黑退鋼管廠家
91香蕉視頻app下載:
鍍(du)鋅鋼(gang)管(guan)(guan)(guan)(guan)分為(wei)冷(leng)鍍(du)鋅鋼(gang)管(guan)(guan)(guan)(guan)、熱(re)鍍(du)鋅鋼(gang)管(guan)(guan)(guan)(guan),冷(leng)鍍(du)鋅鋼(gang)管(guan)(guan)(guan)(guan)已被(bei)禁(jin)用(yong)(yong),后者還被(bei)提倡暫(zan)時能使(shi)用(yong)(yong)。六七十年代,國際上發(fa)(fa)達開始(shi)開發(fa)(fa)新(xin)型管(guan)(guan)(guan)(guan)材,并陸續禁(jin)用(yong)(yong)鍍(du)鋅管(guan)(guan)(guan)(guan)。中國建(jian)(jian)設部等四部委(wei)也(ye)發(fa)(fa)文(wen)明確從2000年起禁(jin)用(yong)(yong)鍍(du)鋅管(guan)(guan)(guan)(guan)作為(wei)供(gong)水管(guan)(guan)(guan)(guan),新(xin)建(jian)(jian)小(xiao)區(qu)的冷(leng)水管(guan)(guan)(guan)(guan)已經很(hen)少(shao)使(shi)用(yong)(yong)鍍(du)鋅管(guan)(guan)(guan)(guan)了,有些(xie)小(xiao)區(qu)的熱(re)水管(guan)(guan)(guan)(guan)使(shi)用(yong)(yong)的是鍍(du)鋅管(guan)(guan)(guan)(guan)。建(jian)(jian)筑(zhu)用(yong)(yong)管(guan)(guan)(guan)(guan)-熱(re)鍍(du)鋅鋼(gang)管(guan)(guan)(guan)(guan)在消防、電力和(he)高速公路上有廣泛(fan)的應用(yong)(yong)。
聯系電話
微信掃一掃