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炭素工具鋼.
炭素工具鋼(たんそこうぐこう、英語: carbon tool steel)は、鉄に炭素(C、0.55 - 1.50%)、ケイ素(Si、0.10 - 0.35%)、マンガン(Mn、0.10 - 0.50%)を含む炭素鋼である。キルド鋼を圧延または鍛造、据込み鍛錬することにより製造する。特に指定のない限り、鋼板および鋼帯は圧延のまま、それ以外は焼なましを行う。加工性がよく、熱処理により適当な機械的性質を得易い反面、焼き入れ性が悪く焼き入れ時のトラブルがあるため、その使用量は高合金工具鋼への移行により減少傾向にある。
炭素工具鋼材の日本産業規格 (JIS) に基づく識別は先立つ記号「SK」で行う。
JIS G 4401 炭素工具鋼鋼材
- SK140
- SK120
- SK105
- SK95
- SK90
- SK85
- SK80
- SK75
- SK70
- SK65
- SK60
JISと他規格の対応
JIS規格 |
旧JIS規格 |
ISO規格 |
ASTM規格 |
DIN規格
|
SK140
|
SK1 |
- |
W1-13 |
-
|
SK120
|
SK2 |
C120U |
W1-11 1/2 |
-
|
SK105
|
SK3 |
C105U |
W1-10 |
C105W1
|
SK95
|
SK4 |
- |
W1-9 |
-
|
SK90
|
- |
C90U |
- |
-
|
SK85
|
SK5 |
- |
W1-8 |
C80W1
|
SK80
|
- |
C80U |
- |
-
|
SK75
|
SK6 |
- |
W1-7 |
C80W1
|
SK70
|
- |
C70U |
- |
-
|
SK65
|
SK7 |
- |
- |
C70W2
|
SK60
|
- |
- |
- |
-
|
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