WO2015162939A1 - 厚鋼板及びその製造方法 - Google Patents
厚鋼板及びその製造方法 Download PDFInfo
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- WO2015162939A1 WO2015162939A1 PCT/JP2015/002244 JP2015002244W WO2015162939A1 WO 2015162939 A1 WO2015162939 A1 WO 2015162939A1 JP 2015002244 W JP2015002244 W JP 2015002244W WO 2015162939 A1 WO2015162939 A1 WO 2015162939A1
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- steel plate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005098 hot rolling Methods 0.000 claims description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- 230000007423 decrease Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 9
- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 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
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack 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
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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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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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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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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- C22C38/02—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
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- 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
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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
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
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- 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
- 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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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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
- C21D2211/002—Bainite
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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
- C21D2211/008—Martensite
Definitions
- the present invention relates to a steel plate suitable for use in steel structures such as buildings, bridges, shipbuilding, marine structures, construction machinery, tanks and penstock, and a method for producing the same.
- Steel materials used in various fields such as architecture, bridges, shipbuilding, offshore structures, construction machinery, tanks and penstock, are finished to the desired shape by welding according to the shape of the steel structure.
- the size of steel structures has been remarkably increased, and the strength and thickness of steel materials used have been remarkably advanced.
- Non-Patent Document 1 there are Non-Patent Document 1 and Non-Patent Document 2 regarding the thick steel plate that is the subject of the present invention.
- the steel plate In Non-Patent Document 1, the steel plate is 210 mm thick, and in Non-Patent Document 2, the steel plate is 180 mm thick. Are listed.
- the inventors presume that the above phenomenon is caused by shear-type reverse transformation. That is, nucleation / growth of ⁇ grains usually takes place from the former ⁇ grain boundary during heating of the steel material, and along with this, refinement / sizing of the former ⁇ grain size occurs, but it contains a large amount of alloying elements. In some cases, such nucleation / growth of ⁇ grains is difficult to occur, and there is a case where a shear type reverse transformation occurs in which the old ⁇ grains themselves reversely transform to austenite. In this part, the ⁇ grains remain coarse. The bainite and martensite obtained by cooling from this state will be coarse.
- Non-Patent Documents 1 and 2 describes a technique for solving the problem that it becomes difficult to refine the old ⁇ grain size at the time of heat treatment, and is excellent in strength and toughness at the center of the plate thickness. From the viewpoint of stably producing thick steel plates, technical problems remain.
- an object of the present invention is to provide a thick steel plate excellent in strength and toughness at the central portion of the plate thickness and a method for manufacturing the same even if the plate thickness is 100 mm or more.
- the present invention targets a thick steel plate having a yield strength of 620 MPa or more and a plate thickness of 100 mm or more, in order to obtain excellent strength and toughness at the center of the plate thickness.
- the microstructure can be obtained even at the reduced cooling rate by appropriately selecting the component composition of the steel plate. Is a martensite and / or bainite structure.
- the present invention has been completed based on the above findings, and the gist of the present invention is as follows. 1. % By mass C: 0.08 to 0.20%, Si: 0.40% or less, Mn: 0.5-5.0% P: 0.015% or less, S: 0.0050% or less, Cr: 3.0% or less (including 0%), Ni: 5.0% or less (including 0%), Al: 0.080% or less (including 0%), N: 0.0070% or less, B: 0.0030% or less, and O: 0.0025% or less, The balance consists of Fe and inevitable impurities, and It has a component composition that satisfies the following relationship (1): The maximum value of the old ⁇ particle size at the center of the plate thickness is 150 ⁇ m or less in terms of the circular equivalent diameter, It has a structure in which the total area ratio of martensite and bainite in the center of the plate thickness is 80% or more, A steel plate with a yield strength of 620 MPa or more and a thickness of 100 mm or more
- the component composition is further in mass%, Cu: 0.50% or less, Mo: 1.50% or less, V: 0.200% or less and Ti: 0.005-0.020% 2.
- the component composition is further in mass%, Mg: 0.0001-0.002%, Ta: 0.01-0.20%, Zr: 0.005 to 0.1% Y: 0.001 to 0.01% Ca: 0.0005-0.0050% and REM: 0.0005-0.0100%
- the reduction rate in at least one pass is 8% or more, the reduction rate in at least one other pass is 15% or more,
- the reduction ratio in at least 3 passes among the final 5 passes is set to 8% or more to obtain the thick steel plate according to any one of 1 to 3 above.
- the present invention greatly contributes to the increase in size and safety of the steel structure and has a remarkable industrial effect.
