EP2762577A1 - Preparation method of steel product having different strengths using laser heat treatment, and heat hardened steel used therein - Google Patents
Preparation method of steel product having different strengths using laser heat treatment, and heat hardened steel used therein Download PDFInfo
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- EP2762577A1 EP2762577A1 EP11873399.7A EP11873399A EP2762577A1 EP 2762577 A1 EP2762577 A1 EP 2762577A1 EP 11873399 A EP11873399 A EP 11873399A EP 2762577 A1 EP2762577 A1 EP 2762577A1
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- Prior art keywords
- heat treatment
- less
- laser
- plating layer
- steel
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 229910000760 Hardened steel Inorganic materials 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 24
- 238000007747 plating Methods 0.000 claims description 22
- 239000011651 chromium Substances 0.000 claims description 18
- 239000011572 manganese Substances 0.000 claims description 16
- 239000010936 titanium Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 11
- 229910052796 boron Inorganic materials 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000005728 strengthening Methods 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 239000011593 sulfur Substances 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 229910018125 Al-Si Inorganic materials 0.000 claims description 4
- 229910018520 Al—Si Inorganic materials 0.000 claims description 4
- 229910007570 Zn-Al Inorganic materials 0.000 claims description 4
- 229910007567 Zn-Ni Inorganic materials 0.000 claims description 4
- 229910007614 Zn—Ni Inorganic materials 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- VRDIULHPQTYCLN-UHFFFAOYSA-N Prothionamide Chemical compound CCCC1=CC(C(N)=S)=CC=N1 VRDIULHPQTYCLN-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
-
- 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
- C21D2221/00—Treating localised areas of an article
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12674—Ge- or Si-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12937—Co- or Ni-base component next to Fe-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
- The present invention relates to a method for manufacturing a steel product such as seat frames and bumper back beams for automobiles, and more particularly a method for manufacturing a steel product with different strengths using laser heat treatment and heat treated hardened steel using thereof.
- Recently, components for automobiles are becoming lighter and stronger for improving fuel efficiency. The lighter and stronger components are realized through process such as alloying constituent of materials, heat treatment, etc.
- Recently, hot stamping technology was developed in accordance with the growth of production technology for automobile components. Hot stamping technology is a technology that can produce high strength components with tensile strength of over 1000 MPa by heating a material with a tensile strength of about 500 MPa to about 900 °C and forming into a desired shape and at the same time cooled rapidly to form martensite in micro-structures.
- Korean Patent Laid-open Publication No.
10-2009-0086970 (published on August 14, 2009 10-0765723 (published on October 11, 2007 - But, as described in the publications above, hot stamping technology is used only for strengthening an entire material, and is difficult to apply to partial strengthening.
- Meanwhile, Korean Patent Laid-open Publication No.
10-2011-0062428 (published on June 10, 2011 - An aspect of the present invention is to provide a method for manufacturing a steel product with different strengths using a single material without a separate pre-process.
- Another aspect of the present invention is to provide a heat treated hardened steel which may be applied to the steel production method.
- In accordance with an embodiment of the present invention to achieve the technical problem, a method for manufacturing a steel product comprising : (a) preparing a material comprising: by weight %, 0.1 ∼ 0.5% of carbon (C) ; 0.1 ∼ 0.5% of silicon (Si); 0.5 ∼ 3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01 ∼ 1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005 ∼ 0.08% of boron (B); and the balance of Fe and unavoidable impurities; (b) producing a formed body by forming the material into a predetermined shape; and (c) performing laser heat treatment to a part requiring high strength (high strength part) in the formed body, and locally strengthening the high strength part.
- In accordance with an embodiment of the present invention to achieve another technical problem, a heat treated hardened steel comprising : by weight %, 0.1 ∼ 0.5% of carbon (C) ; 0.1 ∼ 0.5% of silicon (Si); 0.5 - 3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01 - 1.0% of chromium (Cr); 0.1 % or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005 - 0.08% of boron (B); and the balance of Fe and unavoidable impurities; having a tensile strength of 400 - 990MPa and an elongation of 10 - 40% before heat treatment, and having a tensile strength of 1200 - 1900MPa and an elongation of 1 ∼ 13% after heat treatment.
