Stainless steel foil and method for manufacturing same

• Main Authors: UNNO, HIROTO, NOSE, KOICHI, INAGUMA, TORU, FUJIMOTO, NAOKI, SAWAKI, NAOYA, NAGASAKI, SHUJI, TERASHIMA, SHINICHI
• Format: Patent
• Language: Chinese; English
• Published: 01.10.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING

The present invention addresses the problem of securing high thickness accuracy even for ultra-thin stainless steel foil having a thickness of 60 [mu]m or less while also securing plastic deformability and breaking elongation, that is, securing excellent press workability (deep drawability). The present invention solves the above problem by providing an ultra-thin stainless steel foil, which has 3 or more crystal grains in the thickness direction, and in which the recrystallization rate is between 90% and 100% inclusive, and the nitrogen concentration at the surface is 1.0 mass% or less. Thus, with this method for manufacturing an ultra-thin stainless steel foil having a thickness of 5 to 60 [mu]m by rolling a stainless steel sheet and subsequently performing final annealing, it is possible to manufacture an ultra-thin stainless steel foil in which the rolling reduction from rolling immediately prior to the final annealing is 30% or more, the post-rolling final annealing temperature is 950 DEG C to 1050 DEG C