ULTRA-HIGH STERNGTH STEEL WIRE ROD, STEEL WIRE AND MANUFACTURING METHOD THEREOF FOR TIRE CORD

摘要

The present specification relates to an ultra-high-strength wire, a steel wire, and a manufacturing method thereof, and more particularly, an ultra-high-strength wire, a steel wire, and a method for manufacturing the same that can be applied to a tire cord. According to an embodiment of the disclosed ultra-high strength tire cord wire rod, in wt%, C: 1.0 to 1.2%, Si: 0.2 to 0.8%, Mn: 0.2 to 0.6%, Cr: 0.2 to 0.8%, Ni: 0.2 to 0.2% 0.5%, Co: 0.2 to 0.5%, P: 0.015% or less, S: 0.015% or less, remaining Fe and other impurities, and the value of the following formula (1) is 340 or more. (1) 301C + 19.7Si + 56.7Cr In the above formula (1), C, Si, and Cr mean the content (% by weight) of each alloy element.