| 摘要 |
PROBLEM TO BE SOLVED: To provide a minute particle iron bottom whose hardness has been improved so that the working surface of the iron bottom has an improve friction coefficient an is strong against scratches, and sliding on cloth is improved. SOLUTION: The working surface 4 has a granular state being deformed by the compression in a direction for orthogonally crossing the surface, and the number of metal dislocation per unit volume is large than that of the core of an iron bottom 2 at least by 40%.
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