JP6159802B2 - 優れた剛性及び延性を有するフェライト系軽量高強度鋼板及びその製造方法 - Google Patents
優れた剛性及び延性を有するフェライト系軽量高強度鋼板及びその製造方法 Download PDFInfo
- Publication number
- JP6159802B2 JP6159802B2 JP2015529648A JP2015529648A JP6159802B2 JP 6159802 B2 JP6159802 B2 JP 6159802B2 JP 2015529648 A JP2015529648 A JP 2015529648A JP 2015529648 A JP2015529648 A JP 2015529648A JP 6159802 B2 JP6159802 B2 JP 6159802B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- strength
- cold
- lightweight high
- strength steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- 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
- 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
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
-
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D2211/005—Ferrite
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- 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
- Y10T428/12778—Alternative base metals from diverse categories
-
- 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
- Y10T428/12951—Fe-base component
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
鋼中のCはセメンタイト[(Fe,Mn)3C]、カッパ(κ)炭化物[(Fe,Al)3C]、及び微細なTiCを製造し、分散強化の作用を通じて結晶粒を微細化する。また、焼鈍中の再結晶過程において、析出物の周辺に無作為な核生成をもたらして集合組織の優先培養を抑制する。適正水準のTiC及び(Fe,Mn)3AlCまたはκ炭化物を形成することができるように上記Cの含量は0.02%以上であることが好ましい。Cの含量が増加するほどセメンタイト及びκ炭化物が増加して、強度の上昇に有利に働くが、鋼の延性は逆に低下する。特に、Alが添加された鋼ではFeAlの規則相及びκ炭化物がフェライト結晶粒界に析出して脆性を起こしかねないため、上記Cの含量は0.1%以下であることが好ましい。
MnはCとともに本発明において炭化物の特性を制御し、固溶強化によって強度を上昇させる元素である。MnはCと共存することで炭化物の高温析出を助長し、これにより、粒界の炭化物を抑制することにより熱間脆性を抑え、最終的に鋼板の強度向上に寄与する。また、Mnは鋼の格子定数を増加させて密度を低下させるため鋼材の比重を減らす役割をする。なお、Mnの含量が高いと、高温においてオーステナイトの出現で炭素の濃化が行われ、冷却中に共析変態をしたり、残留オーステナイトを形成させて延性を向上させる。しかし、比重低減の立場からみると、充填率が高いオーステナイト組織は比重の低減効果を低下させるという問題がある。従って、高温において適切なオーステナイトを形成するほどのC及びMnの含量が必要であるため、これを勘案してMnの含量は4%以上であることが好ましい。但し、上記Mnが過剰に添加されると、延性は著しく増加するが、比重低減のためのAlの含量がさらに高ければならないため脆性などの問題があり、オーステナイトが出現してフェライト組織内にバンド状のオーステナイト群集体が形成される。オーステナイト組織は、変形中に焼成有機変態によって特定方向の変形が大幅に増加するため、面内異方性が著しく増加する。従って、本発明では上記Mnの含量が15%以下であることが好ましい。
Alは本発明においてC、Mn、Tiとともに最も重要な元素で、鋼材の比重を低減させる役割をする。上記効果を得るために、上記Alは4%以上添加されることが好ましい。フェライト組織の安定性及び比重低減のためには多量に添加することが好ましいが、多量に添加すると、κ炭化物、FeAl及びFe3Alのような金属間の化合物が多量に生成されて鋼の延性を著しく低下させる可能性があるため、10%以下の含量を有することが好ましい。
SiはAlと同様に鋼の比重低減に効果的であり、フェライト中のセメンタイト析出を抑制して微細なTiCまたはκ炭化物が増加する効果があるため強度の上昇にも有利である。しかし、2%を超えると、C及びAlの含量がともに高い場合、規則相であるFeAlまたはFe3Alが急激に増加して脆性の破壊を起こしかねないため、上記Siの含量は2.0%以下の範囲を有することが好ましい。
