GB标准)钢管壁厚等级(Sch)表示方法
钢管的壁厚等级系列的表示方法在不同标准中所表示的方法各不相同。主要有三种表示方法: 
1) 以管子表号(Sch)表示: 
对于碳钢管壁厚有:Sch10、20、30、40、60、80、100、120、140、160等10个等级(若数字后面加S,表示不锈钢管); 
对于不锈钢壁厚系列有:5S、10S、40S、80S四个等级 
2)以管子重量表示,如STD(标准重量),XS(加厚管),XXS(特厚管) 
3)以钢管壁厚尺寸表示,即“管外径×壁厚”,如φ89X4 
  
钢管壁厚分级表(GB标准) 
  
| 
 公 称 直 径 DN  | 
 外径(D)  | 
 公称壁厚  |  
| 
 A系列  | 
 B系列  | 
 Sch 5s  | 
 Sch 10s  | 
 Sch 20s  | 
 LG  | 
 Sch 20  | 
 Sch 30  | 
 STD  | 
 Sch 40  | 
 Sch 60  | 
 XS  | 
 Sch 80  | 
 Sch 100  | 
 Sch 120  | 
 Sch 140  | 
 Sch 180  |  
| 
 15 20 25  | 
 21.3 26.9 33.7  | 
 18 25 32  | 
 1.6 1.6 1.6  | 
 2.1 2.1 2.8  | 
 2.6 2.6 3.2  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 2.9 2.9 3.2  | 
 - - -  | 
 - - -  | 
 3.6 4.0 4.5  | 
 - - -  | 
 - - -  | 
 - - -  | 
 4.5 5.6 6.3  |  
| 
 32 40 50  | 
 42.4 48.3 60.3  | 
 38 45 57  | 
 1.6 1.6 1.6  | 
 2.8 2.8 2.8  | 
 3.2 3.2 3.6  | 
 - - -  | 
 - - 3.2  | 
 - - -  | 
 - - -  | 
 3.6 3.6 4.0  | 
 - - -  | 
 - - -  | 
 5.0 5.0 5.6  | 
 - - -  | 
 - - -  | 
 - - -  | 
 6.3 7.1 8.8  |  
| 
 65 80 90  | 
 76.1 88.9 101.6  | 
 76 89 -  | 
 2.0 2.0 2.0  | 
 3.0 3.0 3.0  | 
 3.6 4.0 4.0  | 
 - - -  | 
 4.5 4.5 4.5  | 
 - - -  | 
 - - -  | 
 5.0 5.6 5.6  | 
 - - -  | 
 - - -  | 
 7.1 8.0 8.0  | 
 - - -  | 
 - - -  | 
 - - -  | 
 10.0 11.0 12.5  |  
| 
 100 125 150  | 
 114.3 139.7 168.3  | 
 108 133 159  | 
 2.0 2.9 2.9  | 
 3.0 3.4 3.4  | 
 4.0 5.0 5.0  | 
 - - -  | 
 5.0 5.0 5.6  | 
 - - -  | 
 - - -  | 
 5.9 6.3 7.1  | 
 - - -  | 
 - - -  | 
 8.8 10.0 11.0  | 
 - - -  | 
 11.0 12.5 14.2  | 
 - - -  | 
 14.2 16.0 17.5  |  
| 
 200 250 300  | 
 219.1 273.0 323.9  | 
 219 273 325  | 
 2.9 3.6 4.0  | 
 4.0 4.0 4.5  | 
 6.3 6.3 6.3  | 
 - - -  | 
 6.3 6.3 6.3  | 
 7.1 8.0 8.8  | 
 - - -  | 
 8.0 8.8 10.0  | 
 10.0 12.5 14.2  | 
 - - -  | 
 12.5 16.0 17.5  | 
 16.0 17.5 22.2  | 
 17.5 22.2 25.0  | 
 20.0 25.0 28.0  | 
 22.2 28.0 32.0  |  
| 
 350 400 450 500 550 600  | 
 355.6 406.4 457.0 508.0 559 610  | 
 377 426 478 529 - 630  | 
 4.0 4.0 4.0 5.0 5.0 5.6  | 
 5.0 5.0 5.0 5.6 5.6 6.3  | 
 - - -  | 
 8.0 8.0 8.0 8.0 8.0 8.0  | 
 8.0 8.0 8.0 10.0 - -  | 
 10.0 10.0 11.0 12.5 - -  | 
 10.0 10.0 10.0 10.0 10.0 10.0  | 
 11.0 12.5 14.2 16.0 - 17.5  | 
 16.0 17.5 20.0 20.0 - -  | 
 13.0 13.0 13.0 13.0 13.0 13.0  | 
 20.0 22.2 25.0 28.0 30.0 32.0  | 
 25.8 28.5 30.0 32.0 - -  | 
 28.0 30.0 36.0 40.0 - -  | 
 32.0 36.0 40.0 45.0 - -  | 
 36.0 40.0 45.0 50.0 - -  |  
| 
 650 700 750  | 
 660 711 762  | 
 - 720 -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 8.0 8.0 8.0  | 
 - - -  | 
 - - -  | 
 10.0 10.0 10.0  | 
 - - -  | 
 - - -  | 
 13.0 13.0 13.0  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  |  
| 
 800 850 900  | 
 813 864 914  | 
 820 - 920  | 
 - - -  | 
 - - -  | 
 - - -  | 
 8.0 8.0 8.0  | 
 - - -  | 
 - - -  | 
 10.0 10.0 10.0  | 
 - - -  | 
 - - -  | 
 13.0 13.0 13.0  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  |  
| 
 950 1000 1050  | 
 965 1016 1067  | 
 - 1020 -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 8.0 8.0 8.0  | 
 - - -  | 
 - - -  | 
 10.0 10.0 10.0  | 
 - - -  | 
 - - -  | 
 13.0 13.0 13.0  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  |  
| 
 1100 1150 1200  | 
 1118 1168 1219  | 
 1120 - 1220  | 
 - - -  | 
 - - -  | 
 - - -  | 
 8.0 8.0 8.0  | 
 - - -  | 
 - - -  | 
 10.0 10.0 10.0  | 
 - - -  | 
 - - -  | 
 13.0 13.0 13.0  | 
 - - -  | 
 - - -  | 
 - - -  | 
 - - -  | 
 -  |     |