, in the present invention, make P on be limited to 0.20%.In addition, more preferably P is below 0.10%.
Below the S:0.03%
S is present in the steel as main inclusion, and erosion resistance is reduced, and therefore wishes to reduce its content as far as possible, at most only allows to have 0.03%.Therefore, in the present invention, the upper limit of S amount is made as 0.03%.In addition, there is no particular limitation for the lower limit of S amount, preferably reduces as mentioned above as far as possible, but from the angle of steel-making ability and cost, be preferably about 0.005%.
More than the Al:0.01% and below 0.1%
Al adds as reductor, is the element that improves the purity of steel, therefore adds on one's own initiative.Yet deoxidation effect is little during Al quantity not sufficient 0.01%, and inclusion is residual and plasticity is reduced.But the surperficial purity of steel plate descends when the Al amount surpasses 0.1%, therefore in the present invention the Al amount is defined as more than 0.01%, below 0.1%, and in addition, from the viewpoint of stable material quality, preferred Al is more than 0.02%, below 0.080%.
Below the N:0.010%
N is solid solution in steel plate, if content surpasses 0.010%, then makes the remarkable hardization of steel plate, therefore its content is made as below 0.010%.In addition, the not special restriction of the lower limit of N amount, but be preferably about 0.0010% from steel-making ability and cost consideration.
Surplus is made of Fe and unavoidable impurities.
Herein, as unavoidable impurities, have Cu, Ni, Cr, Mo, Nb, Ti and B etc., be each defined in preferably that following scope: Cu:0.20% is following, Ni:0.20% following, Cr:0.20% is following, Mo:0.20% is following, Nb:0.02% is following, Ti:0.02% is following, below the B:0.0010%.
More than the preferred component among the present invention formed be illustrated, yet like this and insufficient, importantly cold rolling back and shape correction handle the back satisfy below various prerequisites.In addition, below the leveling processing of handling as shape correction is illustrated.
That is to say, cold rolling after, the average hardness of steel plate is adjusted to being important in the scope of Rockwell hardness (HR30T) more than 68, below 83.
Because the hardness (hard degree) of the steel plate after cold rolling has a significant impact shape of product, so the hard degree among the present invention is of crucial importance.Therefore in the present invention, because the product thickness of slab as thin as a wafer, below 0.2mm, the hard degree is made as the assay plate surface and the plate surface hardness of trying to achieve.Test method is a standard with JIS Z 2245 " Rockwell hardness test method ".
During this average hardness (HR30T) less than 68, after handling, leveling guarantees that YS 〉=700Mpa is difficult, product takes place easily to fracture, on the other hand, when greater than 83 the time, the shape correction of handling by the leveling difficulty that becomes, it is remarkable that the variation of shape of product becomes, therefore, the average hardness of steel plate (HR30T) is limited in the scope more than 68, below 83.
In addition, in above-mentioned steel plate after cold rolling, the hardness change of plate width direction the average hardness of steel plate ± 2 what account for steel plate integral body with interior ratio also is important more than 90%.
The hardness change of plate width direction if surpass steel plate average hardness (HR30T) ± 2, shape variation when implementing leveling after then and handling, thus the hardness change of plate width direction average hardness ± 2 with interior be necessary.
In addition, the regulation of the hardness change of above-mentioned plate width direction not necessarily needs whole steel plate all to satisfy, as long as satisfy above-mentioned prerequisite more than at least 90%.
In addition, the average hardness of steel plate and the hardness change of plate width direction average hardness ± 2 with interior ratio, can obtain by following method.
At the front end 200m spacing place of length direction apart from cold-rolled steel sheet, to measuring apart from two ends 5mm portion and inboard equally spaced for example 7 places (amounting to 9 places) thereof on the plate width direction, with the mean value of the measured value of these length/plate width directions as average hardness.In addition, hardness 00000 variable quantity of plate width direction average hardness ± 2 with interior ratio, with total measure become in the number average hardness ± 2 proportional meters with interior mensuration number calculate.
