無(wu)(wu)縫(feng)鋼(gang)管的分類(lei)：無(wu)(wu)縫(feng)鋼(gang)管分熱軋和冷軋（撥）無(wu)(wu)縫(feng)鋼(gang)管兩類(lei)。

熱軋無縫鋼管分一般鋼管，低、中壓鍋爐鋼管，高壓鍋爐鋼管、合金鋼管、不銹鋼管、石油裂化管、地質鋼管和其它鋼管等。
一般用無縫鋼管要保證強度和壓扁試驗。熱軋鋼管以熱軋狀態或熱處理狀態交貨；冷軋以熱處理狀態交貨。
冷(leng)軋(ya)（撥）無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)除(chu)分一般(ban)(ban)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、低(di)中壓鍋(guo)爐(lu)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、高壓鍋(guo)爐(lu)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、合金(jin)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、不銹(xiu)(xiu)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、石油裂(lie)化(hua)管(guan)(guan)(guan)(guan)(guan)、其它鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)外(wai)，還包(bao)括碳(tan)素(su)薄(bo)壁(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、合金(jin)薄(bo)壁(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、不銹(xiu)(xiu)薄(bo)壁(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、異型(xing)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。熱(re)軋(ya)無(wu)縫管(guan)(guan)(guan)(guan)(guan)外(wai)徑一般(ban)(ban)大于(yu) 32mm壁(bi)厚(hou)(hou)2.5-75mm冷(leng)軋(ya)無(wu)縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)處(chu)徑可(ke)以到(dao)6mm壁(bi)厚(hou)(hou)可(ke)到(dao)0.25mm薄(bo)壁(bi)管(guan)(guan)(guan)(guan)(guan)外(wai)徑可(ke)到(dao)5mm壁(bi)厚(hou)(hou)小(xiao)于(yu)0.25mm冷(leng)軋(ya)比熱(re)軋(ya)尺寸精度(du)高。

 A、b類供應的(de)(de)(de)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)，如(ru)用(yong)(yong)(yong)(yong)(yong)(yong)于承(cheng)受(shou)液體壓(ya)(ya)力，也要進行(xing)水(shui)壓(ya)(ya)(特指:壓(ya)(ya)強)試驗。精(jing)密(mi)(mi)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)是(shi)(shi)一種通(tong)過冷(leng)軋或(huo)冷(leng)拔(ba)處理后(hou)的(de)(de)(de)高(gao)(gao)(gao)(gao)精(jing)密(mi)(mi)的(de)(de)(de)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)；全稱：冷(leng)軋或(huo)冷(leng)拔(ba)精(jing)密(mi)(mi)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)。由于精(jing)密(mi)(mi)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)內外壁無(wu)(wu)(wu)氧化(hua)層(ceng)、承(cheng)受(shou)高(gao)(gao)(gao)(gao)壓(ya)(ya)無(wu)(wu)(wu)泄(xie)漏(lou)、高(gao)(gao)(gao)(gao)精(jing)度、高(gao)(gao)(gao)(gao)光潔度、冷(leng)彎不變形、擴(kuo)口、壓(ya)(ya)扁無(wu)(wu)(wu)裂(lie)縫(feng)(feng)(feng)(feng)(feng)等(deng)優(you)點(dian)，所以(yi)主要用(yong)(yong)(yong)(yong)(yong)(yong)來生產(chan)氣動或(huo)液壓(ya)(ya) 元件(jian)(jian)的(de)(de)(de)產(chan)品，如(ru)氣缸或(huo)油缸，都是(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)管(guan)(guan)。精(jing)密(mi)(mi)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)的(de)(de)(de)化(hua)學成分有(you)碳C、硅Si、錳Mn、硫S、磷P、鉻Cr。3、專(zhuan)門用(yong)(yong)(yong)(yong)(yong)(yong)途的(de)(de)(de)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)管(guan)(guan)有(you)鍋爐(lu)（Boilers）用(yong)(yong)(yong)(yong)(yong)(yong)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)管(guan)(guan)、化(hua)工電力用(yong)(yong)(yong)(yong)(yong)(yong)，地(di)質用(yong)(yong)(yong)(yong)(yong)(yong)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)及(ji)石(shi)油用(yong)(yong)(yong)(yong)(yong)(yong)無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)管(guan)(guan)等(deng)多種。 無(wu)(wu)(wu)縫(feng)(feng)(feng)(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)具(ju)有(you)中(zhong)空截面，大量用(yong)(yong)(yong)(yong)(yong)(yong)作輸送流體的(de)(de)(de)管(guan)(guan)道(Conduit)，如(ru)輸送石(shi)油、天然(natural)氣、煤氣、水(shui)及(ji)某些固體物(wu)料(liao)的(de)(de)(de)管(guan)(guan)道等(deng)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)與圓鋼(gang)(gang)(gang)(gang)(gang)等(deng)實(shi)心鋼(gang)(gang)(gang)(gang)(gang)材(cai)相比，在抗彎抗扭強度（strength)相同時，重(zhong)量較(jiao)輕，是(shi)(shi)一種經(jing)濟(Economy)截面鋼(gang)(gang)(gang)(gang)(gang)材(cai)。 廣泛用(yong)(yong)(yong)(yong)(yong)(yong)于制(zhi)造(zao)(zhì zào)結構(Structure)件(jian)(jian)和(he)(he)機械（machinery）零件(jian)(jian)，如(ru)石(shi)油鉆桿、汽車(auto)傳動軸(傳動軸組成:軸管(guan)(guan)、伸縮套和(he)(he)萬向節(jie))、自行(xing)車架以(yi)及(ji)建筑施(shi)工中(zhong)用(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)(de)鋼(gang)(gang)(gang)(gang)(gang)腳(jiao)手架等(deng)用(yong)(yong)(yong)(yong)(yong)(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)制(zhi)造(zao)環形零件(jian)(jian)，可提高(gao)(gao)(gao)(gao)材(cai)料(liao)利用(yong)(yong)(yong)(yong)(yong)(yong)率，簡(jian)化(hua)制(zhi)造(zao)工序，節(jie)約(yue)材(cai)料(liao)和(he)(he)加(jia)工(Processing)工時，已廣泛用(yong)(yong)(yong)(yong)(yong)(yong)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)來制(zhi)造(zao)。