US20050011246A1 - Method for improving dent-resistance of a steel plate - Google Patents
Method for improving dent-resistance of a steel plate Download PDFInfo
- Publication number
- US20050011246A1 US20050011246A1 US10/751,028 US75102803A US2005011246A1 US 20050011246 A1 US20050011246 A1 US 20050011246A1 US 75102803 A US75102803 A US 75102803A US 2005011246 A1 US2005011246 A1 US 2005011246A1
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- steel plate
- dent
- outer panel
- enhancing
- present
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- 238000000034 method Methods 0.000 title claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 230000002708 enhancing effect Effects 0.000 claims abstract description 15
- 239000010960 cold rolled steel Substances 0.000 claims description 5
- 238000005482 strain hardening Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 20
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 230000001965 increasing effect Effects 0.000 description 18
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- JAKVEOCMEMGHGB-YFKPBYRVSA-N (2r)-2-azaniumyl-3-prop-2-ynylsulfanylpropanoate Chemical compound OC(=O)[C@@H](N)CSCC#C JAKVEOCMEMGHGB-YFKPBYRVSA-N 0.000 description 2
- 101100150143 Homo sapiens SPRR3 gene Proteins 0.000 description 2
- 102100038979 Small proline-rich protein 3 Human genes 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001268 conjugating effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
Definitions
- the present invention relates to a method for improving dent-resistance of a steel plate by prestraining the steel plate through a skin pass mill process where a certain reduction rate is provided.
- an outer panel of a vehicle requires improved processability for fabricating a certain part into a desired shape after a press forming process.
- the outer panel may also require an improved dent-resistant property.
- An outer panel of a vehicle body is generally made of a cold-rolled steel plate having a high elongation rate and a large plastic deformation rate.
- a high yield strength as well as excellent processability for fabricating an outer panel such as a door, a hood, a panel, etc. may be desirable.
- yield strength of a steel plate is low, the steel plate can be easily dented even when slightly pressed by hands or other external forces.
- a dent may indicate that a certain defect occurred on a surface of an outer panel due to the above reasons.
- the property of limiting a dent is referred to as dent-resistance.
- a steel plate should generally have high yield strength to enhance dent resistance of an outer panel of a vehicle.
- yield strength of a steel plate is too high, a process defect may occur during a forming process before the steel plate is formed.
- a spring-back phenomenon may occur after the forming process. It may therefore become challenging to fabricate a certain part in a desired shape.
- Methods for enhancing yield strength of an outer panel of a vehicle body, to enhance dent-resistance of an outer panel of a vehicle body are known from the related art. For instance, methods such as a method of improving the amount of components of a steel plate, a method of using a combined material fabricated by mixing heterogeneous materials with each other, and a method achieved by combining both the above methods are known.
- a dual-skin steel plate formed of an inner steel panel and a surface steel plate with a different amount of steel for enhancing dent-resistance, a fatigue property, a surface deformation resistance and a processability.
- a core plate of aluminum or an aluminum alloy there is provided a core plate of aluminum or an aluminum alloy.
- a construction for enhancing the entire dent-resistance is provided by conjugating a low carbon steel plate to both surfaces of the core plate.
- a steel having a ferrite-martensite is provided on a surface of the construction, and a cold-rolled steel plate having a soft steel tissue is provided in an inner side of the construction.
- a surface defect called as a stretcher strain may occur on a surface of a steel plate, and reduce the ability to accurately control the amount of components. Moreover, the processability by the products is not uniform.
- Embodiments of the present invention relate to a method for improving the dent-resistance of a steel plate. It may be possible to enhance yield strength of a steel plate and obtain an excellent forming property in such a manner that a steel plate is pre-strained by providing a certain reduction rate during a skin pass mill process performed for a density and shape modification of the steel plate.
- an outer panel comprising steel material such as a roof, a door, a hood, etc., having an excellent processability and a dent-resistant property is fabricated using the method of the present invention. Increasing strength of an outer panel of a vehicle may allow for decreasing the thickness of the material.
- yield strength of a steel plate may be enhanced based on an increase in the degree of work-hardening by pre-straining the steel plate in a state of one axis tensile prior to a press process.
- a method for pre-straining is achieved based on a skin pass mill process in accordance with a reduction rate of 1.8% ⁇ 2.0% during fabrication of a cold-rolled steel plate.
- FIG. 1 is a graph of an increase of tensile strength based on an increase of a reduction rate during a skin pass mill process for dent-resistance enhancing method according to the present invention
- FIG. 2 is a graph of a forming limit showing an increase in forming property after an extension based on a method for enhancing dent-resistant property according to the present invention.
