High carbon steel and production method thereof

Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt

Reexamination Certificate

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C148S603000, C148S651000

Reexamination Certificate

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07147730

ABSTRACT:
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.A high car 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 μm or larger exist in 2500 μm2, the ratio of number of carbides having a diameter of 0.6 μm or less with respect to all the carbides is 80% or more, and the Δr is more than −0.15 to less than 0.15, herein Δr=(r0+r90−2×r45)/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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JIS G 4051 (1979).
JIS G 4401 (1983).
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JIS G 4802:1999 (1999).
JIS G 4401:2000 (2000).

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