WO2000006791A1 - Tole d'acier mince a base de ferrite presentant une excellente caracteristique de prise de forme, et son procede de fabrication - Google Patents
Tole d'acier mince a base de ferrite presentant une excellente caracteristique de prise de forme, et son procede de fabrication Download PDFInfo
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- WO2000006791A1 WO2000006791A1 PCT/JP1999/004029 JP9904029W WO0006791A1 WO 2000006791 A1 WO2000006791 A1 WO 2000006791A1 JP 9904029 W JP9904029 W JP 9904029W WO 0006791 A1 WO0006791 A1 WO 0006791A1
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- shape freezing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Definitions
- the present invention relates to a thin steel sheet (hereinafter simply referred to as a steel sheet or a thin steel sheet) which is used for processing parts of automobiles and has excellent shape freezing property mainly in bending due to the development of ⁇ 100 ⁇ texture. ) And its manufacturing method.
- a thin steel sheet hereinafter simply referred to as a steel sheet or a thin steel sheet
- Japanese Patent Application Laid-Open No. Hei 10-72644 discloses an austenitic stainless cold-rolled steel sheet having a small springback amount, characterized in that the degree of accumulation of ⁇ 200 ⁇ texture in a plane parallel to the rolling plane is 1.5 or more. It has been disclosed.
- the above austenitic stainless steel cold-rolled steel sheets are as follows: C: 0.01 to 0.1 wt%, Si: 0.05 to 3.0 wt%, Mn: 0.05 to 2.0 wt%, P: 0.04 wt% J3 ⁇ 4, S: 0.03 wt% Under J3 ⁇ 4, Al: 0.1wt% or less, Cr: 15 ⁇ 25wt%, Ni: 5 ⁇ 15wt%, N: 0.005 ⁇ 0.3wt%, 0: 0.007wt% or less, the balance being Fe and inevitable impurities
- REM 0.001-0.1 wt%, Y: 0.001-0.5 wt%, B: 0.0003-0.01 wt%, and Ca: 0.0003-0.
- Olwt% A continuous structure slab containing at least one kind or two or more kinds and the balance is composed of Fe and unavoidable impurities and having an equiaxed crystallinity of 30% or more, after heating, hot rough rolling, and then the final pass, Hot finish rolling at a temperature of 1050 ° C or more and a reduction of 15% or more, and further hot-rolled sheet annealing as appropriate, followed by cold rolling and finish annealing to reduce the crystal grain size It is manufactured without increasing the size.
- the austenitic stainless cold-rolled steel sheet is used not for machined parts of automobiles but for press-formed articles such as bathtubs, pots, dishes, sinks, and the like.
- Japanese Patent Application Laid-Open No. 10-72644 does not disclose reducing the amount of springback in a ferritic steel sheet. Disclosure of the invention
- the present invention solves this problem fundamentally advantageously and provides a thin steel sheet excellent in shape freezing property and a method for producing the same.
- the present inventors newly focused on the effect of the texture of the steel sheet on the bending workability in order to improve the bending workability and fundamentally solve the occurrence of the springing 'back.
- the effects were investigated and studied in detail. They also tried to find an appropriate material index corresponding to the bending workability of the steel sheet. As a result, it was clarified that the bendability of the steel sheet was improved when the ratio of the ⁇ 100 ⁇ plane parallel to the sheet surface and the ⁇ 111 ⁇ plane was 1.0 or more in the texture of the steel sheet. did.
- the amount of crystal planes parallel to the plane of the thin steel sheet is assumed to be proportional to the amount of X-ray diffraction, and the diffraction intensity of X-rays such as ⁇ 200 ⁇ and ⁇ 222 ⁇ is determined. Determined by measuring. Therefore, the diffraction intensities of X-rays such as ⁇ 200 ⁇ and ⁇ 222 ⁇ correspond to the abundance of ⁇ 100 ⁇ and ⁇ 111 ⁇ planes, respectively. Needless to say, the X-ray diffraction intensity ratio ⁇ 200 ⁇ / ⁇ 222 ⁇ may be equivalent to the diffraction intensity ratio (100 ⁇ / ⁇ 111 ⁇ of the existing crystal plane.
- the present invention has been made based on the above findings, and the ferritic thin steel sheet of the present invention has the following points (1) to (10).