In addition, the average hardness of steel plate and the hardness change of plate width direction average hardness ± 2 with interior ratio,, therefore also can followingly obtain simply because the hardness deviation of cold-rolled steel sheet length direction is little.
That is,, carry out repeatedly in the longitudinal direction and above-mentioned same mensuration, make and measure number and amount to more than 100 at the plate width direction place to the steel plate (cutting plate) of random length with product width, with the mean value of these measured values as average hardness.In addition, the hardness change of plate width direction average hardness ± 2 with interior ratio, become in the total mensuration number by the steel plate of the random length of trying to achieve like this average hardness ± 2 calculate with interior mensuration number.
In addition, after leveling was handled, it was important that the planeness of steel plate and tensile strength satisfy following scope.
Planeness: below the 2mm
Planeness is to try to achieve according to the method for record among the JIS G 3141 " cold-rolled steel sheet and steel band ".At this moment, planeness estimating by expression maximum strain in edge wave or the middle cardiac wave.
If this planeness surpasses 2mm, promptly edge wave or middle cardiac wave surpass 2mm, then hinder as product and use, and therefore, planeness is limited in below the 2mm.
Yield strength (YS): more than the 700MPa
When the not enough 700MPa of yield strength, to baseplate-laminating till processing the time easy deformation, planeness guarantee difficulty, therefore yield strength is limited to more than the 700MPa.More than the preferred 710MPa.
Then, manufacture method of the present invention is described.
The molten steel that to form by above-mentioned preferred component, use known stove meltings such as converter or electric furnace after, with continuous metal cast process or make known method such as base-cogging method, thin slab casting and make steel billet, thereby make the former material of steel.In these known method, consider from preventing the macrosegregation aspect, more preferably continuous metal cast process.
Then, the former material of steel is implemented heating, hot rolling.At this moment, if 1150 ℃ of the Heating temperature deficiencies of former material, then the resistance to deformation during hot rolling uprises, and rolling load increases, and therefore the difficulty thereby hot rolling becomes is made as Heating temperature more than 1150 ℃.In addition, in order to make the material homogenizing, also preferably be made as more than 1150 ℃.Yet, because when heating surpasses 1300 ℃, thickization of crystal grain, ductility reduces, so the upper limit of Heating temperature preferably is made as about 1300 ℃.
Then, implement hot rolling, this hot rolled finishing temperature is important among the present invention.
That is to say that finishing temperature is more than 700 ℃ by making, Ar
3Below the point, can obtain soft hot-rolled steel sheet, the load when cold rolling alleviates, and therefore can the thickness of slab precision obtain the following cold rolling material of desired thickness of slab: 0.2mm well.This respect, when 700 ℃ of finishing temperature less thaies, it is soft that hot-rolled sheet became, though thereby the load when cold rolling reduce, product wrecks, the shape of product variation.In addition, if finishing temperature is low than 700 ℃, then the load during hot rolling becomes greatly.Therefore, the finishing temperature of hot-rolled sheet is made as more than 700 ℃.On the other hand, if finishing temperature compares Ar
3The phase point temperature height, then hot-rolled sheet hardening, it is big that the load when cold rolling becomes, and cold-rolling property reduces.In addition, from the homogeneity of material, the viewpoint of surface texture, finishing temperature is preferably more than 750 ℃, below 830 ℃.
In addition, Ar
3Transformation temperature can be tried to achieve with following formula.
Ar
3Transformation temperature=901-325[%C]-92[%Mn]+33[%Si]+287[%P]
Wherein, be the content (quality %) of each element in [].