Tiは本発明において非常に重要な元素のうちの一つである。Alが多量に添加された鋼はAlがフェライト領域を拡張して高温でもフェライトを安定させるが、フェライトは高温において非常に速い速度で回復し、再結晶が行われる。その結果、熱延温度が少し低くなるだけでも、粗大な結晶粒が形成されて強度が低下するという問題がある。これを抑制するために、Tiを0.01%以上添加して微細な高温のTiC析出物を形成させることで結晶粒を微細化する。スラブの再加熱のような高温においてTiNが結晶粒の成長を抑制するのは周知の事実である。しかし、Alの含量が本発明のように高くなると、窒素がAlNを優先的に形成して溶鋼中に晶出して浮上するため、Alが4%を超えるだけで鋼中の窒素はほぼ消滅する。これにより、TiはTiNを形成せずに殆どTiCを形成するようになる。熱間仕上げ圧延中に形成される微細なTiCは、結晶粒をさらに微細化させるため強度を確保するのに必ず必要となる。オーステナイトからフェライトに変態する際にκ炭化物の群集化を抑制してκ炭化物を分散させ、その結果、κ炭化物が微細化する効果が行われる。また、冷間圧延過程においてTiCのような析出物は周囲に無作為な核生成場所を提供するため、集合組織の優先方位の形成を抑制して面内異方性を低減させる。これにより、上記Tiを多量に添加することが好ましいが、過剰に添加すると、原価が上昇するという問題があることに加え、析出温度がさらに高温になって次第に析出物が粗大化し、微細析出の作用が行われずに引張強度及び降伏比が減少するため、上記Tiの含量は0.3%以下の範囲を有することが好ましい。
Sbは本発明による鋼のめっき性を確保し、高温において粒界に形成されるAlN及びAl2O3の形成を抑制する役割をする。高温において固溶限度を超えて粒界に偏析するSbは、粒界を通じて拡散される酸素または窒素を防ぐため高温で形成されるAlN及びAl2O3を抑制するだけでなく、Al、Si、Mnなどの高温酸化の傾向が強い元素の粒界偏析及び拡散経路を遮断することから、表面濃化酸化物が抑制されて溶融亜鉛及び鉄素地層の濡れ性をよくするため、めっき密着性のために重要である。このためには、上記Sbが0.005%以上添加されることが好ましいが、添加量が多すぎると、粒界に溶融状態で存在するSbが多くなって高温延性を低下させるため、上記Sbの含量は0.2%以下であることが好ましい。
0.25×Ti/C:0.17〜1.0
Mn/Al×Log(C×Ti×10000):1.0〜10
下記表1に示す合金組成を有する鋼スラブを真空誘導溶解を用いて製造した後、1200℃の温度で加熱して抽出し、下記表2に示すように、860〜930℃において熱間圧延を仕上げ、3.0〜3.5mmの厚さの熱延鋼板を得た。製造された熱延鋼板を350〜720℃の温度において巻取した後、1時間維持してから炉冷して常温で冷却し、酸洗を通じてスケールを除去し、冷間圧延して0.7〜1.0mmの厚さの冷延鋼板を得た。次に、上記冷延鋼板を5℃/sの速度で加熱して、下記表2に示す焼鈍条件で焼鈍を行った後、20℃/sの冷却速度で400℃まで急冷し、100秒間恒温熱処理してから常温まで空冷して冷延鋼板を製造した。このように製造された冷延鋼板に対して機械的物性を測定した。結果を下記表3に示す。このとき、比重は、鋼板を100×100mmのサイズに製作した後、常温において重さを測定してから0.05mmの針金に吊るして常温の水が収容されたビーカーに入れて重さを測定する方式で測定した。このとき、水の比重は1g/ccとし、比重低減率の基準になる鋼の比重は7.84g/ccとした。耳発生率は、鋼板の直径が95mmになるように円形に製作した後、直径50mmのパンチを用いて絞り比が1.9になるように絞り加工を行い、これによって製作されたカップの最大高さ(カップの山高さ)及び最小高さ(カップの溝高さ)を測定した後、(最大高さ−最小高さ)/最大高さで求めた。面内異方性は、鋼板を15%延伸した後、上記延伸前と後の幅変化を測定した結果を通じて測定した。但し、比較例5の場合は10%延伸後の結果値を示す。
Claims (10)
- 重量%で、C:0.02〜0.1%、Mn:4〜15%、Al:4〜10%、Si:2.0%以下(0は除く)、Ti:0.01〜0.3%、Sb:0.005〜0.2%、Ca:0.001〜0.02%、B:0.001〜0.003%、残部Fe及びその他の不可避な不純物からなり、
0.25×Ti/Cの値が0.17〜1.0を満たし、
Mn/Al×Log(C×Ti×10000)が1.0〜10を満たし、
比重が7.2g/cc以下、引張強度が540MPa以上、降伏比が0.8以上、TS×Elが17,000MPa%以上、面内異方性が0.3以下である、フェライト系軽量高強度鋼板。 - 前記鋼板は、TiC、(Fe,Mn)3AlC、(Fe,Al)3C及び(Fe,Mn)3Cからなる群より選択された1種以上の析出物を含む、請求項1に記載のフェライト系軽量高強度鋼板。
- 前記鋼板は、結晶粒の平均サイズが10μm以下である、請求項1に記載のフェライト系軽量高強度鋼板。
- 前記鋼板は、冷延鋼板及びめっき鋼板のうちいずれか一つである、請求項1に記載のフェライト系軽量高強度鋼板。