- A layer selected from Al plating layer, Al-Si plating layer, Zn-Ni plating layer, Zn plating layer, Zn-Al plating layer and high-temperature oxidation-resistant resin coating layer may be formed on the surface of the steel.
- According to a method for manufacturing a steel product in accordance with the present invention, a local strengthening of a single material without a pre-process is possible by using laser heat treatment. Therefore, production method for steel products in accordance with the present invention may be applied for producing seat frames, bumper back beams, etc. for automobiles that require tensile strength.
- Also, the method for manufacturing a steel product in accordance with the present invention may pursue weight reduction because higher strength is possible through laser heat treatment and reinforcement may be omitted.
-
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Figure 1 is a flow chart showing an outline of a method for manufacturing a steel product according to an embodiment of the present invention. -
Figure 2 is a view showing an example of a laser heat treatment applied to the present invention. - Advantages, features, and methods to achieve them will be apparent with reference to the exemplary embodiments and drawings that follow. It should be understood that the present invention is not limited to the following embodiments and may be embodied in different ways, and that the embodiments are given to provide complete disclosure of the invention and to provide thorough understanding of the invention to those skilled in the art. The scope of the invention is limited only by the accompanying claims and equivalents thereof.
- Hereinafter, a method for manufacturing a steel product with different strengths using laser heat treatment and heat treated hardened steel used therein in accordance with the present invention will now be described in detail.
-
FIG. 1 is a flow chart showing an outline of a method for manufacturing a steel product according to an embodiment of the present invention. - Referring to
FIG. 1 , a method for manufacturing a steel product comprises preparing material (S110), producing a formed body (S120), and laser heat treatment (S 130). - A material comprising: by weight %, 0.1 ∼ 0.5% of carbon (C) ; 0.1 ∼ 0.5% of silicon (Si); 0.5 ∼ 3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01 ∼ 1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005 ∼ 0.08% of boron (B); and the balance of Fe and unavoidable impurities are prepared in the preparing material step.
- Also, the material may be in a blank shape, and hot rolled steel or cold rolled steel may be used.
- Also, a layer selected from Al plating layer, Al-Si plating layer, Zn-Ni plating layer, Zn plating layer, Zn-Al plating layer and high-temperature oxidation-resistant resin coating layer may be formed on the surface of the material to prevent surface oxidization or decarbonization during laser heat treatment process.
- Meanwhile, preparing heat treated hardened steel, which has a certain level of strength, has an excellent formability, and may have super high strength through heat treatment is preferable.
- For a heat treated hardened steel with the proposed composition, a tensile strength of 400 - 990MPa and an elongation of 10 - 40% is obtainable through slab reheating, hot rolling higher than Ar3 and a normal hot rolling process applying a coiling temperature of about 500 - 600°C applied or a normal cold rolling process applying a annealing temperature of about 600 - 900°C.
- Also, heat treated hardened steel with the composition has boron (B) added. Therefore, heat treated hardened steel with the composition may have a tensile strength of 1200 - 1900MPa and an elongation of 1 ∼ 13% through heat treatment.
- Hereinafter, contents of each component and reason for addition is described for the heat treated hardened steel in accordance with the present invention.
- Carbon (C) is added to obtain the strength of the steel. Also, carbon plays a role of stabilizing austenite according to an amount of austenite concentration. Adding the carbon of 0.1 ∼ 0.5 wt% based on the total weight of the steel is preferable. When amount of carbon is less than 0.1 wt%, it is difficult to obtain sufficient strength. On the contrary, when amount of carbon is greater than 0.5 wt%, strength is increased but weldability may greatly decline.
- Silicon acts as a deoxidizer, and contributes to improving the strength of steel through solution strengthening. Adding the silicon of 0.1 ∼ 0.5 wt% based on the total weight of the steel is preferable. When amount of silicon is less than 0.1 I wt%, the effect of addition is insufficient. On the contrary, when amount of silicon is greater than 0.5 wt%, weldability and plating characteristics may greatly decline.
