1、無縫鋼管公稱直徑、外徑請問：無縫鋼管的公稱直徑和其內徑、外徑是一回事嗎？管子的直徑可分為外徑、內徑、公稱直徑。管材為無縫鋼管的管子的外徑用字母。來表示，其后附加外直徑的尺寸和壁厚，例如外徑為108的無縫鋼管，壁厚為5mm,用0 108X5表示，無縫鋼管、鋼筋混凝土管、鑄鐵管、鍍鋅鋼管等在設計圖紙 中一般采用公稱直徑來表示，采用 DN表示，公稱直徑是為了設計制造和維修的方便 人為地規定的一種標準，也稱公稱通徑，是管子（或者管件）的規格名稱。管子的公 稱直徑和其內徑、外徑都不相等，例如：公稱直徑為100 mm的無縫鋼管有102X5、108X5等好幾種，108為管子的外徑，5表示管子的壁厚，因此，該

2、鋼管的內徑為（108 X5-5） =98 mm,但是它不完全等于鋼管外徑減兩倍壁厚之差，也可以說，公稱直徑 是接近于內徑，但是又不等于內徑的一種管子直徑的規格名稱，在設計圖紙中所以要 用公稱直徑，目的是為了根據公稱直徑可以確定管子、管件、閥門、法蘭、墊片等結 構尺寸與連接尺寸，公稱直徑采用符號 DN表示，如果在設計圖紙中采用外徑表示， 也應該作出管道規格對照表，表明某種管道的公稱直徑、壁厚。壓力容器常用的是輸送流體用無縫鋼管（GB8163）。以下是常用無縫鋼管公稱直徑與外徑的對照：DN-公稱直徑外徑DN156 22mmDN206 27mmDN256 34mmDN326 42mmDN406 48

3、mmDN50cb 60mmDN65cb 76(73)mmDN806 89mmDN100也 114mmDN1256 140mmDN1506 168mmDN2006 219mmDN2506 273mmDN3006 324mmDN3506 360mmDN4006 406mmDN4506 457mmDN5006 508mmDN6006 610mmDN-公稱直徑外徑DN206 25mmDN256 32mmDN326 38mmDN406 45mmDN506 57mmDN656 73mmDN806 89mmDN1006 108mmDN1256 133mmDN1506 159mmDN2006 219mmDN2

4、506 273mmDN3006 325mmDN3506 377 mmDN4006 426mmDN4506 480mmDN5006 530mmDN6006 630mm:、無縫鋼管單位重量表無縫鋼管單位重量表熱軋無縫鋼管每米重量表|冷拔（軋）無縫鋼管每米重量表（理論重量）1 .熱軋無縫鋼管每米重量表DN外徑（毫壁厚（毫米）米）2.533.544.555.566.577.5理論重量（公斤/米）2532L822.152.462.763.053.333.593.854.094.324.53382.192.592.983.353.724.074.414.745.055.355.64422.442.893.

5、353.754.164.564.955.335.696.046.38452.623.113.584.044.494.935.365.776.176.566.94502.933.484.014.545.055.556.046.516.977.427.8654-3.774.364.935.496.046.587.107.618.118.605057-4.004.625.235.836.416.997.558.108.639.1660-4.224.885.526.166.787.397.998.589.159.7163.5-4.485.185.876.557.217.878.519.149.7510

6、.3668-4.815.576.317.057.778.489.179.8610.5311.1970-4.965.746.517.278.018.759.4710.1810.8811.5673-5.186.006.817.608.389.169.9110.6611.3912.116576-5.406.267.107.938.759.5610.3611.1411.9112.6783-一6.867.798.719.6210.5111.3912.2613.1213.968089-一7.388.389.3810.3611.3312.2813.2214.1615.0795-7.908.9810.0411

7、.1012.1413.1714.1915.1916.18102-一8.509.6710.8211.9613.0914.2115.3116.4017.48100108-10.2611.4912.7013.9015.0916.2717.4418.59114-10.8512.1513.4414.7215.9817.2318.4719.70DN外徑（毫米）壁厚（毫米）2.533.544.555.566.577.5理論重量（公斤/米）121-11.5412.9314.3015.6717.0218.3519.6820.99127-12.1313.5915.0416.4817.9019.3220.7222.

8、10125133-12.7314.2615.7817.2918.7920.2821.7523.21140-15.0416.6518.2419.8321.4022.9624.51146-15.7017.3919.0620.7222.3624.0025.62152-16.3718.1319.8721.6023.3225.0326.73150159-17.1518.9920.8222.6424.4526.2428.02168-20.1022.0423.9725.8927.7929.69180-21.5923.7025.7527.7029.8731.91194r-23.3125.6027.8230.0

9、032.2834.50203-29.1431.5033.8336.16200219-31.5234.0636.6039.12245-38.2341.0943.85250273-42.6445.9249.10299-一-一一-53.91300325-一-一一-58.74351-一-一一-350377-一-一一-402-一-一一-400426-一-一一-459-一-一一-(465)-一-一一-450480-一-一一-外徑（毫米）M厚（毫米）88.599.5101112131415理論重量（公斤/米）324.74一-一一一-385.92-一-一-426.717.027.327.607.88-457.

