G.I. Pipe
- ScopeSpecification for ERW screwed and socket steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 PIPE threads.
Applicable to tubes of nominal size DN 8mm to DN 150mm in light, medium and heavy thicknesses - Chemical composition
| Grade | Mfg. Process | Chemical composition(%) | ||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
| – | S,W | 0.20 | – | 1.2 | 0.045Max | 0.045Max | – | – | – | – |
- Mechanical Properties
| Grade
|
Tensile Test MPa or N/mm2 | Elongation (%) | Remaks
(Similar to JIS) |
Possibility Temperature | |
| Min Yield point
|
Tensile Strength
|
||||
| – | 20(195)min | 325~460 | 20min | (SGP) | |
- Dimensions, Mass and Dimensional Tolerance
| Nominal diameter | (LIGHT) (BSL) | |||||
| Tolerances on outside diameter OD(mm) | Tolerances on wall thickness | BPE | ||||
| Weight (kg/m) | ||||||
| DN | Standard | Tolerances | Tolerances-8% | Tolerances – 8% | ||
| Standard | minimum | Standard | minimum | |||
| 15 | 21.2 | ±0.2 | 2.0 | 1.84 | 0.947 | 0.88 |
| 20 | 26.65 | ±0.25 | 2.3 | 2.12 | 1.38 | 1.27 |
| 25 | 33.5 | ±0.3 | 2.6 | 2.40 | 1.98 | 1.83 |
| 32 | 42.2 | ±0.3 | 2.6 | 2.40 | 2.54 | 2.34 |
| 40 | 48.1 | ±0.3 | 2.9 | 2.67 | 3.23 | 2.98 |
| 50 | 59.9 | ±0.3 | 2.9 | 2.67 | 4.08 | 3.76 |
| 65 | 75.6 | ±0.4 | 3.2 | 2.95 | 5.71 | 5.26 |
| 80 | 88.3 | ±0.4 | 3.2 | 2.95 | 6.72 | 6.19 |
| 100 | 113.45 | ±0.4 | 3.6 | 3.32 | 9.75 | 8.97 |
| 125 | ±0.4 | |||||
| 150 | ±0.4 | |||||
| Nominal diameter | (MEDIUM) (BSM) | |||||
| Tolerances on outside diameter OD(mm) | Tolerances on wall thickness | BPE | ||||
| Weight (kg/m) | ||||||
| DN | Standard | Tolerances | -10% | Tolerances -8% +10% | ||
| Standard | minimum | Standard | minimum | |||
| 15 | 21.4 | ±0.3 | 2.6 | 2.34 | 1.21 | 1.12 |
| 20 | 26.9 | ±0.3 | 2.6 | 2.34 | 1.56 | 1.44 |
| 25 | 33.8 | ±0.4 | 3.2 | 2.88 | 2.41 | 2.22 |
| 32 | 42.5 | ±0.4 | 3.2 | 2.88 | 3.10 | 2.86 |
| 40 | 48.4 | ±0.4 | 3.2 | 2.88 | 3.57 | 3.29 |
| 50 | 60.3 | ±0.5 | 3.6 | 3.24 | 5.03 | 4.63 |
| 65 | 76.0 | ±0.6 | 3.6 | 3.24 | 6.43 | 5.92 |
| 80 | 88.8 | ±0.7 | 4.0 | 3.60 | 8.37 | 7.70 |
| 100 | 114.1 | ±0.8 | 4.5 | 4.05 | 12.2 | 11.23 |
| 125 | 139.65 | ±0.95 | 5.0 | 4.50 | 16.6 | 15.28 |
| 150 | 165.1 | ±1.0 | 5.0 | 4.50 | 19.7 | 18.13 |
| Nominal diameter | (HEAVY) (BSH) | |||||
| Tolerances on outside diameter OD(mm) | Tolerances on wall thickness | BPE | ||||
| Weight (kg/m) | ||||||
| DN | Standard | Tolerances | Tolerances -10% | Tolerances -8% +10% | ||
| Standard | minimum | Standard | minimum | |||
| 15 | 21.4 | ±0.3 | 3.2 | 2.88 | 1.44 | 1.33 |
| 20 | 26.9 | ±0.3 | 3.2 | 2.88 | 1.87 | 1.73 |
| 25 | 33.8 | ±0.4 | 4.0 | 3.6 | 2.94 | 2.71 |
| 32 | 42.5 | ±0.4 | 4.0 | 3.6 | 3.8 | 3.50 |
| 40 | 48.4 | ±0.4 | 4.0 | 3.6 | 4.38 | 4.03 |
| 50 | 60.3 | ±0.5 | 4.5 | 4.05 | 6.19 | 5.7 |
| 65 | 76.0 | ±0.6 | 4.5 | 4.05 | 7.93 | 7.30 |
| 80 | 88.8 | ±0.7 | 5.0 | 4.5 | 10.3 | 9.48 |
| 100 | 114.1 | ±0.8 | 5.4 | 4.86 | 14.5 | 13.35 |
| 125 | 139.65 | ±0.95 | 5.4 | 4.86 | 17.9 | 16.47 |
| 150 | 165.1 | ±1.0 | 5.4 | 4.86 | 21.3 | 19.60 |
