是指兩端開口(kou)并具有中空斷(duan)面，其長度與(yu)周邊(bian)之比較大(da)的(de)(de)鋼(gang)(gang)材，按生產方法可(ke)分為無縫鋼(gang)(gang)管(guan)(guan)(guan)(guan)和(he)焊(han)接鋼(gang)(gang)管(guan)(guan)(guan)(guan)，鋼(gang)(gang)管(guan)(guan)(guan)(guan)的(de)(de)規格(ge)用(yong)外形尺(chi)寸(cun)（如外徑或邊(bian)長）及壁厚表示，其尺(chi)寸(cun)范圍很廣，從直徑很小的(de)(de)毛細管(guan)(guan)(guan)(guan)直到直徑達數米的(de)(de)大(da)口(kou)徑管(guan)(guan)(guan)(guan)。鋼(gang)(gang)管(guan)(guan)(guan)(guan)可(ke)用(yong)于管(guan)(guan)(guan)(guan)道、熱工(gong)(gong)設備、機械工(gong)(gong)業、石(shi)油地(di)質勘探、容(rong)器、化學工(gong)(gong)業和(he)特(te)殊用(yong)途。

分類

     鋼(gang)管(guan)分無縫鋼(gang)管(guan)和(he)焊(han)接(jie)鋼(gang)管(guan)（有縫管(guan)）兩(liang)大類。按斷(duan)面(mian)形(xing)(xing)狀又可(ke)分為圓管(guan)和(he)異形(xing)(xing)管(guan)，廣(guang)泛應用(yong)的是圓形(xing)(xing)鋼(gang)管(guan)，但也有一些方形(xing)(xing)、矩形(xing)(xing)、半圓形(xing)(xing)、六(liu)角形(xing)(xing)、等(deng)邊三角形(xing)(xing)、八角形(xing)(xing)等(deng)異形(xing)(xing)鋼(gang)管(guan)。 對(dui)于(yu)承受流(liu)體(ti)壓(ya)(ya)力(li)(li)的鋼(gang)管(guan)都要進行液壓(ya)(ya)試(shi)(shi)(shi)驗(yan)(yan)來檢(jian)驗(yan)(yan)其耐壓(ya)(ya)能(neng)力(li)(li)和(he)質量，在規(gui)定的壓(ya)(ya)力(li)(li)下不(bu)發生泄漏(lou)、浸濕或(huo)膨脹為合格(ge)，有些鋼(gang)管(guan)還要根據標準或(huo)需方要求進行卷(juan)邊試(shi)(shi)(shi)驗(yan)(yan)、擴口試(shi)(shi)(shi)驗(yan)(yan)、壓(ya)(ya)扁試(shi)(shi)(shi)驗(yan)(yan)等(deng)。

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