- Si 0.01% or more, 1.0% or less
- Mn 0.01% or more, 2.0% or less
- A1 0.01% or more, 0.1% or less
- Ferrite system with excellent shape freezing characteristics characterized by containing iron and unavoidable impurities and having a ratio of ⁇ 100 ⁇ and ⁇ 111 ⁇ planes parallel to the plate surface of 1.0 or more.
- Sheet steel
- Si 0.01% or more, 1.0% or less
- Mn 0.01% or more, 2.0% or less
- Al 0.01% or more, 0.1% or less
- Ti 0.2% or less, Nb: 0.2% or less and B: 0.005% or less,
- Containing iron and unavoidable impurities Containing iron and unavoidable impurities, and having a ratio of the ⁇ 100 ⁇ plane and the ⁇ 111 ⁇ plane parallel to the plate surface of 1.0 or more, and having excellent shape freezing characteristics.
- Elite thin steel sheet Containing iron and unavoidable impurities, and having a ratio of the ⁇ 100 ⁇ plane and the ⁇ 111 ⁇ plane parallel to the plate surface of 1.0 or more, and having excellent shape freezing characteristics.
- Si 0.01% or more, 1.0% or less
- Mn 0.01% or more, 2.0% or less
- A1 0.01% or more, 0.1% or less
- Containing iron and unavoidable impurities Containing iron and unavoidable impurities, and having a ratio of the ⁇ 100 ⁇ plane and the ⁇ 111 ⁇ plane parallel to the plate surface of 1.0 or more, and having excellent shape freezing characteristics.
- Light steel sheet Containing iron and unavoidable impurities, and having a ratio of the ⁇ 100 ⁇ plane and the ⁇ 111 ⁇ plane parallel to the plate surface of 1.0 or more, and having excellent shape freezing characteristics.
- Mn 0.01% or more, 2.0% or less
- Ti 0.2% or less,: 0.2% or less and 8: 0.005% or less, one or more types, and
- Si 0.01% or more, 2.5% or less
- Mn 0.01% or more, 2.5% or less
- A1 0.01% or more, 1.0% or less
- Si 0.01% or more, 2.5% or less
- n 0.01% or more, 2.5% or less
- A1 0.01% or more, 1.0% or less
- Ti 0.2% or less, Nb: 0.2% or less, V: 0.2% or less, Cr: 1.0% or less, and B: 0.005% or less
- Si 0.01% or more, 2.5% or less
- Mn 0.01% or more, 2.5% or less
- A1 0.01% or more, 1.0% or less
- Mo 1.0% or less
- Cu 2.0% or less
- Ni 1.0% or less one or more
- Ferrite with excellent shape freezing characteristics characterized by containing iron and inevitable impurities, and having a ratio of ⁇ 100 ⁇ and ⁇ 111 ⁇ planes parallel to the plate surface of 1.0 or more.
- U-based thin steel sheet U-based thin steel sheet.
- Si 0.01% or more, 2.5% or less
- Mn 0.01% or more, 2.5% or less
- A1 0.01% or more, 1.0% or less
- Mo 1.0% or less
- Ni 1.0% or less
- the gist of the method for producing a thin steel sheet of the present invention is as follows (11) to (18).
- the steel having a predetermined component composition may be prepared at a temperature of 950 ° C or lower in hot rolling above the Ar 3 transformation temperature In total rolling reduction 25% or more, and, 9 5 0 ° Contact Keru friction coefficient for hot rolling at C or less so as to become 0.2 or less hot rolled in, A r 3 transformation temperature or higher
- Mneq Mn% + 0.5 x N i%-1.49 x S i%- 1.05 x Mo%-0.44 x W% + 0.37 x Cr% + 0.67 x Cu%-23 x P% + l 3 x A l%
- a steel having a predetermined component composition is heated to a temperature of 950 ° C or lower and an Ar 3 transformation temperature or higher.
- Hot rolling at a total rolling reduction of 25% or more in hot rolling and a friction coefficient of 0.2 or less in hot rolling at 950 ° C. or less, and the Ar 3 transformation
- the hot rolling is completed at a temperature higher than the temperature, and after cooling, it is wound at a temperature not higher than the critical temperature To determined by the following formula, and furthermore, the sheet surface is polished. Manufacturing method of ferrite thin steel sheet.
