EP2238271A1 - Wire rods having superior strength and ductility for drawing and method for manufacturing the same - Google Patents
Wire rods having superior strength and ductility for drawing and method for manufacturing the sameInfo
- Publication number
- EP2238271A1 EP2238271A1 EP08867709A EP08867709A EP2238271A1 EP 2238271 A1 EP2238271 A1 EP 2238271A1 EP 08867709 A EP08867709 A EP 08867709A EP 08867709 A EP08867709 A EP 08867709A EP 2238271 A1 EP2238271 A1 EP 2238271A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire rod
- less
- strength
- steel
- excluding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000011651 chromium Substances 0.000 claims abstract description 47
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 25
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 25
- 239000011572 manganese Substances 0.000 claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 239000011574 phosphorus Substances 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 239000011593 sulfur Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 67
- 239000010959 steel Substances 0.000 description 67
- 230000000052 comparative effect Effects 0.000 description 13
- 230000001965 increasing effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910001567 cementite Inorganic materials 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 5
- 241000446313 Lamella Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Definitions
- the present invention relates to a wire rod for drawing having superior strength and ductility, the wire rod being used for a tire cord, a wire rope, a piano wire, a bridge steel wire and the like, and a method for manufacturing the same, and more particularly, to a wire rod for drawing having high strength and high ductility by controlling a C content to a suitable range and simultaneously adding Si and Cr together to produce a lamella structure of pearlite into a fine pearlite microstructure, and a method for manufacturing the same.
- the strength of a base steel may be enhanced by adding a large amount of a strengthening element to the base steel.
- Carbon (C) is a representative example of the strengthening element.
- the strength of a desired wire rod is increasingly enhanced as the content of C increases from a hypoeutectoid zone to a eutectoid zone, and from a eutectoid zone to a hypereutectoid zone.
- a wire rod for drawing is prepared by drawing and heat-treating a rolled wire rod and finally processing the rolled wire rod into a wire rod.
- the rolled wire rod may be cured to drastically improve its strength. Since a lamellar spacing of the pearlite structure becomes fine, a strain-hardening coefficient increases, and a potential is piled up in the process of the wire rod, it is possible to cure the wire rod.
- strength of a wire rod may be enhanced by increasing a wire drawing strain of material, regardless of the above-mentioned processes.
- the wire drawing strain of material is closely associated with the ductility of material. Where a material is not dis- connected while being drawn, the steel material may be easily processed and the strength of a wire rod may be favorably improved.
- the present invention is designed to solve the problems of the prior art, and therefore it is an object of the present invention to provide a wire rod for drawing having high strength and high ductility by controlling a C content to a suitable range and simultaneously adding Si and Cr together to produce a lamella structure of pearlite into a fine pearlite microstructure.
- a wire rod for drawing which has superior strength and ductility, including, by weight: carbon (C): 0.87 to 1.0%, manganese (Mn): 0.1 to 0.60%, silicon (Si): 0.3 to 1.0%, sulfur (S): 0.010% or less (excluding 0%), phosphorus (P): 0.011% or less (excluding 0%), chromium (Cr): 0.1 to 0.5%, nitrogen (N): 0.007% or less (excluding 0%), and the balance of iron (Fe) and other inevitable impurities, wherein the sum (% by weight) of the Si and Cr contents satisfies the following equation: 0.6 ⁇ Si+Cr ⁇ 1.2, and the wire rod has a pearlite structure.
- one exemplary embodiment of the present invention may provide a wire rod for drawing, which has high strength and high ductility, by controlling a C content to a suitable range and simultaneously adding Si and Cr together.
- another exemplary embodiment of the present invention may provide a method for manufacturing a wire rod for drawing having high strength and high ductility.
- FIG. 1 is a graph illustrating tensile strength and reduction of area of a wire rod for drawing according to the content of carbon (C).
- FIG. 2 is a graph illustrating tensile strength and reduction of area of a wire rod for drawing according to the compositional ranges of components in the wire rod.
