ELECTROMAGNETIC BAR STEEL AND ITS PRODUCTION METHOD

• Main Authors: SHIRAGAMI TETSUO, TOMITA KUNIKAZU, TOYOOKA TAKAAKI, FUKUOKA KAZUAKI, KASAI MASAYUKI
• Format: Patent
• Language: English
• Published: 08.11.2007
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an electromagnetic bar steel having sufficient magnetic properties and high yield strength as a rotor core material, and to provide its production method. SOLUTION: The electromagnetic bar steel has a componential composition comprising, by mass, 0.04 to 0.12% C, ≤0.5% Si, 0.5 to 3.0% Mn, ≤0.1% Al, 0.03 to 0.35% Ti and 0.05 to 0.8% Mo, and the balance Fe with inevitable impurities, and has a structure of a ferrite single phase with the average crystal grain size of ≥60 μm; wherein fine precipitates with a grain size of <10 nm are dispersed into the ferrite, and the area ratio of the ferrite with a grain size of ≤10 μm is controlled to ≤10%. COPYRIGHT: (C)2008,JPO&INPIT