- M n eq M n% + 0.5 x N i%-1.49 x S i%- 1. 0 5 ⁇ ⁇ %-0.44 x W% + 0.37 x Cr% + 0.67 x Cu%-23 x P% + l 3 x A l%
- a steel having a predetermined component composition is subjected to an Ar 3 transformation temperature.
- Hot rolling is performed so that the total rolling reduction in the following hot rolling is 25% or more, and the friction coefficient in the hot rolling at the Ar 3 transformation temperature or less is 0.2 or less, and winding after cooling Or recovery or recrystallization after cooling. Manufacturing method of ferrite thin steel sheet with excellent shape freezing property.
- a steel having a predetermined component composition is subjected to a temperature of 950 ° C or lower and an Ar 3 transformation temperature or higher.
- a method for producing a ferritic thin steel sheet having excellent shape freezing properties wherein the ferrite thin steel sheet is heated to a temperature less than, then cooled, and further subjected to plating.
- a steel having a predetermined composition is prepared by reducing a reduction ratio in hot rolling at a temperature not higher than an Ar 3 transformation temperature. Is hot rolled so that the friction coefficient in hot rolling at a temperature of not less than 25% and Ar 3 transformation temperature is not more than 0.2, and then cooling, and after cooling, winding or even properly, additionally performs recovery and recrystallization treatment after cooling, then pickled and cold rolled at a reduction ratio less than 8 0%, then less than 6 0 0 ° C over Ac 3 transformation temperature
- a method for producing a thin steel sheet having excellent shape freezing properties which comprises heating, then cooling, and plating the sheet surface.
- Figure 1 is a diagram showing the relationship between the tensile strength of a cold-rolled steel sheet and the amount of springing back.
- FIG. 2 is a diagram showing the relationship between the X-ray diffraction intensity ratio ⁇ 200 ⁇ / (222 ⁇ of a 590 MPa class cold-rolled steel sheet and the amount of spring back.
- FIG. 3 is a diagram showing the relationship between the tensile strength of a cold-rolled steel sheet and the effect of the X-ray diffraction intensity ratio (200) / ⁇ 222 ⁇ on the amount of springing and backing of the cold-rolled steel sheet.
- the basis of the present invention is that the bending workability of a thin steel sheet is significantly improved if the ratio of the ⁇ 100 ⁇ plane and the ⁇ 111 ⁇ plane parallel to the sheet surface of the thin steel sheet is 1.0 or more.
- the reason for limiting this abundance ratio is as follows. First, the reason why the abundance ratio between the ⁇ 100 ⁇ and ⁇ 111 ⁇ planes is limited to 1.0 or more is that if this ratio is smaller than 1.0, the springing / backing amount when bending a thin steel plate is extremely large. It is because it becomes worse. The reason why the spring-back amount becomes very small when the crystal plane abundance is 1.0 or more is considered to be because plastic deformation in the steel sheet during bending is extremely smooth.
- the ratio is 1.0 or more, the bending workability of the thin steel sheet is greatly improved.
- the abundance ratio is a basic material index relating to bending workability, which exceeds the constraint on the strength level of the thin steel sheet.
- the effect of the present invention can be obtained if the abundance ratio of the ⁇ 100 ⁇ plane and the (111) plane parallel to the sheet surface of the thin steel sheet is 1.0 or more.
- the abundance ratio is preferably 1.5 or more.
- the component system of the thin steel sheet described in (2) to (9) is an ultra-low carbon steel sheet, a so-called IF (interstitial free) steel sheet in which solid solution carbon and nitrogen are fixed with Ti and Nb, and a low carbon steel sheet.
- IF internal free
- the component system of the thin steel sheet described in (2) above is mainly intended for ultra-low carbon steel sheets, low carbon steel sheets, and solid solution reinforced high strength steel sheets.
- the component system of the ferritic steel sheet described in (3) is It mainly targets IF steel sheets and precipitation-strengthened high-strength steel sheets.
- the component system of the ferrite thin steel sheet described in (6) above is mainly intended for a solid solution reinforced high strength steel sheet and a transformation structure reinforced high strength steel sheet.
