Carbon steel
JIS AISI / SAE
S45C 1045
S50C 1050
S60C / S65C1065
S70C 1070
S75C 1075
(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.