ASME 36.10- 2004 钢管 标准 NPS XS Schedule DN OD Wall Thk Mass [Note (1)] or XXS No. Note 2 mm mm kg/m 1/8" . 10 6 10.3 1.24 0.28 1/8" . 30 6 10.3 1.45 0.32 1/8" STD 40 6 10.3 1.73 0.37 1/8" XS 80 6 10.3 2.41 0.47 1/4" . 10 8 13.7 1.65 0.49 1/4" . 30 8 13.7 1.85 0.54 1/4" STD 40 8 13.7 2.24 0.63 1/4" XS 80 8 13.7 3.02 0.8 3/8" . 10 10 17.1 1.65 0.63 3/8" . 30 10 17.1 1.85 0.7 3/8" STD 40 10 17.1 2.31