| abstract |
A medium- and high-carbon steel sheet according to one embodiment of the present invention is characterized by comprising 0.10 to 1.50% of C, 0.01 to 1.00% of Si, 0.01 to 3.00% of Mn, 0.0001 to 0.1000% of P, 0.0001 to 0.1000% of S, 0.1000%, and the remainder comprising Fe and impurities, wherein the volume percentage of martensite, bainite, pearlite and retained austenite combined is not more than 5%, and the remainder is a structure of ferrite and carbide , The spheroidizing ratio of the carbide particles is not less than 70% and not more than 99%, and the ratio of the number of the carbide grains including the crystal interface having an azimuth difference of 5 or more to the carbide grains is not more than 20% with respect to the total number of the carbide grains. |