HIGH STRENGTH BAKE HARDENING COLD ROLLED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND MANUFACTURING METHOD THEREOF

A high strength bake hardening cold rolled steel sheet having excellent surface quality and a manufacturing method thereof are provided to prevent surface defect from being generated by controlling dissolved organic carbon within grain with the distribution of the minute precipitate with properly co...

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Bibliographische Detailangaben
Hauptverfasser:	KANG, DEOK GU, YOON, JEONG BONG
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A high strength bake hardening cold rolled steel sheet having excellent surface quality and a manufacturing method thereof are provided to prevent surface defect from being generated by controlling dissolved organic carbon within grain with the distribution of the minute precipitate with properly controlling the carbon content. A high strength bake hardening cold rolled steel sheet having excellent surface quality includes C: 0.0005-0.004 weight%, Si: 0.02-0.6 weight%, Mn: 0.2-0.8 weight%, P: 0.005-0.2 weight%, S: 0.003-0.02 weight%, Al: 0.01-0.08 weight%, N: 0.004 weight% or less, Cu: 0.005-0.2 weight%, and rest Fe and other impurity. The content of Mn, Cu, and S satisfies 5