High strength, high toughness, high carbon steel wire rod...

Metal treatment – Stock – Ferrous

Reexamination Certificate

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C148S333000, C148S336000, C420S125000

Reexamination Certificate

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07462250

ABSTRACT:
The present invention provides a high strength, high toughness steel wire rod useful for a PC steel wire, galvanized steel strands, spring use steel wire, cables for suspension bridges, etc. By hot rolling, then directly patenting or reaustenitizing, then patenting a high carbon steel wire rod of a specific chemical composition of the steel and chemical composition, size, and numerical density of inclusions, piano wire rod or high carbon steel wire rod having a structure of mainly pearlite, having an average value of the proeutectoid cementite area ratio of 5% or less in a center region of less than 20% of the wire rod diameter from the center of the wire rod, having a micromartensite size of the C section of 100 μm or less, having a tensile strength of the 170 kgf/mm2class or more, and having a drawing ratio at break of 30% or more is obtained.

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Computer-generated English translation of Japanese patent 2002-321043, Sugano Koji, May 11, 2002.
European Search Report dated Sep. 7, 2007, EP 04 70 5540.
Patent Abstracts Of Japan—JP 06-299286, Oct. 25, 1994.
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Patent Abstracts of Japan—JP 09-287015, Nov. 4, 1997.
“Influence Of The Reduction of Cord Steel On The Nonmetallic Oxide Inclusions”,Steel In Translation, vol. 32, No. 5, pp. 29-35, 2002, B.V. Linchevskii, et al.

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