- Manganese (Mn) contributes to improving strength through austenite stabilization.
- Adding the manganes of 0.5 - 3.0 wt% based on the total weight of the steel is preferable. When amount of manganes is less than 0.5 wt%, the effect of addition is insufficient. On the contrary, when amount of manganese is greater than 3.0 wt%, problems of weldability declining and toughness degradation occur.
- Phosphorus (P) contributes to improving strength, but when added excessively, quality of material is degraded through segregation and weldability may decline. As such, content of phosphorus is limited to 0.1wt% or less based on the total weight of the steel.
- Also, sulfur (S) contributes partially to improving machinability, but when added excessively, problem of excessive formation of MnS inclusion occurs. Therefore, content of sulfur is limited to 0.05 wt% or less based on the total weight of the steel.
- Chromium (Cr) improves elongation by stabilizing ferrite grain, and contributes to improving strength through stabilizing austenite by improving the carbon in austenite concentration.
- Adding the chromium of 0.01 - 1.0 wt% based on the total weight of the steel is preferable. When amount of chromium is less than 0.01 wt%, the effect of addition is insufficient. On the contrary, when amount of chromium is greater than 1.0 wt%, problem of plating characteristics declining may occur.
- Aluminum (Al) acts as preventing hydrogen embrittlement, and is effective for improving ductility and coatability. But, when aluminum is added greater than 0.1 wt%, excessive inclusion is formed and ductility and toughness of steel may be hindered.
- Therefore, adding aluminum of 0.1 wt% or less based on the total weight of the steel is preferable.
- Titanium (Ti) is a carbonitride forming element, and contributes to improving strength. But, when titanium is added greater than 0.2 wt%, toughness may be hindered.
- Therefore, adding titanium of 0.2 wt% or less based on the total weight of the steel is preferable.
- Boron (B) is a strong hardening property element, and contributes to super hardening of steel after heat treatment by only adding 0.0005 wt%.
- Adding the boron of 0.0005 - 0.08 wt% based on the total weight of the steel is preferable. When amount of boron is less than 0.0005 wt%, the effect of addition is insufficient. On the contrary, when amount of boron is greater than 0.08 wt%, problem of toughness being greatly hindered due to excessive increase in hardening property occur.
- Next, a formed body is produced by forming the material in a predetermined shape in the producing a formed body shape (S120).
- Cold forming, etc. may be used for forming.
- Meanwhile, all of the forming need not be done in this step (S120), and a protion of forming such as trimming, piercing, etc. may be done after laser heat treatment.
- Next, laser heat treatment is performed to a part requiring high strength (high strength part) in the formed body, and the high strength part is locally strengthened.
- Here, high strength part may be a part where stress is concentrated such as a center part of a back beam of a bumper for automobiles, a part where stress is concentrated such as a rail, base, recliner, or arm applied to seat frames, etc.
- Laser heat treatment may be carried out by irradiating a laser such as a diode laser on a high strength part and locally heating the high strength part to a temperature higher than Ac3, about Ac3 + 200 °C, and then cooling to a temperature lower than Ms, about Ms - Ms - 200°C.
- Cooling at a cooling rate of 5 - 300°C/sec is preferable. When cooling rate is slower than 5 °C/sec, obtaining sufficient strength is difficult. On the contrary, when cooling rate is faster than 300 °C/sec, obtaining sufficient toughness and ductility is difficult.
- In laser heat treatment, laser irradiating time and laser strength is adjusted for tensile strength of a high strength part is 1200 - 1900MPa. For example, laser irradiating time may be increased or laser strength may be increased for tensile strength of a high strength part to be about 1900 MPa. On the contrary, laser irradiating time may be relatively decreased or laser strength may be relatively decreased for tensile strength of a high strength part to be about 1200 MPa.
- That is, laser irradiating time and laser strength in laser heat treatment may differ according to target strength of a high strength part. Also, laser irradiating time and laser strength may differ according to the laser irradiating device used for laser heat treatment.
