An samar da bututu maras sumul a cikin yanki ɗaya, an soke shi kai tsaye daga zagaye na ƙarfe, ba tare da walda a saman ba, kuma yana da aikace-aikace iri-iri. Saboda aiki na musamman na bututun ƙarfe maras sumul, carbon structural steel, low alloy structural karfe, da dai sauransu ana amfani da su gabaɗaya don samarwa, ...
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