Patents by Inventor Tsuneo Kawachi

Tsuneo Kawachi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Refining agent of molten metal and methods for producing the same
    Patent number: 4435210
    Abstract: The present invention relates to a refining agent used for deoxidation, desulfurization, and dephosphorization of molten steel by a ladle refining, as well as methods for producing such a refining agent. The general practice in ladle refining is to use for the refining agent both so-called flux, which is mainly composed of CaO, and a Ca-based metallic additive.In conventional practice, the flux and the Ca-based metallic additive are added to the molten steel separately.It is an object of the present invention to provide a refining agent, wherein the flux and metallic CaO component act highly effectively on the molten metal.A refining agent for metal according to the present invention essentially consists of: a Ca alloy, which essentially consists of Ca and at least one element selected from the group consisting of Al and Si, and a flux mainly composed of CaO and Al.sub.2 O.sub.3, the Ca-alloy phases and the flux phases being integrally bonded to one another.
    Type: Grant
    Filed: February 14, 1983
    Date of Patent: March 6, 1984
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Norio Hirokawa, Tsuneo Kawachi, Hiroshi Saito, Ryoichi Yoshimura