- C 0.08 to 0.20%
- C is an element useful for obtaining the strength required for structural steel at a low cost, and for that purpose, the C content is 0.08% or more.
- the C content is set to 0.20% or less.
- the C content is preferably 0.08 to 0.14%.
- Si 0.40% or less Si is added for deoxidation, but if the Si content exceeds 0.40%, the toughness of the steel plate and the weld heat-affected zone will deteriorate significantly, so the Si content should be 0.40% or less. .
- the Si content is preferably 0.05 to 0.30%, more preferably 0.10 to 0.30%.
- Mn 0.5-5.0% Mn is added from the viewpoint of securing the strength and toughness of the steel sheet. However, if the Mn content is less than 0.5%, the effect is not sufficient, while if the Mn content exceeds 5.0%, the toughness of the steel sheet only deteriorates. Rather, the center segregation is promoted and the slab porosity is increased. Therefore, the Mn content is 5.0% or less.
- the Mn content is preferably 0.6 to 2.0%, more preferably 0.6 to 1.6%.
- P 0.015% or less
- the toughness of the steel plate and the weld heat-affected zone deteriorates remarkably, so the P content is limited to 0.015% or less.
- the present invention includes a case where P is not contained.
- S 0.0050% or less
- the toughness of the steel plate and the weld heat-affected zone deteriorates significantly, so the S content is limited to 0.0050% or less.
- the present invention includes a case where S is not contained.
- Cr 3.0% or less (including 0%) Cr is an effective element for increasing the strength of the steel sheet, but if added in a large amount, the weldability is lowered, so the Cr content is 3.0% or less.
- the Cr content is preferably 0.1 to 2.0%. However, Cr is not necessarily contained.
- Ni 5.0% or less (including 0%) Ni is a beneficial element that improves the strength of the steel sheet and the toughness of the heat affected zone. However, if the Ni content exceeds 5.0%, the economic efficiency will deteriorate significantly, so the Ni content should be 5.0% or less. .
- the Ni content is preferably 0.5 to 4.0%. However, Ni does not necessarily have to be contained.
- Al 0.080% or less (including 0%) Al is added to sufficiently deoxidize molten steel, but if the Al content exceeds 0.080%, the amount of Al dissolved in the steel sheet increases and the toughness of the steel sheet decreases, so the Al content Is 0.080% or less.
- the Al content is preferably 0.030 to 0.080%, more preferably 0.030 to 0.060%. However, Al is not necessarily contained.
- N 0.0070% or less
- N has the effect of refining the structure by forming a nitride such as Ti and the like and improving the toughness of the steel plate and the weld heat-affected zone, but if the N content exceeds 0.0070%, the steel plate The amount of N dissolved in the steel increases, the toughness of the steel sheet decreases remarkably, and coarse carbonitrides are also formed in the weld heat affected zone to reduce the toughness. Therefore, the N content is set to 0.0070% or less.
- the N content is preferably 0.0010 to 0.0050%, more preferably 0.0010 to 0.0040%.
- B 0.0030% or less B has the effect of suppressing the ferrite transformation from the grain boundary by segregating at the austenite grain boundary and enhancing the hardenability.
- B content exceeds 0.0030%, B is carbonitrided.
- the B content is preferably 0.0003 to 0.0030%, more preferably 0.0005 to 0.0020%.
- the O content is set to 0.0025% or less.
- the O content is preferably 0 to 0.0020%.
- a thick steel plate according to an embodiment of the present invention is composed of the above basic elements, the remaining Fe, and inevitable impurities.
- Cu, Mo, V, and Ti are used for the purpose of increasing the strength and toughness.
- You may contain the selected 1 type (s) or 2 or more types.
- Cu 0.50% or less Cu is a useful element that can improve the strength of the steel sheet without impairing toughness. However, if the Cu content exceeds 0.50%, the surface of the steel sheet is cracked during hot working. When added, its content is preferably 0.50% or less.
- Mo 1.50% or less Mo is an element effective for increasing the strength of steel sheets. However, if the Mo content exceeds 1.50%, the hardness increases due to precipitation of alloy carbides and the toughness decreases, so Mo is added. In that case, the content is preferably 1.50% or less. The Mo content is more preferably 0.020 to 0.80%.
- V 0.200% or less V is effective in improving the strength and toughness of the steel sheet, and is effective in reducing solute N by precipitating as VN. However, when V content exceeds 0.200%, it is hard. When VC is added, its content is preferably 0.200% or less because the toughness is lowered by the precipitation of VC. The V content is more preferably 0.010 to 0.100%.
