Alloy 400 jẹ lilo pupọ ni ọpọlọpọ awọn aaye, paapaa sisẹ omi ati kemikali. Awọn ohun elo aṣoju jẹ awọn falifu ati awọn ifasoke; fifa ati awọn ọpa atẹgun; tona amuse ati fasteners; itanna ati itanna irinše; awọn orisun omi; kemikali processing ẹrọ; petirolu ati awọn tanki omi titun; epo robi stills, ilana ngba ati fifi ọpa; igbomikana feedwater igbona ati awọn miiran ooru exchangers; ati awọn igbona deaerating.