Case hardened articles starting as low carbon steel can also be labeled hardened steel.
WIPO ASSIGNS PATENT TO KABUSHIKI KAISHA KOBE SEIKO SHO FOR "STEEL FOR MACHINE STRUCTURAL USE, MANUFACTURING METHOD FOR SAME, CASE HARDENED STEEL COMPONENTS, AND MANUFACTURING METHOD FOR SAME" (AMERICAN INVENTORS)
Apr 15, 2011; GENEVA, April 15 -- Publication No. WO/2011/040587 was published on April 07. Title of the invention: "STEEL FOR MACHINE...