黄色视频三级

鍋爐(lu)鋼管是指兩端開口并(bing)具有中(zhong)空斷(duan)面，其長度與周邊之比較大的鋼材，按生產方法可分(fen)為和焊接(jie)鋼(gang)管(guan)，鍋爐(lu)鋼(gang)管(guan)的(de)規格(ge)用(yong)(yong)外形尺(chi)(chi)寸 。鍋爐(lu)鋼(gang)管(guan)(如(ru)外徑(jing)或邊(bian)長)及壁厚表示，其(qi)尺(chi)(chi)寸范圍很廣，從(cong)直徑(jing)很小的(de)毛(mao)細管(guan)直到(dao)直徑(jing)達數(shu)米的(de)大口(kou)徑(jing)管(guan)。鋼(gang)管(guan)可用(yong)(yong)于管(guan)道(dao)、熱工設備、機械工業、石油地質(zhi)勘探、容器、化(hua)學工業和特殊用(yong)(yong)途。鋼(gang)管(guan)的(de)分類：鋼(gang)管(guan)分和(he)(he)焊接鋼(gang)管(guan)(guan)(guan)(有縫管(guan)(guan)(guan))兩大類。按斷(duan)面形(xing)(xing)(xing)(xing)狀又可分(fen)為(wei)圓管(guan)(guan)(guan)和(he)(he)異(yi)形(xing)(xing)(xing)(xing)管(guan)(guan)(guan)，廣泛應用的(de)是圓形(xing)(xing)(xing)(xing)鋼(gang)管(guan)(guan)(guan)，但(dan)也(ye)有一些方形(xing)(xing)(xing)(xing)、矩形(xing)(xing)(xing)(xing)、半圓形(xing)(xing)(xing)(xing)、六角形(xing)(xing)(xing)(xing)、等邊(bian)三角形(xing)(xing)(xing)(xing)、八角形(xing)(xing)(xing)(xing)等異(yi)形(xing)(xing)(xing)(xing)鋼(gang)管(guan)(guan)(guan)。 對于承受流體壓(ya)力的(de)鋼(gang)管(guan)(guan)(guan)都要(yao)(yao)進(jin)行(xing)液(ye)壓(ya)試(shi)驗來(lai)檢驗其耐壓(ya)能力和(he)(he)質(zhi)量，在規定的(de)壓(ya)力下不(bu)發生泄漏(lou)、浸濕或(huo)膨脹為(wei)合格，有些鋼(gang)管(guan)(guan)(guan)還要(yao)(yao)根據(ju)標準或(huo)需(xu)方要(yao)(yao)求進(jin)行(xing)卷邊(bian)試(shi)驗、擴口試(shi)驗、壓(ya)扁試(shi)驗等。60-159*4-20