DENT-RESISTANT COLD-ROLLED STEEL SHEET HAVING EXCELLENT DENT-RESISTANCE PROPERTIES, DENT-RESISTANT PLATED STEEL SHEET, AND METHOD FOR MANUFACTURING SAME

• Main Authors: PARK Young Ju, YU Ha Young, HUH Sung Yul, JANG Min Ho, HAN Seong Kyung, KIM Byoung Jin, KANG Chun Ku
• Format: Patent
• Language: English; Spanish
• Published: 30.11.2022
• 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; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention provides a dent-resistant cold-rolled steel sheet having excellent dent-resistance properties. According to one embodiment of the present invention, the dent-resistant cold-rolled steel sheet comprises, by weight, carbon (C): 0.005% to 0.03%, manganese (Mn): 1.0% to 2.5%, aluminum (Al): 0.2% to 0.8%, sum of chromium (Cr) and molybdenum (Mo): 0.3% to 1.5%, sum of niobium (Nb) and titanium (Ti): 0.001% to 0.01%, phosphorus (P): more than 0% to 0.02%, sulfur (S): more than 0% to 0.01%, and the balance of iron (Fe) and other unavoidable impurities, wherein a yield strength (YP) of 195 MPa or more, a tensile strength (TS) of 340 MPa or more, elongation (El) of 33% or more, and a bake hardening (BH) amount of 40 MPa or more are satisfied. La presente invención proporciona una hoja de acero laminado en frío resistente a la abolladura que tiene excelentes propiedades de resistencia a la abolladura. Según una modalidad de la presente invención, la lámina de acero laminado en frío resistente a la abolladura incluye, en peso, carbono (C): 0,005% a 0,03%, manganeso (Mn): 1,0% a 2,5%, aluminio (Al): 0,2% a 0,8%, suma de cromo (Cr) y molibdeno (Mo): 0,3% a 1,5%, suma de niobio (Nb) y titanio (Ti): 0,001% a 0,01%, fósforo (P): más de 0% a 0,02%, azufre (S): más de 0% a 0,01%, y el resto de hierro (Fe) y otras impurezas inevitables, con lo que se satisface un límite elástico (YP) de 195 MPa o superior, una resistencia a la tracción (ST) de 340 MPa o superior, un alargamiento (El) de 33% o superior, y una cantidad de endurecimiento por cocción (BH) de 40 MPa o superior.