1. Standard
American Standard：API 5LD
2. Chemical Composition
X52 Chemical Composition，%
| C | Si | Mn | P | S | V | |
| min | 0.2 | 1.0 | 0.05 | |||
| max | 0.15 | 0.6 | 1.65 | 0.035 | 0.035 | 0.12 |
| Actual value | 0.12 | 0.46 | 1.62 | 0.019 | 0.007 | 0.07 |
N08825 Chemical Composition，%
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | Ti | Al | Fe | |
| Min | 19.5 | 38.0 | 2.5 | 1.5 | 0.6 | 22 | ||||||
| Max | 0.05 | 0.5 | 1.0 | 0.020 | 0.020 | 23.5 | 46.0 | 3.5 | 3.0 | 1.2 | 0.2 | |
| Actual value | 0.02 | 0.38 | 0.35 | 0.015 | 0.006 | 19.9 | 42.2 | 2.82 | 1.76 | 0.84 | 0.03 | 31.67 |
3. Mechanical properties
X52
| Mechanical Properties |
Tensile Strength MPa |
Yield Strength MPa |
Hardness HBW |
IMPact AKv （longitudinal） （-20℃） J |
Elongation （longitudinal） % |
Grain Size |
| Min（Requirements） | 460 | 360 | 70 | 23 | 8 | |
| Max（Requirements） | 760 | 530 | 220 | |||
| Actual value | 608 | 454 | 187 | 176 | 36 | 9.5 |
4. Typical Size
| Size | Size and Tolerance（mm） | |
| Φ114.3*（16+3） | Pipe Body Outer Diameter | The outer diameter shall be determined according to the inner diameter, the thickness of the wall and the deviation of the pipeline. |
| Pipe Body Inner Diameter | ±0.75d（d—Inner Diameter） | |
| Base Material Thickness | -10% ~ 15% | |
| CRA Layer Thickness | 0 ~ 2mm | |
5.Typical Application Environment
It is mainly used for process pipeline in acid gas field and chemical pipeline