WO2014196645A1 - 熱処理鋼材及びその製造方法 - Google Patents
熱処理鋼材及びその製造方法 Download PDFInfo
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- WO2014196645A1 WO2014196645A1 PCT/JP2014/065151 JP2014065151W WO2014196645A1 WO 2014196645 A1 WO2014196645 A1 WO 2014196645A1 JP 2014065151 W JP2014065151 W JP 2014065151W WO 2014196645 A1 WO2014196645 A1 WO 2014196645A1
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 46
- 238000001816 cooling Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 21
- 230000000694 effects Effects 0.000 description 22
- 239000010960 cold rolled steel Substances 0.000 description 15
- 229910052761 rare earth metal Inorganic materials 0.000 description 15
- 230000009471 action Effects 0.000 description 14
- 150000002910 rare earth metals Chemical class 0.000 description 14
- 238000005098 hot rolling Methods 0.000 description 13
- 238000010791 quenching Methods 0.000 description 13
- 230000000171 quenching effect Effects 0.000 description 13
- 230000000717 retained effect Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 238000000137 annealing Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 238000007747 plating Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 238000004804 winding Methods 0.000 description 9
- 238000005275 alloying Methods 0.000 description 8
- 238000005097 cold rolling Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
-
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—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
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0473—Final recrystallisation annealing
Definitions
- the present invention relates to a heat-treated steel material used for automobiles and the like and a manufacturing method thereof.
- Automotive steel sheets are required to improve fuel economy and impact resistance. For this reason, the strengthening of the steel plate for motor vehicles is achieved.
- ductility such as press formability decreases as the strength increases, making it difficult to manufacture components having complicated shapes. For example, as the ductility decreases, a portion with a high degree of work breaks, or springback and wall warpage increase, resulting in deterioration of dimensional accuracy. Therefore, it is not easy to manufacture a part by press-forming a high-strength steel plate, particularly a steel plate having a tensile strength of 780 MPa or more. According to roll forming instead of press forming, it is easy to process a high-strength steel sheet, but the application destination is limited to parts having a uniform cross section in the longitudinal direction.
- Patent Document 1 describes a method called hot pressing for the purpose of obtaining high formability in a high-strength steel sheet. According to hot pressing, a high-strength hot-pressed steel plate member can be obtained by forming a high-strength steel plate with high accuracy.
- Patent Document 2 A hot forming method for the purpose of obtaining stable strength and toughness is described in Patent Document 2, and a steel sheet for the purpose of improving formability and hardenability is described in Patent Document 3.
- Patent Document 4 A steel sheet for the purpose of achieving both strength and formability is described in Patent Document 4, and a technique for manufacturing steel sheets having a plurality of strength levels from the same steel type is described in Patent Document 5, and formability and torsion resistance are described.
- Patent Document 6 describes a technique for improving the cooling rate during hot forming.
- Non-Patent Document 1 describes the relationship between the cooling rate during quenching and the hardness and structure of hot-pressed steel.
- the impact resistance characteristics of an automobile depend on the yield strength and toughness corresponding to the tensile strength in addition to the tensile strength.
- a bumper reinforcement, a center pillar, and the like are required to suppress plastic deformation as much as possible and not break early even if deformed.
- JP 2002-102980 A JP 2004-353026 A JP 2002-180186 A JP 2009-203549 A JP 2007-291464 A JP 2010-242164 A JP 2005-169394 A
- An object of the present invention is to provide a heat-treated steel material capable of obtaining excellent collision resistance and a method for producing the same.
- the present inventors have intensively studied to determine the cause of difficulty in obtaining sufficient tensile strength, yield strength and toughness corresponding to conventional heat-treated steel materials manufactured through heat treatment such as hot stamping. It was. As a result, even if appropriate heat treatment is performed, the retained austenite is inevitably contained in the structure of the heat-treated steel, the yield strength decreases as the volume fraction of retained austenite increases, and the decrease in yield strength is mainly We found that it was caused by retained austenite.
- the present inventors have also found that a cooling rate during quenching, particularly a cooling rate in the temperature range below the martensitic transformation point (Ms point) is important for the suppression of retained austenite.
- the inventors of the present invention do not deteriorate the toughness of the heat-treated steel material produced from the steel plate even if Cr and B, which greatly contribute to the improvement of the hardenability, are contained in the heat-treated steel plate used for the production of the heat-treated steel material. I also found out.
- Conventional heat-treated steel materials contain Mn for the purpose of improving hardenability, but Mn causes a decrease in toughness. If Cr and B are contained in the steel sheet for heat treatment, the hardenability can be ensured even if the Mn content is kept low, so that the toughness of the heat treated steel material can be improved.
- Ni 0.1% to 2.0%
- Cu 0.1% to 1.0%
- Mo 0.1% to 1.0%
- V 0.1% to 1.0%
- Nb 0.01% to 1.0%
- REM 0.001% to 0.1%
- the heat-treated steel material according to any one of (1) to (3), wherein any combination of these holds.