- FIG. 1 is a graph illustrating tensile strength and reduction of area of a wire rod according to the content of carbon (C). Referring to FIG. 1, when the content of C increase to a level of constant C content, it is difficult to expect improvement of the strength of the wire rod, and the strength of the wire rod is not enhanced, or rather decreased due to the small reduction of area.
- the strength and ductility of the wire rod for drawing may be secured by adjusting the C content to a content level at which the reduction of area of the wire rod may be secured without the continuous increases in the C content, and simultaneously adding other alloy elements, particularly Si and Cr, to produce a lamella structure of pearlite into a fine pearlite microstructure.
- compositional ranges of components in the steel sheet according to one exemplary embodiment of the present invention are described in more detail.
- the term 'percentage (%)' used in the exemplary embodiments represents '% by weight', unless indicated otherwise.
- Carbon (C) is a core element to secure strength of steel.
- a content of C exceeds 1.0%, the reduction of area (RA) of the steel is decreased, which makes it impossible to expect the improvement of the strength of steel by a drawing process, whereas, when the content of C is less than 0.87%, it is difficult to secure a desired strength of steel. Therefore, it is desirable to define the C content to 0.87 to 1.0%.
- Manganese (Mn) is an element that is effective at enhancing hardenability of steel but causes severe center segregation. In this case, when a content of Mn exceeds 0.6%, Mn has high possibility to induce formation of a low-temperature structure. On the contrary, when the content of Mn is less than 0.1%, an addition effect of Mn may not be shown sufficiently. Therefore, it is desirable to define the Mn content to 0.1 to 0.6%.
- Si silicon
- C functions to enhance the strength of steel with its increasing content, but results in the decrease in reduction of area of steel, which appears as limits on the improvement of the strength of steel.
- C functions to precipitate coarse proeutectoid cementite beyond a hypereutectoid compositional range, which provides a main crack initiation position during a drawing process.
- the addition of Si does not facilitate the formation of proeutectoid cementite within the hypereutectoid compositional range, but functions to enhance the strength of steel by means of the solution strengthening.
- Si is used as a deoxidizing agent in a steel-making process, a trace of Si is included in steel.
- Si is added at a content of less than 0.3%, the strength and ductility of steel are not improved effectively.
- the content of the added Si exceeds 1.0%, the ductility of lamellar ferrite may be deteriorated severely, thereby degrading wire drawability. Therefore, it is desirable to define the Si content to 0.3 to 1.0%.
- Cr chromium
- Cr functions to improve the strength and ductility of steel by producing a lamella structure of pearlite into a fine pearlite mi- crostructure.
- a content of Cr is less than 0.1%, the lamellar structure of pearlite into a fine pearlite microstructure is not achieved sufficiently, whereas, when the content of Cr exceeds 0.5%, a pearlite transformation rate at constant temperature is slow, which adversely affects productivity of steel. Therefore, it is desirable to define the Cr content to 0.1 to 0.5%.
- S Sulfur
- P Phosphorus
- N Nitrogen
- the wire rod satisfying the requirements regarding the above-mentioned compositional ranges may further include nickel (Ni).
- Ni functions to improve the strength and ductility of a wire rod since it facilitates the plastic deformation of cementite during a drawing process by driving one more slip system of cementite.
- Ni When a content of Ni is less than 0.3%, the strength and ductility of a wire rod are not significantly changed when compared to those of the wire rod that does not include Ni but satisfies the requirements regarding the above-mentioned compositional ranges. Therefore, it is desirable for the wire rod to include 0.3% or more of Ni.
- Ni may be more preferably used at a content of 0.3 to 1.0%.
- the wire rod for drawing includes the balance of iron (Fe) and other inevitable impurities.
- the wire rod having the above-mentioned compositional ranges has a tensile strength of 1300 MPa or more and a 30% or more reduction of area.
- a pearlite structure has an interlamellar spacing of 130 nm or less.
- the pearlite structure of the wire rod has an interlamellar spacing of 50 nm or less. The finer the interlamellar spacing of the pearlite structure is, the higher the strength of the wire rod is.
