EP3988678B1 - Walzdraht - Google Patents
Walzdraht Download PDFInfo
- Publication number
- EP3988678B1 EP3988678B1 EP20827854.9A EP20827854A EP3988678B1 EP 3988678 B1 EP3988678 B1 EP 3988678B1 EP 20827854 A EP20827854 A EP 20827854A EP 3988678 B1 EP3988678 B1 EP 3988678B1
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- EP
- European Patent Office
- Prior art keywords
- wire rod
- wire
- less
- hydrogen embrittlement
- steel wire
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- 229910001562 pearlite Inorganic materials 0.000 claims description 47
- 239000000203 mixture Substances 0.000 claims description 36
- 239000000126 substance Substances 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- 229910052759 nickel Inorganic materials 0.000 claims description 16
- 239000005364 simax Substances 0.000 claims description 16
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 13
- 229910052719 titanium Inorganic materials 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- XXXSILNSXNPGKG-ZHACJKMWSA-N Crotoxyphos Chemical compound COP(=O)(OC)O\C(C)=C\C(=O)OC(C)C1=CC=CC=C1 XXXSILNSXNPGKG-ZHACJKMWSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 description 218
- 239000010959 steel Substances 0.000 description 218
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 118
- 229910052739 hydrogen Inorganic materials 0.000 description 118
- 239000001257 hydrogen Substances 0.000 description 118
- 238000005491 wire drawing Methods 0.000 description 106
- 238000012545 processing Methods 0.000 description 99
- 238000012360 testing method Methods 0.000 description 87
- 230000000694 effects Effects 0.000 description 79
- 235000019589 hardness Nutrition 0.000 description 65
- 230000007797 corrosion Effects 0.000 description 50
- 238000005260 corrosion Methods 0.000 description 50
- 238000005096 rolling process Methods 0.000 description 48
- 230000000052 comparative effect Effects 0.000 description 45
- 239000002344 surface layer Substances 0.000 description 44
- 230000032798 delamination Effects 0.000 description 36
- 238000004519 manufacturing process Methods 0.000 description 28
- 238000010438 heat treatment Methods 0.000 description 22
- 229910052761 rare earth metal Inorganic materials 0.000 description 22
- 238000000034 method Methods 0.000 description 17
- 230000001965 increasing effect Effects 0.000 description 14
- 239000002994 raw material Substances 0.000 description 14
- 230000032683 aging Effects 0.000 description 13
- 230000009466 transformation Effects 0.000 description 13
- 229920006395 saturated elastomer Polymers 0.000 description 12
- 229910000859 α-Fe Inorganic materials 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 229910001563 bainite Inorganic materials 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 7
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 5
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- HGRWHBQLRXWSLV-DEOSSOPVSA-N (4s)-3'-(3,6-dihydro-2h-pyran-5-yl)-1'-fluoro-7'-(3-fluoropyridin-2-yl)spiro[5h-1,3-oxazole-4,5'-chromeno[2,3-c]pyridine]-2-amine Chemical compound C1OC(N)=N[C@]21C1=CC(C=3COCCC=3)=NC(F)=C1OC1=CC=C(C=3C(=CC=CN=3)F)C=C12 HGRWHBQLRXWSLV-DEOSSOPVSA-N 0.000 description 1
- UNQYAAAWKOOBFQ-UHFFFAOYSA-N 7-[(4-chlorophenyl)methyl]-8-[4-chloro-3-(trifluoromethoxy)phenoxy]-1-(3-hydroxypropyl)-3-methylpurine-2,6-dione Chemical compound C=1C=C(Cl)C=CC=1CN1C=2C(=O)N(CCCO)C(=O)N(C)C=2N=C1OC1=CC=C(Cl)C(OC(F)(F)F)=C1 UNQYAAAWKOOBFQ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000007545 Vickers hardness test Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- DOWVMJFBDGWVML-UHFFFAOYSA-N n-cyclohexyl-n-methyl-4-(1-oxidopyridin-1-ium-3-yl)imidazole-1-carboxamide Chemical compound C1=NC(C=2C=[N+]([O-])C=CC=2)=CN1C(=O)N(C)C1CCCCC1 DOWVMJFBDGWVML-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Images
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- 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
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- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/48—Metal baths
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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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
- C21D8/06—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
Definitions
- the amount of B is set to 0.0050% or less, preferably 0.0030% or less, and more preferably 0.0020% or less.
- the high-strength steel wire can be obtained by subjecting a wire rod having an appropriately controlled chemical composition and metal structure to wire drawing processing. It is preferable to form a fine pearlite structure having high uniformity up to a central portion by reheating the wire rod before wire drawing processing to subject the wire rod to a patenting treatment, or directly dipping the wire rod into a salt bath furnace after rolling to subject the wire rod to an isothermal transformation treatment.