- the steel plate % By mass C: 0.16% to 0.38%, Mn: 0.6% to 1.5%, Cr: 0.4% to 2.0%, Ti: 0.01% to 0.10%, B: 0.001% to 0.010%, Si: 0.20% or less, P: 0.05% or less, S: 0.05% or less, N: 0.01% or less, Ni: 0% to 2.0%, Cu: 0% to 1.0%, Mo: 0% to 1.0%, V: 0% to 1.0% Al: 0% to 1.0%, Nb: 0% to 1.0% REM: 0% to 0.1%, Remainder: A method for producing a heat-treated steel material having a chemical composition represented by Fe and impurities.
- the heat-treated steel material according to the embodiment of the present invention is manufactured by quenching a predetermined heat-treated steel sheet. Accordingly, the hardenability and quenching conditions of the steel plate for heat treatment affect the heat treated steel material.
- the heat-treated steel materials according to the present embodiment and the steel plates used for the production thereof are: C: 0.16% to 0.38%, Mn: 0.6% to 1.5%, Cr: 0.4% to 2.0 %, Ti: 0.01% to 0.10%, B: 0.001% to 0.010%, Si: 0.20% or less, P: 0.05% or less, S: 0.05% or less, N: 0.01% or less, Ni: 0% to 2.0%, Cu: 0% to 1.0%, Mo: 0% to 1.0%, V: 0% to 1.0%, Al: It has a chemical composition represented by 0% to 1.0%, Nb: 0% to 1.0%, REM (rare earth metal): 0% to 0.1%, the balance: Fe and impurities. Examples of the impurities include those contained in raw materials such as ore and scrap and those contained in the manufacturing process.
- C (C: 0.16% to 0.38%) C is a very important element that enhances the hardenability of the steel sheet for heat treatment and mainly determines the strength of the heat treated steel material.
- the C content is less than 0.16%, the strength of the heat-treated steel material is not sufficient. Therefore, the C content is 0.16% or more. If the C content exceeds 0.38%, the strength of the heat-treated steel material becomes too high, and the deterioration of toughness becomes remarkable. Therefore, the C content is set to 0.36% or less.
- the C content is preferably 0.36% or less.
- the C content is preferably 0.16% to 0.25%, and in order to obtain a tensile strength of more than 1700 MPa and 2200 MPa or less, the C content Is preferably more than 0.25% and not more than 0.38%.
- Mn has the effect
- the Mn content is 0.6% or more.
- the Mn content exceeds 1.5%, segregation becomes significant, so that the uniformity of mechanical properties is lowered and the toughness is deteriorated. Therefore, the Mn content is 1.5% or less.
- the Mn content is preferably 1.3% or less.
- Cr 0.4% to 2.0% Cr has the effect of improving the hardenability of the steel plate for heat treatment and enabling stable securing of the strength of the heat-treated steel material. If the Cr content is less than 0.4%, the effect of the above action may not be sufficiently obtained. Therefore, the Cr content is 0.4% or more. If the Cr content exceeds 2.0%, Cr is concentrated in the carbide in the steel sheet for heat treatment, and the hardenability is lowered. This is because the solid solution of carbide is delayed during the heating for quenching with the concentration of Cr. Therefore, the Cr content is 2.0% or less. The Cr content is preferably 1.0% or less.
- Ti has the effect of greatly improving the toughness of the heat-treated steel material. That is, Ti suppresses recrystallization and further forms fine carbides and suppresses austenite grain growth during heat treatment at a temperature of Ac 3 point or higher for quenching. By suppressing the grain growth, fine austenite grains are obtained, and the toughness is greatly improved. Ti also has the effect
- the Ti content is less than 0.01%, the effect by the above action may not be sufficiently obtained. Therefore, the Ti content is 0.01% or more. If the Ti content exceeds 0.10%, the amount of TiC deposited increases and C is consumed, so that sufficient strength may not be obtained. Therefore, the Ti content is 0.10% or less.
- the Ti content is preferably 0.08% or less.
- B is a very important element having an effect of remarkably improving the hardenability of the steel sheet for heat treatment.
- B segregates at the grain boundary, thereby strengthening the grain boundary and increasing the toughness.
- B like Ti, also has the effect of suppressing the austenite grain growth and improving the toughness. If the B content is less than 0.001%, the effect of the above action may not be sufficiently obtained. Therefore, the B content is 0.001% or more. If the B content exceeds 0.010%, a large amount of coarse boride precipitates and the toughness deteriorates. Therefore, the B content is 0.010% or less.
- the B content is preferably 0.006% or less.
