The main production processes of large-diameter seamless steel pipes are hot-rolled large-diameter seamless steel pipes and heat-expanded-diameter seamless steel pipes. The maximum specification of hot-expanded seamless steel pipes is 325mm-1220mm and the thickest is 200mm. It is used for steel pipes with relatively low density but strong shrinkage. A waste tube finish rolling process in which the diameter of the tube is enlarged by the cross-rolling method or the drawing method. In a relatively short period of time, thickening steel pipes can produce non-standard and special types of seamless pipes, with low cost and high production efficiency, which is the development trend of the international pipe rolling field.
| Size | Out diameter: 325mm~1220mm. |
| Wall Thickness | 1mm~200mm. |
| Length | 1m~12m or customize. |
| Standard & Grade | ASME, ASTM, API, EN, DNV, etc. |
| Ends | Plain End,Bevel End,Square Cut. |
| Payment | Payment: TT, LC, OA, D/P. |
|
Standard |
Grade |
Chemical Components (%) |
Mechanical Properties |
|||||
| ASTM A53 | C | Si | Mn | P | S | Tensile STrength(Mpa) | Yield STrength(Mpa) | |
| A | ≤0.25 | - | ≤0.95 | ≤0.05 | ≤0.06 | ≥330 | ≥205 | |
| B | ≤0.30 | - | ≤1.2 | ≤0.05 | ≤0.06 | ≥415 | ≥240 | |
| ASTM A106 | A | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥415 | ≥240 |
| B | ≤0.35 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥485 | ≥275 | |
| ASTM SA179 | A179 | 0.06-0.18 | - | 0.27-0.63 | ≤0.035 | ≤0.035 | ≥325 | ≥180 |
| ASTM SA192 | A192 | 0.06-0.18 | ≤0.25 | 0.27-0.63 | ≤0.035 | ≤0.035 | ≥325 | ≥180 |
| API 5L PSL1 | A | 0.22 | - | 0.90 | 0.030 | 0.030 | ≥331 | ≥207 |
| B | 0.28 | - | 1.20 | 0.030 | 0.030 | ≥414 | ≥241 | |
| X42 | 0.28 | - | 1.30 | 0.030 | 0.030 | ≥414 | ≥290 | |
| X46 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥434 | ≥317 | |
| X52 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥455 | ≥359 | |
| X56 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥490 | ≥386 | |
| X60 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥517 | ≥448 | |
| X65 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥531 | ≥448 | |
| X70 | 0.28 | - | 1.40 | 0.030 | 0.030 | ≥565 | ≥483 | |
| API 5L PSL2 | B | 0.24 | - | 1.20 | 0.025 | 0.015 | ≥414 | ≥241 |
| X42 | 0.24 | - | 1.30 | 0.025 | 0.015 | ≥414 | ≥290 | |
| X46 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥434 | ≥317 | |
| X52 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥455 | ≥359 | |
| X56 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥490 | ≥386 | |
| X60 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥517 | ≥414 | |
| X65 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥531 | ≥448 | |
| X70 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥565 | ≥483 | |
| X80 | 0.24 | - | 1.40 | 0.025 | 0.015 | ≥621 | ≥552 | |