High-strength cold rolled steel sheet with excellent yield strength and ductility, coated steel plate, and method for manufacturing same

• Main Authors: LEE SEA-WOONG, LEE WON-HWI, LEE KYOO-YOUNG, RYU JOO-HYUN
• Format: Patent
• Language: Chinese; English
• Published: 23.11.2018
• Subjects: ALLOYS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to a high-strength steel sheet for use in lightening materials for electronic products and materials for vehicles including automobiles, trains and ships and, more particularly, to a high strength cold rolled steel sheet, a coated steel plate, and a method for manufacturing the same. Yield strength and ductility are improved by controlling the internal oxidation depthand the amount of residual austenite after first annealing, and the high strength cold rolled steel sheet and the coated steel plate can be stably manufactured and provided without any dent defects during the manufacturing thereof. 本发明涉及高强度钢板，其用于电子产品用材料和包括汽车、火车及船等的运输工具用材料等的轻量化，更详细地，涉及高强度冷轧钢板、镀覆钢板及它们的制造方法，其中通过控制内部氧化深度及次退火后的残余奥氏体的量，从而提高屈服强度及延展性，并且在生产时不会产生凹坑缺陷的情况下能够稳定地生产并提供。