- Si is not an essential element but is contained as an impurity in steel, for example. Si causes a decrease in yield strength accompanying an increase in retained austenite. Also, the higher the Si content, the higher the temperature at which austenite transformation occurs. The higher the temperature, the higher the cost required for heating for quenching, and the more easily the quenching due to insufficient heating tends to occur. Furthermore, the higher the Si content, the lower the wettability and alloying processability of the heat-treating steel sheet, so the stability of the hot dipping process and alloying process decreases. For this reason, the lower the Si content, the better. In particular, when the Si content exceeds 0.20%, the yield strength is significantly reduced. Therefore, the Si content is 0.20% or less. The Si content is preferably 0.15% or less.
- P 0.05% or less
- P is not an essential element but is contained as an impurity in steel, for example.
- P deteriorates the toughness of the heat-treated steel material. For this reason, the lower the P content, the better. In particular, when the P content exceeds 0.05%, the toughness is significantly reduced. Therefore, the P content is 0.05% or less.
- the P content is preferably 0.005% or less.
- S is not an essential element but is contained as an impurity in steel, for example. S deteriorates the toughness of the heat-treated steel material. For this reason, the lower the S content, the better. In particular, when the S content exceeds 0.05%, the toughness is markedly reduced. Therefore, the S content is 0.05% or less.
- the S content is preferably 0.02% or less.
- N (N: 0.01% or less) N is not an essential element but is contained as an impurity in steel, for example. N contributes to the formation of coarse nitrides and deteriorates the local deformability and toughness of the heat-treated steel. For this reason, the lower the N content, the better. In particular, when the N content exceeds 0.01%, the local deformability and toughness are significantly reduced. Therefore, the N content is 0.01% or less. Note that considerable cost is required to reduce the N content to less than 0.0008%, and enormous cost may be required to reduce the N content to less than 0.0002%.
- Ni, Cu, Mo, V, Al, Nb, and REM are not essential elements, but are optional elements that may be appropriately contained in steel plates for heat treatment and heat treated steel materials up to a predetermined amount.
- Ni, Cu, Mo, V, Al, Nb, and REM have an effect of improving the hardenability and / or toughness of the steel sheet for heat treatment. Therefore, 1 type selected from the group which consists of these elements, or arbitrary combinations may contain. However, if the Ni content exceeds 2.0%, the effect of the above action is saturated, and the cost only increases. Therefore, the Ni content is 2.0% or less. If the Cu content exceeds 1.0%, the effect of the above action is saturated, and the cost simply increases.
- the Cu content is 1.0% or less. If the Mo content exceeds 1.0%, the effect of the above action is saturated, and the cost simply increases. Therefore, the Mo content is 1.0% or less. If the V content exceeds 1.0%, the effect of the above action is saturated, and the cost only increases. Therefore, the V content is 1.0% or less. If the Al content exceeds 1.0%, the effect of the above action is saturated, and the cost only increases. Therefore, the Al content is 1.0% or less. When the Nb content exceeds 1.0%, the effect of the above action is saturated, and the cost is simply increased. Therefore, the Nb content is 1.0% or less. When the REM content exceeds 0.1%, the effect of the above action is saturated, and the cost is simply increased. Therefore, the REM content is 0.1% or less.
- the Ni content, the Cu content, the Mo content and the V content are all preferably 0.1% or more, and the Al content and the Nb content are either Is preferably 0.01% or more, and the REM content is preferably 0.001% or more. That is, “Ni: 0.1% to 2.0%”, “Cu: 0.1% to 1.0%”, “Mo: 0.1% to 1.0%”, “V: 0.1 % To 1.0% “,” Al: 0.01% to 1.0% “,” Nb: 0.01% to 1.0% “, or” REM: 0.001% to 0.1% " Or any combination thereof is preferably satisfied.
- REM is added to the molten steel using, for example, an Fe—Si—REM alloy, which includes, for example, Ce, La, Nd, Pr.
- the heat-treated steel material according to the present embodiment has a structure represented by residual austenite: 1.5% by volume or less and the balance: martensite.
- the martensite is, for example, autotempered martensite, but is not limited to autotempered martensite.
- Residual austenite 1.5% by volume or less
- Residual austenite is inevitably contained in the structure of the heat-treated steel material, not the essential structure. And as mentioned above, a retained austenite causes the fall of yield strength, and the yield strength becomes low, so that the volume ratio of a retained austenite is high. Particularly, when the retained austenite exceeds 1.5% by volume, the yield strength is remarkably lowered, and it becomes difficult to apply the heat-treated steel material to a bumper reinforcement, a center pillar, and the like. Therefore, the volume ratio of retained austenite is 1.5% by volume or less.
- the heat-treated steel material according to the present embodiment preferably has mechanical characteristics represented by a yield ratio: 0.70 or more.
- the impact resistance characteristics can be evaluated by the tensile strength and the yield strength and toughness corresponding to the tensile strength, and the yield strength corresponding to the tensile strength is represented by a yield ratio. And if tensile strength or yield strength is comparable, it is preferable that a yield ratio is high. When the yield ratio is less than 0.70, sufficient impact resistance characteristics may not be obtained when used for bumper reinforcement or center pillar. Therefore, the yield ratio is preferably 0.70 or more.