- Ti 0.005-0.020%
- Ti content exceeds 0.020%, Ti nitride becomes coarse and the toughness of the steel sheet decreases, so when Ti is added, the content is preferably in the range of 0.005 to 0.020%.
- the Ti content is more preferably 0.008 to 0.015%.
- Mg, Ta, Zr, Y, Ca and REM are used for the purpose of further improving the material. You may contain 1 type, or 2 or more types selected from.
- Mg 0.0001 to 0.002%
- Mg is an effective element for forming a stable oxide at a high temperature, effectively suppressing the coarsening of old ⁇ grains in the weld heat affected zone, and improving the toughness of the weld zone.
- the Mg content is less than 0.0001%, the effect is poor.
- the Mg content exceeds 0.002%, the amount of inclusions increases and the toughness decreases, so when adding Mg, the content is 0.0001 to 0.002% is preferable.
- the Mg content is more preferably 0.0001 to 0.015%.
- Ta 0.01-0.20% Addition of Ta is effective for improving the strength. However, when the Ta content is less than 0.01%, the effect is poor. On the other hand, when the Ta content exceeds 0.20%, the toughness decreases due to precipitate formation. Therefore, when Ta is added, the content is 0.01 to 0.20. % Is preferable.
- Zr 0.005-0.1%
- Zr is an element effective for improving the strength of steel sheets, but its effect is poor when the Zr content is less than 0.005%, while when the Zr content exceeds 0.1%, coarse precipitates are produced and the toughness decreases. Therefore, when Zr is added, its content is preferably 0.005 to 0.1%.
- Y 0.001 to 0.01%
- Y is an element effective for forming a stable oxide at a high temperature, effectively suppressing the coarsening of old ⁇ grains in the weld heat affected zone, and improving the toughness of the weld zone.
- the Y content is less than 0.001%, the effect is poor.
- the Y content exceeds 0.01%, the amount of inclusions increases and the toughness decreases, so when Y is added, the content is 0.001 to It is preferable to set it as 0.01%.
- Ca 0.0005 to 0.0050%
- Ca is an element useful for controlling the form of sulfide inclusions, and the Ca content is set to 0.0005% or more in order to exert the effect.
- the Ca content exceeds 0.0050%, the cleanliness is lowered and the toughness is deteriorated. Therefore, when Ca is added, its content is preferably 0.0005 to 0.0050%.
- the Ca content is more preferably 0.0005 to 0.0025%.
- REM 0.0005-0.0100%
- the REM content is set to 0.0005% or more.
- the REM content exceeds 0.0100%, the effect is saturated. Therefore, when REM is added, its content is preferably 0.0005 to 0.0100%.
- the REM content is more preferably 0.0005 to 0.0050%.
- the present invention is directed to a steel type in which the above-described shear-type reverse transformation is particularly likely to occur and the old ⁇ grain size is less likely to be refined and sized.
- such steel types can be classified by carbon equivalent, and the present invention has an excellent effect in the component composition in which the carbon equivalent Ceq IIW defined by the following formula (1) is 0.65% or more. Demonstrate. Therefore, in the present invention, in addition to the composition range of the basic component described above, a thick steel plate having a component composition satisfying a carbon equivalent Ceq IIW of 0.65% or more is targeted.
- Ceq IIW [% C] + [% Mn] / 6 + [% Ni] / 15 + [% Cr] /5 ⁇ 0.65 (1) '
- the old ⁇ grain size has a strong correlation with toughness, and the larger the old ⁇ grain size, the lower the toughness.
- the desired toughness can be stably ensured by setting the maximum value of the prior ⁇ grain size at the center of the sheet thickness to 150 ⁇ m or less in terms of the equivalent circle diameter.
- the maximum value of the prior ⁇ grain size at the center of the plate thickness is preferably 120 ⁇ m or less.
- the “plate thickness center portion” means a region having a depth of 45 to 55% of the plate thickness in the plate thickness direction from the surface of the steel plate (a thickness region of 10% of the plate thickness center). In the prior art, it has not been possible to reduce the maximum value of the prior ⁇ grain size at the center of the plate thickness to 150 ⁇ m or less.
- the old ⁇ particle size is the maximum value of the old ⁇ particle size at the center of the plate thickness. If the thickness is made 150 ⁇ m or less, the maximum value of the old ⁇ grain size of the plate thickness surface layer part inevitably becomes 150 ⁇ m or less.
- the structure is a martensite and / or bainite structure. This also applies to the thickness center portion. Specifically, it is important that the total area ratio of martensite and bainite in the center portion of the plate thickness is 80% or more. When the total area ratio is less than 80%, the toughness at the center of the plate thickness cannot be obtained sufficiently.
