Patent ID: 8071018

Claim:
A high carbon hot-rolled steel sheet which is a hot-rolled spheroidizing annealed material, comprising 0.2 to 0.7% C, 2% or less Si, 2% or less Mn, 0.03% or less P, 0.03% or less S, 0.08% or less Sol.Al., and 0.01% or less N, by mass, which contains carbide having a particle size of smaller than 0.5 Î¼m in a content of 15% or less by volume to the total amount of carbide, and the difference between the maximum hardness Hv max and the minimum hardness Hv min , Î”Hv (=Hv max âˆ’Hv min ) in the sheet thickness direction being 10 or smaller.