- FIG. 3 is a graph illustrating a relationship between a pre-strain ratio and a FLD in a method for enhancing dent-resistant property according to the present invention.
- a few methods such as a method of applying a pre-strain during a skin pass mill process for enhancing a forming property and a dent-resistant property of parts based on yield strength enhancement of a steel plate, and a method of enhancing a reduction rate during a skin pass mill process.
- Applying a pre-strain to a material is directed to deforming the material before a press process is performed.
- the pre-straining process may be performed within a range of 5%.
- Pre-straining processes are generally performed in a deep drawing state or one axis extending state for preventing any changes in thickness of a material to enhance a forming property and strength.
- the pre-straining process may be performed by a method of providing one axis tensile force to a material before a press process is performed, but it is not very feasible to apply it to the practical field due to many obstacles in constructing the required facilities.
- a method for providing a pre-straining process to a material before a press process is performed there is provided a method of adjusting a reduction rate during a skin pass mill process. In this manner, it may be possible to apply the method to existing production facilities without additional facilities and any difficulties in the facilities or construction.
- a skin pass mill process is directed to a process last performed during a cold-rolled steel plate fabrication and is capable of adjusting a density of a steel plate and correcting a shape of the same.
- the reduction rate of the skin pass mill process may be limited within a range of 0.5% ⁇ 1.2% to provide a permissible range of a product thickness and density.
- FIG. 1 is a graph showing an increase of tensile strength based on an increase in reduction rate during a skin pass mill process for a dent-resistance enhancing method according to the present invention.
- FIG. 2 is a forming limit diagram showing a forming property after one axis extension.
- the material processed through a conventional skin pass mill process was applied with a reduction rate of 0.5%, 1%, and the result of the tests were compared.
- Table 1 shows the changes in the mechanical characteristics of SPRC 340-BH by the pre-straining process.
- the results of the forming properties in other stress states after the pre-strain is performed are shown as a forming limit diagram. Since the pre-strain of the increase of the reduction rate is one axis extension, it may be expected that the forming property is increased despite the decrease of the elongation.
- the pre-straining process may be performed using a conventional skin pass mill process, and the reduction rate may be maintained within a range of 1.8 ⁇ 2.0% higher than the conventional limited range of 0.5 ⁇ 1.2%. Therefore, it may be possible to enhance the dent-resistant property of an outer panel of a vehicle, and enhance the press forming property.
- the yield strength of the SPRC 340-BH material for FLD test
- the yield strength of the SPRC 340-BH material for FLD test
- about 4 ⁇ 5(kgf/mm 2 ) of the yield strength was increased with respect to a reduction rate of 1%.
- an additional increase by 2 ⁇ 3 kgf/mm 2 was obtained when Bake-hardening steel capable of increasing the yield strength was additionally used after the press process using the heat treatment effect during the coating process.
- FIG. 3 is a graph showing a relationship between a pre-strain ratio and FLD in a dent-resistant property enhancing method according to the present invention.
- the FLD was obtained by applying different pre-strains. Results of the tensile test following the pre-straining process, indicated that the elongation was slightly decreased by about 3%, but results of the FLD test showed a forming limit in different deformation states, where the elongation was slightly increased from 1%.
- the present invention provides a method capable of enhancing yield strength of a steel plate in such a manner that a pre-straining process may be performed with respect to a steel plate based on a skin pass mill under a condition that a certain reduction rate is maintained. Therefore, it is possible to enhance a dent-resistant property of an outer panel of a vehicle, and enhance a forming property during a press process of a steel plate.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Metal Rolling (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The present invention relates to a method for enhancing a dent-resistant property of an outer panel of a vehicle. Pre-straining is performed to a steel plate by applying a certain reduction rate during a skin pass mill process performed for enhancing a density of a steel plate and adjusting a shape of the same, so that it becomes possible to enhance yield strength of a steel plate and to obtain an excellent forming property. The present invention is basically directed to fabricating an outer panel material such as a roof, a door, a hood, etc. of an excellent vehicle material having an excellent forming property and dent-resistant property. Therefore, it is possible to decrease a thickness of a vehicle material based on an enhanced strength of an outer panel of a vehicle. The present invention may contribute to a government environment regulation counter measurement and a combustion ratio of engine.
Description
- This application claims priority of Korean Application No. 10-2003-0049099, filed on Jul. 18, 2003, the disclosure of which is incorporated fully herein by reference.
