HIGH-STRENGTH COLD-ROLLED STEEL SHEET, HIGH-STRENGTH GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED GALVANIZED STEEL SHEET HAVING MAXIMUM TENSILE STRENGTH OF 780 MPa AND EXCELLENT COLLISION CHARACTERISTIC AND THEIR PRODUCTION METHOD

PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel sheet, a high-strength galvanized steel sheet and a high-strength alloyed galvanized steel sheet which have a maximum tensile strength(TS) of 780 MPa or higher and are applicable to impact absorption members on collision and their pr...

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Bibliographische Detailangaben
Hauptverfasser:	TODA YURI, AZUMA MASASHI, MARUYAMA NAOKI, ISHINO MAYUKO, UENISHI AKIHIRO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high-strength cold-rolled steel sheet, a high-strength galvanized steel sheet and a high-strength alloyed galvanized steel sheet which have a maximum tensile strength(TS) of 780 MPa or higher and are applicable to impact absorption members on collision and their production method.SOLUTION: A steel sheet has a micro-structure which contains, by volume fraction, 20% or more of ferrite as the main phase and a total of 5-80% of martensite and/or bentonite as the second phase and is restricted in volume fraction of retained austenite to smaller than 10%. The ratio of martensite and bentonite particles having one or more grains of penetrating ferrite is 20% or more of all the martensite and bentonite particles. 【課題】最大引張強度（ＴＳ）７８０ＭＰａ以上で衝突時の衝撃吸収部材に適用可能な高強度冷延鋼板、高強度溶融亜鉛めっき鋼板、及び、高強度合金化溶融亜鉛めっき鋼板とこれらの製造方法を提供する。【解決手段】ミクロ組織が、体積分率で主相としてフェライトを２０％以上含有し、第二相としてマルテンサイト及びベイナイトの１種又は２種以上を合計で５〜８０％以下含有し、残留オーステナイト体積率を１０％未満に制限する鋼板であって、一個以上の貫通フェライトを持つマルテンサイト粒、あるいは、ベイナイト粒の割合が、全マルテンサイト粒及びベイナイト粒の２０％以上となることを特徴とする。【選択図】なし