- Y1 is a parameter required for controlling the hardenability of the wire rod to provide strength required by forming a fine pearlite structure having high uniformity from a surface to a central portion, and improving the hydrogen embrittlement resistance of the wire rod. Y1 should be from 1.70 to 4.50.
- the wire rod according to the present invention eight samples are collected at arbitrary equal intervals, and the relationship between the maximum value Hv simax and average value Hv siave of Vickers hardness Hv si measured at a position of a depth of 50 ⁇ m (hereinafter, may be referred to as "50 ⁇ m depth") from the surface of the wire rod in the axial cross section (cross section parallel to the longitudinal direction including the central axis) of each sample satisfies the following (4): Hv simax ⁇ Hv siave ⁇ 50 .
- the tensile strength of the wire rod is more preferably 1200 MPa or more, and still more preferably 1300 MPa or more.
- a structure other than the pearlite structure is a non-pearlite structure which cannot be discriminated as a pearlite structure being a lamellar structure of cementite and ferrite, such as partially produced martensite, bainite, and pro-eutectoid ferrite.
- the outer peripheral portion of the test piece cut to have a length of 100 mm from the axial direction of the central portion of the wire rod was evenly shaved to cut out two test pieces each machined to have a diameter of 7 mm and a length of 100 mm.
- the corrosion test was performed with (1) salt water spraying (5% NaCl spray, 35°C, 2 hr), (2) drying (humidity: 20%, 60°C, 4 hr), and (3) wetting (humidity: 95%, 50°C, 2 hr) as one cycle using a dry-wet cyclic corrosion tester capable of spraying salt water.
- a test period was set to 12 weeks.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Claims (3)
- Ein Walzdraht, umfassend eine chemische Zusammensetzung, bestehend aus, in Massen-%,C: von 0,60 bis 1,15%,Si: von 0,01 bis 1,80%,Mn: von 0,20 bis 0,90%,P: 0,015% oder weniger,S: 0,015% oder weniger,Al: von 0,005 bis 0,080%,N: von 0,0015 bis 0,0060%,Cu: von 0,10 bis 0,65%,Ni: von 0,05 bis weniger als 0,65%,Cr: von 0 bis 0,30%,Mo: von 0 bis 0,30%,Ti: von 0 bis 0,100%,Nb: von 0 bis 0,100%,V: von 0 bis 0,20%,Sn: von 0 bis 0,30%,B: von 0 bis 0,0050%,Ca: von 0 bis 0,0050%,Mg: von 0 bis 0,0050%,Zr: von 0 bis 0,100%,Seltenerdmetalle: von 0 bis 0,0200% undeinem Rest, bei dem es sich um Fe und Verunreinigungen handelt,wobei:wobei die Gehalte der Elemente C, Si, Mn, Cr, Cu, Ni, N und Ti, die in dem Walzdraht in Massen-% enthalten sind, durch [C], [Si], [Mn], [Cr], [Cu], [Ni], [N] bzw. [Ti] dargestellt sindund A A=a erfüllt, wenn ein Wert a = 350 × ([N] - 0,29 × [Ti]) gleich a ≥ 0 erfüllt, und A=0 erfüllt, wenn der Wert a < 0 erfüllt;eine Metallstruktur des Walzdrahts eine Perlitstruktur mit einem Flächenanteil von 90% oder mehr in einem Querschnitt parallel zu einer Längsrichtung, die eine Mittelachse des Walzdrahtes beinhaltet, aufweist; undwobei die Vickers-Härte, gemessen an einer Position einer Tiefe von 50 µm ausgehend von einer Oberfläche des Walzdrahts im Querschnitt für jede von acht Proben si (i ist eine ganze Zahl von 1 bis 8), gewonnen in beliebigen gleichen Abständen in der Längsrichtung des Walzdrahts, Hvsi ist und ein Mittelwert bzw. Maximalwert von Hvsi Hvsiave bzw. Hvsimax ist, wobei die Vickers-Härte wie in der Beschreibung definiert gemessen wird.
- Der Walzdraht nach Anspruch 1, wobei die beliebigen gleichen Abstände Abstände von 600 mm sind.
- Der Walzdraht nach Anspruch 1 oder 2, wobei die chemische Zusammensetzung eines oder zwei oder mehrere, ausgewählt aus der Gruppe bestehend aus, in Massen-%,Cr: von 0,01 bis 0,30%,Mo: von 0,01 bis 0,30%,Ti: von 0,002 bis 0,100%,Nb: von 0,002 bis 0,100%,V: von 0,01 bis 0,20%,Sn: von 0,01 bis 0,30%,B: von 0,0002 bis 0,0050%,Ca: von 0,0002 bis 0,0050%,Mg: von 0,0002 bis 0,0050%,Zr: von 0,0002 bis 0,100% undSeltenerdmetalle: von 0,0002 bis 0,0200% anstelle eines Teils des Fe umfasst.
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