大口徑厚壁鋼管廠家-大口徑厚壁鋼管現貨-大口徑厚壁鋼管規格

　　大口徑厚壁鋼管切割多少錢

　　大口徑厚壁鋼管知識大全

　　一般來說，管子的直徑可分為外徑、內徑、公稱直徑。管材為厚壁鋼管的(de)(de)(de)管子的(de)(de)(de)外(wai)(wai)徑(jing)(jing)用 字母D來(lai)表示，其后附加外(wai)(wai)直徑(jing)(jing)的(de)(de)(de)尺寸和壁厚.

　　例如外徑為108的厚壁鋼管，壁厚為5MM，用D108*5表示，塑料管也用外徑表示，如De63，其他如鋼筋混凝土管、鑄鐵管、鍍鋅厚壁鋼管等采用(yong)DN表(biao)示(shi)，在(zai)(zai)設(she)(she)計(ji)圖(tu)紙中一般(ban)采用(yong)公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)來表(biao)示(shi)，公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)是(shi)為(wei)(wei)了設(she)(she)計(ji)制造(zao)和維修(xiu)的方便人為(wei)(wei)地規(gui)定的一種標(biao)準(zhun)，也較公(gong)(gong)稱(cheng)(cheng)通徑(jing)(jing)(jing)，是(shi)管(guan)(guan)(guan)(guan)子(或者管(guan)(guan)(guan)(guan)件(jian))的規(gui)格名稱(cheng)(cheng)。管(guan)(guan)(guan)(guan)子的公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)和其內(nei)徑(jing)(jing)(jing)、外徑(jing)(jing)(jing)都(dou)不(bu)相(xiang)等，厚(hou)壁(bi)(bi)(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)例如(ru)：公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)為(wei)(wei)100MM的厚(hou)壁(bi)(bi)(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)郵(you)102*5、108*5等好幾種，108為(wei)(wei)管(guan)(guan)(guan)(guan)子的外徑(jing)(jing)(jing)，5表(biao)示(shi)管(guan)(guan)(guan)(guan)子的壁(bi)(bi)(bi)厚(hou)，因(yin)此，該厚(hou)壁(bi)(bi)(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)的內(nei)徑(jing)(jing)(jing)為(wei)(wei)(108*5-5)=98MM，但(dan)(dan)是(shi)它不(bu)完全(quan)等于(yu)(yu)(yu)厚(hou)壁(bi)(bi)(bi)鋼(gang)(gang)管(guan)(guan)(guan)(guan)外徑(jing)(jing)(jing)減兩倍壁(bi)(bi)(bi)厚(hou)之差，也可(ke)(ke)以說，公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)是(shi)接近于(yu)(yu)(yu)內(nei)徑(jing)(jing)(jing)，但(dan)(dan)是(shi)又不(bu)等于(yu)(yu)(yu)內(nei)徑(jing)(jing)(jing)的一種管(guan)(guan)(guan)(guan)子直徑(jing)(jing)(jing)的規(gui)格名稱(cheng)(cheng)，在(zai)(zai)設(she)(she)計(ji)圖(tu)紙中所以要用(yong)公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)，目的是(shi)為(wei)(wei)了根據公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)可(ke)(ke)以確定管(guan)(guan)(guan)(guan)子、管(guan)(guan)(guan)(guan)件(jian)、閥門、法蘭(lan)、墊(dian)片(pian)等結構(gou)尺寸與連(lian)接尺寸，公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)采用(yong)符號(hao)DN表(biao)示(shi)，如(ru)果(guo)在(zai)(zai)設(she)(she)計(ji)圖(tu)紙中采用(yong)外徑(jing)(jing)(jing)表(biao)示(shi)，也應(ying)該作(zuo)出管(guan)(guan)(guan)(guan)道規(gui)格對照表(biao)，表(biao)明某種管(guan)(guan)(guan)(guan)道的公(gong)(gong)稱(cheng)(cheng)直徑(jing)(jing)(jing)，壁(bi)(bi)(bi)厚(hou)。