無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)由(you)整塊金屬制(zhi)成的，表面上(shang)(shang)沒有(you)接(jie)縫(feng)(feng)(feng)的鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，稱(cheng)為無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根據(ju)生(sheng)產方法(fa)，無縫(feng)(feng)(feng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)熱(re)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)拔(ba)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)。按(an)照(zhao)斷(duan)面形狀，無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)圓形和(he)(he)異形兩(liang)種，異形管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)有(you)方形、橢(tuo)圓形、三角(jiao)形、六(liu)角(jiao)形、瓜子形、星形、 帶翅管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)多種復雜形狀。更大直徑達650mm，*小直徑為 0.3mm。根據(ju)用(yong)(yong)途不(bu)同(tong)， 有(you)厚壁管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)薄壁管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主要用(yong)(yong)做石油(you)地(di)(di)質(zhi)鉆探(tan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石油(you)化工(gong)(gong)用(yong)(yong)的裂化管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、鍋(guo) 爐管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、軸(zhou)承(cheng)(cheng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)以及汽車、拖拉機、航空用(yong)(yong)高精(jing)度結(jie)構鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。沿其橫截面的周邊上(shang)(shang)無接(jie)縫(feng)(feng)(feng)的鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根據(ju)生(sheng)產方法(fa)不(bu)同(tong)分(fen)為熱(re)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)拔(ba)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)，均有(you)各(ge)自工(gong)(gong)藝(yi)規(gui)定(ding)。材質(zhi)有(you)普通和(he)(he)優質(zhi)碳素結(jie)構鋼(gang)(gang)（Q215-A～Q275-A和(he)(he)10～50號鋼(gang)(gang)）、低(di)合金鋼(gang)(gang)（09MnV、16Mn等(deng)(deng)）、合金鋼(gang)(gang)、不(bu)銹耐酸鋼(gang)(gang)等(deng)(deng)。按(an)用(yong)(yong)途分(fen)為一般用(yong)(yong)途的（用(yong)(yong)于輸水、氣管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道和(he)(he)結(jie)構件、機械零件）和(he)(he)專用(yong)(yong)的（用(yong)(yong)于鍋(guo)爐、地(di)(di)質(zhi)勘探(tan)、軸(zhou)承(cheng)(cheng)、耐酸等(deng)(deng)）兩(liang)類。①熱(re)軋無縫(feng)(feng)(feng)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主要生(sheng)產工(gong)(gong)序(xu)（△主要檢驗工(gong)(gong)序(xu)）：

管坯準(zhun)備及檢(jian)查(cha)△→管坯加(jia)熱(re)→穿(chuan)孔→軋(ya)管→鋼管再加(jia)熱(re)→定（減）徑(jing)→熱(re)處理(li)△→成品管矯直→精整(zheng)→檢(jian)驗△（無(wu)損、理(li)化、臺檢(jian)） →入(ru)庫
②冷軋(ya)（拔）無縫(feng)(feng)鋼(gang)(gang)管(guan)主(zhu)要生(sheng)產(chan)工序：無縫(feng)(feng)鋼(gang)(gang)管(guan)_無縫(feng)(feng)鋼(gang)(gang)管(guan)廠家_無縫(feng)(feng)鋼(gang)(gang)管(guan)價格
坯料準(zhun)備→酸洗潤滑→冷軋（拔）→熱處(chu)理→矯直(zhi)→精(jing)整→檢(jian)驗(yan)