- 前記めっき鋼板は、Zn系、Zn−Fe系、Zn−Al系、Zn−Mg系、Zn−Al−Mg系、Al−Si系及びAl−Mg−Si系からなる群より選択された1種のめっき層を有する、請求項4に記載のフェライト系軽量高強度鋼板。
- 前記めっき鋼板は、10〜200μmの平均厚さを有するめっき層を含む、請求項4に記載のフェライト系軽量高強度鋼板。
- 重量%で、C:0.02〜0.1%、Mn:4〜15%、Al:4〜10%、Si:2.0%以下(0は除く)、Ti:0.01〜0.3%、Sb:0.005〜0.2%、Ca:0.001〜0.02%、B:0.001〜0.003%、残部Fe及びその他の不可避な不純物からなり、0.25×Ti/Cの値が0.17〜1.0を満たし、Mn/Al×Log(C×Ti×10000)が1.0〜10を満たすスラブを再加熱した後、850℃以上において熱間圧延して熱延鋼板を得る段階と、
前記熱延鋼板を500〜700℃において巻取する段階と、
前記熱延鋼板を巻取した後、冷間圧延して冷延鋼板を得る段階と、
前記冷延鋼板を1〜20℃/sの速度で再結晶温度(Tnr)〜900℃まで加熱する段階と、
加熱された前記冷延鋼板を10〜180秒間焼鈍する段階と、を含む、フェライト系軽量高強度鋼板の製造方法。 - 前記冷間圧延は、40〜90%の圧下率で行われる、請求項7に記載のフェライト系軽量高強度鋼板の製造方法。
- 前記焼鈍後に、前記冷延鋼板を1〜100℃/sの速度で200〜500℃まで冷却した後、恒温熱処理する段階をさらに含む、請求項7に記載のフェライト系軽量高強度鋼板の製造方法。
- 前記焼鈍後に、前記冷延鋼板をめっきする段階をさらに含む、請求項7に記載のフェライト系軽量高強度鋼板の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20120097807A KR101449119B1 (ko) | 2012-09-04 | 2012-09-04 | 우수한 강성 및 연성을 갖는 페라이트계 경량 고강도 강판 및 그 제조방법 |
KR10-2012-0097807 | 2012-09-04 | ||
PCT/KR2012/011473 WO2014038759A1 (en) | 2012-09-04 | 2012-12-26 | Ferritic lightweight high-strength steel sheet having excelent stiffness and ductility, and method of manufacturing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2015532682A JP2015532682A (ja) | 2015-11-12 |
JP6159802B2 true JP6159802B2 (ja) | 2017-07-05 |
Family
ID=50237348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2015529648A Active JP6159802B2 (ja) | 2012-09-04 | 2012-12-26 | 優れた剛性及び延性を有するフェライト系軽量高強度鋼板及びその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9856542B2 (ja) |
EP (1) | EP2893050B1 (ja) |
JP (1) | JP6159802B2 (ja) |
KR (1) | KR101449119B1 (ja) |
CN (1) | CN104603308B (ja) |
WO (1) | WO2014038759A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2982453A1 (de) * | 2014-08-06 | 2016-02-10 | Primetals Technologies Austria GmbH | Einstellen eines gezielten Temperaturprofiles an Bandkopf und Bandfuß vor dem Querteilen eines Metallbands |
EP3378965B1 (en) * | 2016-02-25 | 2020-08-12 | Nippon Steel Corporation | High-strength hot-dip galvanized steel sheet excellent in impact peeling resistance and worked portion corrosion resistance |
KR20240050440A (ko) * | 2016-12-22 | 2024-04-18 | 아르셀러미탈 | 냉간 압연 및 열처리된 강 시트, 그의 제조 방법 및 차량 부품들을 제조하기 위한 이런 강의 사용 |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5278881A (en) * | 1989-07-20 | 1994-01-11 | Hitachi, Ltd. | Fe-Cr-Mn Alloy |
