Akwai nau'ikan nau'ikan nau'ikan bututu (smls) na samarwa bisa ga tsarin samar da bututun ƙarfe mara nauyi. Duk da haka, ba tare da la'akari da mirgina, extrusion, saman latsawa ko kadi sumul karfe tube masana'antu tsari, da billet dumama kayan aiki ne maras rabuwa, don haka billet ...
Kara karantawa