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(1)carbon steel:jis aisi / sae S45c 1045 S50c 1050 S60c / s65c 1065 S70c 1070 S75c 1075 (2)carbon tool steel:jis aisi / sae Sk85 ( sk5 ) 1085 Sk95 ( sk4 ) 1095 (3)alloy tool steel:JIS.