- the rest of the structure is ferrite, pearlite, and the like.
- the “total area ratio of martensite and bainite in the center portion of the plate thickness” is determined by observing the structure of the sample collected from the center portion of the plate thickness. Specifically, using a scanning electron microscope, it is determined by observing 50 or more fields at 3000 times and quantifying the tissue.
- the thick steel plate of the present invention is excellent in strength and toughness at the center of the plate thickness even when the plate thickness is 100 mm or more by satisfying the above component composition and structure.
- the yield strength is 620 MPa or more
- the toughness (vE-40) of the steel plate at ⁇ 40 ° C. can be 170 J or more.
- the upper limit of the plate thickness is not particularly limited, but in the case of a normal thick steel plate, the plate thickness is 300 mm or less.
- temperature (degreeC) shall mean the temperature in a plate
- Steel material for rolling After melting the molten steel adjusted to the above component composition by a normal method such as a converter, an electric furnace, a vacuum melting furnace, etc., a slab by a normal casting method such as a continuous casting method or an ingot method, Use steel materials for rolling such as billets. Moreover, when there are restrictions, such as the load of a rolling mill, you may perform ingot rolling and make the plate
- Heating temperature of steel material Ac 3 points to 1200 ° C Subsequently, the steel material is heated to an Ac 3 point or higher and 1200 ° C. or lower.
- the reason why the steel material is heated to the Ac 3 transformation point or higher is to make the steel uniform in one phase of the austenite structure, and the specific heating temperature is preferably 1000 ° C. or higher and 1200 ° C. or lower.
- Ac 3 transformation point a value that is calculated by the following equation (2).
- the steel material is hot-rolled to obtain a steel plate having a thickness of 100 mm or more. It is important to suppress the formation of coarse old ⁇ grains during hot rolling with respect to components that are difficult to refine and adjust the old ⁇ grain size during heat treatment. In order to refine the old ⁇ grains, promotion of recrystallization in the ⁇ region is effective, and in particular, recrystallization in the post-rolling stage is effective.
- the reduction rate in at least 3 passes among the final 5 passes is set to 8% or more, thereby effectively promoting the recrystallization of the center portion of the plate thickness and forming coarse old ⁇ grains. Can be suppressed. In addition, it is more effective to continuously perform passes with a rolling reduction of 8% or more.
- the reduction rate in at least one pass is set to 8% or more, and the reduction rate in at least one other pass is set to 15% or more, thereby effectively promoting recrystallization at the center of the plate thickness.
- the formation of coarse old ⁇ grains can be suppressed.
- the steel sheet is allowed to cool to a temperature of 300 ° C. or lower, and then reheated to an Ac 3 point or higher and 1050 ° C. or lower, and then the steel sheet is rapidly cooled from an Ar 3 point or higher temperature to 350 ° C. or lower.
- the reason why the reheating temperature is set to 1050 ° C. or lower is that when the steel sheet is reheated at a high temperature exceeding 1050 ° C., the austenite grains are coarsened and the toughness of the steel sheet is significantly reduced. Further, when the reheating temperature is less than the Ar 3 point, the toughness of the steel sheet is lowered.
- the cooling stop temperature was set to 350 ° C or lower because when the cooling stop temperature exceeds 350 ° C, non-uniform carbides are generated in the subsequent air cooling process, and coarse carbides are generated during tempering, resulting in the toughness of the steel sheet. This is because it deteriorates.
- Ar 3 transformation point a value calculated by the following equation (3) is used.
- Ar 3 910 ⁇ 310 [% C] ⁇ 80 [% Mn] ⁇ 20 [% Cu] ⁇ 15 [% Cr] ⁇ 55 [% Ni] ⁇ 80 [% Mo] (3)
- [% M] indicates the content (% by mass) of the element M in the steel material.
- the temperature at the center of the plate thickness is obtained by simulation calculation or the like from the plate thickness, surface temperature, cooling conditions, and the like.
- the temperature at the center of the plate thickness can be obtained by calculating the temperature distribution in the plate thickness direction using the difference method.
- the quenching method is generally water cooling industrially, it is desirable that the cooling rate be as fast as possible. Therefore, the cooling method may be other than water cooling, for example, gas cooling.
- tempering temperature is 450 ° C to 700 ° C.
- the tempering temperature is less than 450 ° C, the low temperature tempering causes brittleness, leading to a decrease in toughness. This is to cause a decrease.
- repeated quenching is performed for the purpose of strengthening the steel, but repeated quenching may also be performed in the present invention.
- Total area ratio of martensite and bainite The total area ratio of martensite and bainite was determined by the method described above. The results are shown in Table 2.
