| 摘要 |
[Object] To provide a high carbon steel sheet having excellent hardenability and toughness, and low planar anisotropy of tensile properties affecting workability, and a method of producing the same. [Means for Solution] A high carbon steel sheet having chemical composition specified by JIS G 4051 (Carbon steels for machine structural use), JIS G 4401 (Carbon tool steels) or JIS G 4802 (Cold-rolled steel strips for springs), wherein more than 50 carbides having a diameter of 1.5 mum or larger exist in 2500 mum<2>, the ratio of number of carbides having a diameter of 0.6 mum or less with respect to all the carbides is 80% or more, and the Deltar is more than -0.15 to less than 0.15, herein Deltar=(r0+r90-2xr45)/4, and r0, r45, and r90 shows a r-value of the directions of 0° (L), 45° (S) and 90° (C) with respect to the rolling direction respectively.
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