厚(hou)壁鋼(gang)(gang)管(guan)(guan)(guan)(guan)，把鋼(gang)(gang)管(guan)(guan)(guan)(guan)外徑和壁厚(hou)之(zhi)比(bi)小于20的(de)鋼(gang)(gang)管(guan)(guan)(guan)(guan)稱為(wei)厚(hou)壁鋼(gang)(gang)管(guan)(guan)(guan)(guan)。主要用(yong)做石油(you)地(di)質(zhi)鉆探管(guan)(guan)(guan)(guan)、石油(you)化工用(yong)的(de)裂化管(guan)(guan)(guan)(guan)、鍋爐管(guan)(guan)(guan)(guan)、軸承管(guan)(guan)(guan)(guan)以及汽車、拖拉機、航空(kong)用(yong)高精度結構管(guan)(guan)(guan)(guan)等。