WO2013175793A1 - 溶接部靭性に優れた高靭性クラッド鋼板の母材およびそのクラッド鋼板の製造方法 - Google Patents
溶接部靭性に優れた高靭性クラッド鋼板の母材およびそのクラッド鋼板の製造方法 Download PDFInfo
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- WO2013175793A1 WO2013175793A1 PCT/JP2013/003270 JP2013003270W WO2013175793A1 WO 2013175793 A1 WO2013175793 A1 WO 2013175793A1 JP 2013003270 W JP2013003270 W JP 2013003270W WO 2013175793 A1 WO2013175793 A1 WO 2013175793A1
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- base material
- clad steel
- toughness
- steel plate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000011282 treatment Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000002648 laminated material Substances 0.000 claims description 11
- 238000005496 tempering Methods 0.000 claims description 11
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 20
- 229910045601 alloy Inorganic materials 0.000 description 14
- 239000000956 alloy Substances 0.000 description 14
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 9
- 239000010953 base metal Substances 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 102100032884 Neutral amino acid transporter A Human genes 0.000 description 2
- 101710160582 Neutral amino acid transporter A Proteins 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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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- 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
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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
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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
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- C22C—ALLOYS
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- 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
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- 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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- 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
- C22C38/14—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
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- 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
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C22C38/40—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
- 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
- C21D2251/00—Treating composite or clad material
- C21D2251/02—Clad material
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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
Definitions
- the present invention relates to a base material for a high toughness clad steel plate, a clad steel plate having the base material, and a method for producing the clad steel plate.
- Ni-based alloys or Ni alloys represented by Alloy 625 and 825 are It is attracting attention as a material suitable for these needs.
- High alloy clad steel is a steel material in which two metals with different properties are bonded to each other, Ni-base alloy or Ni alloy steel as the base material and plain steel as the base material.
- the clad steel is obtained by metallographically bonding dissimilar metals, and unlike the plating, there is no fear of peeling, and it can have new characteristics that cannot be achieved by a single metal and alloy.
- the clad steel can exhibit the same function as a solid material by selecting a laminated material having a function suitable for the purpose of each use environment. Furthermore, carbon steel and low alloy steel suitable for severe environments such as high toughness and high strength other than corrosion resistance can be applied to the base material of the clad steel.
- clad steel uses less alloying elements than solid wood, and can ensure the same corrosion resistance as solid wood, and also can ensure the same strength and toughness as carbon steel and low alloy steel. It has the advantage that both economy and functionality can be achieved.
- clad steel using a high alloy laminated material is considered to be a very useful functional steel material, and in recent years its needs are increasing in various industrial fields.
- Clad steel has different applications depending on the laminated material, and the manufacturing method is also different.
- a base material of a clad steel plate low carbon low alloy steel to which an alloy component such as Nb, V, Ti, B or the like is added is sometimes used.
- Such low-carbon low-alloy steel is manufactured by predetermined quenching and tempering (hereinafter sometimes referred to as “tempering”) or controlled rolling (TMCP) during hot rolling.
- a steel plate is formed into a pipe shape, and one-pass high-efficiency welding is performed from the front and back surfaces of the pipe.
- a steel plate to be welded referred to as a “base material” in welding terms
- base material base material (BM .)
- HAZ base metal heat affected zone
- Non-Patent Document 1 discloses an example of manufacturing based on Patent Documents 1 and 2. Furthermore, in Patent Document 3, Ti, N, Nb, V, and B are added to C, Si, Mn, and Al, and fine TiN is precipitated in the steel, thereby reducing the HAZ austenite grains and improving toughness. Techniques for improving are disclosed.
- Non-Patent Document 1 does not describe a region where the pinning effect of TiN is not sufficiently obtained.
- Patent Document 3 Since the method disclosed in Patent Document 3 requires an additional step of reheating to a temperature of 1150 ° C. or lower, there is a problem in industrially increasing the manufacturing cost.
- An object of the present invention is to provide a base material of a high toughness clad steel plate and a method for producing the clad steel plate by composite addition of alloy elements that solve the above-mentioned problems.
