無縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)由整塊金(jin)屬制成的(de)(de)(de)，表面上沒(mei)有(you)接縫(feng)的(de)(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，稱為(wei)無縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根(gen)據生(sheng)(sheng)產(chan)(chan)方(fang)法，無縫(feng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分熱(re)(re)軋(ya)(ya)(ya)(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷軋(ya)(ya)(ya)(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷拔管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)。按照斷面形狀，無縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分圓形和(he)異形兩(liang)種(zhong)，異形管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)有(you)方(fang)形、橢(tuo)圓形、三角(jiao)形、六角(jiao)形、瓜子形、星(xing)形、 帶翅管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)多(duo)種(zhong)復雜(za)形狀。更大直(zhi)(zhi)徑(jing)(jing)達650mm，*小直(zhi)(zhi)徑(jing)(jing)為(wei) 0.3mm。根(gen)據用(yong)途(tu)不(bu)同， 有(you)厚壁(bi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和(he)薄壁(bi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。無縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主(zhu)要(yao)用(yong)做石(shi)油地質(zhi)(zhi)鉆探(tan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石(shi)油化(hua)(hua)工(gong)用(yong)的(de)(de)(de)裂(lie)化(hua)(hua)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、鍋 爐(lu)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、軸(zhou)承管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)以及(ji)汽車、拖拉機、航空用(yong)高精(jing)度(du)結(jie)構(gou)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。沿其(qi)橫截面的(de)(de)(de)周(zhou)邊上無接縫(feng)的(de)(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根(gen)據生(sheng)(sheng)產(chan)(chan)方(fang)法不(bu)同分為(wei)熱(re)(re)軋(ya)(ya)(ya)(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷軋(ya)(ya)(ya)(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷拔管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)，均(jun)有(you)各(ge)自工(gong)藝規定(ding)。材(cai)質(zhi)(zhi)有(you)普通(tong)和(he)優質(zhi)(zhi)碳(tan)素結(jie)構(gou)鋼(gang)（Q215-A～Q275-A和(he)10～50號鋼(gang)）、低合金(jin)鋼(gang)（09MnV、16Mn等(deng)(deng)）、合金(jin)鋼(gang)、不(bu)銹耐(nai)酸鋼(gang)等(deng)(deng)。按用(yong)途(tu)分為(wei)一般用(yong)途(tu)的(de)(de)(de)（用(yong)于輸水、氣管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)和(he)結(jie)構(gou)件(jian)、機械零件(jian)）和(he)專用(yong)的(de)(de)(de)（用(yong)于鍋爐(lu)、地質(zhi)(zhi)勘探(tan)、軸(zhou)承、耐(nai)酸等(deng)(deng)）兩(liang)類。①熱(re)(re)軋(ya)(ya)(ya)(ya)無縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主(zhu)要(yao)生(sheng)(sheng)產(chan)(chan)工(gong)序(xu)（△主(zhu)要(yao)檢驗工(gong)序(xu)）：

管坯(pi)準備及檢查△→管坯(pi)加熱(re)→穿孔(kong)→軋管→鋼(gang)管再加熱(re)→定（減）徑→熱(re)處理△→成品管矯直→精整(zheng)→檢驗(yan)△（無損、理化、臺檢） →入庫
②冷軋（拔）無(wu)縫(feng)鋼管(guan)主要(yao)生產工(gong)序：無(wu)縫(feng)鋼管(guan)_無(wu)縫(feng)鋼管(guan)廠家(jia)_無(wu)縫(feng)鋼管(guan)價格
坯料準(zhun)備→酸洗潤滑→冷軋（拔）→熱處理→矯直(zhi)→精(jing)整→檢(jian)驗
