FE-NI ALLOY COLD ROLLED SHEET EXCELLENT IN CLEANLINESS AND ETCHING PIERCEABILITY AND ITS MANUFACTURE

• Main Authors: WATANABE ATSUSHI, INOUE TADASHI, KIKUCHI YOSHITERU, MATSUNO EIJU, HASEGAWA TERUYUKI, OKITA TOMOYOSHI
• Format: Patent
• Language: English
• Published: 10.08.1992
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To manufacture an Fe-Ni alloy cold rolled sheet excellent in cleanliness and etching pierceability by adding Al to an Fe-Ni alloy having a specified compsn. and bringing the above into reaction with slag having a specified compsn. in a ladle made of a specified refractory. CONSTITUTION:A prescribed amt. of Al is added to a desulfurized and decarburized Fe-Ni molten alloy contg. 30 to 45wt.% Ni. This addition is executed in a ladle made of an MgO-CaO series refractory contg. 20 to 40% CaO, and this alloy is successively brought into reaction with CaO-Al2O3-MgO series slag constituted of >=57% CaO+AlO3, >=0.45% CaO/(CaO+Al2O3), <=25% MgO, <=15% SiO2 and <=3% oxide of metal having oxygen affinity weaker than that of Si and is deoxidized. This alloy is subjected to casting, blooming, hot rolling and cold rolling into a cold rolled sheet with <=6mum grain size contg. <=0.002% non-metallic inclusions expressed in terms of oxygen. In this way, an Fe-Ni series cold rolled sheet suitable as a high brightness TV shadow mask material can be obtd.