- the component system of the ferritic thin steel sheet described in (7) above relates to a steel sheet that combines the use of a precipitation strengthening mechanism with a solid solution reinforced high strength steel sheet and a transformation structure reinforced high strength steel sheet.
- the lower limit of C was set to 0.0001% because the lower limit of the amount of C obtained in practical steel was used. If the upper limit is more than 0.05%, workability deteriorates, so set this value.
- Si and Mn are deoxidizing elements and must be contained at 0.01% or more, respectively.However, the upper limit is limited to 1.0% or less and 2.0% or less, respectively. To do that.
- P and S are set to 0.15% or less and 0.03% or less, respectively, also in order to prevent deterioration of workability.
- A1 is added in an amount of 0.01% or more for deoxidation, but if it is too much, the processability is reduced. Therefore, the upper limit is set to 0.1%.
- N and 0 are impurities, and are set to 0.01% or less and 0.007% or less, respectively, so as not to deteriorate workability.
- Ti, Nb, and B improve their materials through mechanisms such as carbon and nitrogen fixation, precipitation strengthening, and fine grain strengthening, it is desirable to add at least 0.005%, 0.001%, and 0.0001%, respectively. Excessive addition deteriorates processability, so the upper limits are set to 0.2%, 0.2%, and 0.005%, respectively.
- Mo, Cu, and Ni should be added at 0.001%, 0.001%, and 0.001% or more in order to secure the strength, but excessive addition deteriorates workability. , And set the upper limit to 1.0%, 2.0%, and 1.0%, respectively.
- the lower limit of C was set to 0.05% because the lower limit of the amount of C in practical high-strength steel sheets was used. If the upper limit exceeds 0.25%, workability and weldability deteriorate, so set this value.
- Si and Mn are deoxidizing elements, each of which must be contained at 0.01% or more, but the upper limits are both set at 2.5% because if it exceeds this, workability deteriorates.
- P and S are set to 0.15% or less and 0.03% or less, respectively, also in order to prevent deterioration of workability.
- A1 is added in an amount of 0.01% or more for deoxidation and material control. However, if the content is too large, the surface properties deteriorate, so the upper limit is set to 1.0%.
- N and 0 are impurities, and are set to 0.01% or less and 0.007% or less, respectively, so as not to deteriorate workability.
- Ti, Nb, V, Cr, and B improve the material through mechanisms such as fixation of carbon and nitrogen, precipitation strengthening, microstructure control, and fine grain strengthening.Therefore, 0.055%, 0.001%, 0.001%, 0.01%, It is desirable to add 0.0001% or more, but excessive addition deteriorates workability, so the upper limits are set to 0.2%, 0.2%, 0.2%, 1.0%, and 0.005%, respectively.
- Mo, Cu, and Ni are preferably added in amounts of 0.001%, 0.001%, and 0.001% or more in order to secure the strength.
- the upper limits are 1.0%, 2.0%, and 1.0%, respectively.
- the type of plating for the ferritic thin steel sheet described in (10) is not particularly limited, and the effects of the present invention can be obtained by any of electroplating, melting plating, and vapor deposition plating. .
- the steel sheet according to the present invention is not only bent, but also bent and overhanged.
- the present invention is also applicable to forming mainly by bending, such as drawing. Next, a method for producing a thin steel sheet excellent in shape freezing property according to the present invention will be described.
- the production method of the present invention comprises the steps of: producing a steel having the above component composition; 1) rolling at a predetermined temperature after hot rolling; 2) cooling after hot rolling; or heat-treating after cooling. Or (3) after hot rolling in (1) or (2), cooling, pickling, cold rolling, and annealing, and (4) hot rolling obtained in (1) or (2) above.
- the basic process is to heat-treat the steel sheet or the cold-rolled steel sheet obtained in (3) above with a fusion plating line.
- a step of separately performing surface treatment on these steel sheets may be added.
- the total draft is desirably set to 97.5% or less.
- the hot-rolled hole during hot rolling at 950 ° C or lower and the Ar 3 transformation temperature or higher If the friction coefficient between the steel and the steel plate exceeds 0.2, the diffraction intensity ratio of X-rays from the crystal plane parallel to the plate surface near the steel plate surface ⁇ 200 ⁇ / ⁇ 222 ⁇ is 1.0 or more.
- the shape freezing property of the steel sheet deteriorates. Therefore, a coefficient of friction of 0.2 was set as the upper limit of the coefficient of friction between the hot-rolled roll and the steel sheet during hot rolling at 950 ° C or lower and Ar 3 transformation temperature or higher. The lower the friction coefficient is, the more desirable it is. Particularly, when severe shape freezing is required, the friction coefficient is desirably 0.15 or less.
- T o the upper limit of the winding temperature
- This T o temperature is thermodynamically defined as the temperature at which austenite and a filament having the same component composition as austenite have the same free energy. 1) It can be easily calculated using Eq. The effect on the T0 temperature by components other than the components specified in the present invention was not so great, and was ignored here.
- B is determined by the composition of the steel (% by weight) and is defined as follows.
- Mneq Mn% + 0.5 xNi%-1.49x Si%-1.05x Mo% -0.44x W%
- the high-temperature processed fly may be wound up during cooling or may be cooled once. It will be necessary to recover and recrystallize after heating again.
- the sheet surface can be rolled at the recrystallization temperature or higher, or cooled and reheated for recovery and recrystallization.
- the coefficient of friction between the hot-rolled roll and the steel sheet during hot rolling exceeds 0.2, the diffraction intensity ratio of the X-ray from the crystal plane parallel to the sheet surface near the steel sheet surface ⁇ 200 ⁇ / ⁇ 222) does not exceed 1.0. Therefore, 0.2 was set as the upper limit of the coefficient of friction between the hot-rolled roll and the steel sheet during hot rolling at the Ar 3 transformation temperature or lower. The lower the coefficient of friction is, the more desirable it is. In particular, when severe shape freezing is required, the coefficient of friction is desirably 0.15 or less.
- the total rolling reduction of the cold-rolled steel sheet is 80%. % Or more, the ⁇ 222 ⁇ plane component in the X-ray diffraction integral plane intensity ratio of the crystal plane parallel to the plane becomes high in the plane of the general cold rolling—recrystallization texture,
- the ratio of ⁇ 200 ⁇ / ⁇ 222 ⁇ , which is a feature of the present invention, is less than 1.0. Therefore, the upper limit of the total rolling reduction in cold rolling was set to less than 80%. In order to further enhance the shape connectivity of the steel sheet, it is desirable to limit the above total rolling reduction to 70% or less.
- the lower limit of the annealing temperature is set to 600 ° C.
- the annealing temperature is excessively high, the texture of ferrite formed by recrystallization is transformed into austenite, and the austenite grains The growth is randomized, and the texture of the finally obtained light is also randomized.
- the annealing temperature is higher than the transformation temperature of Ac 3 , the final ratio of ⁇ 200 ⁇ / ⁇ 222 ⁇ will not exceed 1.0. Therefore, the upper limit of the annealing temperature is less than Ac 3 transformation temperature o
- FIG. 2 shows an example of the results. This is the result of a survey on 590MPa grade H steel. As is clear from Fig. 2, the springing / backing amount decreases as the diffraction intensity ratio of X-rays ⁇ 200 ⁇ / ⁇ 222 ⁇ from the crystal plane parallel to the plate surface increases. In particular, it can be seen that the effect increases when the ratio exceeds 1.0. In the present invention, it has been newly found that there is a very basic and universal crystallographic relationship between the texture and the amount of springing back.
- Figure 3 shows the results of fractionating the amount of spring back of the various cold-rolled steel sheets shown in Fig.
- the image relates to a steel plate with ⁇ 200 ⁇ / ⁇ 222 ⁇ smaller than 1.0
- ⁇ relates to a steel plate with ⁇ 200 ⁇ / ⁇ 222 ⁇ of 1.0 or more.
- Table 2 shows the mechanical property values and the amount of springback of the 1.4-imn hot-rolled steel sheet and cold-rolled steel sheet manufactured by the above method
- Table 3 shows the production of each steel sheet. It was shown whether the conditions were within the scope of the present invention.
- hot rolling temperature 1 when the hot rolling Ryosuru completed at Ar 3 transformation temperature or more, the sum of the definitive reduction ratio in hot rolling at 950 ° C or less Ar 3 transformation temperature or higher 25 If it is not less than%, it was marked as “ ⁇ ”.