- the inventors note that in a base material of a clad steel plate, TiN alone cannot improve toughness, and by clarifying the behavior of precipitates, the base material toughness of the clad steel can be improved. Was revealed.
- V which is essential for the strength adjustment in the prior art, dissolves in the steel at about 900 ° C., and the hardenability becomes remarkably high, which causes the deterioration of the HAZ toughness due to hardening. It was confirmed that this V was not added during the component design of the base material of the clad steel. Furthermore, in order to suppress the decrease in the toughness of the base material of the clad steel heated in the temperature range near 1000 ° C., the precipitation amount and form of TiN and NbC can be optimized to suppress the coarsening of the ⁇ grain size during heating. I am doing so.
- the base material preferably has a thickness of 50 mm or less.
- the inventors have made various studies in addition to the above-described new findings, and have invented the following optimum component composition. That is, the invention of the base material of the high toughness clad steel plate of the present invention for solving the above-mentioned problems is as follows.
- a solution treatment is performed by heating to 900 to 1100 ° C., and then less than 550 ° C.
- the V content of HAZ toughness deterioration is reduced as much as possible, and by adding an appropriate amount of Nb, Al, Ti, N, etc., the crystal grains of the base material of the clad steel are made ultrafine, In the base material and the heat-affected zone by 1-pass welding, it is possible to obtain excellent low-temperature toughness by suppressing the coarsening of the crystal grain size.
- C 0.030 to 0.10% C is an effective component for improving the strength of steel, and if it is less than 0.030%, the strength cannot be obtained for general welding, so the content is made 0.030% or more. On the other hand, if the content exceeds 0.10%, the weldability and HAZ toughness of the steel material are remarkably deteriorated, so the C content is in the range of 0.030 to 0.10%. Preferably it is 0.04 to 0.08% of range.
- Si 0.10 to 0.30%
- Si is a component necessary for securing the strength of the base material, deoxidation, and the like, and in order to obtain the effect, it is necessary to contain at least 0.10% or more.
- the content exceeds 0.30%, the toughness decreases due to the hardening of the HAZ, so the Si content is in the range of 0.10 to 0.30%. From the viewpoint of HAZ toughness, it is preferably in the range of 0.13 to 0.20%.
- Mn 1.30 to 1.80% Mn needs to be contained in an amount of 1.30% or more as an effective component for securing the strength and toughness of the base material, but the upper limit is set to 1.80% in consideration of the toughness and cracking of the weld. Therefore, the amount of Mn is set in the range of 1.30 to 1.80%. From the viewpoint of base metal toughness and HAZ toughness, it is preferably in the range of 1.40 to 1.55%.
- P 0.015% or less P is desirable as the content is small, but in order to reduce it industrially, the cost is large, so the P amount is 0.015% or less.
- S 0.003% or less S is desirable as the content is small, and if it is too large, the toughness is remarkably lowered, so the S amount is 0.003% or less.
- Mo 0.05 to 0.50%
- Mo is an element that stably improves the strength and toughness of the base material after solution heat treatment, but if less than 0.05%, the effect cannot be obtained, so 0.05% or more is contained. Further, if the content exceeds 0.50%, the toughness of the HAZ part is impaired, so the Mo amount is set in the range of 0.05 to 0.50%. From the viewpoint of the base material strength and the HAZ toughness, it is preferably in the range of 0.08 to 0.20%.
- V Less than 0.010% V is the most notable element in the present invention and needs to be as small as possible.
- V has been positively added with the intention of strengthening precipitation by fine precipitates such as VC and VN.
- heating is performed to 900 ° C. or higher and quenching is performed.
- fine precipitates such as VC and VN dissociate when heated and dissolve in steel. This phenomenon occurs because, in the C-containing range as in the present invention, these fine precipitates dissolve when heated at 900 ° C. or higher. Therefore, the added V is less likely to be present as fine precipitates during the heating and dissociates.
- the added V acts as a hardenable element, and is hardened significantly by quenching in both the base material and the HAZ, resulting in deterioration of toughness.
- This toughness deterioration becomes significant when the content is 0.010% or more. Therefore, the V amount is less than 0.010%. Preferably, it is less than 0.004%, and more preferably not contained at an industrially possible level.