10、307.657.998.328.63-508.29_8.709.109.499.86-549.089.549.9910.4310.8511.67-579.6710.1710.6511.1311.5912.4813.3214.11-60(10.2610.8011.3211.8312.3313.2914.2115.0715.88-63.510.9511.5312.1012.6513.1914.2415.2416.1917.09-6811.8412.4713.1013.7114.3015.4616.5717.6318.6419.617012.2312.8913.5414.1714.8016.0117

11、.1718.2719.3320.357312.8213.5214.2114.8815.5416.8218.0519.2420.3721.467613.4214.1514.8715.5816.2817.6318.9420.2021.4122.578314.8015.6216.4217.2218.0019.5321.0222.4423.8225.158915.9816.8717.7618.6319.4821.1622.7924.3725.8927.379517.1618.1319.0920.0320.9622.7924.5626.2927.9729.59外徑（毫米）壁厚（毫米）88.599.510

12、1112131415理論重量（公斤/米）10218.5519.6020.6421.6722.6924.6926.5328.6330.3832.1810819.7320.8621.9723.0824.1726.3128.4130.4632.4534.4011420.9122.1223.3124.4825.6527.9430.1932.3834.5336.6212122.2923.5824.8626.1227.3729.8432.2634.6236.9439.2112723.4824.8426.1927.5328.8531.4734.0336.5539.0141.4313324.6626.1027

13、.5228.9330.3333.1035.8138.4741.0943.6514026.0427.5729.0830.5732.0634.9937.8840.7243.5046.2414627.2328.8230.4131.9833.5436.6239.6642.6445.5748.4615228.4130.0831.7433.3935.0238.2541.4344.5647.6550.6815929.7931.5533.2935.0336.7540.1543.5046.8150.0653.2716831.5733.4335.2937.1338.9742.5946.1749.6953.1756

14、.6018033.9335.9537.9539.9541.9245.8549.7253.5457.3161.0419436.7038.8941.0643.2345.3849.6453.8658.0362.1566.2220338.4740.7743.0545.3347.5952.0856.5260.9165.9469.5421941.6344.1246.6149.0851.5456.4361.2666.0470.7875.4624546.7649.5652.3855.1757.9563.4868.9574.3879.7683.0827352.2855.4558.6061.7364.8671.0

15、777.2483.3689.4295.44外徑（毫米）M 厚（o）88.599.5101112131415W論重量（公斤/米）29957.4160.8964.3767.8371.2778.1384.9391.6998.40105.0632562.5466.3570.1473.9277.6885.1892.63100.03 10)7.38 1146835167.6771.8075.9180.0184.1092.23100.32 1()8.36 11635 1242)377-81.6886.1090.5199.29108.02 17.00 12533 1339402-87.2191.9596.67

16、106.06 15.41 12471 133.94143.15426-92.5597.57102.59 112.58 12252 1324142.25 152.04450-97.87103.20 108.50 119.08 130.61140.09 150.52 160.90(465)-101.10 116.48 11220 123.15134.05 144.90 15(i.70 166.461480-104.52 110.22 11590 127.22139.49 149.71 16().88 172.00500-108.96 114.91 12083 132.65145.41 156.12

17、 16''.79 179.40530-115.62 121.94 12883 140.78154.29 165.74 17f1.14 190.50(550)-120.07 126.62 13310 146.21159.20 172.15 18(i.05 197.90560-122.28 128.97 13563 148.92> 163.16 175.36 18f150 201.60600-131.17 138.34 14550 159.78，175.00 188.18 20：131 216.39630-137.81 145.36 15289 167.91183.88 19

18、7.80 21!.67 227.49外徑（毫米）壁厚（毫米）161718192022(24)25(26)28理論重量（公斤/米）32-一一-38-一一-42-一-45-一-50-一一-54-.-57一-一-60-一-63.5-一-6820.52.-7021.31.-7322.4923.4824.4125.30一-7623.6824.7425.7526.71一-8326.4427.6728.8529.99一-8928.8030.1931.5232.8034.0336.3538.47-9531.1732.7034.1835.6136.9939.6142.02-外徑（毫米）壁厚（毫米）1617181

19、92022(24)25(26)28理論重量（公斤/米）10233.9335.6437.2938.8940.4443.4046.17-10836.3038.1539.9541.7043.4046.6649.7251.1752.5855.2411438.6740.6742.6244.5146.3649.9153.2754.8756.4359.3812141.4343.6045.7247.7949.8253.7157.4159.1960.9164.2212743.8046.1248.3950.6152.7856.9760.9662.8964.7668.3613346.1748.6351.0553.4