- the steel plate for heat treatment is heated to a temperature range of Ac 3 points or higher, then cooled to the Ms point at a cooling rate equal to or higher than the critical cooling rate, and then 35 ° C. from the Ms point to 100 ° C. Cool at an average cooling rate of at least / sec.
- the structure becomes an austenite single phase. Thereafter, when cooling to the Ms point at a cooling rate equal to or higher than the critical cooling rate, the austenite single phase structure is maintained without causing diffusion transformation. Thereafter, when cooling from the Ms point to 100 ° C. at an average cooling rate of 35 ° C./second or more, a volume ratio of residual austenite is 1.5 volume% or less and the balance is martensite.
- hot forming such as hot stamping may be performed. That is, the steel plate for heat treatment may be formed with a mold during the period from heating to a temperature range of Ac 3 points or higher until the temperature reaches the Ms point.
- hot forming include bending, drawing, overhang forming, hole expansion forming, and flange forming. These belong to press forming, but hot forming other than press forming such as roll forming may be performed if the steel sheet can be cooled in parallel with hot forming or immediately after hot forming. .
- a cooling medium pipe and a jet hole are provided in the mold, and the cooling medium is heat-treated during the cooling from the Ms point to 100 ° C., for example, during holding at the press bottom dead center. It is preferable to spray directly on the steel plate.
- the cooling medium include water, polyhydric alcohols, polyhydric alcohol aqueous solutions, polyglycol, mineral oil having a flash point of 120 ° C. or higher, synthetic ester, silicon oil, fluorine oil, grease having a dropping point of 120 ° C. or higher, mineral Examples are water emulsions in which surfactants are blended with oils and synthetic esters. These 1 type or arbitrary 2 or more types of combinations can be used.
- the holding time in a temperature range of Ac 3 points or higher is preferably 1 minute or longer in order to sufficiently cause transformation to austenite.
- the holding time is preferably 10 minutes or less.
- the steel plate for heat treatment may be a hot rolled steel plate or a cold rolled steel plate.
- An annealed hot rolled steel sheet or an annealed cold rolled steel sheet obtained by annealing a hot rolled steel sheet or a cold rolled steel sheet may be used as a steel sheet for heat treatment.
- the steel plate for heat treatment may be a surface-treated steel plate such as a plated steel plate. That is, the plating layer may be provided on the steel plate for heat treatment.
- the plating layer contributes to, for example, improvement of corrosion resistance.
- the plating layer may be an electroplating layer or a hot dipping layer. Examples of the electroplating layer include an electrogalvanizing layer and an electro Zn—Ni alloy plating layer.
- the hot dip galvanized layer includes hot dip galvanized layer, alloyed hot dip galvanized layer, hot dip aluminum plated layer, hot dip Zn-Al alloy plated layer, hot dip Zn-Al-Mg alloy plated layer, hot dip Zn-Al-Mg-Si alloy.
- a plating layer etc. are illustrated.
- the adhesion amount of the plating layer is not particularly limited, and is, for example, an adhesion amount within a general range.
- the heat treatment steel material may be provided with a plating layer.
- hot rolling is performed by setting the temperature of the steel ingot or steel slab having the above chemical composition to 1050 ° C. or higher, and then winding is performed in a temperature range of 400 ° C. or higher and 700 ° C. or lower.
- the steel ingot or slab may contain non-metallic inclusions that cause deterioration in the toughness and local deformability of the heat-treated steel obtained by quenching the heat-treated steel sheet. Therefore, when the steel ingot or steel slab is subjected to hot rolling, it is preferable to sufficiently dissolve these nonmetallic inclusions. If the steel ingot or steel slab having the above chemical composition is 1050 ° C. or higher when subjected to hot rolling, solid solution of the nonmetallic inclusions is promoted. Therefore, the temperature of the steel ingot or steel slab used for hot rolling is preferably 1050 ° C. or higher. The temperature of the steel ingot or steel slab may be 1050 ° C. or higher when subjected to hot rolling.
- the steel ingot or steel slab that has become less than 1050 ° C. after continuous casting or the like may be heated to 1050 ° C. or more, and the steel ingot after continuous casting or the steel slab after ingot rolling is reduced to less than 1050 ° C. You may use for hot rolling, without.
- a high ferrite area ratio can be obtained by setting the coiling temperature to 400 ° C. or higher.
- the higher the ferrite area ratio the more the strength of the hot-rolled steel sheet obtained by hot rolling can be suppressed. Therefore, it becomes easier to control the load and the flatness and thickness of the steel sheet when cold rolling is performed later. Will improve. Therefore, the winding temperature is preferably 400 ° C. or higher.
- the winding temperature is set to 700 ° C. or lower, scale growth after winding is suppressed, and generation of scale wrinkles is suppressed.
- the winding temperature is preferably 700 ° C. or lower.
- Pickling may be performed according to a conventional method.