- The present invention relates to a method for improving dent-resistance of a steel plate by prestraining the steel plate through a skin pass mill process where a certain reduction rate is provided.
- In general, an outer panel of a vehicle requires improved processability for fabricating a certain part into a desired shape after a press forming process. the outer panel may also require an improved dent-resistant property. An outer panel of a vehicle body is generally made of a cold-rolled steel plate having a high elongation rate and a large plastic deformation rate. A high yield strength as well as excellent processability for fabricating an outer panel such as a door, a hood, a panel, etc. may be desirable. By contrast, if yield strength of a steel plate is low, the steel plate can be easily dented even when slightly pressed by hands or other external forces.
- A dent may indicate that a certain defect occurred on a surface of an outer panel due to the above reasons. The property of limiting a dent is referred to as dent-resistance. A steel plate should generally have high yield strength to enhance dent resistance of an outer panel of a vehicle. However, when yield strength of a steel plate is too high, a process defect may occur during a forming process before the steel plate is formed. In addition, a spring-back phenomenon may occur after the forming process. It may therefore become challenging to fabricate a certain part in a desired shape.
- Methods for enhancing yield strength of an outer panel of a vehicle body, to enhance dent-resistance of an outer panel of a vehicle body are known from the related art. For instance, methods such as a method of improving the amount of components of a steel plate, a method of using a combined material fabricated by mixing heterogeneous materials with each other, and a method achieved by combining both the above methods are known.
- For example, according to the Japanese patent laid-open No. Hei 8-35035, there is provided a dual-skin steel plate formed of an inner steel panel and a surface steel plate with a different amount of steel for enhancing dent-resistance, a fatigue property, a surface deformation resistance and a processability. In another example, according to the Japanese patent No. Hei 5-111976, there is provided a core plate of aluminum or an aluminum alloy. A construction for enhancing the entire dent-resistance is provided by conjugating a low carbon steel plate to both surfaces of the core plate. In yet another example, according to the Japanese patent No. Sho 58-37150, a steel having a ferrite-martensite is provided on a surface of the construction, and a cold-rolled steel plate having a soft steel tissue is provided in an inner side of the construction.
- Nevertheless, in the above methods, a surface defect called as a stretcher strain may occur on a surface of a steel plate, and reduce the ability to accurately control the amount of components. Moreover, the processability by the products is not uniform.
- Embodiments of the present invention relate to a method for improving the dent-resistance of a steel plate. It may be possible to enhance yield strength of a steel plate and obtain an excellent forming property in such a manner that a steel plate is pre-strained by providing a certain reduction rate during a skin pass mill process performed for a density and shape modification of the steel plate.
- In one embodiment of the present invention, an outer panel comprising steel material such as a roof, a door, a hood, etc., having an excellent processability and a dent-resistant property is fabricated using the method of the present invention. Increasing strength of an outer panel of a vehicle may allow for decreasing the thickness of the material.
- In another embodiment of the present invention, yield strength of a steel plate may be enhanced based on an increase in the degree of work-hardening by pre-straining the steel plate in a state of one axis tensile prior to a press process.
- In yet another embodiment, a method for pre-straining is achieved based on a skin pass mill process in accordance with a reduction rate of 1.8%˜2.0% during fabrication of a cold-rolled steel plate.
- The aforementioned aspects and other features of the present invention will be explained in the following description, taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a graph of an increase of tensile strength based on an increase of a reduction rate during a skin pass mill process for dent-resistance enhancing method according to the present invention; -
FIG. 2 is a graph of a forming limit showing an increase in forming property after an extension based on a method for enhancing dent-resistant property according to the present invention; and -
FIG. 3 is a graph illustrating a relationship between a pre-strain ratio and a FLD in a method for enhancing dent-resistant property according to the present invention. - Hereinafter, such embodiments of the present invention are described in detail with reference to the accompanying drawings.
- In the methods according to the present invention, there are provided a few methods such as a method of applying a pre-strain during a skin pass mill process for enhancing a forming property and a dent-resistant property of parts based on yield strength enhancement of a steel plate, and a method of enhancing a reduction rate during a skin pass mill process.
- In order to enhance a dent-resistant property of a steel plate with a mechanical process, it may be required to increase work-hardening, namely, yield strength (YP), by providing a material with a pre-straining process before a press process is performed.
- Applying a pre-strain to a material is directed to deforming the material before a press process is performed. The pre-straining process may be performed within a range of 5%.
- Pre-straining processes are generally performed in a deep drawing state or one axis extending state for preventing any changes in thickness of a material to enhance a forming property and strength. The pre-straining process may be performed by a method of providing one axis tensile force to a material before a press process is performed, but it is not very feasible to apply it to the practical field due to many obstacles in constructing the required facilities.