- each of steel billets having components and their contents as listed in the following Table 1 was heated at 1100 to 1300 0 C, and hot-rolled, and then cooled at a rate of 10 to 20 °C/s to obtain a wire rod. Then, each of the prepared wire rods was measured for tensile strength (TS), reduction of area (RA), and interlamellar spacing of a pearlite structure.
- FIG. 2 is a graph illustrating tensile strength and reduction of area of a wire rod for drawing according to the addition of Cr and Si in addition to 0.92% by weight of C.
- the rightmost bar graph represents a tensile strength and a reduction of area of the Inventive steel 1.
- Inventive steel 4 shows its superior strength and ductility, i.e. a tensile strength of 1364 MPa and a 38.7% reduction of area. Also, it was seen that the Inventive steel 4 has a tensile strength of 1300 MP or more and a 30% or more reduction of area when the sum of the Si and Cr contents is in a range of 0.6 to 1.2 % by weight. Also, it was revealed that the Inventive steel 5 shows its superior tensile strength and reduction of area when Ni is added at a content of 0.5 % by weight.
- Example 2 (Example 2) [93] Each of the wire rods (Inventive steel 1, Comparative steels 4 and 5) prepared in the method of Example 1 was austenized at 1050 0 C, lead-patented at a solder pot temperature of 55O 0 C to obtain a steel sheet. Then, each of the steel sheets was measured for tensile strength and interlamellar spacing. The results are listed in the following Table 2.
- the twists represent the workability or ductility of a steel wire at maintaining its superior strength.
- the superior ductility of a wire rod functions to reduce a disconnection rate of the wire rod during the drawing process and suppress the delamination in the wire rod.
- the fatigue property represents the increase in service life and durability of the wire rod.
- the fatigue property is two times higher in the Inventive steels than the Comparative steels. Therefore, it was seen that, owing to the combined addition of Si and Cr, the Inventive steel 1 shows its superior ductility and fatigue property as well as the tensile strength even after the drawing process.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070139434A KR100979006B1 (en) | 2007-12-27 | 2007-12-27 | Wire Rods Having Superior Strength And Ductility For Drawing And Method For Manufacturing The Same |
PCT/KR2008/006660 WO2009084811A1 (en) | 2007-12-27 | 2008-11-12 | Wire rods having superior strength and ductility for drawing and method for manufacturing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2238271A1 true EP2238271A1 (en) | 2010-10-13 |
EP2238271A4 EP2238271A4 (en) | 2014-10-01 |
Family
ID=40824498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08867709.1A Withdrawn EP2238271A4 (en) | 2007-12-27 | 2008-11-12 | Wire rods having superior strength and ductility for drawing and method for manufacturing the same |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100263772A1 (en) |
EP (1) | EP2238271A4 (en) |
JP (1) | JP2011509345A (en) |
KR (1) | KR100979006B1 (en) |
CN (1) | CN101910440A (en) |
WO (1) | WO2009084811A1 (en) |
Families Citing this family (19)
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JP2008069409A (en) * | 2006-09-14 | 2008-03-27 | Bridgestone Corp | High strength high carbon steel wire and producing method therefor |
KR101309881B1 (en) * | 2009-11-03 | 2013-09-17 | 주식회사 포스코 | Wire Rod For Drawing With Excellent Drawability, Ultra High Strength Steel Wire And Manufacturing Method Of The Same |
MY158506A (en) * | 2010-04-08 | 2016-10-14 | Nippon Steel Corp | Strand for saw wire and manufacturing method thereof |
MY155751A (en) | 2010-06-15 | 2015-11-30 | Nippon Steel Corp | Saw wire |
JP5411820B2 (en) * | 2010-09-06 | 2014-02-12 | 株式会社神戸製鋼所 | Flux-cored welding wire and overlay welding arc welding method using the same |