Coiling temperature: more than 500 ℃, below 750 ℃
By making coiling temperature is more than 500 ℃, crystal grain-growth, thickization after hot rolling finishes, and then thickization of carbide aggegation.Thus, can obtain soft hot-rolled sheet, the load when cold rolling reduces, and cold-rolling property improves.Yet, when coiling temperature surpasses 750 ℃ and when too high, it is many that the generation of surface scale becomes, may occur hot-rolled sheet not only surface texture and also cold rolling after the surface texture variation.Therefore, coiling temperature be made as more than 500 ℃, below 750 ℃.
In addition, the preferred upper limit value of coiling temperature is 700 ℃.
Then, after the pickling, by the cold rolling cold-reduced sheet of making.
There is no particular limitation for the pickling condition of hot-rolled sheet, as long as can remove surface scale.Therefore, can use known method, for example remove surface scale with acid such as hydrochloric acid, sulfuric acid.
Cold rolling is under rolling rate is condition more than 85%, below 99%, is rolling to below the thickness of slab 0.2mm.At this moment, if the rolling rate less than 85% when cold rolling, then need the thickness of slab of hot-rolled sheet is made as below the 1.3mm, guarantee that the above finishing temperature of temperature of being scheduled to becomes difficult, the load when rolling increases, or the temperature deviation in the coiled material becomes big, can't obtain desired material, on the other hand, rolling rate surpasses 99% rolling being difficult to carry out, therefore, rolling rate is limited in 85～99% the scope.
In addition, though also relevant with C content, when the rolling rate when cold rolling surpasses 96%, the situation of shape variation is arranged, the preferred less than 96% of rolling rate when therefore cold rolling is more preferably below 95%.
By above-mentioned cold rolling, can obtain thickness of slab below the 0.2mm, average hardness (HR30T) be more than 68, below 83 and the hardness change of plate width direction average hardness ± 2 be the ultra-thin cold-rolled steel sheet more than 90% of steel plate integral body with interior ratio.
Yet, only cold rolling by this, can only make planeness satisfy desired prerequisite.
Therefore, in this case, implement tension force leveling levelings such as (tension leveler) in cold rolling back and handle, improve planeness, and adjust intensity.
At this moment, desired planeness is below 2mm, and desired intensity is that yield strength (YS) is more than 700MPa.
In order to obtain above-mentioned planeness and intensity, be to implement leveling under the condition below 0.3% to handle preferably in extensibility.At this moment, if extensibility surpasses 0.3% steel plate hardization, might rupture at leveling processing light plate.
In addition, the plate surface hardness is for example under extensibility is condition below 0.3%, even also almost not change after leveling processing is counted about 1～2 point with HR30T.
In addition, in the above description, for example understand the leveling processing of handling as shape correction, but the present invention does not limit this,, all be suitable for so long as have the shape correction processing of handling effect same with leveling.
Steel plate after shape correction is handled can also be implemented surface treatment as required.
As the surface treatment of implementing, can be listed below method: after degreasing, the drying, chromate treating is implemented in pot galvanize afterwards; After degreasing, drying, the plating, implement color coating (color coating); Or after the drying, implement color coating etc.And, platings such as zinc-plated, nickel plating, or to plate various alloys, chemical conversion processing etc. all be suitable to the surface treatment that common cold-rolled steel sheet is suitable for.
Embodiment 1
The steel that becomes to be grouped into shown in the melting table 1 in converter is made the thick steel billet of 260mm with continuous metal cast process.Then, with above-mentioned steel billet hot rolling under the conditions shown in Table 2, cold rolling, making final thickness of slab is the following cold-rolled steel sheet of 0.2mm.In addition, plate is wide is 1000mm.And, the cold-rolled steel sheet of gained is implemented leveling with the extensibility shown in the table 2 handles.
After cold rolling, the plate surface hardness (HR30T) of the cold-rolled steel sheet before the leveling processing and the hardness change of plate width direction are studied, the result is as shown in table 3.
