Alloys or metallic compositions – Ferrous – Copper containing
Reexamination Certificate
2011-04-12
2011-04-12
Yee, Deborah (Department: 1733)
Alloys or metallic compositions
Ferrous
Copper containing
C420S090000, C420S091000, C420S092000, C420S104000, C420S107000, C148S320000, C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S603000, C148S651000
Reexamination Certificate
active
07922968
ABSTRACT:
Provided are a steel sheet for an automotive muffler and a method for producing the steel sheet. The steel sheet includes 0.01% by weight or less of C, 0.1 to 0.3% by weight of Si, 0.3 to 0.5% by weight of Mn, 0.015% by weight or less of P, 0.015% or less by weight of S, 0.02 to 0.05% by weight of Al, 0.004% or less of N, 0.2 to 0.6% by weight of Cu, 0.01 to 0.04% by weight of Co, and a remainder of Fe and unavoidable impurities. The method includes 0.01% by weight or less of C, 0.1 to 0.3% by weight of Si, 0.3 to 0.5% by weight of Mn, 0.015% by weight or less of P, 0.015% or less by weight of S, 0.02 to 0.05% by weight of Al, 0.004% or less of N, 0.2 to 0.6% by weight of Cu, 0.01 to 0.04% by weight of Co, and a remainder of Fe and unavoidable impurities, preparing a hot rolled steel sheet by re-heating the steel slab and by, during a finish rolling process, hot-rolling the steel slab at a temperature that is an Ar3 transformation temperature or more, preparing a cold rolled steel sheet by cold-rolling the hot rolled steel sheet with a cold reduction ratio of 50 to 90%, and performing a continuous annealing for the cold rolled steel sheet at a temperature of 500 to 900° C.
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Kim Jai-Ik
Lee Seung-hee
Son Hee-Man
Son Won-Ho
Yoon Jeong-Bong
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
POSCO
Yee Deborah
LandOfFree
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