- any of the invention examples (Sample Nos. 1 to 21) in which the component composition, the maximum value of the prior ⁇ particle size, and the total area ratio of martensite and bainite all satisfy the requirements of the present invention
- YS is 620 MPa or more
- TS is 720 MPa or more
- the toughness at ⁇ 40 ° C. (vE-40) is 170 J or more
- YS is 690 MPa or more
- TS is 720 MPa or more
- the toughness at ⁇ 40 ° C. is 100 J (vE-40). It was above, and it was confirmed that it is excellent in the intensity
Abstract
Description
1.質量%で、
C:0.08~0.20%、
Si:0.40%以下、
Mn:0.5~5.0%、
P:0.015%以下、
S:0.0050%以下、
Cr:3.0%以下(但し、0%を含む)、
Ni:5.0%以下(但し、0%を含む)、
Al:0.080%以下(但し、0%を含む)、
N:0.0070%以下、
B:0.0030%以下、及び
O:0.0025%以下を含有し、
残部はFe及び不可避的不純物からなり、かつ、
以下の(1)の関係を満足する成分組成を有し、
板厚中心部における旧γ粒径の最大値が円相等径で150μm以下であり、
板厚中心部におけるマルテンサイト及びベイナイトの合計面積率が80%以上である組織を有することを特徴とする、
降伏強度が620MPa以上で板厚が100mm以上の厚鋼板。
CeqIIW=[%C]+[%Mn]/6+([%Cu]+[%Ni])/15+([%Cr]+[%Mo]+[%V])/5≧0.65・・・(1)
ただし、[%M]は、前記厚鋼板中における元素Mの含有量(質量%)を示し、前記厚鋼板中に当該元素が含有されない場合には0とする。
Cu:0.50%以下、
Mo:1.50%以下、
V:0.200%以下、及び
Ti:0.005~0.020%
のうちから選んだ1種又は2種以上を含有する、前記1に記載の厚鋼板。
Mg:0.0001~0.002%、
Ta:0.01~0.20%、
Zr:0.005~0.1%、
Y:0.001~0.01%、
Ca:0.0005~0.0050%、及び
REM:0.0005~0.0100%
のうちから選んだ1種又は2種以上を含有する、前記1又は2に記載の厚鋼板。
その後、前記スラブを3パス以上で熱間圧延して、板厚が100mm以上の鋼板を得る工程と、
その後、前記鋼板をAc3点以上1050℃以下に再加熱する工程と、
その後、前記鋼板をAr3点以上の温度から350℃以下まで急冷する工程と、
その後、前記鋼板に450℃以上700℃以下の温度で焼戻し処理を施す工程と、
を有し、前記熱間圧延が3パス又は4パスで行われる場合には、少なくとも1パスでの圧下率を8%以上とし、少なくとも他の1パスでの圧下率を15%以上とし、前記熱間圧延が5パス以上で行われる場合には、最終5パスのうち少なくとも3パスでの圧下率を各々8%以上として、前記1~3のいずれか一項に記載の厚鋼板を得ることを特徴とする厚鋼板の製造方法。
Cは、構造用鋼に求められる強度を安価に得る上で有用な元素であり、そのためにはC含有量は0.08%以上とする。一方、C含有量が0.20%超えの場合、鋼板および溶接熱影響部の靭性が著しく劣化するため、C含有量は0.20%以下とする。C含有量は、好ましくは0.08~0.14%である。
Siは、脱酸のために添加するが、Si含有量が0.40%超えの場合、鋼板および溶接熱影響部の靭性が著しく劣化するため、Si含有量は0.40%以下とする。Si含有量は、好ましくは0.05~0.30%であり、より好ましくは0.10~0.30%である。
Mnは、鋼板の強度及び靭性を確保する観点から添加するが、Mn含有量が0.5%未満ではその効果が十分でなく、一方Mn含有量が5.0%超えの場合、鋼板の靭性が劣化するだけではなく、中心偏析が助長されスラブのポロシティを大型化する。このため、Mn含有量は5.0%以下とする。Mn含有量は、好ましくは0.6~2.0%であり、より好ましくは0.6~1.6%である。
P含有量が0.015%超えの場合、鋼板および溶接熱影響部の靭性が著しく劣化するため、P含有量は0.015%以下に制限する。本発明は、Pが含有されない場合も含む。
