角(jiao)鋼(gang)(gang)俗稱(cheng)角(jiao)鐵、是兩邊(bian)(bian)(bian)互相(xiang)垂直成(cheng)角(jiao)形的(de)長條鋼(gang)(gang)材(cai)。有等(deng)(deng)邊(bian)(bian)(bian)角(jiao)鋼(gang)(gang)和(he)不(bu)等(deng)(deng)邊(bian)(bian)(bian)角(jiao)鋼(gang)(gang)之分。等(deng)(deng)邊(bian)(bian)(bian)角(jiao)鋼(gang)(gang)的(de) 兩個邊(bian)(bian)(bian)寬相(xiang)等(deng)(deng)。其規格以(yi)邊(bian)(bian)(bian)寬×邊(bian)(bian)(bian)寬×邊(bian)(bian)(bian)厚(hou)的(de)毫米數表(biao)示。如(ru)“∟30×30×3”，即表(biao)示邊(bian)(bian)(bian)寬為(wei) 30毫米、邊(bian)(bian)(bian)厚(hou)為(wei)3毫米的(de)等(deng)(deng)邊(bian)(bian)(bian)角(jiao)鋼(gang)(gang)。也可(ke)用(yong)(yong)型號表(biao)示，型號是邊(bian)(bian)(bian)寬的(de)厘米數，如(ru)∟3#。型號不(bu)表(biao)示同一(yi)型號中不(bu)同邊(bian)(bian)(bian)厚(hou)的(de)尺寸，因而在合同等(deng)(deng)單據上將角(jiao)鋼(gang)(gang)的(de)邊(bian)(bian)(bian)寬、邊(bian)(bian)(bian)厚(hou)尺寸填寫齊(qi)全(quan)，避免單獨用(yong)(yong)型號表(biao)示。熱(re)軋等(deng)(deng)邊(bian)(bian)(bian)角(jiao)鋼(gang)(gang)的(de)規格為(wei)2#-20#。角(jiao)鋼(gang)(gang)可(ke)按結(jie)構(gou)(gou)的(de)不(bu)同需(xu)要組成(cheng)各(ge)種不(bu)同的(de)受力構(gou)(gou)件，也可(ke)作(zuo)構(gou)(gou)件之間的(de)連接件。廣泛地用(yong)(yong)于各(ge)種建筑結(jie)構(gou)(gou)和(he)工程(cheng)結(jie)構(gou)(gou)，如(ru)房梁、橋梁、輸電塔、起重(zhong)運輸機械、船舶、工業爐、反(fan)應塔、容器架(jia)以(yi)及(ji)倉庫。