HIGH CARBON STEEL SHEET SUPERIOR IN FATIUGUE LIFEAND MANUFACTURING METHOD THEREOF

摘要

The present invention relates to a high carbon steel sheet that is superior in fatigue life and a method of manufacturing the high carbon steel sheet. The high carbon steel sheet includes about 0.75wt% to about 0.95wt% of carbon, smaller than about 1.8wt% of silicon, about 0.1 wt% to about 1.5wt% of manganese, about 0.1wt% ~1.0wt% of chromium, smaller than about 0.02wt% of phosphorus, smaller than about 0.02wt% of sulfur, a residual amount of iron, and inevitable impurities. A layer interval between laminar carbides included in the high carbon steel sheet is smaller than about 0.5µm. The high carbon steel sheet may include a fine pearlite having a lamellar structure. The fine pearlite included in the high carbon steel sheet may have a volume percentage of larger than about 90%. A ratio of length to width of the lamellar structure may be larger than about 10:1.