| 摘要 |
PROBLEM TO BE SOLVED: To provide a polishing surface plate which shows desirable characteristics as to variation in flatness of the polishing surface plate itself, life, and amount of wear and has an excellent effect of avoiding flawing of the surface of a member to be polished. SOLUTION: A polishing surface plate is provided which is made from spheroidal graphite cast iron comprising spheroidal graphite with a graphite particle diameter of 100μm or less, present in a dispersed state with the number of graphite particles being 70 pieces/mm<2> or more, in a base material having a Vickers hardness number of 200 or more. |