S含有量が0.0050%超えの場合、鋼板および溶接熱影響部の靭性が顕著に劣化するため、S含有量は0.0050%以下に制限する。本発明は、Sが含有されない場合も含む。
Crは、鋼板の高強度化に有効な元素であるが、多量に添加すると溶接性を低下させるので、Cr含有量は3.0%以下とする。Cr含有量は、好ましくは0.1~2.0%である。但し、Crは必ずしも含有していなくても良い。
Niは、鋼板の強度および溶接熱影響部の靭性を向上させる有益な元素であるが、Ni含有量が5.0%超えの場合、経済性が著しく悪化するため、Ni含有量は5.0%以下とする。Ni含有量は、好ましくは0.5~4.0%である。但し、Niは必ずしも含有していなくても良い。
Alは、溶鋼を十分に脱酸するために添加されるが、Al含有量が0.080%超えの場合、鋼板中に固溶するAl量が多くなり、鋼板の靭性が低下するので、Al含有量は0.080%以下とする。Al含有量は、好ましくは0.030~0.080%であり、より好ましくは0.030~0.060%である。但し、Alは必ずしも含有していなくても良い。
Nは、Tiなどと窒化物を形成することによって組織を微細化し、鋼板および溶接熱影響部の靭性を向上させる効果を有するが、N含有量が0.0070%超えの場合、鋼板中に固溶するN量が増大し、鋼板の靭性が著しく低下し、さらに溶接熱影響部においても粗大な炭窒化物が形成され靭性が低下するので、N含有量は0.0070%以下とする。N含有量は、好ましくは0.0010~0.0050%であり、より好ましくは0.0010~0.0040%である。
Bは、オーステナイト粒界に偏析することで粒界からのフェライト変態を抑制し、焼入性を高める効果を有するが、B含有量が0.0030%超えの場合、Bが炭窒化物として析出し焼入性を低下させる結果、靭性が低下するので、B含有量は0.0030%以下とする。B含有量は、好ましくは0.0003~0.0030%であり、より好ましくは0.0005~0.0020%である。
O含有量が0.0025%超えの場合、鋼板中で硬質な酸化物を生成し、靭性が顕著に低下するので、O含有量は0.0025%以下とする。O含有量は、好ましくは0~0.0020%である。
Cuは、靭性を損なうことなく鋼板の強度の向上を図れる有用元素であるが、Cu含有量が0.50%超えの場合、熱間加工時に鋼板表面に割れを生じるので、Cuを添加する場合、その含有量は0.50%以下が好ましい。
Moは、鋼板の高強度化に有効な元素であるが、Mo含有量が1.50%超えの場合、合金炭化物の析出により硬度が上昇し、靭性が低下するので、Moを添加する場合、その含有量は1.50%以下が好ましい。Mo含有量は、より好ましくは0.020~0.80%である。
Vは、鋼板の強度及び靭性の向上に効果があり、またVNとして析出することで固溶Nの低減にも有効であるが、V含有量が0.200%超えの場合、硬質なVCの析出により靭性が低下するので、Vを添加する場合、その含有量は0.200%以下とするのが好ましい。V含有量は、より好ましくは0.010~0.100%である。
Tiは、加熱時にTiNを生成し、オーステナイトの粗大化を効果的に抑制し、鋼板および溶接熱影響部の靭性を向上させる。しかし、Ti含有量が0.020%超えの場合、Ti窒化物が粗大化し鋼板の靭性が低下するので、Tiを添加する場合、その含有量は0.005~0.020%の範囲とするのが好ましい。Ti含有量は、より好ましくは0.008~0.015%である。
Mgは、高温で安定な酸化物を形成し、溶接熱影響部の旧γ粒の粗大化を効果的に抑制し、溶接部の靭性を向上させるのに有効な元素である。しかし、Mg含有量が0.0001%未満の場合その効果が乏しく、一方Mg含有量が0.002%超えの場合、介在物量が増加し靭性が低下するので、Mgを添加する場合、その含有量は0.0001~0.002%とするのが好ましい。Mg含有量は、より好ましくは0.0001~0.015%である。
Taを添加すると、強度向上に有効である。しかし、Ta含有量が0.01%未満の場合その効果が乏しく、一方Ta含有量が0.20%超えの場合、析出物生成により靭性が低下するため、Taを添加する場合、その含有量は0.01~0.20%とすることが好ましい。
Zrは、鋼板の強度向上に有効な元素であるが、Zr含有量が0.005%未満の場合その効果が乏しく、一方Zr含有量が0.1%超えの場合、粗大な析出物を生成し靭性が低下するため、Zrを添加する場合、その含有量は0.005~0.1%とすることが好ましい。