20、255.7360.2264.5166.5968.6172.5014048.9351.5754.1656.7059.1964.0268.6670.9073.1077.3414651.3054.0856.8259.5162.1567.2772.2174.6076.9481.4815253.6656.6059.4862.3265.1170.5975.7678.3080.7985.6215956.4359.5362.5965.6068.5674.3379.9082.6285.2890.4616859.9863.3166.5969.8273.0079.2185.2388.1691.0596.671806

21、4.7168.3471.9175.4478.9285.7292.3395.5698.74104.9619470.2474.2178.1382.0085.2893.32100.62104.19107.72114.6320373.7877.9782.1286.2190.2698.20105.94109.74113.49120.8321980.1084.6989.2393.7198.15106.88115.42119.61123.75131.8924590.3695.59100.77105.90110.98120.99130.80135.64140.42149.84273101.41107.3311

22、3.20119.02124.79136.18147.38152.90158.38169.18外徑米）（毫壁厚（毫米）161718192022(24)25(26)28理論重量（公斤/米）299111.67118.23 12:4.74131.20 13)7.61150.29162.77 1(58.93 17505 187.13325121.93129.12 13628143.38 15)0.44164.39178.15 134.96 19172 205.09351132.19140.03 14782155.56 163.26178.50193.54 2()0.99 20839 223.043771

23、42.44150.93 15936167.75 1776.08192.61208.93 217.02 22506 240.99402152.30161.40 170.45179.45 181 8.40206.16223.72 2332.42 24108 258.24 J426161.78171.47 18H.11190.71 20)0.25219.19237.93 2417.23 25648 274.83 J450171.24181.52 19)1.76201.94 212.08232.20252.12 2(52.01 27185 291.38 1(465)177.16187.81 19)8.

24、41208.97 219.47240.34261.00 27126 28147 301.74480183.08194.10 2()5.07216.00 226.87248.47269.88 2830.51 29109 312.10500190.97202.48 23.95225.37 23674259.32281.72 29)2.84 30391 325.91530202.80215.06 227.27239.42 25)1.53275.60299.47 317.50 32314 346.62(550)210.70223.44 23614248.80 26)1.40286.45311.31 3

25、2>3.66 33597 360.43560214.64227.64 240.58253.48 26)6.33291.88317.23 -600230.42244.40 25i8.34272.22 286.06313.58340.90 -630242.26256.98 271.66286.28 300.85329.85358.66 -外徑（毫米）壁厚（毫米）3032(34)(35)36(38)40(42)(45)理論重量（公斤/米）12771.76一一-一-13376.2079.71一-一-14081.3885.2388.8890.6392.33-14685.8289.9793.9195

26、.8197.66-15290.2694.7098.94100.99 1C2.99 -15995.44100.22 10)4.81 10703 109.201 -168102.10107.33 112.36 11480 117.19 121.83 126.27 13().51 136.50180110.98116.80 12!2.42 12516 127.85)133.07 138.10 14；2.94 149.82194121.33127.85 13416 13724 140.27,146.19 151.91 15'7.44 165.3，6203127.99134.94 14.1.70

27、 14500 148.26i 154.62 160.78 16(5.75 175.313219139.83147.57 15512 15882 162.47,169.62 176.58 18：3.33 193.10245159.07168.09 176.92 18126 185.55)193.99 202.22 21().26 221.95273179.78190.19 20)0.40 20543 210.41220.23 229.85 23<127 253.03外徑（毫米）壁厚（毫米）3032(34)(35)36(38)40(42)(45)理論重量（公斤/米）299199.02 210

28、.71 222.20 227.87233.50 244.59 255.49 266.20 281.88325218.25 231.23 244.00 250.31256.53 268.94 281.14 293.13 310.73351237.49 251.74 265.80 272.76279.66 293.32 306.76 320.06 339.59377256.73 272.26 287.61 295.20302.77 317.69 332.44 346.99 368.44402275.21 291.18 30855 316.76324.92 341.10 357.08 372.86

29、396.16426292.98 310.93 32869 337.49346.27 363.61 380.77 397.74 422.82450310.72 329.84 348.79 358.19367.53 386.08 404.42 422.56 449.43(465)321.81 341.69 361.37 371.13380.85 400.13 419.22 438.11 466.07480332.91 353.52 373.94 384.08394.17 414.19 436.01 453.64 482.72500347.71 369.30 390.71 401.34411.92

30、432.93 453.74 474.35 504.91530369.90 92.92415.87 427.23 438.55 461.04483.34 505.42 538.2。(550)384.70 406.76 432.64 444.3C456.31 479.79 503.06 526.15 560.40外徑（毫米）壁厚（毫米）(48)50566063(65)7075理論重量（公斤/米）203183.47188.65 -一-一-219202.41208.38 -一-245233.25240.44 -一-273266.40274.96 -一-299297.10307.02 335.57 35