- Nb 0.010 to 0.060%
- Nb produces NbC to prevent coarsening of austenite grains when heating the steel to the solution temperature, and has the effect of fine graining.
- Nb carbide is finely and evenly dispersed in the base material, resulting in high-temperature strength, etc. The effect is exhibited with a content of 0.010% or more. However, if it exceeds 0.060%, not only the effect is not recognized, but also surface flaws are likely to occur in the steel ingot, so the Nb amount is made 0.010 to 0.060%. For the same reason, the range is preferably 0.025 to 0.05%.
- Ti 0.005 to 0.020%
- Ti like Nb, binds to N and suppresses coarsening of the crystal grain size, and has an effect of improving the toughness by refining the structure after the solution treatment. If the addition amount is less than 0.005%, the effect is small, so 0.005% or more is added. Further, if the Ti content exceeds 0.020%, the weld heat affected zone toughness is greatly deteriorated due to the notch effect, so the Ti content is in the range of 0.005 to 0.020%. Preferably, it is 0.010 to 0.016% of range.
- Al 0.040% or less
- Al is an element effective as a deoxidizing agent, and prevents coarsening of the austenite crystal grain size during solution treatment as AlN, but if included over 0.040% The effect of atomization is reduced and the toughness is deteriorated.
- the Al content is made 0.040% or less. For the same reason, it is preferably 0.035% or less.
- Ca controls the morphology of sulfide inclusions to improve the toughness of the heat affected zone of the weld.
- Ca is effective in controlling the morphology of MnS and improves the impact value. It also improves the resistance to hydrogen-induced cracking resistance.
- the Ca content that exhibits this effect is 0.0010% or more. However, if it exceeds 0.0040%, the effect is saturated, conversely, the cleanliness is lowered, the weld heat affected zone toughness is deteriorated, the resistance to hydrogen-induced cracking is deteriorated, and surface flaws are likely to occur in the steel ingot.
- the Ca content is in the range of 0.0010 to 0.0040%. Preferably it is 0.0020 to 0.0030% of range.
- N 0.0030 to 0.0060% N precipitates as TiN and is effective in improving the HAZ toughness. However, if the N content is less than 0.0030, the effect is reduced, so the lower limit is made 0.0030%. However, 0.0060% Exceeding the amount of solute N increases and HAZ toughness decreases. Considering improvement of HAZ toughness by fine precipitation of TiN corresponding to the amount of Ti added, the amount of N is set in the range of 0.0030 to 0.0060%. Preferably it is 0.0030 to 0.0040% of range.
- Ni, Cr and Cu may be selectively contained in the following range.
- Ni 0.10 to 0.50% Ni is effective for improving the strength and toughness of the base material, and it is preferable to add 0.10% or more. However, the effect is saturated when added over 0.50%, and the content of Ni increases the manufacturing cost. Therefore, when adding Ni, the amount of Ni should be in the range of 0.10 to 0.50%. Is preferred. More preferably, it is in the range of 0.20 to 0.40%.
- the Cr content is preferably in the range of 0.01 to 0.50%. More preferably, it is in the range of 0.01 to 0.30%.
- Cu 0.005 to 0.050%
- Cu is effective in improving toughness and increasing strength, and 0.005% or more is preferably added.
- excessive addition may increase cracking susceptibility during welding. Therefore, when adding Cu, the amount of Cu is preferably in the range of 0.005 to 0.050%. More preferably, it is in the range of 0.01 to 0.025%.
- Ti and N are elements that are important for generating TiN and improving the toughness of HAZ as described above, and the correlation between the contents of both elements is also important in order to fully exhibit this effect. . That is, when Ti / N is less than 2.0, the crystal grains become coarse and the toughness value may be greatly reduced. Moreover, when Ti / N exceeds 3.5, the toughness value may decrease for the same reason. Therefore, Ti / N is preferably in the range of 2.0 to 3.5. More preferably, it is in the range of 2.5 to 3.5.
