钢管公称通径、外径、壁厚、连接螺纹及推荐流量表

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1、GB/T7307-87非螺纹密封的管螺纹（牙形角55°），GB3091-82、GB3092-82低压流体输送焊接管序号管子口径管子外径㎜尺寸代号牙/寸螺距P㎜基本直径㎜外螺纹大径公差㎜内螺纹小径公差㎜mmin英吋分大径中径小径下偏差上偏差下偏差上偏差161/810G1/81280.9079.7289.1478.566-0.21400+0.282281/413.5G1/42191.33713.15712.30111.445-0.250+0.4453103/817G3/8316.66215.80614.9504151/22

2、1.3G1/24141.81420.95519.79318.631-0.284+0.5415G5/8522.91121.79420.5876203/426.8G3/4626.44125.27924.1177G7/8730.20129.03927.877825133.5G18112.30933.24931.77030.291-0.360+0.6409G11/8937.89736.41834.939103211/442.3G11/41041.91040.43138.952114011/248G11/21247.80346.

3、32444.84512G13/41453.74652.26750.7881350260G21659.61458.13556.65614G21/41865.71064.23162.752-0.434156521/275G21/22075.18473.70572.22616G23/42281.53480.05578.5761780388.5G32487.88486.40584.926181004114G432113.030124.251110.072191255140G540138.430136.951135.472201

4、506165G648163.830162.351160.872备注：1、（GB3091-82、GB3092-82）公称口径表示内径的参考尺寸2、对各种规格的钢管，其外径决定于YB2822-57《圆锥状管螺纹的尺寸》3、实际内径随管壁厚而变化，公称直径不等于外径减2倍壁厚。钢管公称通径、外径、壁厚、连接螺纹及推荐流量表（JB827-55、JB/Z95-67）序号公称通径DN纲管外径㎜接头螺纹钢管壁厚推荐流量流速m/s㎜in公制GB2878-81英吋公称压力MpaL./minm3/s≤2.5≤8≤16≤25≤31.5136

5、M5×0.811111.40.63248M8×11111.41.42.54.17×10-53.3235（6）1/810M10×1G1/81111.61.66.31.05×10-45.35（3.72）481/4M14×1.5G1/4111.622254.17×10-48.3510（12）3/818M18×1.5G3/811.61.622.5406.67×10-48.5（5.9）6151/222M22×1.5G1/21.61.622.53631.05×10-35.97203/428M27×2G3/41.622.53.541

6、001.67×10-35.3825134M33×2G12234.551602.670×10-35.493211/442M42×2G11/422.54562504.17×10-35.2104011/250M48×2*G11/22.534.55.574006.67×10-35.31150263M60×2G233.556.58.56301.05×10-25.35126521/2753.54681010001.67×10-25.041380390457101212502.088×10-24.16141004120568.525

7、004.17×10-25.31备注1、（GB2878-81）油气口连接螺纹尺寸，除以上表列11种螺纹外，还包括M12×1.5、M16×1.5、M50×2。2、流速根据推荐流量和公称通径算出。