HIGH MANGANESE STEEL SHEET WITH HIGH YIELD RATIO, EXCELLENT YIELD STRENGTH AND FORMABILITY AND MANUFACTURING METHOD THEREOF

• Main Authors: HWANG, HYUN GYU, KIM, SUNG KYU, KIM, GYO SUNG
• Format: Patent
• Language: English; Korean
• Published: 29.06.2010
• Subjects: 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE: A high yield ratio high manganese steel sheet and a manufacturing method thereof are provided to achieve high yield ratio by improving the collision characteristic and moldability and prevent the degradation of physical property. CONSTITUTION: A high yield ratio high manganese steel sheet comprises C 0.2~1.5 weight%, Mn 10~25 weight%, Al 0.01~3.0 weight%, Si 2.0 weight% or less, P 0.03 weight% or less, S 0.03 weight% or less, N 0.04 weight% or less, V 0.01~0.3 weight%, Nb 0.01~0.10 weight%, and the rest Fe and other inevitable impurities. The steel sheet has an austenite single phase organization, a yield strength of 500MPa or greater, an elongation ratio of 40% or greater, and a yield ratio of 0.7 or greater.