Yは、高温で安定な酸化物を形成し、溶接熱影響部の旧γ粒の粗大化を効果的に抑制し、溶接部の靭性を向上させるのに有効な元素である。しかし、Y含有量が0.001%未満の場合その効果が乏しく、一方Y含有量が0.01%超えの場合、介在物量が増加し靭性が低下するので、Yを添加する場合、その含有量は0.001~0.01%とすることが好ましい。
Caは、硫化物系介在物の形態制御に有用な元素であり、その効果を発揮させるためには、Ca含有量は0.0005%以上とする。しかし、Ca含有量が0.0050%超えの場合、清浄度の低下を招き靭性が劣化する。よって、Caを添加する場合、その含有量は0.0005~0.0050%とするのが好ましい。Ca含有量は、より好ましくは0.0005~0.0025%である。
REMも、Caと同様に、鋼板中で酸化物及び硫化物を形成して材質を改善する効果があり、その効果を得るためには、REM含有量は0.0005%以上とする。しかし、REM含有量が0.0100%超えの場合、その効果が飽和する。よって、REMを添加する場合、その含有量は0.0005~0.0100%とするのが好ましい。REM含有量は、より好ましくは0.0005~0.0050%である。
CeqIIW=[%C]+[%Mn]/6+([%Cu]+[%Ni])/15+([%Cr]+[%Mo]+[%V])/5≧0.65・・・(1)
ただし、[%M]は、厚鋼板中における元素Mの含有量(質量%)を示し、前記厚鋼板中に当該元素が含有されない場合には0とする。なお、「当該元素が含有されない」とは、当該元素の含有量が検出限界以下のため把握できないことを意味する。
CeqIIW=[%C]+[%Mn]/6+[%Ni]/15+[%Cr]/5≧0.65・・・(1)’
上記した成分組成に調整した溶鋼を、転炉、電気炉、真空溶解炉等の通常の方法で溶製したのち、連続鋳造法や造塊法等の通常の鋳造方法でスラブ、ビレットなどの圧延用の鋼素材とする。また、圧延機の荷重等の制約がある場合には、分塊圧延を行い、鋼素材の板厚を小さくしても良い。
続いて、鋼素材をAc3点以上1200℃以下に加熱する。鋼素材をAc3変態点以上に加熱するのは、鋼をオーステナイト組織一相に均一化するためであり、具体的な加熱温度としては、1000℃以上1200℃以下とすることが好ましい。なお、Ac3変態点は、次式(2)により計算される値を用いる。
Ac3 =937.2-476.5[%C]+56[%Si]-19.7[%Mn]-16.3[%Cu]-26.6[%Ni]-4.9[%Cr]+38.1[%Mo]+124.8[%V]+136.3[%Ti]+198.4[%Al]+3315[%B] ・・・(2)
ただし、[%M]は、鋼素材中の元素Mの含有量(質量%)を示す。
続いて、鋼素材を熱間圧延して、板厚が100mm以上の鋼板を得る。本発明が対象とする、熱処理時に旧γ粒径の微細化、整粒化が起こり難い成分では、熱間圧延時に粗大な旧γ粒の形成を抑制することが重要である。旧γ粒を微細化するためには、γ域での再結晶の促進が有効であり、特に圧延後段での再結晶が有効である。熱間圧延による加工が十分に加わりにくい板厚100mm以上の厚鋼板を製造する場合、少なくとも5パスの熱間圧延を施すことが好ましく、より好ましくは6パス以上11パス以下である。この場合には、最終5パスのうち少なくとも3パスでの圧下率を各々8%以上とすることにより、板厚中心部の再結晶を効果的に促進して、粗大な旧γ粒の形成を抑制することができる。また、圧下率8%以上のパスを連続的に行うことはさらに有効である。
続いて、鋼板を300℃以下の温度まで放冷したのち、Ac3点以上1050℃以下に再加熱し、その後、鋼板をAr3点以上の温度から350℃以下まで急冷する。再加熱温度を1050℃以下とするのは、1050℃を超える高温で鋼板を再加熱すると、オーステナイト粒が粗大化して鋼板の靭性が著しく低下するためである。また、再加熱温度がAr3点未満の場合も、鋼板の靭性が低下する。
Ar3 = 910-310[%C]-80[%Mn]-20[%Cu]-15[%Cr]-55[%Ni]-80[%Mo] ・・・(3)
ただし、[%M]は、鋼素材中の元素Mの含有量(質量%)を示す。
急冷後、鋼板に焼戻し処理を施して製品とする。焼戻し温度は450℃以上700℃以下とする。焼戻し温度が450℃未満の場合、低温焼もどし脆性の影響で、靭性の低下を招き、一方焼戻し温度が700℃を超える場合、種々の炭化物が析出するとともに、鋼板の組織が粗大化し、強度の低下を招くためである。
各鋼板の板厚中心部から、圧延方向と直角方向に丸棒引張試験片(Φ=12.5mm、GL=50mm)を採取し、降伏強度(YS)、引張強度(TS)を測定した。結果を表2に示す。
