Steel sheet having fatigue life for leaf spring and manufacturing method for the same

摘要

The steel sheet for plate sputter according to an aspect of the present invention, in weight %, carbon (C): 0.7 to 1.0%, silicon (Si): 0.1 to 0.4%, manganese (Mn): 0.2 to 1.0%, chromium (Cr) ): 0.05 to 2.0%, Vanadium (V): 0.07 to 0.2%, Phosphorus (P): 0.03% or less, Sulfur (S): 0.03% or less, remaining Fe and unavoidable impurities, including 99 area% in microstructure It contains more than pearlite and 1 area% or less (excluding 0%) of vanadium carbide (VC), and the average particle size of old austenite may be 28 μm or less.