In addition, also show the result that the ratio (%) of the average hardness of the steel plate of trying to achieve as stated above and hardness change≤± 2 is studied in the table 3, and the measurement result of the hardness of the position of the wide 5mm of plate that measures in the central authorities of length direction and the wide middle position of plate.In addition,, also obtained the average hardness of steel plate and the ratio of hardness change, demonstrated the result consistent with the result of table 3 for from the long steel plate (cutting plate) of the 1500mm of the centric acquisition of length direction.
In addition, to the steel plate after the leveling processing, planeness and intensity (YS) have been studied.
The result who obtains remembers in table 3 in the lump.In addition, planeness is tried to achieve as stated above, and test materials uses the steel plate of the wide 1000mm of plate, long 1500mm.In addition, yield strength (YS) is used with draw direction and is obtained as No. 5 test films of JIS of extension direction.
Table 1
Ar
3Transformation temperature=901-325[%C]-92[%Mn]+33[%S]+287[%P]
Table 2
Table 3
Can clearly learn by table 3, cold-rolled steel sheet constructed in accordance, plate surface hardness after cold rolling all satisfies preferable range of the present invention, and, leveling is handled the steel plate that front plane surface hardness satisfies prerequisite of the present invention, after handling through suitable leveling, edge wave, middle cardiac wave all below 2mm, all planeness that can obtain expecting among the present invention and intensity.
Claims (4)
1. ultra-thin cold-rolled steel sheet for building material, it is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities, and be cold-rolled to below the thickness of slab 0.2mm, described steel plate is characterised in that, the average hardness HR30T of the steel plate after this is cold rolling is more than 68, below 83, and the hardness change of plate width direction average hardness ± 2 account for more than 90% of steel plate integral body with interior ratio.
2. ultra-thin cold-rolled steel sheet for building material is implemented shape correction to the described steel plate of claim 1 and is handled and obtain, and it is characterized in that the planeness of this steel plate is below 2mm, and yield strength YS is more than 700MPa.
3. the manufacture method of a ultra-thin cold-rolled steel sheet for building material, it is characterized in that, with the former material of steel be heated to Heating temperature more than 1150 ℃ after, in finishing temperature is more than 700 ℃, implement hot rolling under the condition below the Ar3 point, be more than 500 ℃ at coiling temperature then, batch rolling below 750 ℃, make hot-rolled sheet, then with after this hot-rolled sheet pickling, in the cold rolling rate is more than 85%, be cold-rolled under the condition below 99% below the thickness of slab 0.2mm, wherein, the former material of described steel is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities.
4. the manufacture method of a ultra-thin cold-rolled steel sheet for building material is characterized in that, with the former material of steel be heated to Heating temperature more than 1150 ℃ after, in finishing temperature be more than 700 ℃, Ar
3Implement hot rolling under the condition below the point, be more than 500 ℃ at coiling temperature then, batch rolling below 750 ℃, make hot-rolled sheet, then with after this hot-rolled sheet pickling, in the cold rolling rate is more than 85%, be cold-rolled under the condition below 99% below the thickness of slab 0.2mm, and then implement shape correction and handle, wherein, the former material of described steel is in quality %, contain C:0.01% above and 0.10% below, below the Si:0.03%, more than the Mn:0.005% and below 0.5%, more than the P:0.01% and below 0.20%, below the S:0.03%, more than the Al:0.01% and below 0.1%, below the N:0.010%, surplus is made of Fe and unavoidable impurities.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410064767.0A CN103898402B (en) | 2007-03-30 | 2008-03-19 | Ultra-thin cold-rolled steel sheet for building material and process for production of the same |