- Skin pass rolling may be performed before or after pickling.
- skin pass rolling for example, flatness is corrected or scale peeling is promoted.
- the elongation percentage when performing skin pass rolling is not particularly limited, and is, for example, 0.3% or more and 3.0% or less.
- cold-rolling of the pickled steel sheet obtained by pickling is performed.
- Cold rolling may be performed according to a conventional method.
- the rolling reduction of cold rolling is not particularly limited, and is a rolling reduction within a normal range, for example, 30% or more and 80% or less.
- the hot-rolled steel sheet or the cold-rolled steel sheet is annealed.
- annealing for example, a hot-rolled steel sheet or a cold-rolled steel sheet is held in a temperature range of 550 ° C. or higher and 950 ° C. or lower.
- the temperature maintained by annealing is preferably 550 ° C. or higher.
- the temperature maintained by annealing exceeds 950 ° C.
- the structure may become coarse.
- the coarsening of the structure may reduce the toughness after quenching.
- the temperature maintained by annealing is preferably 950 ° C. or less.
- an average cooling rate 3 ° C./second or more
- generation of coarse pearlite and coarse cementite is suppressed, and the properties after quenching can be improved.
- the average cooling rate 20 ° C./second or less, it becomes easy to suppress the occurrence of unevenness in strength and stabilize the material of the annealed hot-rolled steel sheet or the annealed cold-rolled steel sheet.
- an electroplating process or a hot dipping process is performed. Both the electroplating process and the hot dipping process may be performed according to a conventional method.
- the continuous hot dip galvanizing equipment may be used to perform the plating process continuously following the above annealing. Moreover, you may perform a plating process independently from said annealing.
- an alloying process may be performed to form an alloyed hot dip galvanized layer.
- the alloying treatment temperature is preferably 480 ° C. or more and 600 ° C. or less. By setting the alloying treatment temperature to 480 ° C.
- Skin pass rolling may be performed after the hot dip galvanizing treatment. For example, flatness is corrected by skin pass rolling.
- the elongation rate in the case of performing skin pass rolling is not particularly limited, and may be the same elongation rate as in a conventional method.
- a sample having a thickness of 1.4 mm, a width of 30 mm, and a length of 200 mm was prepared, and the samples were subjected to heat treatment (heating and cooling) under the conditions shown in Table 2.
- This heat treatment simulates the heat treatment in hot forming. Heating in this experiment was performed by energization heating. After the heat treatment, a soaking part was cut out from the sample, and this soaking part was subjected to an X-ray diffraction test, a tensile test and a Charpy impact test.
- the cooling rate to the Ms point 80 ° C./second) is equal to or higher than the critical cooling rate.
- a portion of the soaking part having a depth from the surface to 1/8 of the thickness is chemically polished using hydrofluoric acid and hydrogen peroxide, and the test for the X-ray diffraction test A piece was prepared, and the volume ratio (volume%) of retained austenite (residual ⁇ ) in the test piece was determined. The balance of retained austenite was martensite.
- the soaking part was processed into an ASTM E8 half-size plate-shaped test piece having a thickness of 1.2 mm, and the tensile test and the yield strength were measured by performing a tensile test on the test piece.
- the length of the parallel part of this half-size plate-shaped test piece is 32 mm, and the width of the parallel part is 6.25 mm.
- the yield ratio was calculated from the tensile strength and the yield strength.
- the soaked part was ground to a thickness of 1.2 mm, and a V-notched test piece was prepared by laminating three of them, and the Charpy impact test was performed on the test piece at ⁇ 80 ° C. The impact value was determined.
- the average cooling rate from the Ms point to 100 ° C. was 35 ° C./s or more, and the manufacturing conditions were within the scope of the present invention, so the desired structure was obtained.
- the average cooling rate from the Ms point to 100 ° C. was less than 35 ° C./s, and the manufacturing conditions were out of the scope of the present invention, so the desired structure was not obtained.
- the present invention can be used, for example, in the manufacturing and use industries of heat treatment members used in automobiles such as bumper reinforcements and center pillars.
- the present invention can also be used in other industries such as manufacturing and using industries of machine structural parts.
