Metal treatment – Stock – Ferrous
Reexamination Certificate
2004-01-27
2008-12-09
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S333000, C148S336000, C420S125000
Reexamination Certificate
active
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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Kajitani Toshiyuki
Komiya Nobuyuki
Muroga Nariyasu
Nishida Seiki
Nishikawa Yoshitaka
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
LandOfFree
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