| 摘要 |
PURPOSE:To obtain a link chain excellent in anti-wear property in the necessary part thereof, by a method wherein a corrosion resistant metal layer is formed on the surface of a matrix metarial other than the mutual contact parts of a link and carbontriding treatment is carried out to form a surface hardened layer to the contacts parts and the corrosion resistant layer on the surface layer other than said contact parts. CONSTITUTION:A corrosion resistant metal layer 10 is formed on the surface of a matrix material 5 of each link forming a link chain other than mutual contact parts of said link 3 by Ni plating. Subsequently, carburization or carbonitriding treatment is carried out and tempering and annealing are succeedingly carried out. By this method, a surface hardened layer 7 is formed only to the contact part 4 of the surface layer part of the matrix material having an annealed martensite structure and a difusion and penetration layer 9 of a corrosion resistant metal and the corrosion resistant metal layer 10 are successively formed to the surface layer part of the matrix material 5 other than the contact part 4. By this method, a link chain having anti-wear property imparted to the mutual contact part 4 of the link 3 thereof and toughness possessed by the other part thereof including a welded part and high in strength against bending force is obtained. |