US20120128524A1 (en) * | 2010-11-22 | 2012-05-24 | Chun Young Soo | Steel wire rod having excellent cold heading quality and hydrogen delayed fracture resistance, method of manufacturing the same, and mehod of manufacturing bolt using the same |
KR101271956B1 (en) * | 2011-06-28 | 2013-06-07 | 주식회사 포스코 | High strength wire rod having excellent fatigue strength and method for manifacturing the same |
KR101353649B1 (en) * | 2011-12-23 | 2014-01-20 | 주식회사 포스코 | Wire rod and steel wire having high corrosion resistance, method of manufacturing spring and steel wire for spring |
KR101428174B1 (en) | 2012-07-13 | 2014-08-07 | 주식회사 포스코 | Steel wire having excellent torsion property and method for manufacturing thereof |
KR101518602B1 (en) * | 2013-10-29 | 2015-05-07 | 주식회사 포스코 | Method for manufacturing high-strength drawn wire having excellent twist property |
CN106661694B (en) * | 2014-08-15 | 2018-09-11 | 新日铁住金株式会社 | Wire drawing steel wire |
JP6416709B2 (en) | 2015-07-21 | 2018-10-31 | 新日鐵住金株式会社 | High strength PC steel wire |
KR101696095B1 (en) | 2015-08-28 | 2017-01-13 | 주식회사 포스코 | Method for manufacturing heat treated wire rod having excellent drawability |
JP6481770B2 (en) | 2015-10-23 | 2019-03-13 | 新日鐵住金株式会社 | Steel wire rod for wire drawing |
KR101758477B1 (en) * | 2015-12-11 | 2017-07-27 | 주식회사 포스코 | High carbon stell wire rod and steel wire having excellent strength and corrosion resistance and method for manufacturing thereof |
CN105568134A (en) * | 2016-01-05 | 2016-05-11 | 江阴兴澄特种钢铁有限公司 | Steel for carbon hub bearing of microalloying car and production method thereof |
JP6762131B2 (en) * | 2016-04-28 | 2020-09-30 | 株式会社神戸製鋼所 | Flux-cored wire |
JP6922726B2 (en) * | 2017-12-26 | 2021-08-18 | 日本製鉄株式会社 | Hot rolled wire |
US20210395868A1 (en) | 2018-10-16 | 2021-12-23 | Nippon Steel Corporation | Hot-rolled wire rod |
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JP2735647B2 (en) * | 1988-12-28 | 1998-04-02 | 新日本製鐵株式会社 | High strength and high ductility steel wire and method for producing high strength and high ductility extra fine steel wire |
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JP3283332B2 (en) * | 1993-04-08 | 2002-05-20 | 新日本製鐵株式会社 | High-strength ultrafine steel wire with excellent stranded wire workability and method for producing the same |
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-
2007
- 2007-12-27 KR KR1020070139434A patent/KR100979006B1/en active IP Right Grant
-
2008
- 2008-11-12 WO PCT/KR2008/006660 patent/WO2009084811A1/en active Application Filing
- 2008-11-12 US US12/810,061 patent/US20100263772A1/en not_active Abandoned
- 2008-11-12 JP JP2010540556A patent/JP2011509345A/en active Pending
- 2008-11-12 EP EP08867709.1A patent/EP2238271A4/en not_active Withdrawn
- 2008-11-12 CN CN200880123271.9A patent/CN101910440A/en active Pending
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US5240520A (en) * | 1990-11-19 | 1993-08-31 | Nippon Steel Corporation | High strength, ultra fine steel wire having excellent workability in stranding and process and apparatus for producing the same |
JP2001220649A (en) * | 2000-02-08 | 2001-08-14 | Nippon Steel Corp | High strength extra-fine steel wire excellent in ductility and fatigue characteristic |
JP2004091912A (en) * | 2002-09-04 | 2004-03-25 | Sumitomo Metal Ind Ltd | Steel wire rod, production method therefor and production method for steel wire using the steel wire rod |
US20040118486A1 (en) * | 2002-12-18 | 2004-06-24 | Zelin Michael Gregory | High strength, high carbon steel wire |
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Title |
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See also references of WO2009084811A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2238271A4 (en) | 2014-10-01 |
JP2011509345A (en) | 2011-03-24 |
KR20090071206A (en) | 2009-07-01 |
WO2009084811A1 (en) | 2009-07-09 |
KR100979006B1 (en) | 2010-08-30 |
US20100263772A1 (en) | 2010-10-21 |
CN101910440A (en) | 2010-12-08 |
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