- Nb / C 0.2 to 2.0
- Nb and C produce NbC and are effective in reducing the grain size, and contribute to toughness improvement during the quenching and tempering treatment as in the present invention.
- the effect is exhibited when Nb / C is 0.2 or more, and when Nb / C exceeds 2.0, the effect is not recognized. Therefore, Nb / C is preferably in the range of 0.2 to 2.0. More preferably, it is in the range of 0.3 to 1.8.
- Ductile fracture surface ratio at -20 ° C is 85% or more
- SA (%) ductile fracture surface ratio
- the ductile fracture surface ratio at ⁇ 20 ° C. is set to 85% or more (85% SATT). This can increase safety and is industrially useful.
- the base material of the clad steel of the present invention is adjusted to the above-described component range and can be melted by a conventional method or the like.
- the material of the laminated material is selected depending on the application and the like, and the clad steel is formed by clad rolling.
- high alloys such as Alloy 625 and 825 can be used as a bonding material.
- the base material of the clad steel is desirably 50 mm or less. Further, when the thickness of the base material is 25 mm or more, the paired material and the base material can be overlapped and rolled in one set, and when the thickness is less than 25 mm, two sets can be stacked and rolled.
- the conditions during clad rolling are not particularly limited, and can be performed by a conventional method.
- the clad steel plate obtained as described above is heated in the range of 900 to 1100 ° C. for solution treatment. If the solution treatment is less than 900 ° C., sufficient base material strength cannot be secured, and if it exceeds 1100 ° C., the toughness of the base material deteriorates. Therefore, it is heated in the range of 900 to 1100 ° C. for solution treatment. More preferably, the temperature is 900 to 980 ° C.
- the solution treatment time is preferably 10 to 30 minutes although it depends on the thickness of the clad steel plate. However, holding at a high temperature for a long time may cause a precipitate to form in the laminated material depending on the type of the laminated material, and may be shorter than 10 minutes.
- quenching is performed by a method such as water cooling or oil cooling (for example, a cooling rate of 2 ° C./s or more).
- the temperature is set to less than 550 ° C.
- the tempering temperature is preferably in the range of 420 to 500 ° C. Examples of the heating time during tempering include 5 to 35 minutes.
- the base material of the clad steel plate can be refined by the series of tempering treatments.
- the clad steel plate can be used as a clad steel pipe in the form of a plate or formed into a steel pipe.
- the clad steel sheet can be welded in one pass on the front and back sides at the time of welding, and the fine structure in the HAZ portion is maintained even by the one pass welding, and good toughness is ensured.
- the toughness of the base material was evaluated by taking a DWTT test piece based on API-5L and performing a DWTT test (falling weight characteristic) at ⁇ 20 ° C.
- a ductile fracture surface ratio of 85% or more is considered excellent in the toughness of the base material.
- the tensile strength is 590 MPa or more as the strength required for the present invention.
- a clad steel plate was manufactured using a base material having chemical components shown in Table 1 and Alloy 625.
- the manufacturing condition is that the base material and the laminated material are stacked together, heated to 1150 ° C. in a heating furnace, then hot-rolled into a clad steel plate with a base material thickness of 30 mm and a laminated material thickness of 3 mm.
- the solution treatment was performed by heating, and then a tempering treatment was performed by heating to 500 ° C.
- a tempering temperature of 600 ° C. was produced.
- the clad steel sheet after a series of heat treatments was cold-formed to produce a clad steel pipe having an outer diameter of 500 mm, and various characteristics were investigated for the base metal part and the weld heat affected zone of the base material. The results are shown in Table 2.
- No. is an example of an invention in which the chemical components of the base material all satisfy the claims of the present invention.
- the DWTT characteristic of the base material part satisfies the target characteristic.
- No. which is a comparative example Nos. 13 and 17 have V values of No. Nos. 14 and 18 have Mn values of No. 15, 19 and 20 have Ti / N values of no. 16, no.
- the value of Nb / C was out of the range of the invention, so the DWTT characteristics and tensile strength of the base material did not meet the target values.
- No. 22 and 23 had a high tempering temperature of 600 ° C., so the DWTT characteristics of the base material did not satisfy the target value.
