HIGH STRENGTH THIN STEEL SHEET AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a high strength thin steel sheet which has a high ductility and an excellent stretch-flange property in a range of about 700-1300 MPa in tensile strength and its manufacturing method. SOLUTION: The steel sheet (x), which is manufactured properly employing a rolling m...

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Main Authors TAKESHI ICHIRO, KANESHIGE HIROSHI, AKISUE OSAMU, SHINTOMI TATSUYA, WAKITANI SOICHIRO, MORIMOTO TAKAHARU
Format Patent
LanguageEnglish
Published 02.09.2005
Edition7
Subjects
ALLOYS
CHEMICAL SURFACE TREATMENT
CHEMISTRY
COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
COATING MATERIAL WITH METALLIC MATERIAL
COATING METALLIC MATERIAL
DIFFUSION TREATMENT OF METALLIC MATERIAL
FERROUS OR NON-FERROUS ALLOYS
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
PERFORMING OPERATIONS
PUNCHING METAL
ROLLING OF METAL
SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:PROBLEM TO BE SOLVED: To provide a high strength thin steel sheet which has a high ductility and an excellent stretch-flange property in a range of about 700-1300 MPa in tensile strength and its manufacturing method. SOLUTION: The steel sheet (x), which is manufactured properly employing a rolling mill 1 and a continuous annealing facility 2, contains 0.10-0.22% C, ≤0.30% Si, 1.0-2.2% Mn, 0.10-0.22% Ti by mass %, and has a composite structure including martensite with the average grain diameter of 5 μm or less dispersed in ferrite with the average grain diameter of 5 μm or less, in which a volume % of martensite is 5-30%. The steel sheet is not only excellent in tensile strength, ductility and stretch-flange property but also desirable in plating performance. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20040046019