종래의 침탄 경화에서는 강도부족으로 인해 쇼트 피닝을 추가하였으며, 열처리 변형도 커서 사상의 추가공정이 필요했었다.
In the conventional carburizing hardening, shot peening was added due to lack of strength, and the heat treatment deformation was also large, requiring an additional process of finishing.