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Abstract
Description
すなわち、上記課題を解決するための本発明の高靭性クラッド鋼板の母材の発明は、以下の通りである。
はじめに、本発明の鋼の成分組成を規定した理由を説明する。なお、成分%は、すべて質量%を意味する。
Cは鋼の強度を向上させる有効な成分であり、0.030%未満であると一般溶接用としては強度が得られないため0.030%以上とする。一方、0.10%を超えて含有すると鋼材の溶接性やHAZ靭性等を著しく劣化させるため、C量は0.030~0.10%の範囲とする。好ましくは0.04~0.08%の範囲である。
Siは母材の強度確保、脱酸等に必要な成分であり、その効果を得るためには少なくとも0.10%以上の含有が必要である。一方、0.30%を超えて含有するとHAZの硬化により靭性が低下するため、Si量は0.10~0.30%の範囲とする。なお、HAZ靭性の観点から、好ましくは0.13~0.20%の範囲である。
Mnは母材の強度及び靭性の確保に有効な成分として1.30%以上の含有が必要であるが、溶接部の靭性、割れを考慮し上限値を1.80%とする。よって、Mn量は1.30~1.80%の範囲とする。なお、母材靭性およびHAZ靭性の観点から、好ましくは1.40~1.55%の範囲である。
Pは含有量が少ないほど望ましいが、工業的に低減させるためにはコストが大きいことからP量は0.015%以下とする。
Sは含有量が少ないほど望ましく、多すぎると靭性を著しく低下させることからS量は0.003%以下とする。
Moは固溶化熱処理後の母材の強度と靭性を安定的に向上させる元素であるが、0.05%未満ではその効果が得られないため0.05%以上を含有させる。また、0.50%を超えて含有するとHAZ部の靭性を損なうため、Mo量は0.05~0.50%の範囲とする。なお、母材強度とHAZ靭性の観点から、好ましくは、0.08~0.20%の範囲である。
Vは本発明において、最も注目すべき元素であり、できるだけ少ないことが必要である。従来、Vは、VC、VN等の微細析出物による析出強化を意図して積極的に添加されてきたが、本発明のクラッド鋼の製造過程に、900℃以上に加熱して焼入れを実施する工程がある場合、VC、VN等の微細析出物は、加熱したときに解離して鋼中に固溶する。この現象が生じるのは、本発明のようなC含有範囲においては、これら微細析出物が900℃以上の加熱時に固溶するためである。したがって、添加されたVは、この加熱時に微細析出物として存在しにくくなり解離するので、焼入れ性元素として作用し、母材、HAZのいずれの領域においても焼入れにより著しく硬化して、靭性劣化の原因となる。この靭性劣化は0.010%以上含有すると顕著となる。そのため、V量は0.010%未満とする。好ましくは、0.004%未満であり、工業的に可能なレベルで含有させないことがより好ましい。
Nbは、NbCを生成することで鋼を溶体化温度に加熱時にオーステナイト粒の粗大化を防止すると共に細粒化の効果があり、Nb炭化物などを母材に微細に均一に分散し高温強度などを上昇する作用を有するが、その効果は0.010%以上の含有で発揮される。しかし0.060%を超えると効果が認められないだけでなく、鋼塊に表面庇が生じやすいため、Nb量は0.010~0.060%の範囲とする。なお、同様の理由で、好ましくは、0.025~0.05%の範囲である。
TiはNbと同様にNと結合して結晶粒度の粗大化を抑制し、固溶化処理後の組織を微細化し靭性を改善する効果がある。その添加量は0.005%未満では効果が少ないため0.005%以上含有させる。また、Ti含有量が0.020%を超えると切り欠き効果により溶接熱影響部靭性が大きく劣化するので、Ti量は0.005~0.020%の範囲とする。好ましくは、0.010~0.016%の範囲である。
Alは、脱酸剤として有効な元素であり、また、AlNとして溶体化処理時のオーステナイト結晶粒度の粗大化を防止するが、0.040%を超えて含有させると細粒化効果が低下し、靭性を劣化させる。また、0.040%を超えるとAlNが過剰に生成され鋼塊の表面庇の原因にもなることからAl量は0.040%以下とする。同様の理由から、好ましくは、0.035%以下である。
Caは硫化物系介在物の形態を制御し溶接熱影響部靭性を改善し,また、それに伴いMnSの形態制御に効果があり、衝撃値を向上させる。また、耐水素誘起割れ感受性を改善する。この効果を発揮するCaの含有量は、0.0010%以上である。しかし、0.0040%を超えると効果が飽和し、逆に清浄度を低下させ溶接熱影響部靭性を劣化させ、耐水素誘起割れ感受性が劣化する他、鋼塊に表面庇が発生しやすいので、Ca量は0.0010~0.0040%の範囲とする。好ましくは0.0020~0.0030%の範囲である。
