Patent ID: 8048237

Claim:
A high carbon hot rolled steel sheet comprising 0.2 to 0.7% C, 0.01 to 1.0% Si, 0.1 to 1.0% Mn, 0.03% or less P, 0.035% or less S, 0.08% or less Al, 0.01% or less N; by mass, and balance of iron and inevitable impurities; wherein mean grain size of ferrite is 20 μm or larger; the volume percentage of ferrite grains having 10 μm or smaller size is 20% or less; mean diameter of carbide is in a range from 0.10 μm to smaller than 2.0 μm; the percentage of carbide grains having 5 or more of aspect ratio is 15% or less; and the contact ratio of carbide is 20% or less.