異(yi)型(xing)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)是除了(le)圓管(guan)(guan)(guan)以外(wai)的(de)(de)其他截(jie)面形(xing)狀(zhuang)的(de)(de)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)的(de)(de)總稱(cheng)。按鋼管(guan)(guan)(guan)截(jie)面形(xing)狀(zhuang)尺寸的(de)(de)不同又可(ke)分為(wei)等(deng)壁(bi)厚(hou)異(yi)型(xing)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)（代號(hao)為(wei)D）、不等(deng)壁(bi)厚(hou)異(yi)型(xing)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)（代號(hao)為(wei)BD）、變直徑(jing)異(yi)型(xing)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)（代號(hao)為(wei)BJ）。由(you)于合金無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)的(de)(de)材質性(xing)能較高，其具有(you)良(liang)好的(de)(de)耐腐蝕，合肥(fei)無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)，在(zai)一些(xie)特殊環境中使用也不易被(bei)腐蝕造成(cheng)管(guan)(guan)(guan)道(dao)的(de)(de)老化，降低了(le)工程的(de)(de)成(cheng)本，使用壽命也較長一些(xie)。無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)的(de)(de)生(sheng)產方(fang)(fang)法很多(duo)。無(wu)縫(feng)(feng)(feng)鋼管(guan)(guan)(guan)根據(ju)交(jiao)貨(huo)要求，可(ke)用熱軋(ya)(ya)(約(yue)占(zhan)80～90％)或(huo)冷(leng)軋(ya)(ya)、冷(leng)拔(ba)（約(yue)占(zhan)10～20％）方(fang)(fang)法生(sheng)產。熱軋(ya)(ya)管(guan)(guan)(guan)用的(de)(de)坯料有(you)圓形(xing)、方(fang)(fang)形(xing)或(huo)多(duo)邊形(xing)的(de)(de)錠、軋(ya)(ya)坯或(huo)連鑄(zhu)管(guan)(guan)(guan)坯，無(wu)縫(feng)(feng)(feng)管(guan)(guan)(guan)價格，管(guan)(guan)(guan)坯質量(liang)對管(guan)(guan)(guan)材質量(liang)有(you)直接的(de)(de)影響。

異(yi)型無(wu)縫管(guan)(guan)廣(guang)泛用(yong)于(yu)各種(zhong)結構件(jian)、工(gong)具(ju)和機械(xie)零部件(jian)。由于(yu)合金無(wu)縫管(guan)(guan)的(de)(de)材(cai)質性能較高(gao)，無(wu)縫管(guan)(guan)制(zhi)造廠家，其(qi)具(ju)有良好的(de)(de)耐腐(fu)蝕，在(zai)(zai)一(yi)些特(te)殊環境中(zhong)使用(yong)也(ye)不易被腐(fu)蝕造成管(guan)(guan)道的(de)(de)老化，降低了工(gong)程的(de)(de)成本(ben)，使用(yong)壽命(ming)也(ye)較長一(yi)些。無(wu)縫管(guan)(guan)以(yi)其(qi)優異(yi)的(de)(de)產品(pin)(pin)性能一(yi)直在(zai)(zai)管(guan)(guan)材(cai)領域(yu)有著特(te)殊的(de)(de)地位，以(yi)其(qi)復雜(za)的(de)(de)軋(ya)制(zhi)工(gong)藝(yi)、高(gao)昂的(de)(de)軋(ya)制(zhi)成本(ben)和坯料成本(ben)，價(jia)格通常遠(yuan)遠(yuan)高(gao)于(yu)其(qi)他管(guan)(guan)材(cai)品(pin)(pin)種(zhong)，以(yi)至于(yu)市場充斥著試(shi)圖替(ti)代無(wu)縫管(guan)(guan)的(de)(de)“假無(wu)縫”的(de)(de)焊管(guan)(guan)。

無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)的(de)生產(chan)方法(fa)很多(duo)。無(wu)(wu)縫(feng)(feng)鋼管(guan)(guan)(guan)根(gen)據交貨要求，可用(yong)(yong)(yong)(yong)熱(re)軋(ya)(ya)(約占(zhan)80～90％)或冷(leng)(leng)軋(ya)(ya)、冷(leng)(leng)拔（約占(zhan)10～20％）方法(fa)生產(chan)。熱(re)軋(ya)(ya)管(guan)(guan)(guan)用(yong)(yong)(yong)(yong)的(de)坯(pi)料有(you)圓形、方形或多(duo)邊形的(de)錠、軋(ya)(ya)坯(pi)或連鑄管(guan)(guan)(guan)坯(pi)，管(guan)(guan)(guan)坯(pi)質(zhi)量對(dui)管(guan)(guan)(guan)材(cai)質(zhi)量有(you)直接的(de)影(ying)響。冷(leng)(leng)拔或冷(leng)(leng)軋(ya)(ya)精密無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)（GB3639-83）是(shi)用(yong)(yong)(yong)(yong)于(yu)機械結構、液壓(ya)設備的(de)尺寸精度高和(he)(he)表面(mian)光潔度好的(de)冷(leng)(leng)拔或冷(leng)(leng)軋(ya)(ya)精密無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)。選用(yong)(yong)(yong)(yong)精密無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)制(zhi)造機械結構或液壓(ya)設備等。高壓(ya)鍋爐(lu)(lu)用(yong)(yong)(yong)(yong)無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)（GB5310-2008）是(shi)用(yong)(yong)(yong)(yong)于(yu)制(zhi)造高壓(ya)及其以上壓(ya)力的(de)水管(guan)(guan)(guan)鍋爐(lu)(lu)受(shou)熱(re)面(mian)用(yong)(yong)(yong)(yong)的(de)碳素(su)鋼、合金鋼和(he)(he)不銹耐熱(re)鋼無(wu)(wu)縫(feng)(feng)管(guan)(guan)(guan)。