Nippon Steel Corporation

Haruo Shimada

Yoshiaki Sakakibara

Jiro Kondo

Shinji Tokumaru

Akihito Kiyose

Atsushi Nogami

Ryuji Watanabe

Takashi Waseda

It is possible to produce high purity Si by heating solid SiO at a temperature of at least 1000&deg; C. and lower than 1730&deg; C., for a disproportionation reaction in which the SiO solid is decomposed to liquid or solid Si and solid SiO , and the produced Si is separated from the SiO and/or SiO. The SiO solid can be obtained by a process whereby a starting mixture of carbon C, silicon Si or ferrosilicon, or a combination thereof, with SiO is heated to generate SiO gas-containing gas, and the SiO-containing gas is cooled to produce SiO solid.

Production process and apparatus for high purity silicon

A high-purity reinforcing steel resistant to salt and capable of preventing deterioration of concrete substantially completely over a long period when the salt content of the concrete is not greater than 0.5 wt % in terms of Nacl amount in the sand of concrete. The reinforcing steel essentially consists of 0.001 to 1.0 wt % of C, less than 0.01 wt % of Si, 0.01 to 2.0 wt % of Mn, less than 0.015 wt % of P, less than 0.005 wt % of S, 0.01 to 0.5 wt % of Cu, 0.01 to 0.5 wt % of W, 0.001 to 0.10 wt % of Al and the balance Fe and incidental impurities. Disclosed also is another reinforcing steel capable of remarkably retarding deterioration of concrete even under such a severe corrosive condition that the salt content of the concrete exceeds 0.5 wt % in terms of Nacl amount in the same of concrete. This reinforcing steel essentially consists of 0.001 to 1.0 wt % of C, not greater than 0.05 wt % of Si, 0.01 to 2.0 wt % of Mn, less than 0.015 wt % of P, less than 0.005 wt % of S, 1.0 to 5.5 wt % of Ni, 0.001 to 0.5 wt % of W, 0.001 to 0.1 wt % of Al and the balance Fe and incidental impurities.

Reinforcing steel having resistance to salt and capable of preventing

A non-magnetic steel composition suitable for use in various steel and concrete structures, particularly magnetic floating high-speed railways, nuclear fusion facilities and marine structures and appliances where non-magnetic property is required. The steel composition contains

Seawater-corrosion-resistant non-magnetic steel materials

A non-magnetic steel material suitable for use in various steel and concrete structures such as magnetic floating high-speed railways, nuclear fusion facilities and marine structrures and appliances where non-magnetic properties are required. The steel composition contain (by weight):

Concrete reinforcing steel bars or wires useful for reinforcing concrete structures, such as concrete structures built on seashores and marine concrete structures, and concrete bridges, which are exposed to sea salt particles and sea-water splashes, and very excellent in preventing deteriorations or decays of these concrete structures. The steel bars or wires have the following composition,

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Kawasaki, Japan

Haruo Shimada