各鋼板の板厚中心部から圧延方向を長手方向とする2mmVノッチシャルピー試験片を各3本ずつ採取し、各試験片について-40℃の試験温度でシャルピー衝撃試験を行ったときの吸収エネルギー(vE-40)を測定し、それらの平均値を求めた。結果を表2に示す。
各鋼板の板厚中心部から圧延方向切断面を観察面とする光学顕微鏡用サンプルを採取し、ピクリン酸により旧γ粒界を現出させて200倍で組織写真を撮影した。その写真の中の全ての旧γ粒の粒界をトレースし、画像解析により各旧γ粒の円相当径を算出し、その最大値を求めた。結果を表2に示す
既述の方法で、マルテンサイト及びベイナイトの合計面積率を求めた。結果を表2に示す。
Claims (4)
- 質量%で、
C:0.08~0.20%、
Si:0.40%以下、
Mn:0.5~5.0%、
P:0.015%以下、
S:0.0050%以下、
Cr:3.0%以下(但し、0%を含む)、
Ni:5.0%以下(但し、0%を含む)、
Al:0.080%以下(但し、0%を含む)、
N:0.0070%以下、
B:0.0030%以下、及び
O:0.0025%以下を含有し、
残部はFe及び不可避的不純物からなり、かつ、
以下の(1)の関係を満足する成分組成を有し、
板厚中心部における旧γ粒径の最大値が円相等径で150μm以下であり、
板厚中心部におけるマルテンサイト及びベイナイトの合計面積率が80%以上である組織を有することを特徴とする、
降伏強度が620MPa以上で板厚が100mm以上の厚鋼板。
CeqIIW=[%C]+[%Mn]/6+([%Cu]+[%Ni])/15+([%Cr]+[%Mo]+[%V])/5≧0.65・・・(1)
ただし、[%M]は、前記厚鋼板中における元素Mの含有量(質量%)を示し、前記厚鋼板中に当該元素が含有されない場合には0とする。 - 前記成分組成がさらに、質量%で、
Cu:0.50%以下、
Mo:1.50%以下、
V:0.200%以下、及び
Ti:0.005~0.020%
のうちから選んだ1種又は2種以上を含有する、請求項1に記載の厚鋼板。 - 前記成分組成がさらに、質量%で、
Mg:0.0001~0.002%、
Ta:0.01~0.20%、
Zr:0.005~0.1%、
Y:0.001~0.01%、
Ca:0.0005~0.0050%、及び
REM:0.0005~0.0100%
のうちから選んだ1種又は2種以上を含有する、請求項1又は2に記載の厚鋼板。 - 請求項1~3のいずれか一項に記載の成分組成を有する鋼素材を、Ac3点以上1200℃以下に加熱する工程と、
その後、前記鋼素材を3パス以上で熱間圧延して、板厚が100mm以上の鋼板を得る工程と、
その後、前記鋼板をAc3点以上1050℃以下に再加熱する工程と、
その後、前記鋼板をAr3点以上の温度から350℃以下まで急冷する工程と、
その後、前記鋼板に450℃以上700℃以下の温度で焼戻し処理を施す工程と、
を有し、前記熱間圧延が3パス又は4パスで行われる場合には、少なくとも1パスでの圧下率を8%以上とし、少なくとも他の1パスでの圧下率を15%以上とし、前記熱間圧延が5パス以上で行われる場合には、最終5パスのうち少なくとも3パスでの圧下率を各々8%以上として、請求項1~3のいずれか一項に記載の厚鋼板を得ることを特徴とする厚鋼板の製造方法。
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Also Published As
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KR101892839B1 (ko) | 2018-08-28 |
SG11201608464UA (en) | 2016-11-29 |
EP3135787A4 (en) | 2017-03-01 |
WO2015162939A8 (ja) | 2016-10-06 |
KR20160143732A (ko) | 2016-12-14 |
EP3135787B1 (en) | 2018-10-31 |
CA2945439A1 (en) | 2015-10-29 |
JP5871109B1 (ja) | 2016-03-01 |
US20170044639A1 (en) | 2017-02-16 |
EP3135787A1 (en) | 2017-03-01 |
CN106232850A (zh) | 2016-12-14 |
CA2945439C (en) | 2020-03-10 |
US10358688B2 (en) | 2019-07-23 |
JPWO2015162939A1 (ja) | 2017-04-13 |
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