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|---|---|---|---|
| JP2007094650 | 2007-03-30 | ||
| JP094650/2007 | 2007-03-30 |
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| CN201410064767.0A Division CN103898402B (en) | 2007-03-30 | 2008-03-19 | Ultra-thin cold-rolled steel sheet for building material and process for production of the same |
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| CN101646796A true CN101646796A (en) | 2010-02-10 |
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| CN201410064767.0A Active CN103898402B (en) | 2007-03-30 | 2008-03-19 | Ultra-thin cold-rolled steel sheet for building material and process for production of the same |
| CN200880010685A Pending CN101646796A (en) | 2007-03-30 | 2008-03-19 | Ultra-thin cold-rolled steel sheet for building material and process for production of the same |
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| Country | Link |
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| JP (1) | JP5176599B2 (en) |
| CN (2) | CN103898402B (en) |
| MY (1) | MY158266A (en) |
| WO (1) | WO2008123336A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296231A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for producing 0.25-0.35mm super-bright cold-rolled sheet by continuous annealing unit |
| CN102822375A (en) * | 2010-03-24 | 2012-12-12 | 杰富意钢铁株式会社 | Ultra high strength cold rolled steel sheet and method for producing same |
| CN114635088A (en) * | 2022-03-21 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Cold-rolled sheet for household appliance panel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102065224B1 (en) * | 2017-12-22 | 2020-01-10 | 주식회사 포스코 | Solution composition for surface treating of steel sheet, steel sheet using the same, and manufacturing method of the same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0441620A (en) * | 1990-06-06 | 1992-02-12 | Sumitomo Metal Ind Ltd | Production of high strength hot-dip galvanized steel sheet |
| JP3474647B2 (en) * | 1994-09-29 | 2003-12-08 | 新日本製鐵株式会社 | Manufacturing method of steel sheet for thin containers |
| EP0826436A4 (en) * | 1996-03-15 | 2003-04-16 | Kawasaki Steel Co | Ultra-thin sheet steel and method for manufacturing the same |
| JPH10130781A (en) * | 1996-10-23 | 1998-05-19 | Nippon Steel Corp | Hot dip galvanized steel sheet |
| JPH10140237A (en) * | 1996-11-08 | 1998-05-26 | Nisshin Steel Co Ltd | Production of cold rolled steel sheet and hot-dip metal coated cold rolled steel sheet for building material, excellent in fire resistance |
| JPH11236657A (en) * | 1998-02-24 | 1999-08-31 | Nisshin Steel Co Ltd | Production of plated steel strip for structural purpose |
| JP4234932B2 (en) * | 2002-02-13 | 2009-03-04 | 新日本製鐵株式会社 | Steel plate for containers having excellent formability and weld properties and method for producing the same |
-
2008
- 2008-02-29 JP JP2008050920A patent/JP5176599B2/en not_active Expired - Fee Related
- 2008-03-19 WO PCT/JP2008/055817 patent/WO2008123336A1/en active Application Filing
- 2008-03-19 MY MYPI20093708A patent/MY158266A/en unknown
- 2008-03-19 CN CN201410064767.0A patent/CN103898402B/en active Active
- 2008-03-19 CN CN200880010685A patent/CN101646796A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102822375A (en) * | 2010-03-24 | 2012-12-12 | 杰富意钢铁株式会社 | Ultra high strength cold rolled steel sheet and method for producing same |
| CN102822375B (en) * | 2010-03-24 | 2014-05-28 | 杰富意钢铁株式会社 | Ultra high strength cold rolled steel sheet and method for producing same |
| CN102296231A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for producing 0.25-0.35mm super-bright cold-rolled sheet by continuous annealing unit |
| CN102296231B (en) * | 2010-06-25 | 2013-05-01 | 鞍钢股份有限公司 | Method for producing 0.25-0.35mm super-bright cold-rolled sheet by continuous annealing unit |
| CN114635088A (en) * | 2022-03-21 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Cold-rolled sheet for household appliance panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103898402B (en) | 2017-04-12 |
| JP2008274407A (en) | 2008-11-13 |
| JP5176599B2 (en) | 2013-04-03 |
| WO2008123336A1 (en) | 2008-10-16 |
| CN103898402A (en) | 2014-07-02 |
| MY158266A (en) | 2016-09-30 |
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Application publication date: 20100210 |