DE19727759C2 (de) | 1997-07-01 | 2000-05-18 | Max Planck Inst Eisenforschung | Verwendung eines Leichtbaustahls |
DE10128544C2 (de) * | 2001-06-13 | 2003-06-05 | Thyssenkrupp Stahl Ag | Höherfestes, kaltumformbares Stahlblech, Verfahren zu seiner Herstellung und Verwendung eines solchen Blechs |
DE10259230B4 (de) | 2002-12-17 | 2005-04-14 | Thyssenkrupp Stahl Ag | Verfahren zum Herstellen eines Stahlprodukts |
JP4235077B2 (ja) | 2003-06-05 | 2009-03-04 | 新日本製鐵株式会社 | 自動車用高強度低比重鋼板とその製造方法 |
JP4430502B2 (ja) | 2004-02-24 | 2010-03-10 | 新日本製鐵株式会社 | 延性に優れた低比重鋼板の製造方法 |
JP2005325388A (ja) | 2004-05-13 | 2005-11-24 | Kiyohito Ishida | 低比重鉄合金 |
JP4324072B2 (ja) | 2004-10-21 | 2009-09-02 | 新日本製鐵株式会社 | 延性に優れた軽量高強度鋼とその製造方法 |
JP2006149204A (ja) | 2004-10-27 | 2006-06-15 | Yodogawa Engineering Kk | コーヒー豆の焙煎装置 |
JP4464811B2 (ja) | 2004-12-22 | 2010-05-19 | 新日本製鐵株式会社 | 延性に優れた高強度低比重鋼板の製造方法 |
JP4299774B2 (ja) | 2004-12-22 | 2009-07-22 | 新日本製鐵株式会社 | 延性および疲労特性に優れた高強度低比重鋼板とその製造方法 |
JP4819489B2 (ja) | 2005-11-25 | 2011-11-24 | Jfeスチール株式会社 | 一様伸び特性に優れた高強度鋼板およびその製造方法 |
JP4797807B2 (ja) | 2006-05-30 | 2011-10-19 | Jfeスチール株式会社 | 高剛性低密度鋼板およびその製造方法 |
KR100928788B1 (ko) * | 2007-12-28 | 2009-11-25 | 주식회사 포스코 | 용접성이 우수한 고강도 박강판과 그 제조방법 |
KR101027250B1 (ko) * | 2008-05-20 | 2011-04-06 | 주식회사 포스코 | 고연성 및 내지연파괴 특성이 우수한 고강도 냉연강판,용융아연 도금강판 및 그 제조방법 |
KR100985298B1 (ko) * | 2008-05-27 | 2010-10-04 | 주식회사 포스코 | 리징 저항성이 우수한 저비중 고강도 열연 강판, 냉연강판, 아연도금 강판 및 이들의 제조방법 |
JP4623233B2 (ja) | 2009-02-02 | 2011-02-02 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板およびその製造方法 |
CN105908069B (zh) * | 2009-04-14 | 2018-03-06 | 新日铁住金株式会社 | 切削性优异的低比重热锻造用棒钢 |
JP4811528B2 (ja) | 2009-07-28 | 2011-11-09 | Jfeスチール株式会社 | 高強度冷延鋼板およびその製造方法 |
CN102031027B (zh) | 2010-11-19 | 2013-11-27 | 昆明理工大学 | 氧化硅系高温红外辐射涂料及其制备方法 |
-
2012
- 2012-09-04 KR KR20120097807A patent/KR101449119B1/ko active IP Right Grant
- 2012-12-26 EP EP12884014.7A patent/EP2893050B1/en active Active
- 2012-12-26 US US14/421,024 patent/US9856542B2/en active Active
- 2012-12-26 WO PCT/KR2012/011473 patent/WO2014038759A1/en active Application Filing
- 2012-12-26 CN CN201280075611.1A patent/CN104603308B/zh active Active
- 2012-12-26 JP JP2015529648A patent/JP6159802B2/ja active Active
Also Published As
Publication number | Publication date |