- In the present invention, a method for providing a pre-straining process to a material before a press process is performed, there is provided a method of adjusting a reduction rate during a skin pass mill process. In this manner, it may be possible to apply the method to existing production facilities without additional facilities and any difficulties in the facilities or construction.
- A skin pass mill process is directed to a process last performed during a cold-rolled steel plate fabrication and is capable of adjusting a density of a steel plate and correcting a shape of the same.
- The reduction rate of the skin pass mill process may be limited within a range of 0.5%˜1.2% to provide a permissible range of a product thickness and density.
- It is known that the mechanical property of material may be enhanced when a reduction rate is increased, but the above principle may not be applied in the field due to a decrease of elongations and the above-described problems. So far, the researches concerning the above problems have not been successful, so that systematic researches have not been performed yet.
-
FIG. 1 is a graph showing an increase of tensile strength based on an increase in reduction rate during a skin pass mill process for a dent-resistance enhancing method according to the present invention. - According to one result, it was known that a tensile strength was increased by 1.3 kgf/mm2 when an elongation of a skin pass mill was increased by 0.4%.
- Despite the above test result, it was impossible to increase reduction rate of the skin pass mill above a certain range because increasing the tensile strength may decrease the elongation in a tensile test resulting in a decrease in a forming property.
- As shown in
FIG. 2 , however, even though the elongation may be decreased after the pre-straining process on one axis extension, the forming property may be increased.FIG. 2 is a forming limit diagram showing a forming property after one axis extension. - In one embodiment of the present invention, in order to measure the changes of material characteristics while increasing the reduction rate during the skin pass mill, the material processed through a conventional skin pass mill process was applied with a reduction rate of 0.5%, 1%, and the result of the tests were compared. Table 1 shows the changes in the mechanical characteristics of SPRC 340-BH by the pre-straining process.
TABLE 1 Yield Tensile Tensional/yield PreStrain strength strength Uniform EI Elongation strength ratio (%) (kgf/mm2) (kgf/mm2) (%) (%) r-value n-value (%) 0 23.63 20.54 20.54 39.38 1.73 0.19 64.5 0.5 26.31 18.35 18.35 37.63 1.78 0.17 71.2 1 27.46 17.84 17.84 37.45 1.73 0.16 75.9 - According to the data presented in Table 1, when the reduction rate was increased by 0.5%, the elongation was decreased about 1.8%, and the tensile/yield strengths rate was increased about 7%. When the reduction rate was increased by 1%, the elongation was decreased by 1.9% as compared with the conventional material, and the tensile/yield strengths ratio was increased by 11%. As a result of the above test, it is known that the tensile/yield strengths ratio may exceed 70% before the parts are press-processed.
- The results of the forming properties in other stress states after the pre-strain is performed are shown as a forming limit diagram. Since the pre-strain of the increase of the reduction rate is one axis extension, it may be expected that the forming property is increased despite the decrease of the elongation.
- In the present invention, the pre-straining process may be performed using a conventional skin pass mill process, and the reduction rate may be maintained within a range of 1.8˜2.0% higher than the conventional limited range of 0.5˜1.2%. Therefore, it may be possible to enhance the dent-resistant property of an outer panel of a vehicle, and enhance the press forming property.
- According to a result of the tests, when the reduction rate was increased by 1.8˜2.0%, the yield strength of the SPRC 340-BH (material for FLD test) was increased 27 kgf/mm2. Additionally, about 4˜5(kgf/mm2) of the yield strength was increased with respect to a reduction rate of 1%. Moreover, an additional increase by 2˜3 kgf/mm2 was obtained when Bake-hardening steel capable of increasing the yield strength was additionally used after the press process using the heat treatment effect during the coating process.
- An adjustment of these exemplary values may be required because high yield strength before the press process may cause a deformation in an outer panel of a vehicle in accordance with the material. Therefore, in order to fabricate a product having an excellent processability and dent-resistant property, it may be needed to systemize the physical characteristics of each material for thereby properly adjusting the above two effects.
-
FIG. 3 is a graph showing a relationship between a pre-strain ratio and FLD in a dent-resistant property enhancing method according to the present invention. - As shown in
FIG. 3 , the FLD was obtained by applying different pre-strains. Results of the tensile test following the pre-straining process, indicated that the elongation was slightly decreased by about 3%, but results of the FLD test showed a forming limit in different deformation states, where the elongation was slightly increased from 1%. - Generally, it is acknowledged that if forming property is not decreased after pre-straining process, it is successful. As shown in the above tests, the forming property was slightly increased after one axis extension.
- As described above, the present invention provides a method capable of enhancing yield strength of a steel plate in such a manner that a pre-straining process may be performed with respect to a steel plate based on a skin pass mill under a condition that a certain reduction rate is maintained. Therefore, it is possible to enhance a dent-resistant property of an outer panel of a vehicle, and enhance a forming property during a press process of a steel plate.
Claims (2)
1. A method for enhancing a dent-resistant property of a steel plate comprising:
pre-straining a steel plate by tensile forces acting along one axis;
performing a press process with respect to the steel plate; and
enhancing yield strength of the steel plate based on an increase in the degree of work-hardening.
2. A method according to claim 1 , wherein pre-straining the steel plate comprises performing a skin pass mill process on the steel plate, and the skin pass process comprises a reduction rate between about 1.8% to about 2.0% when a cold-rolled steel plate is fabricated.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020030049099A KR20050010182A (en) | 2003-07-18 | 2003-07-18 | Method for improvement in the dent-resistance of steel plate |
KR2003-49099 | 2003-07-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050011246A1 true US20050011246A1 (en) | 2005-01-20 |
Family
ID=34056894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/751,028 Abandoned US20050011246A1 (en) | 2003-07-18 | 2003-12-31 | Method for improving dent-resistance of a steel plate |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050011246A1 (en) |
JP (1) | JP2005034906A (en) |
KR (1) | KR20050010182A (en) |
DE (1) | DE10361702A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180309095A1 (en) * | 2017-04-19 | 2018-10-25 | Unifrax I Llc | Housing material for pouch-type battery and pouch-type battery including same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100878638B1 (en) * | 2006-12-28 | 2009-01-15 | 주식회사 포스코 | Uniform high strength forming process for austenitic high manganese steel having superior formability and strengths |
JP5505295B2 (en) * | 2010-12-28 | 2014-05-28 | Jfeスチール株式会社 | Surface shape design method for automotive outer plate parts with excellent dent resistance and the parts |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4036600A (en) * | 1975-06-05 | 1977-07-19 | Kawasaki Steel Corporation | Steel substrate electroplated with Al powder dispersed in Zn |
US5532051A (en) * | 1991-12-25 | 1996-07-02 | Nippon Steel Corporation | Steel sheet excellent in coating sharpness, defect-formation resistance and workability |
US5679181A (en) * | 1992-06-22 | 1997-10-21 | Toyo Kohan Co., Ltd. | Method for manufacturing a corrosion resistant nickel plating steel sheet or strip |
US6079242A (en) * | 1998-01-13 | 2000-06-27 | Sollac | Control process for continuous skin pass operation for metal strip |
US6406558B1 (en) * | 1999-11-01 | 2002-06-18 | Kawasaki Steel Corporation | Method for manufacturing magnetic steel sheet having superior workability and magnetic properties |
-
2003
- 2003-07-18 KR KR1020030049099A patent/KR20050010182A/en not_active Application Discontinuation
- 2003-12-16 JP JP2003418745A patent/JP2005034906A/en active Pending
- 2003-12-30 DE DE10361702A patent/DE10361702A1/en not_active Ceased
- 2003-12-31 US US10/751,028 patent/US20050011246A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4036600A (en) * | 1975-06-05 | 1977-07-19 | Kawasaki Steel Corporation | Steel substrate electroplated with Al powder dispersed in Zn |
US5532051A (en) * | 1991-12-25 | 1996-07-02 | Nippon Steel Corporation | Steel sheet excellent in coating sharpness, defect-formation resistance and workability |
US5679181A (en) * | 1992-06-22 | 1997-10-21 | Toyo Kohan Co., Ltd. | Method for manufacturing a corrosion resistant nickel plating steel sheet or strip |
US6079242A (en) * | 1998-01-13 | 2000-06-27 | Sollac | Control process for continuous skin pass operation for metal strip |
US6406558B1 (en) * | 1999-11-01 | 2002-06-18 | Kawasaki Steel Corporation | Method for manufacturing magnetic steel sheet having superior workability and magnetic properties |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180309095A1 (en) * | 2017-04-19 | 2018-10-25 | Unifrax I Llc | Housing material for pouch-type battery and pouch-type battery including same |
Also Published As
Publication number | Publication date |
---|---|
DE10361702A1 (en) | 2005-02-17 |
JP2005034906A (en) | 2005-02-10 |
KR20050010182A (en) | 2005-01-27 |
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