Bututun ƙarfe mara ƙarfi yana ratsawa da duk karfen zagaye, saman bututun ƙarfe ba tare da walda ba, wanda ake kira bututun ƙarfe mara nauyi.Bisa ga samar da hanya, sumul karfe tube za a iya raba zafi birgima sumul karfe tube, sanyi birgima sumul karfe tube, sanyi kõma sumul karfe tube, extruded sumul karfe tube, bututu jacking, da dai sauransu bisa ga siffar sashe, sumul karfe tube. tube ya kasu kashi zagaye da siffa ta musamman, bututu mai siffa ta musamman yana da murabba'i, murabba'i, alwatika, hexagonal, iri guna, tauraro, bututu mai fuka-fuki da nau'ikan sifofi iri-iri.Matsakaicin diamita shine 900mm kuma mafi ƙarancin diamita shine 4mm.Dangane da amfani daban-daban, akwai bututun ƙarfe maras kauri da bango mai kauri da bututun ƙarfe mara nauyi.Sumul karfe bututu ne yafi amfani da man fetur geology hakowa bututu, petrochemical fatattaka bututu, tukunyar jirgi bututu, hali bututu da mota, tarakta, jirgin sama high-daidaici tsarin karfe bututu.
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