一(yi)般的(de)(de)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)的(de)(de)生(sheng)產工(gong)藝可以分為冷(leng)拔與熱(re)(re)軋(ya)兩種，冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)的(de)(de)生(sheng)產流程(cheng)一(yi)般要(yao)(yao)(yao)(yao)比熱(re)(re)軋(ya)要(yao)(yao)(yao)(yao)復雜，管(guan)(guan)坯(pi)首先(xian)要(yao)(yao)(yao)(yao)進(jin)行(xing)(xing)三輥連軋(ya)，擠壓后(hou)要(yao)(yao)(yao)(yao)進(jin)行(xing)(xing)定徑測試，如果表面(mian)沒(mei)有(you)響應(ying)裂紋后(hou)圓管(guan)(guan)要(yao)(yao)(yao)(yao)經過割機進(jin)行(xing)(xing)切割，切割成長度(du)約一(yi)米(mi)的(de)(de)坯(pi)料。然后(hou)進(jin)入退火流程(cheng)，退火要(yao)(yao)(yao)(yao)用酸(suan)性液體進(jin)行(xing)(xing)酸(suan)洗(xi)，酸(suan)洗(xi)時要(yao)(yao)(yao)(yao)注(zhu)意表面(mian)是否有(you)大(da)量的(de)(de)起泡(pao)產生(sheng)，如果有(you)大(da)量的(de)(de)起泡(pao)產生(sheng)說明(ming)鋼(gang)(gang)(gang)管(guan)(guan)的(de)(de)質(zhi)量達不到相(xiang)應(ying)的(de)(de)標(biao)準。外觀上冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)要(yao)(yao)(yao)(yao)短于熱(re)(re)軋(ya)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)，冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)的(de)(de)壁厚一(yi)般比熱(re)(re)軋(ya)無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)要(yao)(yao)(yao)(yao)小，但是表面(mian)看起來比厚壁無縫(feng)(feng)鋼(gang)(gang)(gang)管(guan)(guan)更(geng)加明(ming)亮，表面(mian)沒(mei)有(you)太多的(de)(de)粗糙，口(kou)徑也沒(mei)有(you)太多的(de)(de)毛刺。
熱(re)(re)(re)軋(ya)無縫鋼管(guan)的(de)(de)(de)交貨狀(zhuang)態一般是熱(re)(re)(re)軋(ya)狀(zhuang)態經過(guo)熱(re)(re)(re)處(chu)理后進行交貨。熱(re)(re)(re)軋(ya)無縫鋼管(guan)在經過(guo)質檢(jian)后要(yao)(yao)經過(guo)工作人員的(de)(de)(de)嚴(yan)格(ge)的(de)(de)(de)手(shou)工挑選，在質檢(jian)后要(yao)(yao)進行表面涂油(you)，然后緊接著是多次的(de)(de)(de)冷拔(ba)實(shi)驗，熱(re)(re)(re)軋(ya)處(chu)理后要(yao)(yao)進行穿孔(kong)的(de)(de)(de)實(shi)驗，如果穿孔(kong)擴徑過(guo)大就要(yao)(yao)進行矯(jiao)直矯(jiao)正。在矯(jiao)直后再由(you)傳送裝置(zhi)傳送到探(tan)傷機進行探(tan)傷實(shi)驗，*后貼上標簽、進行規格(ge)編排(pai)后放置(zhi)到到倉(cang)庫當(dang)中。
圓管坯→加熱(re)→穿孔→三輥斜軋(ya)(ya)、連軋(ya)(ya)或擠(ji)壓→脫管→定徑(jing)（或減徑(jing)）→冷卻→矯直→水壓試驗（或探(tan)傷(shang)）→標記(ji)→入庫 無縫鋼管是用(yong)鋼錠或實心管坯經(jing)穿孔制成毛(mao)管，然(ran)后經(jing)熱(re)軋(ya)(ya)、冷軋(ya)(ya)或冷撥(bo)制成。無縫鋼管的規格用(yong)外(wai)徑(jing)*壁厚(hou)毫米數表示。
熱軋無(wu)縫(feng)管(guan)(guan)外徑(jing)一般大于32mm，壁(bi)(bi)厚2.5-200mm，冷(leng)(leng)軋無(wu)縫(feng)鋼管(guan)(guan)外徑(jing)可以(yi)到(dao)(dao)6mm，壁(bi)(bi)厚可到(dao)(dao)0.25mm，薄(bo)壁(bi)(bi)管(guan)(guan)外徑(jing)可到(dao)(dao)5mm壁(bi)(bi)厚小于0.25mm，冷(leng)(leng)軋比熱軋尺寸精度高(gao)。
一般(ban)用無縫(feng)鋼管(guan)是(shi)用10、20、30、35、45等優質碳(tan)結(jie)鋼16Mn、5MnV等低合(he)金(jin)結(jie)構(gou)鋼或40Cr、30CrMnSi、45Mn2、40MnB等合(he)結(jie)鋼熱(re)(re)軋(ya)(ya)或冷(leng)軋(ya)(ya)制(zhi)(zhi)成的。10、20等低碳(tan)鋼制(zhi)(zhi)造的無縫(feng)管(guan)主(zhu)要用于流體輸送管(guan)道。45、40Cr等中碳(tan)鋼制(zhi)(zhi)成的無縫(feng)管(guan)用來制(zhi)(zhi)造機(ji)(ji)械零件，如汽車(che)、拖拉機(ji)(ji)的受力(li)零件。一般(ban)用無縫(feng)鋼管(guan)要保(bao)證強度和壓(ya)扁試(shi)驗。熱(re)(re)軋(ya)(ya)鋼管(guan)以熱(re)(re)軋(ya)(ya)狀(zhuang)態或熱(re)(re)處理(li)狀(zhuang)態交貨；冷(leng)軋(ya)(ya)以熱(re)(re)處理(li)狀(zhuang)態交貨。

熱軋(ya)(ya)(ya)(ya)，顧名思(si)義，軋(ya)(ya)(ya)(ya)件的溫度(du)高，因此變形抗(kang)力小，可(ke)以(yi)實現(xian)(xian)大的變形量。以(yi)鋼板的軋(ya)(ya)(ya)(ya)制為(wei)例(li)，一般連鑄(zhu)坯厚度(du)在230mm左右，而(er)經過粗軋(ya)(ya)(ya)(ya)和精軋(ya)(ya)(ya)(ya)，*終(zhong)厚度(du)為(wei)1~20mm。同(tong)時，由于鋼板的寬厚比小，尺寸精度(du)要(yao)(yao)求相對低(di)，不容易出(chu)現(xian)(xian)板形問題，以(yi)控(kong)制凸(tu)度(du)為(wei)主。對于組(zu)織有(you)要(yao)(yao)求的，一般通過控(kong)軋(ya)(ya)(ya)(ya)控(kong)冷(leng)來實現(xian)(xian)，即控(kong)制精軋(ya)(ya)(ya)(ya)的開軋(ya)(ya)(ya)(ya)溫度(du)、終(zhong)軋(ya)(ya)(ya)(ya)溫度(du).圓管(guan)坯→加熱→穿孔→打頭→退火→酸洗(xi)→涂油（鍍銅(tong)）→多道次冷(leng)拔（冷(leng)軋(ya)(ya)(ya)(ya)）→坯管(guan)→熱處理→矯(jiao)直→水壓試(shi)驗（探傷）→標記(ji)→入庫。