API SPEC 5L Standard Specification for Line Pipe
API SPEC 5L is a international standard specifies technical requirements for line pipe expressed as two products specification levels (PSL 1 and PSL 2). Level PSL 1 provides a standard quality level for line pipe. Level PSL 2 has additional mandatory requirements for chemical composition, notch toughness and strength properties and additional NDT. Line Pipe is used to transport oil, gas and water pulled out of ground to the oil and gas industrial enterprise. Line pipe is divided into seamless and welded pipes. It has plain ends, thread ends and socket ends. Its connection type has end welding, connect with coupling, socked weld, etc.
Main materials:
L245、L290、L360、L415、L480、GR.B、X42、X46、X56、X65、X70、X80、X100
Chemical composition:
| roduct Level | Steel grade | Chemical composition, % | ||||||||
| C | Mn | P | S | Si | V | Nb | Ti | CEpcm | ||
| PSL 1 | B or L245 | ≤0.28 | ≤1.20 | ≤0.030 | ≤0.030 | – | – | – | – | – |
| x42 or L290 | ≤0.28 | ≤1.30 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| X46 or L320 | ≤0.28 | ≤1.40 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| X52 or L360 | ≤0.28 | ≤1.40 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| X56 or L390 | ≤0.28 | ≤1.40 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| X60 or L415 | ≤0.28 | ≤1.40 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| X70 | ≤0.28 | ≤1.40 | ≤0.030 | ≤0.030 | – | – | – | – | – | |
| PSL 2 | BR or L245R | ≤0.24 | ≤1.20 | ≤0.025 | ≤0.015 | ≤0.40 | c | c | ≤0.04 | ≤0.25 |
| X42R or L290R | ≤0.24 | ≤1.20 | ≤0.025 | ≤0.015 | ≤0.40 | ≤0.06 | ≤0.05 | ≤0.04 | ≤0.25 | |
| BN or L245N | ≤0.24 | ≤1.20 | ≤0.025 | ≤0.015 | ≤0.40 | c | c | ≤0.04 | ≤0.25 | |
| X42N or L290N | ≤0.24 | ≤1.30 | ≤0.025 | ≤0.015 | ≤0.40 | ≤0.06 | ≤0.05 | ≤0.04 | ≤0.25 | |
| X46N or L320N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.40 | ≤0.07 | ≤0.05 | ≤0.04 | ≤0.25 | |
| X52N or L360N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | ≤0.25 | |
| X56N or L390N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | ≤0.25 | |
| X60N or L415N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | – | |
| X65N or L450N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | – | |
| X70N | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | – | |
| X80 | ≤0.24 | ≤1.40 | ≤0.025 | ≤0.015 | ≤0.45 | ≤0.10 | ≤0.05 | ≤0.04 | – | |
Mechanical properties:
| Standard | Product Level | Steel grade | Yield Strength (min), Mpa | Tensile Strength（MPa） |
| API 5L GB/T9711.2 | PSL 1 | A or L210 | 210 | 335 |
| B or L245 | 245 | 415 | ||
| x42 or L290 | 290 | 415 | ||
| X46 or L320 | 320 | 435 | ||
| X52 or L360 | 360 | 460 | ||
| X56 or L390 | 390 | 490 | ||
| X60 or L415 | 415 | 520 | ||
| X70 | 483 | 565 | ||
| PSL 2 | BR or L245R | 245~450 | 415~760 | |
| X42R or L290R | 290~495 | 415~760 | ||
| BN or L245N | 245~450 | 415~760 | ||
| X42N or L290N | 290~495 | 415~760 | ||
| X46N or L320N | 320~525 | 435~760 | ||
| X52N or L360N | 360~530 | 460~760 | ||
| X56N or L390N | 390~545 | 490~760 | ||
| X60N or L415N | 415~565 | 520~760 | ||
| X65N or L450N | 425~566 | 525~760 | ||
| X70 or L480 | 484~565 | 565~768 | ||
| X80 | 552~690 | 621~827 |