不锈钢外径.壁厚尺寸对照表▲DN公称直径（英寸）参考表
不锈钢管规格表的DN是表示的公称直径，代表不了钢管的壁厚。1寸=DN25。以此类推4寸=DN100等等。 1寸=DN25，外径32。2寸=DN50，外径57。
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Dimensions for ASME/ANSI Standards
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Unit:mm
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B16.9 B16.28 B36.10
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Nominal pipe Size(NPS)
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Outside Diameter
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Nominal Wall Thickness
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Sch5s
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SCH10S
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Sch20
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Sch30
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Sch40
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STD
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Sch80
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XS
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Sch160
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XXS
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||||
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8
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1/4
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13.7
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0.54
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-
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1.65
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-
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1.85
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2.24
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2.24
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3.02
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3.02
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-
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-
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10
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3/8
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17.1
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0.675
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-
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1.65
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-
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1.85
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2.31
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2.31
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3.20
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3.20
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-
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-
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15
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1/2
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21.3
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0.84
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1.65
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2.11
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-
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2.41
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2.77
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2.77
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3.73
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3.73
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4.78
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7.47
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20
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3/4
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26.7
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1.05
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1.65
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2.11
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-
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2.41
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2.87
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2.87
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3.91
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3.91
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5.56
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7.82
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25
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1
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33.4
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1.32
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1.65
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2.77
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-
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2.90
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3.38
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3.38
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4.55
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4.55
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6.35
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9.09
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32
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1.1/4
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42.2
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1.66
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1.65
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2.77
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-
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2.97
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3.56
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3.56
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4.85
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4.85
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6.35
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9.70
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40
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1.1/2
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48.3
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1.90
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1.65
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2.77
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-
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3.18
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3.68
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3.68
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5.08
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5.08
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7.14
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10.15
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50
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2
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60.3
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2.38
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1.65
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2.77
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-
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3.18
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3.91
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3.91
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5.54
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5.54
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8.74
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11.07
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65
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2.1/2
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73.0
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2.88
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2.11
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3.05
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-
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4.78
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5.16
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5.16
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7.01
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7.01
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9.53
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14.02
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80
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3
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88.9
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3.50
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2.11
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3.05
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-
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4.78
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5.49
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5.49
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7.62
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7.62
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11.13
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15.24
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90
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3.1/2
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101.6
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4.00
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2.11
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3.05
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-
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4.78
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5.74
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5.74
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8.08
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8.08
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-
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-
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100
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4
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114.3
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4.50
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2.11
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3.05
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-
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4.78
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6.02
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6.02
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8.56
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8.56
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13.49
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17.12
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125
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5
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141.3
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5.56
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2.77
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3.40
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-
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-
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6.55
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6.55
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9.53
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9.53
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15.88
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19.05
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150
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6
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168.3
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6.62
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2.77
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3.40
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-
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-
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7.11
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7.11
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10.97
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10.97
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18.26
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21.96
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200
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8
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219.1
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8.62
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2.77
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3.76
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6.35
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7.04
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8.18
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8.18
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12.70
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12.70
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23.01
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22.23
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250
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10
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273.0
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10.75
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3.40
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4.19
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6.35
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7.80
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9.27
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9.27
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15.09
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12.70
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28.58
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25.40
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300
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12
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323.8
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12.75
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3.96
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4.57
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6.35
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8.38
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10.13
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9.53
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17.48
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12.70
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33.32
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25.40
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350
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14
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355.6
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14
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3.96
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4.78
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7.92
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9.53
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11.13
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9.53
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19.05
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12.70
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35.71
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-
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400
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16
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406.4
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16
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4.19
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4.78
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7.92
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9.53
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12.70
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9.53
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21.44
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12.70
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40.49
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-
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450
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18
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457
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18
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4.19
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4.78
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7.92
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11.13
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14.27
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9.53
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23.83
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12.70
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45.24
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-
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500
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10
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508
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20
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4.78
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5.54
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9.53
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12.70
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15.09
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9.53
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26.19
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12.70
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50.01
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-
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550
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22
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559
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22
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4.78
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5.54
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9.53
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12.70
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-
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9.53
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28.58
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12.70
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53.98
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-
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600
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24
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610
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24
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5.54
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6.35
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9.53
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14.27
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17.48
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9.53
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30.96
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12.70
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59.54
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-
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650
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*26
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660
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26
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-
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-
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-
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-
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-
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9.53
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-
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12.70
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-
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-
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700
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*28
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711
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28
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-
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-
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-
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-
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-
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9.53
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-
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12.70
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-
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-
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750
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*30
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762
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30
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-
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-
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-
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-
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-
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9.53
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-
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12.70
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-
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-
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800
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*32
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813
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32
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-
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-
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-
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-
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-
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9.53
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-
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12.70
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-
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-
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