- ⁇ Hot rolling temperature 2 '' is ⁇ ⁇ '' when hot rolling is at or below the Ar 3 transformation temperature and when the total rolling reduction at or below the Ar 3 transformation temperature is 25% or more. did.
- Heat treatment was performed at 700 to 850 ° C for a short time, and then additional heat treatment with controlled cooling conditions was performed.
- the spring 'back amount is smaller than in the case of the non-inventive steel type in which this ratio is less than 1.0. You can see that there is. That is, X-ray diffraction intensity ratio ⁇
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99931572.4A EP1026278B2 (en) | 1998-07-27 | 1999-07-27 | Use of a ferritic steel sheet having excellent shape fixability and manufacturing method thereof |
DE69939099T DE69939099D1 (de) | 1998-07-27 | 1999-07-27 | Verwendung eines ferritischen stahlbleches mit hervorragendem beibehalten der form und herstellungsverfahren dafür |
US09/509,278 US6375765B1 (en) | 1998-07-27 | 1999-07-27 | Ferrite-based thin steel sheet excellent in shape freezing feature and manufacturing method thereof |
JP2000562571A JP4157279B2 (ja) | 1998-07-27 | 1999-07-27 | 形状凍結性に優れたフェライト系薄鋼板 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP10/225176 | 1998-07-27 | ||
JP22517698 | 1998-07-27 |
Publications (1)
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WO2000006791A1 true WO2000006791A1 (fr) | 2000-02-10 |
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PCT/JP1999/004029 WO2000006791A1 (fr) | 1998-07-27 | 1999-07-27 | Tole d'acier mince a base de ferrite presentant une excellente caracteristique de prise de forme, et son procede de fabrication |
Country Status (6)
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US (1) | US6375765B1 (ja) |
EP (1) | EP1026278B2 (ja) |
JP (2) | JP4157279B2 (ja) |
KR (1) | KR100398464B1 (ja) |
DE (1) | DE69939099D1 (ja) |
WO (1) | WO2000006791A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2006080670A1 (en) * | 2004-09-30 | 2006-08-03 | Posco | High strength cold rolled steel sheet having excellent shape freezability, and method for manufacturing the same |
WO2010010964A1 (ja) | 2008-07-22 | 2010-01-28 | Jfeスチール株式会社 | 冷延鋼板及びその製造方法並びにバックライトシャーシ |
WO2010125848A1 (ja) | 2009-04-28 | 2010-11-04 | Jfeスチール株式会社 | 成形性、形状凍結性、表面外観に優れた冷延鋼板、およびその製造方法 |
WO2011087108A1 (ja) * | 2010-01-15 | 2011-07-21 | Jfeスチール株式会社 | 成形性と形状凍結性に優れた冷延鋼板およびその製造方法 |
WO2014057519A1 (ja) | 2012-10-11 | 2014-04-17 | Jfeスチール株式会社 | 形状凍結性に優れた冷延鋼板およびその製造方法 |
WO2015002190A1 (ja) * | 2013-07-01 | 2015-01-08 | 新日鐵住金株式会社 | 冷延鋼板、亜鉛めっき冷延鋼板及びそれらの製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US6962631B2 (en) * | 2000-09-21 | 2005-11-08 | Nippon Steel Corporation | Steel plate excellent in shape freezing property and method for production thereof |
JP3927384B2 (ja) * | 2001-02-23 | 2007-06-06 | 新日本製鐵株式会社 | 切り欠き疲労強度に優れる自動車用薄鋼板およびその製造方法 |
DE60224557T4 (de) * | 2001-10-04 | 2015-06-25 | Nippon Steel & Sumitomo Metal Corporation | Ziehbares hochfestes dünnes Stahlblech mit hervorragender Formfixierungseigenschaft und Herstellungsverfahren dafür |