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Abstract
Description
質量%で、
C:0.16%~0.38%、
Mn:0.6%~1.5%、
Cr:0.4%~2.0%、
Ti:0.01%~0.10%、
B:0.001%~0.010%、
Si:0.20%以下、
P:0.05%以下、
S:0.05%以下、
N:0.01%以下、
Ni:0%~2.0%、
Cu:0%~1.0%、
Mo:0%~1.0%、
V:0%~1.0%、
Al:0%~1.0%、
Nb:0%~1.0%、
REM:0%~0.1%、
残部:Fe及び不純物
で表される化学組成を有し、
残留オーステナイト:1.5体積%以下、
残部:マルテンサイト
で表される組織を有することを特徴とする熱処理鋼材。
前記化学組成において、C:0.16~0.25%であることを特徴とする(1)に記載の熱処理鋼材。
降伏比:0.70以上
で表される機械特性を有することを特徴とする(1)又は(2)に記載の熱処理鋼材。
前記化学組成において、
Ni:0.1%~2.0%、
Cu:0.1%~1.0%、
Mo:0.1%~1.0%、
V:0.1%~1.0%、
Al:0.01%~1.0%、
Nb:0.01%~1.0%、若しくは
REM:0.001%~0.1%、
又はこれらの任意の組み合わせが成り立つことを特徴とする(1)~(3)のいずれかに記載の熱処理鋼材。
鋼板をAc3点以上の温度域に加熱する工程と、
次いで、前記鋼板を臨界冷却速度以上の冷却速度でMs点まで冷却する工程と、
次いで、前記鋼板をMs点から100℃まで35℃/秒以上の平均冷却速度で冷却する工程と、
を有し、
前記鋼板は、
質量%で、
C:0.16%~0.38%、
Mn:0.6%~1.5%、
Cr:0.4%~2.0%、
Ti:0.01%~0.10%、
B:0.001%~0.010%、
Si:0.20%以下、
P:0.05%以下、
S:0.05%以下、
N:0.01%以下、
Ni:0%~2.0%、
Cu:0%~1.0%、
Mo:0%~1.0%、
V:0%~1.0%、
Al:0%~1.0%、
Nb:0%~1.0%、
REM:0%~0.1%、
残部:Fe及び不純物
で表される化学組成を有することを特徴とする熱処理鋼材の製造方法。
前記化学組成において、C:0.16~0.25%であることを特徴とする(5)に記載の熱処理鋼材の製造方法。
前記化学組成において、
Ni:0.1%~2.0%、
Cu:0.1%~1.0%、
Mo:0.1%~1.0%、
V:0.1%~1.0%、
Al:0.01%~1.0%、
Nb:0.01%~1.0%、若しくは
REM:0.001%~0.1%、
又はこれらの任意の組み合わせが成り立つことを特徴とする(5)又は(6)に記載の熱処理鋼材の製造方法。
前記鋼板をAc3点以上の温度域に加熱してから前記鋼板の温度がMs点に達するまでの間に成形を行う工程を有することを特徴とする(5)~(7)のいずれかに記載の熱処理鋼材の製造方法。
Cは、熱処理用の鋼板の焼入れ性を高め、熱処理鋼材の強度を主に決定する非常に重要な元素である。C含有量が0.16%未満では、熱処理鋼材の強度が十分なものとならない。従って、C含有量は0.16%以上とする。C含有量が0.38%超では、熱処理鋼材の強度が高くなり過ぎて、靱性の劣化が著しくなる。従って、C含有量は0.36%以下とする。C含有量は好ましくは0.36%以下である。
Mnは、熱処理用の鋼板の焼入れ性を向上し、熱処理鋼材の強度の安定した確保を可能にする作用を有する。Mn含有量が0.6%未満では、上記作用による効果が十分には得られないことがある。従って、Mn含有量は0.6%以上とする。Mn含有量が1.5%超では、偏析が著しくなるため、機械的特性の均一性が低下し、靱性が劣化する。従って、Mn含有量は1.5%以下とする。Mn含有量は好ましくは1.3%以下である。
Crは、熱処理用の鋼板の焼入れ性を向上し、熱処理鋼材の強度の安定した確保を可能にする作用を有する。Cr含有量が0.4%未満では、上記作用による効果が十分には得られないことがある。従って、Cr含有量は0.4%以上とする。Cr含有量が2.0%超では、Crが熱処理用の鋼板中の炭化物に濃化して、焼入れ性が低下する。Crの濃化に伴って、焼入れのための加熱の際に炭化物の固溶が遅延するためである。従って、Cr含有量は2.0%以下とする。Cr含有量は好ましくは1.0%以下である。
Tiは、熱処理鋼材の靱性を大きく向上させる作用を有する。すなわち、Tiは、焼入れのためのAc3点以上の温度での熱処理の際に、再結晶を抑制し、更に微細な炭化物を形成してオーステナイトの粒成長を抑制する。粒成長の抑制により、細かいオーステナイト粒が得られ、靱性が大きく向上する。Tiは、熱処理用の鋼板中のNと優先的に結合することで、BNの析出によりBが消費されることを抑制するという作用も有する。後述のように、Bは焼入れ性を向上する作用を有するため、Bの消費の抑制により、Bによる焼入れ性の向上の効果を確実に得ることができる。Ti含有量が0.01%未満では、上記作用による効果が十分には得られないことがある。従って、Ti含有量は0.01%以上とする。Ti含有量が0.10%超では、TiCの析出量が増加してCが消費されるため、十分な強度が得られないことがある。従って、Tiの含有量は0.10%以下とする。Ti含有量は好ましくは0.08%以下である。
