用(yong)于制(zhi)造管(guan)(guan)(guan)(guan)子、管(guan)(guan)(guan)(guan)件(jian)和(he)附(fu)件(jian)的(de)鑄鐵(tie)，其析出的(de)石墨經預處理后成明顯(xian)球狀的(de)稱為(wei)球墨鑄鐵(tie)。和(he)灰鑄鐵(tie)相比，球墨鑄鐵(tie)除具有(you)(you)(you)較高的(de)抗拉強度外，還具有(you)(you)(you)灰鑄鐵(tie)材料所不具備的(de)塑(su)性(xing)(xing)、韌性(xing)(xing)和(he)低溫沖擊性(xing)(xing)。球墨鑄鐵(tie)管(guan)(guan)(guan)(guan)（以(yi)下(xia)簡稱球鐵(tie)管(guan)(guan)(guan)(guan)）、管(guan)(guan)(guan)(guan)件(jian)和(he)附(fu)件(jian)用(yong)途很廣(guang)，主(zhu)要(yao)有(you)(you)(you)：輸送水（包括飲用(yong)水、污水）管(guan)(guan)(guan)(guan)道；輸送壓(ya)力級別(bie)為(wei)中壓(ya)A級及以(yi)下(xia)的(de)燃氣（如人工煤氣、天然(ran)氣、液化石油(you)氣等(deng)）管(guan)(guan)(guan)(guan)道；有(you)(you)(you)壓(ya)或無壓(ya)力管(guan)(guan)(guan)(guan)道；地(di)下(xia)或地(di)上鋪設管(guan)(guan)(guan)(guan)道等(deng)。

  球墨(mo)鑄鐵管件的分類(lei)由各種接口形(xing)式派生而得(de)。球墨(mo)鑄鐵管件的種類(lei)見表6-1。