無(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)由整塊金(jin)(jin)屬制成的，表面上沒有(you)接縫(feng)的鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)，稱為(wei)無(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。根據(ju)生產方(fang)法，無(wu)(wu)縫(feng)管(guan)(guan)(guan)(guan)(guan)分(fen)熱軋(ya)管(guan)(guan)(guan)(guan)(guan)、冷(leng)軋(ya)管(guan)(guan)(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)等(deng)。按照斷面形(xing)(xing)(xing)狀，無(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)分(fen)圓形(xing)(xing)(xing)和異形(xing)(xing)(xing)兩種(zhong)(zhong)，異形(xing)(xing)(xing)管(guan)(guan)(guan)(guan)(guan)有(you)方(fang)形(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)、三(san)角形(xing)(xing)(xing)、六角形(xing)(xing)(xing)、瓜子形(xing)(xing)(xing)、星形(xing)(xing)(xing)、 帶(dai)翅管(guan)(guan)(guan)(guan)(guan)多種(zhong)(zhong)復雜形(xing)(xing)(xing)狀。更大直徑達650mm，*小直徑為(wei) 0.3mm。根據(ju)用(yong)(yong)途不(bu)同， 有(you)厚壁管(guan)(guan)(guan)(guan)(guan)和薄壁管(guan)(guan)(guan)(guan)(guan)。無(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)主要用(yong)(yong)做石油(you)地質(zhi)鉆探管(guan)(guan)(guan)(guan)(guan)、石油(you)化工(gong)用(yong)(yong)的裂化管(guan)(guan)(guan)(guan)(guan)、鍋 爐管(guan)(guan)(guan)(guan)(guan)、軸(zhou)承(cheng)管(guan)(guan)(guan)(guan)(guan)以及汽車(che)、拖拉機(ji)、航空用(yong)(yong)高精度結構鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。沿其橫截面的周邊(bian)上無(wu)(wu)接縫(feng)的鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。根據(ju)生產方(fang)法不(bu)同分(fen)為(wei)熱軋(ya)管(guan)(guan)(guan)(guan)(guan)、冷(leng)軋(ya)管(guan)(guan)(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)等(deng)，均有(you)各自工(gong)藝規定。材(cai)質(zhi)有(you)普(pu)通和優質(zhi)碳素結構鋼(gang)(gang)(gang)(gang)(gang)（Q215-A～Q275-A和10～50號鋼(gang)(gang)(gang)(gang)(gang)）、低合金(jin)(jin)鋼(gang)(gang)(gang)(gang)(gang)（09MnV、16Mn等(deng)）、合金(jin)(jin)鋼(gang)(gang)(gang)(gang)(gang)、不(bu)銹耐(nai)酸(suan)(suan)鋼(gang)(gang)(gang)(gang)(gang)等(deng)。按用(yong)(yong)途分(fen)為(wei)一般用(yong)(yong)途的（用(yong)(yong)于輸水、氣管(guan)(guan)(guan)(guan)(guan)道和結構件(jian)、機(ji)械零件(jian)）和專用(yong)(yong)的（用(yong)(yong)于鍋爐、地質(zhi)勘探、軸(zhou)承(cheng)、耐(nai)酸(suan)(suan)等(deng)）兩類。①熱軋(ya)無(wu)(wu)縫(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)主要生產工(gong)序（△主要檢驗工(gong)序）：

管(guan)(guan)坯準(zhun)備及檢查△→管(guan)(guan)坯加熱→穿孔→軋管(guan)(guan)→鋼管(guan)(guan)再加熱→定（減）徑(jing)→熱處理△→成品(pin)管(guan)(guan)矯(jiao)直→精整→檢驗△（無損、理化、臺檢） →入庫
②冷軋（拔）無縫鋼(gang)管(guan)主(zhu)要生產(chan)工序：無縫鋼(gang)管(guan)_無縫鋼(gang)管(guan)廠家(jia)_無縫鋼(gang)管(guan)價格
坯料(liao)準(zhun)備→酸(suan)洗潤滑→冷(leng)軋（拔）→熱處理→矯(jiao)直→精整→檢驗
一(yi)般的(de)(de)(de)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)的(de)(de)(de)生(sheng)(sheng)產(chan)(chan)工藝可以分為冷拔與(yu)熱軋(ya)兩種(zhong)，冷軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)的(de)(de)(de)生(sheng)(sheng)產(chan)(chan)流程一(yi)般要(yao)(yao)比(bi)熱軋(ya)要(yao)(yao)復(fu)雜，管(guan)(guan)(guan)(guan)坯首(shou)先(xian)要(yao)(yao)進(jin)行(xing)三輥連軋(ya)，擠壓后要(yao)(yao)進(jin)行(xing)定徑測(ce)試，如(ru)果表(biao)面(mian)沒有(you)響應(ying)裂紋后圓管(guan)(guan)(guan)(guan)要(yao)(yao)經過(guo)割機進(jin)行(xing)切(qie)割，切(qie)割成長度約一(yi)米(mi)的(de)(de)(de)坯料。然后進(jin)入退火流程，退火要(yao)(yao)用酸性液體(ti)進(jin)行(xing)酸洗(xi)，酸洗(xi)時(shi)要(yao)(yao)注意(yi)表(biao)面(mian)是否有(you)大量(liang)(liang)的(de)(de)(de)起泡(pao)產(chan)(chan)生(sheng)(sheng)，如(ru)果有(you)大量(liang)(liang)的(de)(de)(de)起泡(pao)產(chan)(chan)生(sheng)(sheng)說明鋼(gang)(gang)管(guan)(guan)(guan)(guan)的(de)(de)(de)質(zhi)量(liang)(liang)達不到相應(ying)的(de)(de)(de)標準。外觀上冷軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)要(yao)(yao)短(duan)于熱軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)，冷軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)的(de)(de)(de)壁厚(hou)一(yi)般比(bi)熱軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)要(yao)(yao)小，但是表(biao)面(mian)看(kan)起來(lai)比(bi)厚(hou)壁無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)更(geng)加明亮，表(biao)面(mian)沒有(you)太(tai)多的(de)(de)(de)粗糙，口徑也(ye)沒有(you)太(tai)多的(de)(de)(de)毛刺。
熱軋(ya)(ya)(ya)無(wu)縫鋼管的(de)(de)交貨(huo)狀態一般是熱軋(ya)(ya)(ya)狀態經過(guo)熱處(chu)理后(hou)進行(xing)(xing)交貨(huo)。熱軋(ya)(ya)(ya)無(wu)縫鋼管在(zai)(zai)經過(guo)質檢(jian)后(hou)要經過(guo)工作人員的(de)(de)嚴(yan)格(ge)的(de)(de)手工挑(tiao)選，在(zai)(zai)質檢(jian)后(hou)要進行(xing)(xing)表(biao)面(mian)涂油，然(ran)后(hou)緊接著(zhu)是多(duo)次的(de)(de)冷拔實驗(yan)(yan)，熱軋(ya)(ya)(ya)處(chu)理后(hou)要進行(xing)(xing)穿(chuan)孔的(de)(de)實驗(yan)(yan)，如果(guo)穿(chuan)孔擴(kuo)徑(jing)過(guo)大就(jiu)要進行(xing)(xing)矯直(zhi)矯正。在(zai)(zai)矯直(zhi)后(hou)再(zai)由傳送裝置(zhi)傳送到(dao)探傷機進行(xing)(xing)探傷實驗(yan)(yan)，*后(hou)貼(tie)上(shang)標簽、進行(xing)(xing)規格(ge)編排后(hou)放置(zhi)到(dao)到(dao)倉(cang)庫當中(zhong)。
圓(yuan)管(guan)(guan)(guan)坯→加熱→穿孔(kong)(kong)→三輥斜軋(ya)、連軋(ya)或擠壓(ya)→脫管(guan)(guan)(guan)→定徑(jing)（或減徑(jing)）→冷(leng)卻→矯直→水壓(ya)試驗（或探傷）→標記→入庫 無(wu)縫(feng)鋼管(guan)(guan)(guan)是用(yong)鋼錠或實心(xin)管(guan)(guan)(guan)坯經穿孔(kong)(kong)制(zhi)成毛管(guan)(guan)(guan)，然后經熱軋(ya)、冷(leng)軋(ya)或冷(leng)撥制(zhi)成。無(wu)縫(feng)鋼管(guan)(guan)(guan)的規(gui)格用(yong)外徑(jing)*壁(bi)厚毫米(mi)數表(biao)示。
熱軋(ya)無縫管外徑(jing)一(yi)般(ban)大于(yu)(yu)32mm，壁厚2.5-200mm，冷軋(ya)無縫鋼管外徑(jing)可(ke)(ke)(ke)以到(dao)6mm，壁厚可(ke)(ke)(ke)到(dao)0.25mm，薄壁管外徑(jing)可(ke)(ke)(ke)到(dao)5mm壁厚小于(yu)(yu)0.25mm，冷軋(ya)比熱軋(ya)尺(chi)寸精(jing)度高(gao)。
一般(ban)用(yong)無(wu)縫鋼(gang)管(guan)是用(yong)10、20、30、35、45等(deng)優(you)質碳結鋼(gang)16Mn、5MnV等(deng)低合金結構(gou)鋼(gang)或(huo)(huo)40Cr、30CrMnSi、45Mn2、40MnB等(deng)合結鋼(gang)熱(re)(re)軋(ya)(ya)(ya)或(huo)(huo)冷(leng)軋(ya)(ya)(ya)制成的(de)。10、20等(deng)低碳鋼(gang)制造的(de)無(wu)縫管(guan)主(zhu)要用(yong)于流體輸送管(guan)道(dao)。45、40Cr等(deng)中(zhong)碳鋼(gang)制成的(de)無(wu)縫管(guan)用(yong)來制造機(ji)械零件(jian)，如(ru)汽車(che)、拖拉機(ji)的(de)受力零件(jian)。一般(ban)用(yong)無(wu)縫鋼(gang)管(guan)要保證強度(du)和壓扁(bian)試驗。熱(re)(re)軋(ya)(ya)(ya)鋼(gang)管(guan)以熱(re)(re)軋(ya)(ya)(ya)狀態或(huo)(huo)熱(re)(re)處理(li)狀態交(jiao)貨(huo)；冷(leng)軋(ya)(ya)(ya)以熱(re)(re)處理(li)狀態交(jiao)貨(huo)。

熱軋，顧名思義，軋件的(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)高(gao)，因此(ci)變(bian)形(xing)抗(kang)力小(xiao)，可以實現大的(de)(de)(de)變(bian)形(xing)量。以鋼板(ban)的(de)(de)(de)軋制為例，一般連鑄坯(pi)厚(hou)度(du)(du)在(zai)230mm左右(you)，而(er)經過(guo)粗軋和精(jing)(jing)軋，*終厚(hou)度(du)(du)為1~20mm。同時，由(you)于(yu)鋼板(ban)的(de)(de)(de)寬(kuan)厚(hou)比小(xiao)，尺寸精(jing)(jing)度(du)(du)要求(qiu)相對(dui)低，不容易出現板(ban)形(xing)問題，以控(kong)制凸度(du)(du)為主(zhu)。對(dui)于(yu)組織(zhi)有要求(qiu)的(de)(de)(de)，一般通過(guo)控(kong)軋控(kong)冷來實現，即控(kong)制精(jing)(jing)軋的(de)(de)(de)開軋溫(wen)(wen)(wen)度(du)(du)、終軋溫(wen)(wen)(wen)度(du)(du).圓管(guan)(guan)坯(pi)→加熱→穿孔→打頭→退火→酸洗(xi)→涂油（鍍銅）→多道次冷拔（冷軋）→坯(pi)管(guan)(guan)→熱處理→矯直→水(shui)壓試驗（探傷）→標記→入庫。