Bは、熱処理用の鋼板の焼入れ性を著しく高める作用を有する非常に重要な元素である。Bは、粒界に偏析することで、粒界を強化して靱性を高める作用も有する。Bは、Tiと同様に、オーステナイトの粒成長を抑制して靱性を向上する作用も有する。B含有量が0.001%未満では、上記作用による効果が十分には得られないことがある。従って、B含有量は0.001%以上とする。B含有量が0.010%超では、粗大な硼化物が多く析出し、靱性が劣化する。従って、B含有量は0.010%以下とする。B含有量は好ましくは0.006%以下である。
Siは、必須元素ではなく、例えば鋼中に不純物として含有される。Siは、残留オーステナイトの増加に伴う降伏強度の低下を引き起こす。また、Si含有量が高いほど、オーステナイト変態が生じる温度が高くなる。この温度が高いほど、焼入れのための加熱に要するコストが上昇したり、加熱不足に伴う焼入れ不足が生じやすくなったりする。更に、Si含有量が高いほど、熱処理用の鋼板のぬれ性及び合金化処理性が低下するため、溶融めっき処理及び合金化処理の安定性が低下する。このため、Si含有量は低ければ低いほどよい。特にSi含有量が0.20%超で、降伏強度の低下が顕著となる。従って、Si含有量は0.20%以下とする。Si含有量は好ましくは0.15%以下である。
Pは、必須元素ではなく、例えば鋼中に不純物として含有される。Pは、熱処理鋼材の靱性を劣化させる。このため、P含有量は低ければ低いほどよい。特にP含有量が0.05%超で、靱性の低下が顕著となる。従って、P含有量は0.05%以下とする。P含有量は好ましくは0.005%以下である。
Sは、必須元素ではなく、例えば鋼中に不純物として含有される。Sは、熱処理鋼材の靱性を劣化させる。このため、S含有量は低ければ低いほどよい。特にS含有量が0.05%超で、靱性の低下が顕著となる。従って、S含有量は0.05%以下とする。S含有量は好ましくは0.02%以下である。
Nは、必須元素ではなく、例えば鋼中に不純物として含有される。Nは、粗大な窒化物の形成に寄与し、熱処理鋼材の局部変形能及び靭性を劣化させる。このため、N含有量は低ければ低いほどよい。特にN含有量が0.01%超で、局部変形能及び靱性の低下が顕著となる。従って、N含有量は0.01%以下とする。なお、N含有量を0.0008%未満まで低下させるためには相当なコストを要し、0.0002%未満まで低下させるためには更に莫大なコストを要することがある。
Ni、Cu、Mo、V、Al、Nb及びREMは、熱処理用の鋼板の焼入れ性及び/又は靱性を向上する作用を有する。従って、これらの元素からなる群から選択された1種又は任意の組み合わせが含有されていてもよい。しかし、Ni含有量が2.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、Ni含有量は2.0%以下とする。Cu含有量が1.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、Cu含有量は1.0%以下とする。Mo含有量が1.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、Mo含有量は1.0%以下とする。V含有量が1.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、V含有量は1.0%以下とする。Al含有量が1.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、Al含有量は1.0%以下とする。Nb含有量が1.0%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、Nb含有量は1.0%以下とする。REM含有量が0.1%超では、上記作用による効果が飽和し、徒にコストが上昇するだけである。従って、REM含有量は0.1%以下とする。上記作用による効果を確実に得るために、Ni含有量、Cu含有量、Mo含有量及びV含有量は、いずれも好ましくは0.1%以上であり、Al含有量及びNb含有量は、いずれも好ましくは0.01%以上であり、REM含有量は好ましくは0.001%以上である。つまり、「Ni:0.1%~2.0%」、「Cu:0.1%~1.0%」、「Mo:0.1%~1.0%」、「V:0.1%~1.0%」、「Al:0.01%~1.0%」、「Nb:0.01%~1.0%」、若しくは「REM:0.001%~0.1%」、又はこれらの任意の組み合わせが満たされることが好ましい。REMは、例えばFe-Si-REM合金を使用して溶鋼に添加され、この合金には、例えば、Ce、La、Nd、Prが含まれる。
残留オーステナイトは、必須の組織ではなく、熱処理鋼材の組織に不可避的に含まれてしまう。そして、上記のように、残留オーステナイトは降伏強度の低下を引き起こし、残留オーステナイトの体積率が高いほど降伏強度が低くなる。特に残留オーステナイトが1.5体積%超で、降伏強度の低下が顕著となり、熱処理鋼材のバンパーレインフォース及びセンターピラー等への適用が困難となる。従って、残留オーステナイトの体積率は1.5体積%以下とする。
第1の実験では、表1に示す化学組成を有する厚さが1.4mmの冷延鋼板を熱処理用鋼板として製造した。これらの鋼板は、実験室にて溶製したスラブの熱間圧延及び冷間圧延により製造した。表1中の下線は、その数値が本発明の範囲から外れていることを示す。
