低中壓鍋爐管用鋼錠或實心管坯經穿孔制成毛管，然后經熱軋、冷軋或冷撥制成。無縫鋼管在我國鋼管業中具有重要的地位。據不完全統計，我國現有無縫管 生產企業約240多家，無縫鋼管機組約250多套，年產能力約450多萬噸。從口徑看，＜φ76的，占35%，＜φ159-650的，占25%。從品種 看，一般用途管190萬噸，占54%；石油管76萬噸，占5.7%；液壓支柱、精密管15萬噸，占4.3%；不銹管、軸承管、汽車管共5萬噸，占 1.4%。
  軋制無縫管(guan)(guan)(guan)的(de)(de)(de)(de)(de)原料是圓(yuan)管(guan)(guan)(guan)坯(pi)(pi)，圓(yuan)管(guan)(guan)(guan)胚要(yao)經(jing)過(guo)(guo)(guo)切(qie)割機(ji)(ji)的(de)(de)(de)(de)(de)切(qie)割加工成長(chang)度約(yue)為1米的(de)(de)(de)(de)(de)坯(pi)(pi)料，并經(jing)傳送(song)(song)帶送(song)(song)到熔爐(lu)(lu)內(nei)(nei)加熱(re)。鋼(gang)(gang)(gang)坯(pi)(pi)被(bei)送(song)(song)入熔爐(lu)(lu)內(nei)(nei)加 熱(re)，溫度大(da)約(yue)為1200℃。燃料為氫氣或乙炔。爐(lu)(lu)內(nei)(nei)溫度控(kong)制是關鍵性的(de)(de)(de)(de)(de)問(wen)題(ti).圓(yuan)管(guan)(guan)(guan)坯(pi)(pi)出爐(lu)(lu)后(hou)要(yao)經(jing)過(guo)(guo)(guo)壓(ya)(ya)力穿(chuan)孔(kong)(kong)(kong)機(ji)(ji)進(jin)行穿(chuan)空。一般較(jiao)常見(jian)的(de)(de)(de)(de)(de)穿(chuan)孔(kong)(kong)(kong)機(ji)(ji)是錐形輥穿(chuan)孔(kong)(kong)(kong)機(ji)(ji)， 這種(zhong)穿(chuan)孔(kong)(kong)(kong)機(ji)(ji)生(sheng)產(chan)效(xiao)率高(gao)，產(chan)品質量好，穿(chuan)孔(kong)(kong)(kong)擴(kuo)徑(jing)(jing)(jing)量大(da)，可穿(chuan)多種(zhong)鋼(gang)(gang)(gang)種(zhong)。穿(chuan)孔(kong)(kong)(kong)后(hou)，圓(yuan)管(guan)(guan)(guan)坯(pi)(pi)就先(xian)后(hou)被(bei)三輥斜(xie)軋、連軋或擠壓(ya)(ya)。擠壓(ya)(ya)后(hou)要(yao)脫管(guan)(guan)(guan)定(ding)徑(jing)(jing)(jing)。定(ding)徑(jing)(jing)(jing)機(ji)(ji)通(tong)過(guo)(guo)(guo)錐形鉆(zhan)頭高(gao) 速旋(xuan)轉入鋼(gang)(gang)(gang)胚打孔(kong)(kong)(kong)，形成鋼(gang)(gang)(gang)管(guan)(guan)(guan)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)內(nei)(nei)徑(jing)(jing)(jing)由(you)定(ding)徑(jing)(jing)(jing)機(ji)(ji)鉆(zhan)頭的(de)(de)(de)(de)(de)外徑(jing)(jing)(jing)長(chang)度來確定(ding)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)定(ding)徑(jing)(jing)(jing)后(hou)，進(jin)入冷(leng)(leng)卻(que)塔中，通(tong)過(guo)(guo)(guo)噴水(shui)冷(leng)(leng)卻(que)，鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)冷(leng)(leng)卻(que)后(hou)，就要(yao)被(bei)矯直(zhi)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)經(jing)矯直(zhi) 后(hou)由(you)傳送(song)(song)帶送(song)(song)至金(jin)屬(shu)探(tan)傷(shang)機(ji)(ji)（或水(shui)壓(ya)(ya)實驗）進(jin)行內(nei)(nei)部探(tan)傷(shang)。若鋼(gang)(gang)(gang)管(guan)(guan)(guan)內(nei)(nei)部有裂紋，氣泡(pao)等問(wen)題(ti)，將被(bei)探(tan)測出。鋼(gang)(gang)(gang)管(guan)(guan)(guan)質檢后(hou)還要(yao)通(tong)過(guo)(guo)(guo)嚴格的(de)(de)(de)(de)(de)手(shou)工挑(tiao)選。鋼(gang)(gang)(gang)管(guan)(guan)(guan)質檢后(hou)，用油 漆噴上編號、規格、生(sheng)產(chan)批號等。并由(you)吊(diao)車吊(diao)入倉(cang)庫中。