METAL CHUNK FOR IMPACT PRESSING, METHOD FOR MANUFACTURING METAL CHUNK FOR IMPACT PRESSING, METAL CYLINDRICAL BODY, METHOD FOR MANUFACTURING METAL CYLINDRICAL BODY, CONDUCTIVE SUBSTRATE FOR ELECTROPHOTOGRAPHIC PHOTORECEPTOR, ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE AND IMAGE FORMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a metal chunk for impact pressing, with which a metal cylindrical body in which deviation in thickness (deviated thickness) caused by impact pressing is inhibited can be acquired.SOLUTION: In a metal chunk for impact pressing, maximum height roughness Rz of a male mold contact face with which a male mold of the male mold and female mold that are used for impact pressing comes into contact is 20 μm or more and 50 μm or less, and an average length RSm of a roughness curve element of the male mold contact face is 150 μm or more and 400 μm or less.SELECTED DRAWING: Figure 1