Standard | Cangzhou Steel Pipe & Fitting Factory

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