第2の実験では、表3に示す化学組成を有する厚さが1.4mmの冷延鋼板を熱処理用鋼板として製造した。これらの鋼板は、実験室にて溶製したスラブの熱間圧延及び冷間圧延により製造した。表3中の下線は、その数値が本発明の範囲から外れていることを示す。
Claims (8)
- 質量%で、
C:0.16%~0.38%、
Mn:0.6%~1.5%、
Cr:0.4%~2.0%、
Ti:0.01%~0.10%、
B:0.001%~0.010%、
Si:0.20%以下、
P:0.05%以下、
S:0.05%以下、
N:0.01%以下、
Ni:0%~2.0%、
Cu:0%~1.0%、
Mo:0%~1.0%、
V:0%~1.0%、
Al:0%~1.0%、
Nb:0%~1.0%、
REM:0%~0.1%、
残部:Fe及び不純物
で表される化学組成を有し、
残留オーステナイト:1.5体積%以下、
残部:マルテンサイト
で表される組織を有することを特徴とする熱処理鋼材。 - 前記化学組成において、C:0.16~0.25%であることを特徴とする請求項1に記載の熱処理鋼材。
- 降伏比:0.70以上
で表される機械特性を有することを特徴とする請求項1又は2に記載の熱処理鋼材。 - 前記化学組成において、
Ni:0.1%~2.0%、
Cu:0.1%~1.0%、
Mo:0.1%~1.0%、
V:0.1%~1.0%、
Al:0.01%~1.0%、
Nb:0.01%~1.0%、若しくは
REM:0.001%~0.1%、
又はこれらの任意の組み合わせが成り立つことを特徴とする請求項1乃至3のいずれか1項に記載の熱処理鋼材。 - 鋼板をAc3点以上の温度域に加熱する工程と、
次いで、前記鋼板を臨界冷却速度以上の冷却速度でMs点まで冷却する工程と、
次いで、前記鋼板をMs点から100℃まで35℃/秒以上の平均冷却速度で冷却する工程と、
を有し、
前記鋼板は、
質量%で、
C:0.16%~0.38%、
Mn:0.6%~1.5%、
Cr:0.4%~2.0%、
Ti:0.01%~0.10%、
B:0.001%~0.010%、
Si:0.20%以下、
P:0.05%以下、
S:0.05%以下、
N:0.01%以下、
Ni:0%~2.0%、
Cu:0%~1.0%、
Mo:0%~1.0%、
V:0%~1.0%、
Al:0%~1.0%、
Nb:0%~1.0%、
REM:0%~0.1%、
残部:Fe及び不純物
で表される化学組成を有することを特徴とする熱処理鋼材の製造方法。 - 前記化学組成において、C:0.16~0.25%であることを特徴とする請求項5に記載の熱処理鋼材の製造方法。
- 前記化学組成において、
Ni:0.1%~2.0%、
Cu:0.1%~1.0%、
Mo:0.1%~1.0%、
V:0.1%~1.0%、
Al:0.01%~1.0%、
Nb:0.01%~1.0%、若しくは
REM:0.001%~0.1%、
又はこれらの任意の組み合わせが成り立つことを特徴とする請求項5又は6に記載の熱処理鋼材の製造方法。 - 前記鋼板をAc3点以上の温度域に加熱してから前記鋼板の温度がMs点に達するまでの間に成形を行う工程を有することを特徴とする請求項5乃至7のいずれか1項に記載の熱処理鋼材の製造方法。
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JP2021508767A (ja) * | 2017-12-19 | 2021-03-11 | アルセロールミタル | 被覆鋼基材 |
JP7162663B2 (ja) | 2017-12-19 | 2022-10-28 | アルセロールミタル | 被覆鋼基材 |
JP2022550142A (ja) * | 2019-12-18 | 2022-11-30 | ポスコ | アルミニウム合金めっき鋼板、熱間成形部材及びこれらの製造方法 |
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ES2744909T3 (es) | 2020-02-26 |
CN105324502A (zh) | 2016-02-10 |
CA2913487A1 (en) | 2014-12-11 |
MX2015016224A (es) | 2016-03-01 |
PL3006586T3 (pl) | 2019-12-31 |
CA2913487C (en) | 2018-12-04 |
RU2653032C2 (ru) | 2018-05-04 |
US20160102380A1 (en) | 2016-04-14 |
JPWO2014196645A1 (ja) | 2017-02-23 |
EP3006586A4 (en) | 2017-03-08 |
KR20160003263A (ko) | 2016-01-08 |
TWI551697B (zh) | 2016-10-01 |
US10435761B2 (en) | 2019-10-08 |
EP3006586A1 (en) | 2016-04-13 |
TW201504457A (zh) | 2015-02-01 |
RU2015150123A (ru) | 2017-07-14 |
BR112015030008A2 (pt) | 2017-07-25 |
JP6202096B2 (ja) | 2017-09-27 |
EP3006586B1 (en) | 2019-07-31 |
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