NはTiNとして析出する事でHAZ靭性の向上に効果があるが、N含有量が0.0030未満では効果が薄れるため下限を0.0030%とする。しかしながら0.0060%
を超えると固溶Nが増大しHAZ靭性の低下がおこる。Tiの添加量と対応させTiNの微細析出によるHAZ靭性の向上を考慮すると、N量は0.0030~0.0060%の範囲とする。好ましくは0.0030~0.0040%の範囲である。
Niは母材の強度及び靭性を向上させるために有効であり、0.10%以上を添加することが好ましい。しかし、0.50%を超えて添加すると効果が飽和し、Niの含有は製造コストを上昇させるため、Niを添加する場合は、Ni量は0.10~0.50%の範囲とすることが好ましい。さらに好適には、0.20~0.40%の範囲である。
Crは母材の強度及び靭性を向上させるために有効であり、0.01%以上を添加することが好ましい。しかし、0.50%を超えて添加するとHAZ部靭性を低下させるためことがあるため、Crを添加する場合は、Cr量は0.01~0.50%の範囲とすることが好ましい。さらに好適には、0.01~0.30%の範囲である。
Cuは靭性の改善と強度の上昇に有効であり、0.005%以上を添加することが好ましい。一方、過剰な添加は溶接時の割れ感受性を高めることがある。したがってCuを添加する場合は、Cu量は0.005~0.050%の範囲とすることが好ましい。さらに好適には、0.01~0.025%の範囲である。
Ti及びNは、上記のようにTiNを生成してHAZの靱性を改善するのに重要な元素であり、該効果を充分に発揮するためには両元素の含有量の相関関係も重要となる。すなわち、Ti/Nが2.0未満であると結晶粒が粗大化し、靱性値が大きく低下することがある。また、Ti/Nが3.5を超えると同様の理由により靭性値が低下することがある。したがって、Ti/Nは2.0~3.5の範囲とすることが好ましい。さらに好適には、2.5~3.5の範囲である。
Nb、Cは、NbCを生成することで結晶粒の細粒化に効果があり、本発明のように焼入れ焼戻し処理時には靭性向上に寄与する。しかし、その効果はNb/Cが0.2以上で発揮され、Nb/Cが2.0を超えると効果が認められない。したがって、Nb/Cは、0.2~2.0の範囲とすることが好ましい。さらに好適には、0.3~1.8の範囲である。
DWTT試験:-20℃での延性破面率85%以上
ラインパイプは、脆性破壊防止の観点から、API-5Lで規定されたDWTT試験における延性破面率(SA(%))の値が高いことが望まれている。従って、-20℃での延性破面率を85%以上(85%SATT)とした。これによって、安全性を高めることができ産業上有用である。
本発明のクラッド鋼の母材素材は、前記した成分範囲に調整され、常法等により溶製することができる。該母材素材は、用途などにより合せ材の材質が選定され、クラッド圧延によりクラッド鋼板とする。
Claims (6)
- 質量%で、C:0.030~0.10%、Si:0.10~0.30%、Mn:1.30~1.80%、P:0.015%以下、S:0.003%以下、Mo:0.05~0.50%、V:0.010%未満、Nb:0.010~0.060%、Ti:0.005~0.020%、Al:0.040%以下、Ca:0.0010~0.0040%、N:0.0030~0.0060%を含有し、残部Fe及び不可避的不純物からなり、-20℃DWTT試験で延性破面率85%以上の特性を有するクラッド鋼板の母材。
- さらに、質量%で、Ni:0.10~0.50%、Cr:0.01~0.50%、Cu:0.005~0.050%の中から選ばれる1種以上を含有する請求項1に記載のクラッド鋼板の母材。
- さらに、TiとNとの質量%比であるTi/Nが、2.0~3.5の範囲にある請求項1または2に記載のクラッド鋼板の母材。
- さらに、NbとCとの質量%比であるNb/Cが、0.2~2.0の範囲にある請求項1乃至3の何れかに記載のクラッド鋼板の母材。
- 請求項1乃至4の何れかに記載の母材を有するクラッド鋼板。
- 請求項1乃至4の何れかに記載の母材と合せ材とを用いてクラッド圧延した後、900~1100℃に加熱して溶体化処理を行い、その後、550℃未満で焼戻し処理した、母材が-20℃DWTT試験で延性破面率85%以上の特性を有するクラッド鋼板の製造方法。
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JPS6043465A (ja) * | 1983-08-19 | 1985-03-08 | Nippon Kokan Kk <Nkk> | 低温靭性に優れた熱延クラツド鋼板およびその製造方法 |
