An raba layin dogo na karafa zuwa layin dogo, layin dogo masu sauki, layin dogo da kuma layin dogo.Siffar sashin layin dogo ya ƙunshi sashin mai siffa I tare da mafi kyawun aikin lankwasa, shugaban dogo, kugu na dogo da ƙasan dogo.
(1) jirgin kasa na karfe don titin jirgin kasa
Ana haɓaka ƙananan raƙuman ƙarfe na ƙarfe na ƙarfe bisa tushen dogo na carbon.High carbon da low gami karfe dogo yana da mafi girma ƙarfi, mafi ingancin juriya, matsa lamba juriya, gaggautsa juriya da gajiya karaya juriya fiye da carbon dogo.Irin layin dogo don amfani da layin dogo sune 38, 43, 50, 60 da 75kg/m, da dai sauransu. Ya kamata a ba da kulawa ta musamman don hana farar fata yayin samar da jirgin.
(2) Jirgin dogo na karfe mai haske
An fi amfani da shi a fannin hakar ma'adinai da gandun daji, kuma nau'ikansa sun kai 5,8,11,15,18 da 24 kg/m.Jirgin dogo mai haske na karfen carbon ne aka yi shi, kuma wasu kadan an yi su ne da karamin karfe.Wuraren ƙarfe masu haske da ake amfani da su a cikin ma'adinai, ƙarƙashin ƙasa da gandun daji suna buƙatar juriya na lalata, don haka abubuwan da suka dace kamar jan ƙarfe, chromium, phosphorus da vanadium ana ƙara su cikin ƙarfe.
(3) Jirgin dogo na karfe mai sarrafa
Jirgin dogo na karfe da ake amfani da shi don gudanar da wutar lantarki a cikin layin dogo na karkashin kasa yana bukatar kyakykyawan aiki, wato resistivity a 15℃ bai kai 0.125 μ ω m ba.An yi shi da ƙananan ƙarancin carbon aluminum kashe karfe.
(4) Crane karfe dogo
Tsarin sinadarai da tsarin kera na shingen shinge na musamman na dogo na karfe da ake amfani da su don hanyoyin jagorar crane daban-daban iri daya ne da na layin dogo na karfe.Irin su ne QU70, QU80, QUl00, QUl20 da sauransu