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国标管径DN15、DN20、DN25、DN32、DN40、DN50，内、外径 …
管道dn20外径是508毫米，内径是488毫米； 管道DN25外径是635毫米，内径是615毫米； 管道DN32外径是812.8毫米，内径是792.8毫米；
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国标管径DN15、DN20、DN25、DN32、DN40、DN50，内、外径 …
亲，国标管径dn15、dn20、dn25、dn32、dn40、dn50的内、外径尺寸如下： 1. DN15：内径15mm，外径23mm，壁厚4mm 2. DN20：内径20mm，外径27mm，壁厚3.5mm 3.