| Steel Grade | Chemical Composition | Mechanical Property | ||||||
| C (Max) | Mn (Max) | P (Max) | S (Max) | TENSILE ( Min ) | YIELD ( Min ) | Elongation | ||
| Mpa | Mpa | % | ||||||
| Grade A | 0.25 | 0.95 | 0.035 | 0.035 | 330 | 205 | 25 to 30% | |
| Grade B | 0.30 | 1.20 | 0.035 | 0.035 | 415 | 240 | 25 to 30% | |
| ASTM A795 (BLACK & GALVANISED) | |||||||||||
| N.D. | O.D. | SCH 10 | SCH 30/40 | ||||||||
| WALL THICKNESS | NOMINAL WEIGHT | WALL THICKNESS | NOMINAL WEIGHT | ||||||||
| (mm) | (inch) | (mm) | (inch) | (mm) | (inch) | (kg/mtrs) | (lbs/ft) | (mm) | (inch) | (kg/mtrs) | (lbs/ft) |
| 15 | 1/2 | 21.3 | 0.84 | —- | —- | —- | —- | 2.77 | 0.109 | 1.27 | 0.85 |
| 20 | 3/4 | 26.7 | 1.05 | 2.11 | 0.083 | 1.28 | 0.96 | 2.87 | 0.113 | 1.69 | 1.13 |
| 25 | 1 | 33.4 | 1.32 | 2.77 | 0.109 | 2.09 | 1.41 | 3.38 | 0.133 | 2.5 | 1.68 |
| 32 | 1-1/4 | 42.2 | 1.66 | 2.77 | 0.109 | 2.69 | 1.81 | 3.56 | 0.14 | 3.39 | 2.27 |
| 40 | 1-1/2 | 48.3 | 1.9 | 2.77 | 0.109 | 3.11 | 2.09 | 3.68 | 0.145 | 4.05 | 2.72 |
| 50 | 2 | 60.3 | 2.38 | 2.77 | 0.109 | 3.93 | 2.64 | 3.91 | 0.154 | 5.45 | 3.66 |
| 65 | 2-1/2 | 73 | 2.88 | 3.05 | 0.12 | 5.26 | 3.53 | 5.16 | 0.203 | 8.64 | 5.8 |
| 80 | 3 | 88.9 | 3.5 | 3.05 | 0.12 | 6.46 | 4.34 | 5.49 | 0.216 | 11.29 | 7.58 |
| 90 | 3-1/2 | 101.6 | 4 | 3.05 | 0.12 | 7.41 | 4.98 | 5.74 | 0.226 | 13.58 | 9.12 |
| 100 | 4 | 114.3 | 4.5 | 3.05 | 0.12 | 8.37 | 5.62 | 6.02 | 0.237 | 16.09 | 10.8 |
| 125 | 5 | 141.3 | 5.56 | 3.4 | 0.134 | 11.58 | 7.78 | 6.55 | 0.258 | 21.79 | 14.63 |
| 150 | 6 | 168.3 | 6.63 | 3.4 | 0.134 | 13.85 | 9.3 | 7.11 | 0.28 | 28.29 | 18.99 |
| 200 | 8 | 219.1 | 8.63 | 4.78 | 0.188 | 25.26 | 16.96 | 7.04 | 0.277 | 36.82 | 24.72 |
| 250 | 10 | 273.1 | 10.75 | 4.78 | 0.188 | 31.62 | 21.23 | 7.08 | 0.307 | 51.05 | 34.27 |
| ASTM A135 (BLACK & GALVANISED) | |||||||
| N.D. | O.D. | SCH10 | SCH40 | ||||
| WALL THICKNESS | NOMINAL WEIGHT | TEST PRESSURE | WALL THICKNESS | NOMINAL WEIGHT | TEST PRESSURE | ||
| inch | mm | mm | kg/m | Mp | mm | kg/m | Mp |
| 1/2 | 21.3 | —- | —- | —- | 2.77 | 1.27 | 17.2 |
| 3/4 | 26.8 | 2.11 | 1.28 | 17.24 | 2.87 | 1.68 | 17.2 |
| 1 | 33.5 | 2.77 | 2.09 | 17.24 | 3.38 | 2.5 | 17.2 |
| 1-1/4 | 42.2 | 2.77 | 2.7 | 16.55 | 3.56 | 3.38 | 17.2 |
| 1-1/2 | 48.3 | 2.77 | 3.1 | 14.48 | 3.68 | 4.05 | 17.2 |
| 2 | 60.3 | 2.77 | 3.93 | 11.72 | 3.91 | 5.43 | 16.08 |
| 2-1/2 | 73 | 3.05 | 5.26 | 10.34 | 5.16 | 8.62 | 17.2 |
| 3 | 88.9 | 3.05 | 6.45 | 8.27 | 5.49 | 11.28 | 15.3 |
| 3-1/2 | 101.6 | 3.05 | 7.41 | 6.89 | 5.74 | 13.56 | 14 |
| 4 | 114.3 | 3.05 | 8.36 | 6.21 | 6.02 | 16.06 | 13.06 |
| 5 | 141.3 | 3.4 | 11.58 | 5.86 | 6.55 | 21.76 | 11.5 |
| 6 | 168.3 | 3.4 | 13.84 | 5.02 | 7.11 | 28.34 | 10.48 |
| 8 | 219 | 4.8 | 15.41 | 4.26 | 8.18 | 36.9 | 7.96 |
| Standards | ASTM A795 | ASTM A135 |
| Outside Diameter | ±1% of OD. | ±1% of OD. |
| Thickness Tolerances | 12.5% wall thickness. | 12.5% wall thickness. |
| Weight | ±5% of the specified weight. | ±10% of the specified weight. |
| Hydrostatic testing： | Hydro testing at pressure as per above Table and holding time Min. 5 Second. |
| NDT： | Weld seam of each pipe shall be tested by online Eddy Current test |
| Flattening Test： | Weld located 0 & 90 degree from line of direction of force. i) For ductility of weld, no cracks or breaks on the inside or outside surface at the weld , flatten up to 2/3 of outside dia of pipe. ii) For ductility of steel,no cracks or breaks on the inside or outside surface away from the weld , flatten upto 1/3 of outside dia of pipe iii) For soundness , full flattening for testing of laminated and unsound material. |
| Heat Treatment | The weld seam of the ERW Pipe in Grade B shall be heat treated after welding to a min temperature of 540° C, so that no untempred martensite remains. |
