| 摘要 |
PURPOSE:To provide a metal material having excellent etching property in which fast etching can be done preferentially in the thickness direction of the sheet by forming a cast structure in at least a part of the metal material and specifying the dislocation density. CONSTITUTION:The metal material has excellent etching property and has a cast structure such as dendrite structure in at least a part of the material and has >=10<2> dl/cm<2>, more preferably 10<4>-10<11>dl/cm<2> dislocation density. In this material, precise etching can be performed. The cast structure is formed by rapid cooling at >=100 deg.C/sec cooling rate by a single roll method or twin roll method and is preferably formed in the surface layer to a thickness about >=1/10 of the sheet thickness. The dislocation density above specified is obtd. by rolling under proper conditions. Thereby, wettability for an etching liquid and mechanical strength of the sheet for etching can be improved. |
