無(wu)縫(feng)鋼(gang)管(guan)是(shi)用(yong)鋼(gang)錠(ding)或(huo)實(shi)心(xin)管(guan)坯(pi)經(jing)穿(chuan)孔(kong)製(zhi)成(cheng)毛(mao)管(guan)，然(ran)後(hou)經(jing)熱(re)軋(ga)、冷(leng)軋(ga)或(huo)冷(leng)撥(bo)製(zhi)成(cheng)。無(wu)縫(feng)鋼(gang)管(guan)在(zai)我(wo)國(guo)鋼(gang)管(guan)業(ye)中(zhong)具(ju)有(you)重(chong)要(yao)的(di)地(de)位(wei)。據(ju)不(bu)完(wan)全(quan)統(tong)計(ji)，我(wo)國(guo)現(xian)有(you)無(wu)縫(feng)管(guan)生(sheng)產(chan)企(qi)業(ye)約(yao)240多(duo)家(jia)，無(wu)縫(feng)鋼(gang)管(guan)機(ji)組(zu)約(yao)250多(duo)套(tao)，年(nian)產(chan)能(neng)力(li)約(yao)450多(duo)萬(mo)噸(dun)。從(zong)口(kou)徑(jing)看(kan)，<φ76的(di)，占(zhan)35%，<φ159-650的(di)，占(zhan)25%。從(zong)品(pin)種(zhong)看(kan)，一(yi)般(pan)用(yong)途(tu)管(guan)190萬(mo)噸(dun)，占(zhan)54%;石(dan)油(you)管(guan)76萬(mo)噸(dun)，占(zhan)5.7%;液(ye)壓(ya)支(zhi)柱(zhu)、精(jing)密(mi)管(guan)15萬(mo)噸(dun)，占(zhan)4.3%;不(bu)鏽(xiu)管(guan)、軸(zhou)承(cheng)管(guan)、汽(qi)車(ju)管(guan)共(gong)5萬(mo)噸(dun)，占(zhan)1.4%。

　　軋(ga)製(zhi)無(wu)縫(feng)管(guan)的(di)原(yuan)料(liao)是(shi)圓(yuan)管(guan)坯(pi)，圓(yuan)管(guan)胚(pei)要(yao)經(jing)過(guo)切(qie)割(ge)機(ji)的(di)切(qie)割(ge)加(jia)工(gong)成(cheng)長(zhang)度(duo)約(yao)為(wei)1米(mi)的(di)坯(pi)料(liao)，並(bing)經(jing)傳(zhuan)送(song)帶(dai)送(song)到(dao)熔(rong)爐(lu)內(nei)加(jia)熱(re)。鋼(gang)坯(pi)被(bei)送(song)入(ru)熔(rong)爐(lu)內(nei)加(jia)熱(re)，溫(wen)度(duo)大(dai)約(yao)為(wei)1200攝(she)氏(zhi)度(duo)。燃(ran)料(liao)為(wei)氫(qing)氣(qi)或(huo)乙(zhe)炔(gui)。爐(lu)內(nei)溫(wen)度(duo)控(kong)製(zhi)是(shi)關(guan)鍵(jian)性(xing)的(di)問(wen)題(ti).圓(yuan)管(guan)坯(pi)出(chu)爐(lu)後(hou)要(yao)經(jing)過(guo)壓(ya)力(li)穿(chuan)孔(kong)機(ji)進(jin)行(hang)穿(chuan)空(kong)。一(yi)般(pan)較(jiao)常(chang)見(xian)的(di)穿(chuan)孔(kong)機(ji)是(shi)錐(zhui)形(xing)輥(gun)穿(chuan)孔(kong)機(ji)，這(zhe)種(zhong)穿(chuan)孔(kong)機(ji)生(sheng)產(chan)效(xiao)率(shuai)高(gao)，產(chan)品(pin)質(zhi)量(liang)好(hao)，穿(chuan)孔(kong)擴(kuo)徑(jing)量(liang)大(dai)，可(ke)穿(chuan)多(duo)種(zhong)鋼(gang)種(zhong)。穿(chuan)孔(kong)後(hou)，圓(yuan)管(guan)坯(pi)就(jiu)先(xian)後(hou)被(bei)三(san)輥(gun)斜(xie)軋(ga)、連(lian)軋(ga)或(huo)擠(ji)壓(ya)。擠(ji)壓(ya)後(hou)要(yao)脫(tuo)管(guan)定(ding)徑(jing)。定(ding)徑(jing)機(ji)通(tong)過(guo)錐(zhui)形(xing)鑽(zuan)頭(tou)高(gao)速(su)旋(xuan)轉(zhuan)入(ru)鋼(gang)胚(pei)打(da)孔(kong)，形(xing)成(cheng)鋼(gang)管(guan)。鋼(gang)管(guan)內(nei)徑(jing)由(you)定(ding)徑(jing)機(ji)鑽(zuan)頭(tou)的(di)外(wai)徑(jing)長(zhang)度(duo)來(lai)確(que)定(ding)。鋼(gang)管(guan)經(jing)定(ding)徑(jing)後(hou)，進(jin)入(ru)冷(leng)卻(que)塔(ta)中(zhong)，通(tong)過(guo)噴(pen)水(shui)冷(leng)卻(que)，鋼(gang)管(guan)經(jing)冷(leng)卻(que)後(hou)，就(jiu)要(yao)被(bei)矯(jiao)直(zhi)。鋼(gang)管(guan)經(jing)矯(jiao)直(zhi)後(hou)由(you)傳(zhuan)送(song)帶(dai)送(song)至(zhi)金(jin)屬(zhu)探(tan)傷(shang)機(ji)(或(huo)水(shui)壓(ya)實(shi)驗(yan))進(jin)行(hang)內(nei)部(bu)探(tan)傷(shang)。若(ruo)鋼(gang)管(guan)內(nei)部(bu)有(you)裂(lie)紋(wen)，氣(qi)泡(pao)等(deng)問(wen)題(ti)，將(qiang)被(bei)探(tan)測(ce)出(chu)。鋼(gang)管(guan)質(zhi)檢(jian)後(hou)還(huan)要(yao)通(tong)過(guo)嚴(yan)格(ge)的(di)手(shou)工(gong)挑(tiao)選(xuan)。鋼(gang)管(guan)質(zhi)檢(jian)後(hou)，用(yong)油(you)漆(qi)噴(pen)上(shang)編(bian)號(hao)、規(gui)格(ge)、生(sheng)產(chan)批(pi)號(hao)等(deng)。並(bing)由(you)吊(diao)車(ju)吊(diao)入(ru)倉(cang)庫(ku)中(zhong)。