Hot birgima carbon karfe zagaye sanduna, kamar 15#, 20#, 35#, 45#, 50#, 55#, da kuma 60#, ana amfani da ko'ina a daban-daban masana'antu saboda m inji Properties da versatility. Waɗannan lambobin yawanci suna wakiltar abun cikin carbon ko wasu ƙayyadaddun kaddarorin ƙarfe, kuma ana danganta su da makin ƙarfe na China.
Waɗannan sandunan da aka yi birgima mai zafi na carbon karfe an san su don ƙarfinsu mai ƙarfi, injina mai kyau, da weldability, yana sa su dace da aikace-aikace kamar shafts, axles, gears, da sauran kayan aikin injin. Ana amfani da su sau da yawa wajen kera sassan motoci, kayan aikin gona, da kayan aikin injiniya gabaɗaya.