無縫(feng)(feng)鋼管(guan)(guan)是(shi)用(yong)鋼錠或實心管(guan)(guan)坯經(jing)穿孔制成毛管(guan)(guan)，然后經(jing)熱軋、冷軋或冷撥制成。無縫(feng)(feng)鋼管(guan)(guan)在(zai)我國(guo)鋼管(guan)(guan)業(ye)中具有重要(yao)的(de)(de)地位。據不(bu)完(wan)全統計(ji)，我國(guo)現有無縫(feng)(feng)管(guan)(guan)生產(chan)(chan)企業(ye)約240多(duo)家，無縫(feng)(feng)鋼管(guan)(guan)機組約250多(duo)套，年產(chan)(chan)能(neng)力(li)約450多(duo)萬(wan)噸。從口徑看(kan)，＜φ76的(de)(de)，占(zhan)35%，＜φ159-650的(de)(de)，占(zhan)25%。從品(pin)種看(kan)，一般用(yong)途(tu)管(guan)(guan)190萬(wan)噸，占(zhan)54%；石油(you)管(guan)(guan)76萬(wan)噸，占(zhan)5.7%；液(ye)壓(ya)支柱、精(jing)密管(guan)(guan)15萬(wan)噸，占(zhan)4.3%；不(bu)銹管(guan)(guan)、軸承管(guan)(guan)、汽車管(guan)(guan)共5萬(wan)噸，占(zhan)1.4%。

軋制無縫管(guan)(guan)(guan)的(de)原(yuan)料(liao)是(shi)圓(yuan)(yuan)管(guan)(guan)(guan)坯，圓(yuan)(yuan)管(guan)(guan)(guan)胚(pei)要經(jing)(jing)過(guo)(guo)切割機(ji)(ji)(ji)的(de)切割加工(gong)成長度約為(wei)(wei)1米的(de)坯料(liao)，并(bing)經(jing)(jing)傳送帶(dai)送到熔爐內(nei)加熱。鋼(gang)(gang)(gang)坯被送入(ru)(ru)(ru)熔爐內(nei)加熱，溫度大約為(wei)(wei)1200攝氏度。燃料(liao)為(wei)(wei)氫氣或(huo)(huo)乙炔。爐內(nei)溫度控制是(shi)關鍵性(xing)的(de)問題.圓(yuan)(yuan)管(guan)(guan)(guan)坯出(chu)爐后(hou)要經(jing)(jing)過(guo)(guo)壓(ya)力穿孔(kong)(kong)(kong)機(ji)(ji)(ji)進行穿空。一般較常(chang)見的(de)穿孔(kong)(kong)(kong)機(ji)(ji)(ji)是(shi)錐形輥(gun)穿孔(kong)(kong)(kong)機(ji)(ji)(ji)，這種穿孔(kong)(kong)(kong)機(ji)(ji)(ji)生(sheng)產(chan)(chan)效(xiao)率高(gao)，產(chan)(chan)品質量(liang)好(hao)，穿孔(kong)(kong)(kong)擴徑(jing)(jing)量(liang)大，可穿多種鋼(gang)(gang)(gang)種。穿孔(kong)(kong)(kong)后(hou)，圓(yuan)(yuan)管(guan)(guan)(guan)坯就(jiu)先(xian)后(hou)被三(san)輥(gun)斜軋、連軋或(huo)(huo)擠(ji)壓(ya)。擠(ji)壓(ya)后(hou)要脫管(guan)(guan)(guan)定(ding)徑(jing)(jing)。定(ding)徑(jing)(jing)機(ji)(ji)(ji)通過(guo)(guo)錐形鉆頭(tou)高(gao)速旋轉(zhuan)入(ru)(ru)(ru)鋼(gang)(gang)(gang)胚(pei)打孔(kong)(kong)(kong)，形成鋼(gang)(gang)(gang)管(guan)(guan)(guan)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)內(nei)徑(jing)(jing)由定(ding)徑(jing)(jing)機(ji)(ji)(ji)鉆頭(tou)的(de)外徑(jing)(jing)長度來確定(ding)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)(jing)定(ding)徑(jing)(jing)后(hou)，進入(ru)(ru)(ru)冷(leng)卻(que)塔中，通過(guo)(guo)噴(pen)水(shui)冷(leng)卻(que)，鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)(jing)冷(leng)卻(que)后(hou)，就(jiu)要被矯(jiao)直。鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)(jing)矯(jiao)直后(hou)由傳送帶(dai)送至金屬探(tan)傷機(ji)(ji)(ji)（或(huo)(huo)水(shui)壓(ya)實驗）進行內(nei)部探(tan)傷。若鋼(gang)(gang)(gang)管(guan)(guan)(guan)內(nei)部有裂紋，氣泡等(deng)(deng)問題，將被探(tan)測出(chu)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)質檢后(hou)還要通過(guo)(guo)嚴格(ge)的(de)手工(gong)挑選。鋼(gang)(gang)(gang)管(guan)(guan)(guan)質檢后(hou)，用油漆噴(pen)上編號、規(gui)格(ge)、生(sheng)產(chan)(chan)批號等(deng)(deng)。并(bing)由吊(diao)車吊(diao)入(ru)(ru)(ru)倉庫中。