Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Steel wire rod
An FeO layer including fine crystal grains having random orientation is formed as inner layer scale on the surface of the steel wire rod containing C: 0.05-1.2 mass % (hereinafter referred to as “%”), Si: 0.01-0.50%, Mn: 0.1-1.5%, P: 0.02% or below, S: 0.02% or below, N: 0.005% or below, an Fe2SiO4 layer with the thickness: 0.01-1.0 μm is formed in the boundary face between the FeO layer of the inner layer scale and steel, and the thickness of the inner layer scale is 1-40% of the total scale thickness. In another aspect, the maximum grain size of the crystal grain of the inner layer scale is 5.0 μm or below and the average grain size is 2.0 μm or below.
Kobe Steel, Ltd.
Y C Y C C Y C C C C C
Y10T C22C Y10T C21D C21D Y10T C21D C22C C21D C21D C22C
additional inventional additional inventional inventional additional inventional inventional inventional inventional inventional
Masumi Hidenori Mikako Shohei Tomotada Takashi
Nishimura Sakai Takeda Nakakubo Maruo Onishi