Hypereutectoid steel

Japanese: 過共析鋼 - かきょうせきこう
Hypereutectoid steel

…Tools include hand tools such as scissors, knives, razors, saws, planes, chisels, sickles, as well as tools for grinding metal materials, and dies and rolling rolls for plastic processing. The steel used for hand tools (knife steel) is mainly carbon steel called hypereutectoid steel, which has a carbon content of about 1%. For knives, scissors, razors, etc., 13 chromium stainless steel or high-grade knife stainless steel with molybdenum added is often used. …

From [Phase transformation]

...As a result, the microstructure at room temperature is either pro-eutectoid ferrite and pearlite or pro-eutectoid cementite and pearlite. The former is called hypo-eutectoid steel, and the latter is called hyper-eutectoid steel.
[Transformation curve]
A diagram showing the types and amounts of phases produced during heat treatment versus time and temperature is called a transformation curve.

*Some of the terminology that refers to "hypereutectoid steel" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…工具としては,はさみ,包丁,かみそり,のこぎり,かんな,のみ,鎌などの手工具,金属材料を研削するためのバイト類や,塑性加工するためのダイスや圧延ロールなどがある。 手工具に用いられる鋼(刃物鋼)は炭素量1%前後の過共析鋼と呼ばれる炭素鋼が主である。包丁,はさみ,かみそりなどには,しばしば,13クロムステンレス鋼や,これにモリブデンを添加した高級刃物用ステンレス鋼が使用される。…

【相変態】より

…この結果,常温での組織は,初析のフェライトとパーライトまたは初析のセメンタイトとパーライトとなる。前者を亜共析鋼hypo‐eutectoid steel,後者を過共析鋼hyper‐eutectoid steelという。
[変態曲線]
 熱処理において生成する相の種類とその量を時間軸と温度軸に対して示した図を変態曲線という。…

※「過共析鋼」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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