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大(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)是(shi)用鋼(gang)(gang)(gang)(gang)錠或實(shi)(shi)心管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)坯經(jing)穿(chuan)(chuan)孔(kong)(kong)制成毛管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，然后(hou)經(jing)熱(re)軋(ya)制成。大(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)在(zai)我國鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)業(ye)中(zhong)具有(you)重要(yao)的(de)(de)(de)地位(wei)。據不完(wan)全統計，我國現(xian)有(you)無(wu)縫(feng)(feng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)生(sheng)產(chan)企業(ye)約240多(duo)家(jia)，大(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)機(ji)(ji)組(zu)約250多(duo)套，大(da)口(kou)徑(jing)(jing)(jing)的(de)(de)(de)厚(hou)壁(bi)無(wu)縫(feng)(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主要(yao)是(shi)以(yi)它(ta)的(de)(de)(de)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)外(wai)部(bu)口(kou)徑(jing)(jing)(jing)來說的(de)(de)(de)，一般外(wai)徑(jing)(jing)(jing)在(zai)325毫(hao)米(mi)(mi)以(yi)上的(de)(de)(de)我們(men)都稱為(wei)大(da)口(kou)徑(jing)(jing)(jing)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，厚(hou)壁(bi)呢，一般壁(bi)厚(hou)在(zai)20毫(hao)米(mi)(mi)以(yi)上的(de)(de)(de)就(jiu)可(ke)以(yi)了(le)， 以(yi)下是(shi)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)制造過(guo)(guo)程：鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)原料是(shi)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)坯料，管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)坯要(yao)經(jing)過(guo)(guo)切割機(ji)(ji)的(de)(de)(de)切割加工成長度(du)約為(wei)1米(mi)(mi)的(de)(de)(de)坯料，并經(jing)傳(chuan)送帶(dai)送到(dao)熔(rong)爐(lu)(lu)內(nei)(nei)(nei)加熱(re)。鋼(gang)(gang)(gang)(gang)坯被送入(ru)(ru)(ru)熔(rong)爐(lu)(lu)內(nei)(nei)(nei)加熱(re)，溫(wen)度(du)大(da)約為(wei)1200℃。燃料為(wei)氫氣(qi)或乙炔。爐(lu)(lu)內(nei)(nei)(nei)溫(wen)度(du)控制是(shi)關鍵(jian)性的(de)(de)(de)問題(ti)·圓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)坯出(chu)爐(lu)(lu)后(hou)要(yao)經(jing)過(guo)(guo)壓(ya)力穿(chuan)(chuan)孔(kong)(kong)機(ji)(ji)進(jin)行(xing)穿(chuan)(chuan)空。一般較常見的(de)(de)(de)穿(chuan)(chuan)孔(kong)(kong)機(ji)(ji)是(shi)錐形輥穿(chuan)(chuan)孔(kong)(kong)機(ji)(ji)，這種(zhong)穿(chuan)(chuan)孔(kong)(kong)機(ji)(ji)生(sheng)產(chan)效率高，產(chan)品質量好(hao)，穿(chuan)(chuan)孔(kong)(kong)擴(kuo)徑(jing)(jing)(jing)量大(da)，可(ke)穿(chuan)(chuan)多(duo)種(zhong)鋼(gang)(gang)(gang)(gang)種(zhong)。穿(chuan)(chuan)孔(kong)(kong)后(hou)，圓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)坯就(jiu)先后(hou)被三輥斜軋(ya)、連(lian)軋(ya)或擠壓(ya)。擠壓(ya)后(hou)要(yao)脫(tuo)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)定(ding)徑(jing)(jing)(jing)。定(ding)徑(jing)(jing)(jing)機(ji)(ji)通過(guo)(guo)錐形鉆(zhan)頭(tou)高速旋轉入(ru)(ru)(ru)鋼(gang)(gang)(gang)(gang)胚打(da)孔(kong)(kong)，形成鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)內(nei)(nei)(nei)徑(jing)(jing)(jing)由定(ding)徑(jing)(jing)(jing)機(ji)(ji)鉆(zhan)頭(tou)的(de)(de)(de)外(wai)徑(jing)(jing)(jing)長度(du)來確定(ding)。鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)經(jing)定(ding)徑(jing)(jing)(jing)后(hou)，進(jin)入(ru)(ru)(ru)冷(leng)卻(que)塔(ta)中(zhong)，通過(guo)(guo)噴水(shui)冷(leng)卻(que)，鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)經(jing)冷(leng)卻(que)后(hou)，就(jiu)要(yao)被矯(jiao)直(zhi)（其實(shi)(shi)現(xian)在(zai)很多(duo)的(de)(de)(de)廠家(jia)已經(jing)不用再矯(jiao)直(zhi)機(ji)(ji)矯(jiao)直(zhi)了(le)，而是(shi)在(zai)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)通過(guo)(guo)軋(ya)機(ji)(ji)就(jiu)直(zhi)接達到(dao)了(le)它(ta)的(de)(de)(de)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)本(ben)身的(de)(de)(de)直(zhi)度(du)了(le)）。鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)經(jing)矯(jiao)直(zhi)后(hou)由傳(chuan)送帶(dai)送至金屬(shu)探傷機(ji)(ji)（或水(shui)壓(ya)實(shi)(shi)驗(yan)）進(jin)行(xing)內(nei)(nei)(nei)部(bu)探傷。若鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)內(nei)(nei)(nei)部(bu)有(you)裂紋，氣(qi)泡(pao)等(deng)問題(ti)，將被探測出(chu)。鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)質檢后(hou)還(huan)要(yao)通過(guo)(guo)嚴格的(de)(de)(de)手工挑(tiao)選(xuan)（現(xian)在(zai)都有(you)激光(guang)探測檢驗(yan)）。