METHOD FOR PRODUCING FERRITIC STAINLESS COLD ROLLED STEEL SHEET AND STAINLESS HOT ROLLED STEEL SHEET USED FOR THE METHOD

PROBLEM TO BE SOLVED: To provide a method for producing a ferritic stainless cold rolled steel sheet capable of cold rolling at a draft of 95% or more without generating the ear cracking and fracture of a steel strip even without conducting process annealing. SOLUTION: A ferritic stainless steel sla...

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Bibliographische Detailangaben
Hauptverfasser:	ISHIZUKA HARUHIKO, KATO YASUSHI, MASUI SUSUMU
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To provide a method for producing a ferritic stainless cold rolled steel sheet capable of cold rolling at a draft of 95% or more without generating the ear cracking and fracture of a steel strip even without conducting process annealing. SOLUTION: A ferritic stainless steel slab is subjected to hot rolling in such a manner that the total draft of three passes in the poststage is controlled to the range of 35% or more, and also, hot rolling finishing temperature is controlled to the range of 970 deg.C or less to form a hot rolled steel sheet having the surface hardness (Hv) of >230, next, the hot rolled steel sheet is annealed in the temperature range of 800 to 880 deg.C to control the surface hardness (Hv) to 170 or less and also the average crystal grain size to 100 μm or less, and, after that, without conducting process annealing, cold rolling is conducted at a draft of 95% or more.