由整塊金屬制(zhi)成的(de)，表面上沒有接縫(feng)的(de)鋼(gang)(gang)管(guan)(guan)(guan)(guan)，稱為無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)。根據生產方法，無(wu)(wu)縫(feng)管(guan)(guan)(guan)(guan)分熱軋管(guan)(guan)(guan)(guan)、冷軋管(guan)(guan)(guan)(guan)、冷拔管(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)等(deng)。按照斷面形(xing)(xing)狀(zhuang)，無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)分圓形(xing)(xing)和(he)異形(xing)(xing)兩種，異形(xing)(xing)管(guan)(guan)(guan)(guan)有方形(xing)(xing)、橢圓形(xing)(xing)、三角(jiao)形(xing)(xing)、六角(jiao)形(xing)(xing)、瓜(gua)子形(xing)(xing)、星形(xing)(xing)、 帶翅管(guan)(guan)(guan)(guan)多種復雜形(xing)(xing)狀(zhuang)。最大直(zhi)徑達650mm，最小(xiao)直(zhi)徑為 0.3mm。根據用(yong)途不同， 有厚壁(bi)管(guan)(guan)(guan)(guan)和(he)薄壁(bi)管(guan)(guan)(guan)(guan)。無(wu)(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)主要用(yong)做(zuo)石(shi)油地質鉆探管(guan)(guan)(guan)(guan)、石(shi)油化工用(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(ji)汽車(che)、拖(tuo)拉(la)機、航空(kong)用(yong)高精度結構鋼(gang)(gang)管(guan)(guan)(guan)(guan)。