-
FIG. 2 is a view showing an example of a laser heat treatment applied to the present invention. - Referring to
FIG. 2 , laser irradiation for laser heat treatment is performed by irradiating alaser beam 210 to a high strength part of a formedbody 201 fastened to a fixedjig 220. Heat is conducted from a part where a laser beam directly irradiates to an adjacent part and a certain part is heated to a high temperature. - Hereinafter, the composition and effects of the invention will be explained in more detail by means of a description of a possible embodiment according to the invention. It should be understood that the embodiments are presented as a preferred example and the present invention is not limited to the following embodiments.
- Descriptions of details apparent to those skilled in the art will be omitted for clarity.
- Cold rolled specimens, which have compositions shown in Table 1 and was annealing treated in a temperature shown in Table2, are prepared. Then, laser heat treatment is performed for specimens 1 ∼ 10. For laser heat treatment, diode laser device (Produced by Eurovision) is used so that the temperature of the center of each specimen becomes 950°C, and then is cooled to 100°C at a cooling rate of 50°C/sec.
[Table 1] (Unit : wt %) No. C Si Mn P S Cr Al Ti B 1 0.22 0.23 1.23 0.0015 0.0001 0.17 0.04 0.018 0.003 2 0.21 0.26 1.33 0.0020 0.0008 0.20 0.05 0.022 0.003 3 0.20 0.19 1.13 0.0115 0.0021 0.22 0.07 0.024 0.003 4 0.23 0.26 1.51 0.0098 0.0001 0.09 0.04 0.011 0.003 5 0.19 0.22 1.61 0.0110 0.0021 0.03 0.08 0.084 0.003 6 0.23 0.26 1.51 0.0098 0.0001 0.09 0.04 0.011 0.003 7 0.17 0.13 1.12 0.0021 0.0001 0.32 0.08 0.008 0.021 8 0.35 0.11 1.81 0.0032 0.003 0.18 0.003 0.121 0.007 9 0.38 0.41 2.21 0.08 0.020 0.82 0.012 0.17 0.062 10 0.43 0.44 0.71 0.001 0.0002 0.92 0.09 0.18 0.001 - For specimens 1 ∼ 10, mechanical properties (A) of the center of specimens after laser heat treatment, mechanical properties (B) of the center of specimens before laser heat treatment, and mechanical properties (C) of the edge of specimens where laser heat treatment is not performed are measured.
- A Tensile strength (TS) and an elongation (El) are measured, and the results are shown in Table 2.
[Table 2] No. ANNEALING TEMPERATURE (°C) A B C TS(MPa) El(%) TS(MPa) El(%) TS(MPa) El(%) 1 730 559 29 1600 7 559 29 2 820 782 19 1532 7 782 19 3 860 830 12 1512 7 831 12 4 710 519 30 1612 8 519 30 5 710 519 30 1612 8 520 30 6 820 778 22 1482 9 778 22 7 640 452 35 1289 11 453 35 8 710 855 13 1816 4 856 13 9 800 982 11 1805 2 982 11 10 710 820 12 1724 4 822 12 - Referring to Table2, for specimens 1 ∼ 10 after laser heat treatment, tensile strength became super high strength at 1200 - 1900MPa for parts laser heat treatment is performed, and tensile strength was 400 - 990MPa and elongation was 10 - 40%, same properties as before heat treatment, for parts where laser heat treatment was not performed.
- Therefore, production method for steel components according to the present invention may be applied to steel components requiring different strengths such as bumper back beams for automobiles. Accordingly, using a separate reinforcement may be omitted, and may contribute to weight reduction. Also, since partial strengthening is possible by using only laser heat treatment, a separate pre-process for providing different strengths to a single material is not required.
- Although some exemplary embodiments have been described herein, it should be understood by those skilled in the art that these embodiments are given by way of illustration only, and that various modifications, variations and alterations can be made without departing from the spirit and scope of the invention. The scope of the present invention should be defined by the appended claims.
