Diameter tube kuma aka sani da girman kai, diameter tube, diameter kai tsaye. Daya daga cikin chemical bututun kayan aiki don haɗin tsakanin bututun biyu daban-daban diamita. Dangane da bambancin siffofin, an raba su zuwa ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan ƙananan. Size shugaban kayan hada da bakin karfe size shugaban, halitta karfe, carbon karfe size shugaban, size shugaban kayan ne 20 karfe, Q235, Q345, 16Mn da sauransu.

Size shugaban (diameter bututu) ne wani nau'i na bututun da aka yi amfani da bututun diameters. Yawancin hanyoyin da ake amfani da su shine matsa lamba, matsa lamba ko matsa lamba da matsa lamba, wasu ƙayyadaddun ƙayyadaddun bututun diamita za a iya amfani da matsa lamba.

Tsarin shrinkage ƙirƙirar babban kai shine sanya tubu mai daidai da diamita na babban ƙarshen babban kai a cikin ƙirƙirar ƙirar, ta hanyar matsawa a gaban shugabancin axial na tubu mai ƙirƙirar, don karfe ya motsa a gaban ƙirar ƙirar da rage ƙirƙirar. Dangane da girman bambance-bambance na heterogeneous tube, an raba shi zuwa ɗaya matsa matsa matsa matsa ko sau da yawa matsa matsa matsa. Baya ga amfani da karfe bututu don samar da girman kai ga albarkatun kasa, wani ɓangare na ƙayyadaddun bayanai girman kai kuma za a iya samar da karfe farantin ta amfani da stamping tsari. Stretching da aka yi amfani da stamping siffar da aka tsara bisa ga girman kai ciki surface size, da stamping da aka yi amfani da karfe farantin stamping bayan laying