Pack carburizing

...Steel made by carburizing is called case-hardened steel. (1) Solid carburizing method: Generally, charcoal powder is mixed with about 20-40% barium carbonate (BaCO _{3 )} as an accelerator, sodium carbonate (Na ₂ CO _{3 )} , and a binder to form granules, which are then packed into a carburizing box made of ordinary steel or heat-resistant steel together with the workpiece, sealed with clay, and both the box and the box are heated to 850-950°C in a furnace for several hours. A high carbon concentration is created on the surface, but the carbon content in the core remains almost unchanged. ...

*Some of the terminology that refers to "pack carburizing" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…なお，浸炭によって造られた鋼を肌焼鋼という。(1)固体浸炭法pack carburizing　一般には木炭の粉に促進剤として約20～40％の炭酸バリウムBaCO₃，炭酸ナトリウムNa₂CO₃および粘結剤を混ぜて粒状にし，普通鋼あるいは耐熱鋼製の浸炭箱に被処理物と一緒に詰め，粘土などで密閉して，浸炭箱とも炉中で850～950℃に数時間加熱保持する。表層に炭素濃度の濃い部分ができるが，芯部の炭素量はほとんど変化しない。…

※「pack carburizing」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