黄瓜视频下载

鍋爐鋼(gang)管是指兩端(duan)開口(kou)并具有中空(kong)斷面(mian)，其長度與周邊之比較大的鋼(gang)材(cai)，按生(sheng)產方法可分為和焊(han)接(jie)鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)，鍋爐鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的(de)規格用(yong)外形尺寸(cun) 。鍋爐鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(如外徑(jing)或邊長)及壁厚表示，其尺寸(cun)范圍很(hen)廣，從直徑(jing)很(hen)小的(de)毛(mao)細管(guan)(guan)(guan)(guan)(guan)直到直徑(jing)達數米的(de)大口(kou)徑(jing)管(guan)(guan)(guan)(guan)(guan)。鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)可用(yong)于管(guan)(guan)(guan)(guan)(guan)道(dao)、熱工(gong)設(she)備(bei)、機械工(gong)業、石油(you)地(di)質(zhi)勘探、容(rong)器(qi)、化學工(gong)業和特殊用(yong)途。鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的(de)分(fen)類：鋼(gang)(gang)管(guan)(guan)(guan)(guan)(guan)分(fen)和焊接(jie)鋼管(guan)(有縫管(guan))兩大類。按(an)斷(duan)面形(xing)(xing)狀又可分為圓(yuan)(yuan)管(guan)和異(yi)形(xing)(xing)管(guan)，廣泛(fan)應用的(de)是圓(yuan)(yuan)形(xing)(xing)鋼管(guan)，但(dan)也有一些(xie)方形(xing)(xing)、矩形(xing)(xing)、半(ban)圓(yuan)(yuan)形(xing)(xing)、六(liu)角形(xing)(xing)、等邊三角形(xing)(xing)、八(ba)角形(xing)(xing)等異(yi)形(xing)(xing)鋼管(guan)。 對于承(cheng)受(shou)流體壓(ya)(ya)力的(de)鋼管(guan)都要(yao)進行液壓(ya)(ya)試驗(yan)(yan)來(lai)檢(jian)驗(yan)(yan)其耐(nai)壓(ya)(ya)能力和質(zhi)量，在規定的(de)壓(ya)(ya)力下不發生(sheng)泄漏、浸濕或膨脹為合格，有些(xie)鋼管(guan)還要(yao)根據(ju)標準或需方要(yao)求進行卷邊試驗(yan)(yan)、擴(kuo)口試驗(yan)(yan)、壓(ya)(ya)扁試驗(yan)(yan)等。60-159*4-20