---|---|
CN104603308B (zh) | 2017-07-28 |
KR20140030969A (ko) | 2014-03-12 |
WO2014038759A1 (en) | 2014-03-13 |
EP2893050B1 (en) | 2019-03-13 |
US9856542B2 (en) | 2018-01-02 |
EP2893050A4 (en) | 2016-06-01 |
CN104603308A (zh) | 2015-05-06 |
EP2893050A1 (en) | 2015-07-15 |
JP2015532682A (ja) | 2015-11-12 |
KR101449119B1 (ko) | 2014-10-08 |
US20150218668A1 (en) | 2015-08-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5699226B2 (ja) | 降伏比及び延性に優れたオーステナイト系軽量高強度鋼板及びその製造方法 | |
JP5255398B2 (ja) | 比重高強度冷延鋼板および低比重高強度メッキ鋼板の製造方法 | |
JP5393459B2 (ja) | 衝突特性に優れた高マンガン型高強度鋼板 | |
TWI463019B (zh) | 延伸凸緣成形性優異之高強度熱軋鋼板及其製造方法 | |
JP5470375B2 (ja) | 高延性及び耐遅れ破壊特性に優れた高強度冷延鋼板、溶融亜鉛メッキ鋼板及びその製造方法 | |
JP5487203B2 (ja) | 表面特性に優れた高加工用高強度薄鋼板及び亜鉛メッキ鋼板とその製造方法 | |
JP6074031B2 (ja) | 熱間または冷間低密度圧延鋼、この実施方法および使用 | |
JP5884472B2 (ja) | 伸びフランジ性に優れた高強度熱延鋼板およびその製造方法 | |
JP2008540826A (ja) | 面内異方性が低い高降伏比冷延鋼板及びその製造方法 | |
JP2011153336A (ja) | 成形性に優れた高強度冷延鋼板及びその製造方法 | |
TWI518187B (zh) | 高強度熱軋鋼板及其製造方法 | |
JP5042694B2 (ja) | 延性及び加工性に優れた高強度低比重鋼板及びその製造方法 | |
KR101560940B1 (ko) | 강도와 연성이 우수한 경량강판 및 그 제조방법 | |
TWI515309B (zh) | 高強度熱軋鋼板及其製造方法 | |
JP5257239B2 (ja) | 延性、加工性及び靭性に優れた高強度低比重鋼板及びその製造方法 | |
JP6159802B2 (ja) | 優れた剛性及び延性を有するフェライト系軽量高強度鋼板及びその製造方法 | |
JP5483562B2 (ja) | 伸びと伸びフランジ性のバランスに優れた高強度冷延鋼板 | |
WO2015118864A1 (ja) | 高強度熱延鋼板およびその製造方法 | |
JP6205911B2 (ja) | 鋼板ブランクならびにレーザ切断加工用鋼板およびレーザ切断加工用鋼板の製造方法 | |
KR101403215B1 (ko) | 연성이 우수한 초고강도 고망간 강판 및 그 제조방법 | |
JP2016028174A (ja) | 伸びフランジ性と打ち抜き性に優れた高強度熱延鋼板及び溶融亜鉛めっき高強度熱延鋼板とそれらの製造方法 | |
KR101657801B1 (ko) | 강도와 연성이 우수한 강판 및 그 제조방법 | |
JP5450618B2 (ja) | 表面特性及び耐2次加工脆性に優れた焼付硬化鋼及びその製造方法 | |
KR20140041290A (ko) | 냉연강판 및 그 제조 방법 | |
KR20150047043A (ko) | 고강도 저비중 냉연강판 및 이의 제조방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20151201 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20160224 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20160802 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20161026 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20170207 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20170413 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20170516 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20170612 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 6159802 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |