無縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)由整塊金屬制成的(de)(de)(de)，表(biao)面(mian)(mian)上沒有(you)(you)接縫(feng)(feng)的(de)(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，稱為(wei)(wei)無縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根據(ju)生產方法，無縫(feng)(feng)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)熱軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠(ji)壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)。按(an)照斷(duan)面(mian)(mian)形(xing)狀，無縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)分(fen)圓形(xing)和異形(xing)兩種，異形(xing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)有(you)(you)方形(xing)、橢圓形(xing)、三角形(xing)、六角形(xing)、瓜(gua)子形(xing)、星形(xing)、 帶翅(chi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)多種復雜形(xing)狀。更大直徑(jing)達650mm，*小直徑(jing)為(wei)(wei) 0.3mm。根據(ju)用(yong)(yong)途不(bu)同， 有(you)(you)厚壁(bi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和薄壁(bi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。無縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主(zhu)(zhu)要(yao)用(yong)(yong)做石(shi)油地(di)質(zhi)鉆探管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、石(shi)油化工用(yong)(yong)的(de)(de)(de)裂(lie)化管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、鍋(guo)(guo) 爐管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、軸承管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)以及汽車(che)、拖拉機(ji)、航空用(yong)(yong)高(gao)精度(du)結(jie)構(gou)(gou)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。沿其橫(heng)截面(mian)(mian)的(de)(de)(de)周邊上無接縫(feng)(feng)的(de)(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根據(ju)生產方法不(bu)同分(fen)為(wei)(wei)熱軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)軋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、擠(ji)壓管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)、頂管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)等(deng)，均有(you)(you)各自工藝規定(ding)。材質(zhi)有(you)(you)普通和優質(zhi)碳(tan)素(su)結(jie)構(gou)(gou)鋼(gang)（Q215-A～Q275-A和10～50號(hao)鋼(gang)）、低(di)合金鋼(gang)（09MnV、16Mn等(deng)）、合金鋼(gang)、不(bu)銹耐(nai)酸(suan)鋼(gang)等(deng)。按(an)用(yong)(yong)途分(fen)為(wei)(wei)一(yi)般用(yong)(yong)途的(de)(de)(de)（用(yong)(yong)于輸水、氣管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道和結(jie)構(gou)(gou)件(jian)、機(ji)械(xie)零件(jian)）和專(zhuan)用(yong)(yong)的(de)(de)(de)（用(yong)(yong)于鍋(guo)(guo)爐、地(di)質(zhi)勘探、軸承、耐(nai)酸(suan)等(deng)）兩類。①熱軋無縫(feng)(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)主(zhu)(zhu)要(yao)生產工序(xu)（△主(zhu)(zhu)要(yao)檢驗(yan)工序(xu)）：

管(guan)(guan)坯準備及檢查△→管(guan)(guan)坯加熱→穿(chuan)孔→軋管(guan)(guan)→鋼(gang)管(guan)(guan)再加熱→定（減(jian)）徑(jing)→熱處理(li)△→成(cheng)品管(guan)(guan)矯直→精(jing)整→檢驗△（無(wu)損、理(li)化、臺檢） →入庫
②冷軋（拔）無縫鋼(gang)管主(zhu)要生產工序：無縫鋼(gang)管_無縫鋼(gang)管廠家_無縫鋼(gang)管價格
坯料準備→酸(suan)洗潤滑→冷軋（拔）→熱處理→矯直→精整→檢驗
一般(ban)的(de)(de)(de)(de)(de)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)生(sheng)產工藝可以分為冷拔與熱(re)軋(ya)兩種，冷軋(ya)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)生(sheng)產流(liu)程(cheng)一般(ban)要(yao)(yao)(yao)(yao)比熱(re)軋(ya)要(yao)(yao)(yao)(yao)復雜，管(guan)(guan)(guan)坯首先要(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(ce)試，如(ru)果表面(mian)沒(mei)有(you)(you)響(xiang)應裂紋后(hou)圓管(guan)(guan)(guan)要(yao)(yao)(yao)(yao)經過割機(ji)進(jin)行(xing)(xing)切割，切割成長度約(yue)一米的(de)(de)(de)(de)(de)坯料。然后(hou)進(jin)入退火流(liu)程(cheng)，退火要(yao)(yao)(yao)(yao)用酸性液體(ti)進(jin)行(xing)(xing)酸洗(xi)，酸洗(xi)時要(yao)(yao)(yao)(yao)注意表面(mian)是否有(you)(you)大(da)量(liang)的(de)(de)(de)(de)(de)起泡產生(sheng)，如(ru)果有(you)(you)大(da)量(liang)的(de)(de)(de)(de)(de)起泡產生(sheng)說明(ming)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)質(zhi)量(liang)達不到相應的(de)(de)(de)(de)(de)標(biao)準。外觀上冷軋(ya)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)要(yao)(yao)(yao)(yao)短于熱(re)軋(ya)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)，冷軋(ya)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)壁厚(hou)一般(ban)比熱(re)軋(ya)無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)要(yao)(yao)(yao)(yao)小，但是表面(mian)看(kan)起來比厚(hou)壁無(wu)縫(feng)(feng)(feng)(feng)鋼管(guan)(guan)(guan)更加明(ming)亮，表面(mian)沒(mei)有(you)(you)太多的(de)(de)(de)(de)(de)粗糙(cao)，口(kou)徑也沒(mei)有(you)(you)太多的(de)(de)(de)(de)(de)毛(mao)刺。
熱軋無縫鋼管的(de)(de)交貨狀態一般是熱軋狀態經過(guo)(guo)熱處(chu)理(li)后進(jin)行交貨。熱軋無縫鋼管在(zai)經過(guo)(guo)質(zhi)(zhi)檢后要(yao)經過(guo)(guo)工作人員的(de)(de)嚴格(ge)的(de)(de)手(shou)工挑(tiao)選，在(zai)質(zhi)(zhi)檢后要(yao)進(jin)行表面涂油，然后緊接著是多(duo)次的(de)(de)冷拔實(shi)驗(yan)，熱軋處(chu)理(li)后要(yao)進(jin)行穿(chuan)孔的(de)(de)實(shi)驗(yan)，如果穿(chuan)孔擴徑(jing)過(guo)(guo)大就要(yao)進(jin)行矯(jiao)直矯(jiao)正。在(zai)矯(jiao)直后再由(you)傳(chuan)送(song)裝置傳(chuan)送(song)到(dao)(dao)探傷機進(jin)行探傷實(shi)驗(yan)，*后貼上(shang)標簽、進(jin)行規格(ge)編排后放置到(dao)(dao)到(dao)(dao)倉庫當中。
圓管(guan)坯(pi)→加熱→穿孔(kong)→三輥斜軋、連(lian)軋或(huo)擠(ji)壓→脫管(guan)→定徑（或(huo)減徑）→冷(leng)卻→矯(jiao)直→水壓試驗（或(huo)探傷(shang)）→標(biao)記→入庫(ku) 無(wu)縫鋼管(guan)是用鋼錠(ding)或(huo)實心管(guan)坯(pi)經(jing)穿孔(kong)制(zhi)(zhi)成毛管(guan)，然(ran)后經(jing)熱軋、冷(leng)軋或(huo)冷(leng)撥制(zhi)(zhi)成。無(wu)縫鋼管(guan)的規(gui)格(ge)用外徑*壁(bi)厚毫米數表(biao)示。
熱軋無縫管(guan)外徑一般大于(yu)32mm，壁厚(hou)2.5-200mm，冷軋無縫鋼管(guan)外徑可(ke)以到6mm，壁厚(hou)可(ke)到0.25mm，薄壁管(guan)外徑可(ke)到5mm壁厚(hou)小于(yu)0.25mm，冷軋比熱軋尺寸精度(du)高。
一(yi)般(ban)用無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)(gang)管(guan)是用10、20、30、35、45等優質碳(tan)結鋼(gang)(gang)(gang)(gang)16Mn、5MnV等低(di)合金(jin)結構鋼(gang)(gang)(gang)(gang)或(huo)40Cr、30CrMnSi、45Mn2、40MnB等合結鋼(gang)(gang)(gang)(gang)熱軋或(huo)冷軋制(zhi)成(cheng)的(de)。10、20等低(di)碳(tan)鋼(gang)(gang)(gang)(gang)制(zhi)造的(de)無(wu)(wu)(wu)縫管(guan)主要用于流體輸送管(guan)道。45、40Cr等中碳(tan)鋼(gang)(gang)(gang)(gang)制(zhi)成(cheng)的(de)無(wu)(wu)(wu)縫管(guan)用來制(zhi)造機(ji)械(xie)零件，如汽車、拖拉機(ji)的(de)受力(li)零件。一(yi)般(ban)用無(wu)(wu)(wu)縫鋼(gang)(gang)(gang)(gang)管(guan)要保證強度和壓扁試驗。熱軋鋼(gang)(gang)(gang)(gang)管(guan)以熱軋狀態或(huo)熱處理(li)狀態交(jiao)(jiao)貨(huo)；冷軋以熱處理(li)狀態交(jiao)(jiao)貨(huo)。

熱(re)軋(ya)(ya)(ya)，顧名(ming)思(si)義(yi)，軋(ya)(ya)(ya)件(jian)的溫度(du)高(gao)，因此變形(xing)抗力小，可以實現(xian)大(da)的變形(xing)量。以鋼(gang)板的軋(ya)(ya)(ya)制為例(li)，一般(ban)連鑄(zhu)坯(pi)厚度(du)在230mm左(zuo)右，而(er)經過粗軋(ya)(ya)(ya)和精(jing)軋(ya)(ya)(ya)，*終(zhong)厚度(du)為1~20mm。同時，由于(yu)鋼(gang)板的寬厚比(bi)小，尺寸精(jing)度(du)要求相對低，不容(rong)易出現(xian)板形(xing)問題，以控制凸度(du)為主(zhu)。對于(yu)組(zu)織有(you)要求的，一般(ban)通過控軋(ya)(ya)(ya)控冷來實現(xian)，即控制精(jing)軋(ya)(ya)(ya)的開軋(ya)(ya)(ya)溫度(du)、終(zhong)軋(ya)(ya)(ya)溫度(du).圓管(guan)坯(pi)→加熱(re)→穿孔→打頭→退(tui)火→酸洗→涂(tu)油（鍍銅）→多道(dao)次冷拔(ba)（冷軋(ya)(ya)(ya)）→坯(pi)管(guan)→熱(re)處理(li)→矯(jiao)直(zhi)→水(shui)壓(ya)試(shi)驗（探(tan)傷）→標記(ji)→入庫。