A ZINC OR ZINC-ALLOY COATED STRIP OR STEEL WITH IMPROVED ZINC ADHESION

A zinc or zinc-alloy coated rolled steel strip or sheet includes 0.08-0.28 C, 1.4-4.5 Mn, 0.01-0.5 Cr, 0.01-2.5 Si, 0.01-0.6 Al. The steel has a tensile strength of 950-1550 MPa, yield strength of 550-1400 MPa, yield ratio ≥0.50, and Ri/t≤4. The microstructure has ≥70 tempered martensite+bainite, ≤1...

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Bibliographische Detailangaben
Hauptverfasser:	MORTLBAUER, Thomas, STEINEDER, Katharina, SCHWARZENBRUNNER, Michael
Format:	Patent
Sprache:	eng
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:	A zinc or zinc-alloy coated rolled steel strip or sheet includes 0.08-0.28 C, 1.4-4.5 Mn, 0.01-0.5 Cr, 0.01-2.5 Si, 0.01-0.6 Al. The steel has a tensile strength of 950-1550 MPa, yield strength of 550-1400 MPa, yield ratio ≥0.50, and Ri/t≤4. The microstructure has ≥70 tempered martensite+bainite, ≤10 fresh martensite, 2-20 retained austenite, and ≤20 polygonal ferrite. The steel has a decarburized zone where the C content at a depth of 20 μm is not more than 75% of the carbon content in the middle of the steel strip and/or the microhardness at a depth of 20 μm is not higher than 75% of the microhardness in the middle of the steel strip. The adhesion of the zinc or zinc alloy coating is 1 or 2 according to SEP 1931.