35crmo厚壁鋼管中的(de)DN表示什(shen)么意思(si)?

DN一般用于35crmo厚壁鋼管中，DN是公稱通徑，公稱通徑(nominal diameter)，又稱平均外徑(mean outside diameter)。 公稱通徑是管路系統中所有管路附件用數字表示的尺寸，35crmo厚壁鋼管公稱通徑用字(zi)母“DN”后面(mian)緊跟一個數字(zi)標(biao)志。

35crmo厚壁鋼管公稱通徑是供參考用的一個方便的圓整數，與加工尺寸僅呈不嚴格的關系。 這是緣自金屬管的管璧很薄，管外徑與管內徑相差無幾，所以取管的外徑與35crmo厚壁鋼管的(de)內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)之平均值(zhi)當作管(guan)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)稱(cheng)(cheng)(cheng)呼(hu)。 DN是(shi)公(gong)(gong)稱(cheng)(cheng)(cheng)通(tong)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing) (或(huo)叫公(gong)(gong)稱(cheng)(cheng)(cheng)通(tong)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)),就是(shi)各(ge)種(zhong)管(guan)子與管(guan)路附(fu)件(jian)(jian)的(de)通(tong)用(yong)口(kou)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)。同一(yi)公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)管(guan)子與管(guan)路附(fu)件(jian)(jian)均能相(xiang)互(hu)連(lian)接(jie)，具有互(hu)換性.它不(bu)(bu)是(shi)實際意(yi)義上的(de)管(guan)道外(wai)(wai)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)或(huo)內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，雖然其數(shu)值(zhi)跟管(guan)道內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)較(jiao)為接(jie)近(jin)或(huo)相(xiang)等；為了使(shi)管(guan)子、管(guan)件(jian)(jian)連(lian)接(jie)尺(chi)寸(cun)統(tong)一(yi)，采用(yong)公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)（公(gong)(gong)稱(cheng)(cheng)(cheng)通(tong)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing))。其公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)不(bu)(bu)是(shi)外(wai)(wai)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，也不(bu)(bu)是(shi)內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，而(er)是(shi)近(jin)似普(pu)通(tong)35crmo厚(hou)壁鋼管(guan)內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)一(yi)個名義尺(chi)寸(cun)。例(li)如35crmo厚(hou)壁鋼管(guan) 每(mei)一(yi)公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，對應一(yi)個外(wai)(wai)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)，其內徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)數(shu)值(zhi)隨厚(hou)度不(bu)(bu)同而(er)不(bu)(bu)同。公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)可用(yong)公(gong)(gong)制mm表(biao)示，也可用(yong)英制in表(biao)示。管(guan)路附(fu)件(jian)(jian)也用(yong)公(gong)(gong)稱(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)徑(jing)(jing)(jing)(jing)(jing)(jing)(jing)表(biao)示，意(yi)義同有縫管(guan)。

 (責任編輯：龍(long)川(chuan)小(xiao)編)

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