EP2762577A1 - Herstellungsverfahren für ein stahlprodukt mi5 unterschiedlichen stärken mittels laserwärmebehandlung und wärmegehärteter stahl dafür - Google Patents

Herstellungsverfahren für ein stahlprodukt mi5 unterschiedlichen stärken mittels laserwärmebehandlung und wärmegehärteter stahl dafür Download PDF

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Publication number
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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EP
European Patent Office
Prior art keywords
heat treatment
less
laser
plating layer
steel
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EP11873399.7A
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English (en)
French (fr)
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EP2762577B1 (de
EP2762577A4 (de
Inventor
Hee-Joong Im
Seung-Man Nam
Bo-Ryong Lee
Kyung-Bo Kim
Youn-Il JUNG
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Hyundai Steel Co
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Hyundai Hysco Co Ltd
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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
    • 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
    • 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]
    • 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
    • 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

Definitions

  • 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.
  • lighter and stronger components are realized through process such as alloying constituent of materials, heat treatment, etc.
  • 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 )
  • Korean Patent No. 10-0765723 (published on October 11, 2007 ) applies the hot stamping technology.
  • hot stamping technology is used only for strengthening an entire material, and is difficult to apply to partial strengthening.
  • Korean Patent Laid-open Publication No. 10-2011-0062428 (published on June 10, 2011 ) mentions partial strengthening hot stamping. But, to partial strengthen using hot stamping method, issues such as going through a pre process such as applying insulation to parts where partial strengthening is not performed, etc. before hot stamping exist.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the material may be in a blank shape, and hot rolled steel or cold rolled steel may be used.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • amount of manganes is less than 0.5 wt%, the effect of addition is insufficient.
  • 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.
  • 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.
  • amount of chromium is less than 0.01 wt%, the effect of addition is insufficient.
  • 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.
  • 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.
  • 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.
  • amount of boron is less than 0.0005 wt%, the effect of addition is insufficient.
  • amount of boron is greater than 0.08 wt%, problem of toughness being greatly hindered due to excessive increase in hardening property occur.
  • 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.
  • 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.
  • 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.
  • a laser such as a diode laser
  • 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.
  • laser irradiating time and laser strength is adjusted for tensile strength of a high strength part is 1200 - 1900MPa.
  • 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.
  • 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.
  • 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.
  • laser irradiation for laser heat treatment is performed by irradiating a laser beam 210 to a high strength part of a formed body 201 fastened to a fixed jig 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.
  • 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.

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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)
EP11873399.7A 2011-09-30 2011-10-17 Herstellungsverfahren für ein stahlprodukt mit unterschiedlichen festigkeiten mittels laserwärmebehandlung Active EP2762577B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110100174A KR101119173B1 (ko) 2011-09-30 2011-09-30 레이저 열처리를 이용한 이종강도를 갖는 강 제품 제조 방법 및 이에 이용되는 열처리 경화강
PCT/KR2011/007703 WO2013047939A1 (ko) 2011-09-30 2011-10-17 레이저 열처리를 이용한 이종강도를 갖는 강 제품 제조 방법 및 이에 이용되는 열처리 경화강

Publications (3)

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EP2762577A1 true EP2762577A1 (de) 2014-08-06
EP2762577A4 EP2762577A4 (de) 2014-09-24
EP2762577B1 EP2762577B1 (de) 2016-04-27

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US (2) US20140227553A1 (de)
EP (1) EP2762577B1 (de)
JP (1) JP5898772B2 (de)
KR (1) KR101119173B1 (de)
CN (1) CN103842527A (de)
WO (1) WO2013047939A1 (de)

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WO2018065230A1 (de) * 2016-10-05 2018-04-12 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur herstellung eines hochfesten tubenteils

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KR101505244B1 (ko) 2012-07-30 2015-03-23 현대제철 주식회사 강 부품의 열처리 방법 및 이를 이용한 트랙링크 제조 방법
US9708685B2 (en) 2013-11-25 2017-07-18 Magna International Inc. Structural component including a tempered transition zone
TWI488925B (zh) * 2014-09-16 2015-06-21 China Steel Corp Anti - high temperature oxidation coating steel plate and its hot stamping method
CN104946987A (zh) * 2015-05-28 2015-09-30 武汉钢铁(集团)公司 一种高强度精轧钢筋及其生产方法
JP2018526220A (ja) * 2015-08-04 2018-09-13 オートテック・エンジニアリング・アグルパシオン・デ・インテレス・エコノミコＡｕｔｏｔｅｃｈ Ｅｎｇｉｎｅｅｒｉｎｇ Ａ．Ｉ．Ｅ． 補強された構造部品
KR101758517B1 (ko) * 2015-12-23 2017-07-14 주식회사 포스코 강판 열처리 장치 및 방법
US10294552B2 (en) * 2016-01-27 2019-05-21 GM Global Technology Operations LLC Rapidly solidified high-temperature aluminum iron silicon alloys
US10260131B2 (en) 2016-08-09 2019-04-16 GM Global Technology Operations LLC Forming high-strength, lightweight alloys
KR20190078233A (ko) * 2017-12-26 2019-07-04 주식회사 포스코 레이저 경화형 저탄소 강판 및 그 제조방법
CN111733314A (zh) * 2019-03-25 2020-10-02 长城汽车股份有限公司 用于车门外板的加强方法
KR20230074980A (ko) 2021-11-22 2023-05-31 주식회사 포스코 복수의 강도를 가지는 강판 및 그 제조방법

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US20150211086A1 (en) 2015-07-30
KR101119173B1 (ko) 2012-02-22
WO2013047939A1 (ko) 2013-04-04
EP2762577B1 (de) 2016-04-27
US20140227553A1 (en) 2014-08-14
CN103842527A (zh) 2014-06-04
EP2762577A4 (de) 2014-09-24
JP2014534334A (ja) 2014-12-18
JP5898772B2 (ja) 2016-04-06

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