Metal treatment – Stock – Ferrous
Reexamination Certificate
2005-09-20
2005-09-20
Yee, Deborah (Department: 1742)
Metal treatment
Stock
Ferrous
C148S333000, C148S334000, C148S335000, C148S328000, C148S318000, C148S654000, C148S232000
Reexamination Certificate
active
06946038
ABSTRACT:
A weldable structural steel product having fine complex precipitates of TiN and MnS is provided which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.05% Si, 1.0 to 2.5% Mn, 0.05 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% B, 0.001 to 0.2% W, at most 0.03% P, 0.003 to 0.05% S, at most 0.005% O, and balance Fe and incidental impurities while satisfying conditions of 1.2≦Ti/N≦2.5, 10≦N/B≦40, 2.5≦Al/N≦7, 6.5≦(Ti+2Al+4B)/N≦14, and 220≦Mn/S≦400. The steel has a microstructure consisting essentially of a complex structure of ferrite and pearlite having a grain size of 20 μm or less.
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Choi Hae-Chang
Choo Wung-Yong
Jeong Hong-Chul
Posco
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
Yee Deborah
LandOfFree
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