FR2678642B1 (fr) * | 1991-07-03 | 1994-08-26 | Creusot Loire | Procede de fabrication d'une tole plaquee comportant une couche inoxydable et tole plaquee obtenue. |
WO1993016823A1 (en) * | 1992-02-21 | 1993-09-02 | Nkk Corporation | Method of manufacturing bent pipe of high tensile steel |
JP2969412B2 (ja) * | 1992-07-24 | 1999-11-02 | 日立化成工業株式会社 | 液晶配向膜,これを有する液晶挟持基板及び液晶表示素子 |
JP3699077B2 (ja) | 2002-10-29 | 2005-09-28 | 株式会社日本製鋼所 | 溶接熱影響部の低温靭性に優れたクラッド鋼板用母材および該クラッド鋼板の製造方法 |
CN1278791C (zh) * | 2003-11-21 | 2006-10-11 | 宝山钢铁股份有限公司 | 轧机机架衬板及其制造方法 |
JP4252974B2 (ja) | 2005-05-25 | 2009-04-08 | 株式会社日本製鋼所 | クラッド鋼用母材および該クラッド鋼用母材を用いたクラッド鋼の製造方法 |
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2013
- 2013-03-29 JP JP2013071282A patent/JP5527455B2/ja active Active
- 2013-05-22 KR KR1020147032386A patent/KR101629129B1/ko active IP Right Grant
- 2013-05-22 US US14/402,133 patent/US20150159246A1/en not_active Abandoned
- 2013-05-22 CN CN201380026749.7A patent/CN104321455A/zh active Pending
- 2013-05-22 WO PCT/JP2013/003270 patent/WO2013175793A1/ja active Application Filing
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JPS6043433A (ja) * | 1983-08-19 | 1985-03-08 | Nippon Kokan Kk <Nkk> | 耐食性および靭性に優れたクラツド鋼板の製造方法 |
JPH03229819A (ja) * | 1990-02-02 | 1991-10-11 | Nippon Steel Corp | 耐食性に優れた複合鋼板の製造方法 |
JPH0711331A (ja) * | 1993-06-29 | 1995-01-13 | Nkk Corp | 管継手の製造方法 |
JP2008030086A (ja) * | 2006-07-28 | 2008-02-14 | Japan Steel Works Ltd:The | 高強度クラッド鋼板の製造方法 |
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CN105671424A (zh) * | 2016-01-26 | 2016-06-15 | 宝山钢铁股份有限公司 | 一种管线用镍基合金复合钢板及其制造方法 |
Also Published As
Publication number | Publication date |
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JP5527455B2 (ja) | 2014-06-18 |
JP2014001449A (ja) | 2014-01-09 |
KR20150003350A (ko) | 2015-01-08 |
KR101629129B1 (ko) | 2016-06-09 |
US20150159246A1 (en) | 2015-06-11 |
CN104321455A (zh) | 2015-01-28 |
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