一(yi)般(ban)的(de)(de)(de)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)的(de)(de)(de)生產工藝可以(yi)分為冷(leng)拔與(yu)熱(re)(re)軋(ya)兩種，冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)的(de)(de)(de)生產流(liu)程一(yi)般(ban)要(yao)(yao)比熱(re)(re)軋(ya)要(yao)(yao)復(fu)雜，管(guan)(guan)坯首先要(yao)(yao)進行(xing)三輥連軋(ya)，擠壓后(hou)要(yao)(yao)進行(xing)定徑測(ce)試，如果表(biao)面(mian)沒有(you)響應(ying)裂紋后(hou)圓管(guan)(guan)要(yao)(yao)經過割機進行(xing)切(qie)割，切(qie)割成長度約一(yi)米(mi)的(de)(de)(de)坯料。然后(hou)進入退(tui)火流(liu)程，退(tui)火要(yao)(yao)用酸性液(ye)體進行(xing)酸洗(xi)(xi)，酸洗(xi)(xi)時要(yao)(yao)注意表(biao)面(mian)是否有(you)大(da)量的(de)(de)(de)起(qi)泡產生，如果有(you)大(da)量的(de)(de)(de)起(qi)泡產生說明鋼(gang)(gang)管(guan)(guan)的(de)(de)(de)質(zhi)量達不到相(xiang)應(ying)的(de)(de)(de)標準(zhun)。外觀上冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)要(yao)(yao)短(duan)于熱(re)(re)軋(ya)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)，冷(leng)軋(ya)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)的(de)(de)(de)壁厚(hou)一(yi)般(ban)比熱(re)(re)軋(ya)無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)要(yao)(yao)小，但是表(biao)面(mian)看起(qi)來比厚(hou)壁無縫(feng)(feng)鋼(gang)(gang)管(guan)(guan)更(geng)加明亮，表(biao)面(mian)沒有(you)太多的(de)(de)(de)粗糙，口徑也沒有(you)太多的(de)(de)(de)毛(mao)刺(ci)。
熱(re)軋(ya)(ya)(ya)無縫(feng)鋼管(guan)的(de)交(jiao)貨(huo)狀態一般是熱(re)軋(ya)(ya)(ya)狀態經(jing)過(guo)熱(re)處理(li)后(hou)(hou)進(jin)行(xing)(xing)(xing)交(jiao)貨(huo)。熱(re)軋(ya)(ya)(ya)無縫(feng)鋼管(guan)在經(jing)過(guo)質檢后(hou)(hou)要經(jing)過(guo)工作人員的(de)嚴格(ge)的(de)手工挑選，在質檢后(hou)(hou)要進(jin)行(xing)(xing)(xing)表面(mian)涂油，然后(hou)(hou)緊接著是多(duo)次的(de)冷拔實驗，熱(re)軋(ya)(ya)(ya)處理(li)后(hou)(hou)要進(jin)行(xing)(xing)(xing)穿孔(kong)的(de)實驗，如果(guo)穿孔(kong)擴徑過(guo)大就要進(jin)行(xing)(xing)(xing)矯直(zhi)矯正。在矯直(zhi)后(hou)(hou)再由傳送(song)裝置傳送(song)到探傷機進(jin)行(xing)(xing)(xing)探傷實驗，*后(hou)(hou)貼(tie)上標簽、進(jin)行(xing)(xing)(xing)規(gui)格(ge)編排(pai)后(hou)(hou)放(fang)置到到倉庫當中。
圓管坯(pi)→加熱(re)→穿(chuan)孔→三輥斜(xie)軋、連軋或(huo)擠壓→脫管→定(ding)徑（或(huo)減(jian)徑）→冷(leng)卻→矯(jiao)直→水壓試(shi)驗（或(huo)探傷）→標(biao)記→入庫 無縫鋼管是用鋼錠或(huo)實心管坯(pi)經穿(chuan)孔制成(cheng)毛管，然后(hou)經熱(re)軋、冷(leng)軋或(huo)冷(leng)撥制成(cheng)。無縫鋼管的規格(ge)用外徑*壁厚毫(hao)米數表示。
熱軋(ya)(ya)無縫管外徑一般大(da)于32mm，壁(bi)(bi)厚(hou)2.5-200mm，冷軋(ya)(ya)無縫鋼管外徑可以到6mm，壁(bi)(bi)厚(hou)可到0.25mm，薄(bo)壁(bi)(bi)管外徑可到5mm壁(bi)(bi)厚(hou)小于0.25mm，冷軋(ya)(ya)比熱軋(ya)(ya)尺寸精度高。
一般(ban)用無(wu)縫(feng)鋼(gang)管(guan)(guan)是(shi)用10、20、30、35、45等(deng)(deng)優質碳(tan)結(jie)鋼(gang)16Mn、5MnV等(deng)(deng)低合金結(jie)構鋼(gang)或(huo)40Cr、30CrMnSi、45Mn2、40MnB等(deng)(deng)合結(jie)鋼(gang)熱(re)軋(ya)或(huo)冷(leng)軋(ya)制(zhi)成(cheng)(cheng)的(de)。10、20等(deng)(deng)低碳(tan)鋼(gang)制(zhi)造的(de)無(wu)縫(feng)管(guan)(guan)主要用于流體輸送管(guan)(guan)道(dao)。45、40Cr等(deng)(deng)中碳(tan)鋼(gang)制(zhi)成(cheng)(cheng)的(de)無(wu)縫(feng)管(guan)(guan)用來制(zhi)造機械零件，如汽車(che)、拖拉機的(de)受力零件。一般(ban)用無(wu)縫(feng)鋼(gang)管(guan)(guan)要保證強度和(he)壓扁(bian)試驗。熱(re)軋(ya)鋼(gang)管(guan)(guan)以熱(re)軋(ya)狀(zhuang)態(tai)或(huo)熱(re)處(chu)理(li)狀(zhuang)態(tai)交(jiao)貨；冷(leng)軋(ya)以熱(re)處(chu)理(li)狀(zhuang)態(tai)交(jiao)貨。

熱軋(ya)，顧名思義，軋(ya)件的溫(wen)度高，因此變形抗力小(xiao)，可以實現大的變形量。以鋼板的軋(ya)制為例，一般連鑄坯(pi)厚(hou)度在230mm左右，而經(jing)過(guo)粗軋(ya)和精軋(ya)，*終厚(hou)度為1~20mm。同(tong)時，由于鋼板的寬(kuan)厚(hou)比(bi)小(xiao)，尺寸精度要(yao)求相對低，不容易出現板形問題，以控制凸度為主(zhu)。對于組(zu)織(zhi)有要(yao)求的，一般通過(guo)控軋(ya)控冷(leng)來實現，即控制精軋(ya)的開(kai)軋(ya)溫(wen)度、終軋(ya)溫(wen)度.圓(yuan)管坯(pi)→加熱→穿孔→打頭→退火→酸(suan)洗→涂油（鍍銅）→多道次冷(leng)拔（冷(leng)軋(ya)）→坯(pi)管→熱處理→矯直→水壓試驗（探傷）→標記→入庫。