Babban diamita carbon karfe bututu bayani dalla-dalla ana bayyana ta waje diamita, bango kauri, tsawon, da abu sa. Matsakaicin diamita na waje yawanci suna daga 200 mm zuwa 3000 mm. Irin waɗannan manyan nau'ikan suna ba su damar jigilar manyan kwararar ruwa da ba da tallafi na tsari, masu mahimmanci ga manyan ayyuka.
Hot-birgima karfe bututu tsaye a waje domin ta samar tsari abũbuwan amfãni: high-zazzabi mirgina karfe billets cikin bututu tare da uniform kauri bango da kuma m ciki tsarin. Ana iya sarrafa juriyar diamita na waje a cikin ± 0.5%, yana mai da shi dacewa da ayyukan tare da buƙatu masu ƙarfi, kamar bututun tururi a cikin manyan shuke-shuken wutar lantarki da cibiyoyin dumama birane.
Q235 carbon karfe bututukumaA36 carbon karfe bututusuna da fayyace ƙayyadaddun iyakoki don maki daban-daban na kayan aiki.
1.Q235 karfe bututu: Q235 karfe bututu ne na kowa carbon tsarin karfe bututu a kasar Sin. Tare da ƙarfin yawan amfanin ƙasa na 235 MPa, ana samar da shi a cikin kauri na bango na 8-20 mm kuma ana amfani dashi da farko don aikace-aikacen jigilar ruwa mai ƙarancin matsa lamba, kamar samar da ruwa na birni da magudanar ruwa, da bututun iskar gas na masana'antu gabaɗaya.
2.A36 carbon karfe bututu: A36 carbon karfe bututu ne na al'ada karfe sa a cikin kasa da kasa kasuwa. Yana da ɗan ƙaramin ƙarfin yawan amfanin ƙasa (250MPa) kuma mafi kyawun ductility. Babban nau'in diamita (yawanci tare da diamita na waje na 500mm ko fiye) ana amfani dashi sosai a cikin tattara mai da iskar gas da bututun sufuri, waɗanda ke buƙatar jure wasu matsa lamba da canjin yanayin zafi.