12寸大口径钢管直径ㄧDN350大口径钢管外径是多少毫米ㄧ寸与dn的转换

 尺寸  对应DN                                           精确外径     国标统称外径

       8寸  DN200                                           φ219.1          φ219
     10寸  DN250                                           φ273             φ273
     12寸 DN300                                            φ323.9          φ325
     14寸 DN350                                            φ355.6          φ377
     16寸 DN400                                            φ406.4          φ427
     18寸 DN450                                            φ457             φ480
     20寸 DN500                                            φ508             φ530
     24寸 DN600                                            φ610             φ630
     28寸 DN700                                            φ711             φ720
     32寸 DN800                                            φ813             φ820
     36寸 DN900                                            φ914             φ920
     40寸 DN1000                                          φ1016           φ1020

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