無(wu)(wu)縫鋼(gang)管(guan)(guan)(guan)由(you)整塊金屬制成的，表面(mian)上沒(mei)有接縫的鋼(gang)管(guan)(guan)(guan)，稱為無(wu)(wu)縫鋼(gang)管(guan)(guan)(guan)。根據生(sheng)產方(fang)法，無(wu)(wu)縫管(guan)(guan)(guan)分熱軋管(guan)(guan)(guan)、冷軋管(guan)(guan)(guan)、冷拔管(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)、頂管(guan)(guan)(guan)等。按照斷面(mian)形(xing)狀，無(wu)(wu)縫鋼(gang)管(guan)(guan)(guan)分圓形(xing)和(he)異(yi)形(xing)兩(liang)種，異(yi)形(xing)管(guan)(guan)(guan)有方(fang)形(xing)、橢圓形(xing)、三角形(xing)、六角形(xing)、瓜子形(xing)、星形(xing)、 帶翅管(guan)(guan)(guan)多種復雜形(xing)狀。最大直(zhi)徑達(da)650mm，最小(xiao)直(zhi)徑為 0.3mm。根據用(yong)途(tu)不同， 有厚壁管(guan)(guan)(guan)和(he)薄(bo)壁管(guan)(guan)(guan)。無(wu)(wu)縫鋼(gang)管(guan)(guan)(guan)主(zhu)要用(yong)做石油(you)地(di)質鉆探管(guan)(guan)(guan)、石油(you)化工(gong)用(yong)的裂化管(guan)(guan)(guan)、鍋 爐管(guan)(guan)(guan)、軸承管(guan)(guan)(guan)以及汽車、拖拉機、航空用(yong)高精度結構鋼(gang)管(guan)(guan)(guan)。