Stainless steel seamless and welded pipe is ordered against ASME B36.19M “S” schedules (5S, 10S, 40S, 80S), which use thinner wall thicknesses than the carbon steel B36.10M schedules of the same number — always confirm whether a buyer means 40S or 40 before quoting. Weights below cover Grade 304/304L and 316/316L, the two most widely stocked austenitic grades.
Weight Calculation Formula
Metric Formula: W = π × ρ × t × (D − t) ÷ 1,000,000
Where: W = Weight (kg/m), D = OD (mm), t = Wall Thickness (mm), ρ = density (kg/m³)
Density used: Grade 304/304L ≈ 7,930 kg/m³, Grade 316/316L ≈ 7,980 kg/m³ (316’s higher molybdenum/nickel content makes it marginally denser than 304).
NB 1/2″ to 12″ — Weight by Schedule
Schedule 5S
| NB (in) | OD (mm) | Wall (mm) | Wt – Gr 304 (kg/m) | Wt – Gr 316 (kg/m) |
|---|---|---|---|---|
| 1/2 | 21.3 | 1.65 | 0.81 | 0.81 |
| 3/4 | 26.7 | 1.65 | 1.03 | 1.04 |
| 1 | 33.4 | 1.65 | 1.31 | 1.31 |
| 1-1/4 | 42.2 | 1.65 | 1.67 | 1.68 |
| 1-1/2 | 48.3 | 1.65 | 1.92 | 1.93 |
| 2 | 60.3 | 1.65 | 2.41 | 2.43 |
| 2-1/2 | 73.0 | 2.11 | 3.73 | 3.75 |
| 3 | 88.9 | 2.11 | 4.56 | 4.59 |
| 4 | 114.3 | 2.11 | 5.90 | 5.93 |
| 5 | 141.3 | 2.77 | 9.56 | 9.62 |
| 6 | 168.3 | 2.77 | 11.42 | 11.50 |
| 8 | 219.1 | 2.77 | 14.93 | 15.02 |
| 10 | 273.1 | 3.41 | 22.91 | 23.06 |
| 12 | 323.9 | 3.97 | 31.64 | 31.84 |
Schedule 10S
| NB (in) | OD (mm) | Wall (mm) | Wt – Gr 304 (kg/m) | Wt – Gr 316 (kg/m) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.11 | 1.01 | 1.02 |
| 3/4 | 26.7 | 2.11 | 1.29 | 1.30 |
| 1 | 33.4 | 2.77 | 2.11 | 2.13 |
| 1-1/4 | 42.2 | 2.77 | 2.72 | 2.74 |
| 1-1/2 | 48.3 | 2.77 | 3.14 | 3.16 |
| 2 | 60.3 | 2.77 | 3.97 | 4.00 |
| 2-1/2 | 73.0 | 3.05 | 5.32 | 5.35 |
| 3 | 88.9 | 3.05 | 6.52 | 6.56 |
| 4 | 114.3 | 3.05 | 8.45 | 8.51 |
| 5 | 141.3 | 3.41 | 11.71 | 11.79 |
| 6 | 168.3 | 3.41 | 14.01 | 14.10 |
| 8 | 219.1 | 3.76 | 20.17 | 20.30 |
| 10 | 273.1 | 4.20 | 28.14 | 28.31 |
| 12 | 323.9 | 4.58 | 36.43 | 36.66 |
Schedule 40S
| NB (in) | OD (mm) | Wall (mm) | Wt – Gr 304 (kg/m) | Wt – Gr 316 (kg/m) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.77 | 1.28 | 1.29 |
| 3/4 | 26.7 | 2.87 | 1.70 | 1.71 |
| 1 | 33.4 | 3.38 | 2.53 | 2.54 |
| 1-1/4 | 42.2 | 3.56 | 3.43 | 3.45 |
| 1-1/2 | 48.3 | 3.69 | 4.10 | 4.13 |
| 2 | 60.3 | 3.92 | 5.51 | 5.54 |
| 2-1/2 | 73.0 | 5.16 | 8.72 | 8.78 |
| 3 | 88.9 | 5.49 | 11.41 | 11.48 |
| 4 | 114.3 | 6.02 | 16.24 | 16.34 |
| 5 | 141.3 | 6.56 | 22.02 | 22.16 |
| 6 | 168.3 | 7.12 | 28.59 | 28.77 |
| 8 | 219.1 | 8.18 | 42.98 | 43.25 |
| 10 | 273.1 | 9.28 | 60.99 | 61.38 |
| 12 | 323.9 | 9.53 | 74.64 | 75.11 |
Schedule 80S
| NB (in) | OD (mm) | Wall (mm) | Wt – Gr 304 (kg/m) | Wt – Gr 316 (kg/m) |
|---|---|---|---|---|
| 1/2 | 21.3 | 3.74 | 1.64 | 1.65 |
| 3/4 | 26.7 | 3.92 | 2.22 | 2.24 |
| 1 | 33.4 | 4.55 | 3.27 | 3.29 |
| 1-1/4 | 42.2 | 4.86 | 4.52 | 4.55 |
| 1-1/2 | 48.3 | 5.08 | 5.47 | 5.50 |
| 2 | 60.3 | 5.54 | 7.56 | 7.61 |
| 2-1/2 | 73.0 | 7.01 | 11.52 | 11.60 |
| 3 | 88.9 | 7.62 | 15.43 | 15.53 |
| 4 | 114.3 | 8.56 | 22.55 | 22.69 |
| 5 | 141.3 | 9.53 | 31.28 | 31.48 |
| 6 | 168.3 | 10.98 | 43.03 | 43.31 |
| 8 | 219.1 | 12.70 | 65.30 | 65.72 |
| 10 | 273.1 | 12.70 | 82.39 | 82.91 |
| 12 | 323.9 | 12.70 | 98.46 | 99.08 |
Figures are theoretical nominal weights per ASME B36.19M dimensions; actual mill weights may vary within standard tolerance. Seamless Steel Industries supplies both seamless and welded SS pipe in 304/304L and 316/316L across this full size range, with EN 10204 3.1 MTC on every dispatch — request a quotation with your exact size, schedule, and grade.