KR101019791B1 (ko) * | 2002-12-24 | 2011-03-04 | 신닛뽄세이테쯔 카부시키카이샤 | 용접 열영향부의 내연화성과 버링성이 우수한 고강도 강판 |
KR101406561B1 (ko) * | 2012-12-20 | 2014-06-27 | 주식회사 포스코 | 충격인성이 우수한 고강도 열연강판 및 그 제조방법 |
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JPH0734191A (ja) * | 1993-07-14 | 1995-02-03 | Kawasaki Steel Corp | 深絞り性及び化成処理性に優れた高強度冷延鋼板 |
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1999
- 1999-07-27 EP EP99931572.4A patent/EP1026278B2/en not_active Expired - Lifetime
- 1999-07-27 WO PCT/JP1999/004029 patent/WO2000006791A1/ja active IP Right Grant
- 1999-07-27 US US09/509,278 patent/US6375765B1/en not_active Expired - Lifetime
- 1999-07-27 KR KR10-2000-7003276A patent/KR100398464B1/ko not_active IP Right Cessation
- 1999-07-27 JP JP2000562571A patent/JP4157279B2/ja not_active Expired - Fee Related
- 1999-07-27 DE DE69939099T patent/DE69939099D1/de not_active Expired - Lifetime
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2008
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JPH0734191A (ja) * | 1993-07-14 | 1995-02-03 | Kawasaki Steel Corp | 深絞り性及び化成処理性に優れた高強度冷延鋼板 |
JPH09272952A (ja) * | 1996-04-09 | 1997-10-21 | Nippon Steel Corp | 疲労特性と深絞り性に優れた冷延鋼板およびその製造方法 |
Cited By (12)
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WO2006080670A1 (en) * | 2004-09-30 | 2006-08-03 | Posco | High strength cold rolled steel sheet having excellent shape freezability, and method for manufacturing the same |
WO2010010964A1 (ja) | 2008-07-22 | 2010-01-28 | Jfeスチール株式会社 | 冷延鋼板及びその製造方法並びにバックライトシャーシ |
US8449699B2 (en) | 2008-07-22 | 2013-05-28 | Jfe Steel Corporation | Cold-rolled steel sheet, method for manufacturing the same, and backlight chassis |
WO2010125848A1 (ja) | 2009-04-28 | 2010-11-04 | Jfeスチール株式会社 | 成形性、形状凍結性、表面外観に優れた冷延鋼板、およびその製造方法 |
WO2011087108A1 (ja) * | 2010-01-15 | 2011-07-21 | Jfeスチール株式会社 | 成形性と形状凍結性に優れた冷延鋼板およびその製造方法 |
JP2011144430A (ja) * | 2010-01-15 | 2011-07-28 | Jfe Steel Corp | 成形性と形状凍結性に優れた冷延鋼板およびその製造方法 |
TWI427162B (zh) * | 2010-01-15 | 2014-02-21 | Jfe Steel Corp | 成形性和形狀凍結性優異之冷軋鋼板及其製造方法 |
KR101464845B1 (ko) * | 2010-01-15 | 2014-11-25 | 제이에프이 스틸 가부시키가이샤 | 성형성과 형상 동결성이 우수한 냉연 강판 및 그의 제조 방법 |
WO2014057519A1 (ja) | 2012-10-11 | 2014-04-17 | Jfeスチール株式会社 | 形状凍結性に優れた冷延鋼板およびその製造方法 |
WO2015002190A1 (ja) * | 2013-07-01 | 2015-01-08 | 新日鐵住金株式会社 | 冷延鋼板、亜鉛めっき冷延鋼板及びそれらの製造方法 |
JPWO2015002190A1 (ja) * | 2013-07-01 | 2017-02-23 | 新日鐵住金株式会社 | 冷延鋼板、亜鉛めっき冷延鋼板及びそれらの製造方法 |
US9970074B2 (en) | 2013-07-01 | 2018-05-15 | Nippon Steel & Sumitomo Metal Corporation | Cold-rolled steel sheet, galvanized cold-rolled steel sheet and method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
EP1026278B1 (en) | 2008-07-16 |
EP1026278B2 (en) | 2014-04-30 |
JP4157279B2 (ja) | 2008-10-01 |
KR20010030741A (ko) | 2001-04-16 |
JP5015063B2 (ja) | 2012-08-29 |
EP1026278A4 (en) | 2006-04-19 |
DE69939099D1 (de) | 2008-08-28 |
EP1026278A1 (en) | 2000-08-09 |
JP2008255491A (ja) | 2008-10-23 |
KR100398464B1 (ko) | 2003-10-10 |
US6375765B1 (en) | 2002-04-23 |
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