草莓视频在线下载

鍋(guo)爐鋼(gang)管是指兩端開口(kou)并具有(you)中空斷面，其長度與周邊(bian)之(zhi)比較大(da)的鋼(gang)材，按生產方法可分為(wei)和(he)焊接鋼(gang)管(guan)(guan)，鍋爐鋼(gang)管(guan)(guan)的(de)(de)規(gui)格用(yong)外形尺寸 。鍋爐鋼(gang)管(guan)(guan)(如外徑(jing)或邊長(chang))及壁厚表示，其尺寸范圍很廣，從直(zhi)徑(jing)很小的(de)(de)毛細(xi)管(guan)(guan)直(zhi)到(dao)直(zhi)徑(jing)達數米的(de)(de)大口徑(jing)管(guan)(guan)。鋼(gang)管(guan)(guan)可用(yong)于管(guan)(guan)道、熱工設備(bei)、機(ji)械工業、石油地質勘(kan)探、容(rong)器、化學(xue)工業和(he)特(te)殊用(yong)途。鋼(gang)管(guan)(guan)的(de)(de)分(fen)類：鋼(gang)管(guan)(guan)分(fen)和焊(han)接(jie)鋼(gang)(gang)管(guan)(guan)(有(you)縫管(guan)(guan))兩大類。按斷面形(xing)(xing)狀又可(ke)分為圓管(guan)(guan)和異形(xing)(xing)管(guan)(guan)，廣泛應用的是圓形(xing)(xing)鋼(gang)(gang)管(guan)(guan)，但(dan)也有(you)一些方(fang)形(xing)(xing)、矩形(xing)(xing)、半(ban)圓形(xing)(xing)、六角形(xing)(xing)、等(deng)邊(bian)三角形(xing)(xing)、八角形(xing)(xing)等(deng)異形(xing)(xing)鋼(gang)(gang)管(guan)(guan)。 對(dui)于(yu)承受流(liu)體(ti)壓(ya)力的鋼(gang)(gang)管(guan)(guan)都要進行液壓(ya)試驗(yan)(yan)(yan)(yan)來檢驗(yan)(yan)(yan)(yan)其耐壓(ya)能力和質量，在(zai)規定(ding)的壓(ya)力下不(bu)發生泄漏、浸濕或膨脹為合格，有(you)些鋼(gang)(gang)管(guan)(guan)還要根據標準或需方(fang)要求進行卷邊(bian)試驗(yan)(yan)(yan)(yan)、擴口(kou)試驗(yan)(yan)(yan)(yan)、壓(ya)扁試驗(yan)(yan)(yan)(yan)等(deng)。60-159*4-20