API 5L Grade X52 pipes have superior mechanical strength with a minimum yield strength of about 360 MPA. These grade pipes are superior to API 5L Grade B, API 5L Grade X42 and API 5L Grade X46 pipe concerning chemical and mechanical properties.
The main differences between API 5L level B and X52 level are as follows:
The yield strength is different. The yield strength of API 5L grade B is 241MPa; the yield strength of grade X52 is 360MPa.
The uses are different. API 5L B-grade steel pipes are mainly used in pipeline systems for transporting oil, natural gas and other fluids; X52-grade steel pipes are widely used in chemical pipelines, water supply and drainage projects, power transmission, construction industries and other fields.
Chemical Composition of API 5L X52 PSL1 Pipes with t ≤ 0.984"
| Steel Grade | Mass fraction, % based on heat and product analyses a,g | ||||||
|---|---|---|---|---|---|---|---|
| C | Mn | P | S | V | Nb | Ti | |
| max b | max b | max | max | max | max | max | |
|
Seamless Pipe |
|||||||
| X52 | 0.28 | 1.4 | 0.3 | 0.3 | d | d | d |
|
Welded Pipe |
|||||||
| X52 | 0.26 | 1.4 | 0.3 | 0.3 | d | d | d |
| a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%, b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; and up to a maximum of 2.00% for grade L485 or X70., c. Unless otherwise agreed NB + V ≤ 0.06%, d. Nb + V + TI ≤ 0.15%, e. Unless otherwise agreed., f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%, g. No deliberate addition of B is permitted and the residual B ≤ 0.001% |
|||||||
