CAST IRON ARTICLE AND METHOD OF MAKING SAME

摘要

A cast iron article having in a predetermined portion (11a) of a surface layer thereof a remelt-treated layer formed by way of a partial hardening treatment having a step adding, from among Cr, Mo, Ni, W, V, and Nb, one or more species of high-hardness metal through a plasma arc (12) into a substrate of the article (11) and a cooling step for solidification subsequent thereto. A method of making the cast iron article is also disclosed wherein the plasma arc (12) is discharged from the plasma torch (1) to the predetermined portion (11a) of the surface layer to form therein a molten pool (13), while supplying the highhardness metal as powdered adjacent the plasma arc (12).