Claims (7)
- A method for manufacturing a steel product, comprising:(a) preparing a material comprising: by weight %, 0.1 ∼ 0.5% of carbon (C) ; 0.1 ∼ 0.5% of silicon (Si); 0.5 ∼ 3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01 ∼ 1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005 ∼ 0.08% of boron (B); and the balance of Fe and unavoidable impurities;(b) producing a formed body by forming the material into a predetermined shape; and(c) performing laser heat treatment to a part requiring high strength (high strength part) in the formed body, and locally strengthening the high strength part.
- The method according to claim 1, wherein, in step (a), a layer selected from Al plating layer, Al-Si plating layer, Zn-Ni plating layer, Zn plating layer, Zn-Al plating layer and high-temperature oxidation-resistant resin coating layer is formed on the surface of the material.
- The method according to claim 1, wherein, in step (c), the laser heat treatment irradiating a laser on the high strength part and heating the high strength part to a temperature higher than Ac3, and then cooling to a temperature lower than Ms at a cooling rate of 5 ~ 300°C/sec.
- The method according to claim 1, wherein, in step (a), the material has a tensile strength of 400 ~ 990MPa and an elongation of 10 ~ 40%.
- The method according to claim 4, wherein, in step (c), laser irradiating time and laser strength is adjusted for the tensile strength of the high strength portion is 1200 ~ 1900MPa in the laser heat treatment.
- A heat treated hardened steel comprising:by weight %, 0.1 ∼ 0.5% of carbon (C) ; 0.1 ∼ 0.5% of silicon (Si); 0.5 ∼ 3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01 ∼ 1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005 ∼ 0.08% of boron (B); and the balance of Fe and unavoidable impurities;having a tensile strength of 400 ∼ 990MPa and an elongation of 10 ∼ 40% before heat treatment, andhaving a tensile strength of 1200 ∼ 1900MPa and an elongation of 1 ∼ 13% after heat treatment.
- The heat treated hardened steel according to claim 6, wherein the steel has a layer selected from Al plating layer, Al-Si plating layer, Zn-Ni plating layer, Zn plating layer, Zn-Al plating layer and high-temperature oxidation-resistant resin coating layer is formed on the surface of the steel.
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KR1020110100174A KR101119173B1 (en) | 2011-09-30 | 2011-09-30 | Method for manufacturing steel product with different strength using laser quenching and quenched steel used the method |
PCT/KR2011/007703 WO2013047939A1 (en) | 2011-09-30 | 2011-10-17 | Preparation method of steel product having different strengths using laser heat treatment, and heat hardened steel used therein |
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WO2018065230A1 (en) * | 2016-10-05 | 2018-04-12 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a high strength tube part |
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TWI488925B (en) * | 2014-09-16 | 2015-06-21 | China Steel Corp | Anti - high temperature oxidation coating steel plate and its hot stamping method |
CN104946987A (en) * | 2015-05-28 | 2015-09-30 | 武汉钢铁(集团)公司 | High-strength finish rolled steel bar and production method thereof |
WO2017021440A1 (en) * | 2015-08-04 | 2017-02-09 | Autotech Engineering A.I.E. | Reinforced structural components |
KR101758517B1 (en) * | 2015-12-23 | 2017-07-14 | 주식회사 포스코 | Heat treatment apparatus and method for steel strip |
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US10260131B2 (en) | 2016-08-09 | 2019-04-16 | GM Global Technology Operations LLC | Forming high-strength, lightweight alloys |
KR20190078233A (en) * | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | Laser hardening low carbon steel sheet and manufacturing the same |
CN111733314A (en) * | 2019-03-25 | 2020-10-02 | 长城汽车股份有限公司 | Reinforcing method for outer panel of vehicle door |
KR20230074980A (en) | 2021-11-22 | 2023-05-31 | 주식회사 포스코 | Steel sheet having multi-strength and manufacturing method the same |
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US20150211086A1 (en) | 2015-07-30 |
WO2013047939A1 (en) | 2013-04-04 |
EP2762577A4 (en) | 2014-09-24 |
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US20140227553A1 (en) | 2014-08-14 |
CN103842527A (en) | 2014-06-04 |
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