31、3.62 366.64375.08 395.30 414.29325327.90339.10 371.49 392.09 407.04416.75 440.34 462.28351358.68371.16 407.40 430.59 447.43458.43 485.24 510.46377389.45403.22 442.30 469.06 484.82500.14 529.98 558.55402419.02434.01 477.81 506.02 526.66540.17 573.10 604.79426447.46463.64 510.97 541.57 560.47578.68 61

32、4.56 649.21450475.84493.20 544.10 577.04 601.24617.12 655.96 693.56(465)493.59511.70 564.83 599.24 624.54641.16 681.84 721.31480511.35530.19 585.53 621.43 632.31665.20 707.74 749.05500535.02554.85 613.15 651.02 678.91697.26 742.27 786.04530570.53591.84 654.58 695.41 725.52745.35 794.05 841.52(550)59

33、4.21616.50 682.19 725.00 756.59777.41 828.58 878.51注：1、括號內的尺寸不推薦使用。2、鋼管長度：312.5米。2 .冷拔（軋）無縫鋼管每米重量表（理論重量）外徑（毫米）壁厚（毫米）0.250.300.400.500.600.801.01.21.4理論重量（公斤/米）50.02920.0348 0.()454 0.0550.0650.0830.0990.1120.12460.03540.0421 0.()550.0680.0800.1030.1230.1420.15970.04160.0496 0.(0650.0800.0950.1220.14

34、80.1720.19380.04770.0570.0750.0920.1100.1420.1730.2020.22790.0540.0640.0850.1050.1250.1620.1970.2310.262100.0600.0720.0950.1170.1390.1820.2220.2610.296110.0660.0790.1050.1290.1540.2010.2470.2900.331120.0720.0870.1150.1420.1690.2210.2710.3200.365(13)0.0790.0940.1240.1540.1840.2410.2960.3490.400140.08

35、50.1010.1340.1660.1990.2600.3210.3790.434(15)0.0910.1090.1440.1790.2140.2800.3450.4090.468160.0970.1160.1540.1910.2280.3000.3700.4380.503(17)0.1030.1240.1640.2030.2440.3200.3950.4680.537180.1090.1310.1740.2160.2580.3400.4190.4970.572(19)0.1150.1380.1830.2280.2740.3590.4440.5270.606200.1220.1460.1930

36、.2400.2880.3790.4690.5560.642外徑（毫米）怛厚（毫米）0.250.300.400.500.600.801.01.21.4理論重量（公斤/米）(21)-0.2030.2530.3030.3990.4930.5860.67522-0.2120.2650.3180.4190.5180.6160.710(23)-0.2220.2770.3330.4380.5430.6450.745(24)-0.2360.2900.3470.4580.5670.6740.77925-0.2420.3020.3630.4780.5920.7030.813(27)-0.2620.3270.392

37、0.5160.6410.7620.88228-0.2720.3400.4060.5360.6660.7920.91629-0.2820.3520.4180.5530.6910.8230.95130-0.2920.3640.4360.5760.7150.8510.98632-0.3110.3890.4660.6150.7650.9101.0534-0.3310.4130.4960.6550.8140.9681.12(35)-0.3410.4260.5100.6750.8380.9981.1636-0.3500.4380.5250.6950.8631.031.1938-0.3700.4640.55

38、50.7340.9121.091.2640-0.3900.4940.5850.7740.9621.151.3342-一-1.01-1.211.4144.5-一-11.07-1.281.48(51)-一一一一1.231.471.7153-一一一一1.281.531.78(54)-一一一一1.311.591.8256-一一一一1.361.621.89(57)-一一一一1.381.651.9260-一一一一1.461.742.0263-一一一一1.531.832.1365-一一一一1.581.892.20(68)-一一一一1.651.982.3070-一一一一1.702.032.37(73)-一一一

39、一1.782.122.4775-一一一一1.822.182.54外徑（毫米）壁厚（毫米）1.51.61.82.02.22.52.83.03.2理論重量（公斤/米）50.1290.134-60.1660.1740.1860.197-70.2030.2130.2300.2470.2600.277-80.2400.2530.2750.2960.3150.339-90.2770.2920.3190.3450.3690.4010.427-100.3140.3320.3630.3950.4230.4620.4960.5180.536110.3510.3710.4070.4440.4770.5240.5660.5920.615120.3880.4110.4520.4930.5320.5860.6350.6660.694(13)0.4250.4510.4960.5430.5850.6470.7030.7400.774140.4620.4900.5410.5920.6400.7090.7720.8140.852(15)0.4990.5290.5850.6410.6940.7710.84