API 5L Line Pipe Steels
General Description
API 5L Line pipes are used for conveying gas, water, oil, and other liquefied media to the oil refinery or gas plant. There are two categories of pipes: seamless and welded.
The yield strength of an API 5L pipe is specified with the number that follows the X in the material grade designation (in kilopounds per square inch – i.e. KSI). So, for instance, an API 5L X52 pipe has a minimum yield strength of 52 KSI. The specific grades include Gr. B, X42, X46, X52, X56, X60, X65, X70, X80.
CHEMICAL
AND
MECHANICAL PROPERTIES
The
table shows the chemical
composition of API 5L steel pipes PSL1 and PSL2 from Grade A to Grade X70, as
well as their mechanical properties. (Source: API 5L
specification)
|
API 5L PIPE PSL1 Chemical
and Mechanical Properties
|
|
API 5L PIPE PSL1
|
Chemical Composition
|
Mechanical Property
|
|
C (Max)
|
Mn (Max)
|
P (Max)
|
S (Max)
|
TENSILE ( Min )
|
YIELD ( Min )
|
|
Psi X 1000
|
Mpa
|
Psi X 1000
|
Mpa
|
|
Grade A25
|
CL I
|
0.21
|
0.60
|
0.030
|
0.030
|
45
|
310
|
25
|
172
|
|
CL II
|
0.21
|
0.60
|
0.030
|
0.030
|
|
Grade A
|
0.22
|
0.90
|
0.030
|
0.030
|
48
|
331
|
30
|
207
|
|
Grade B
|
0.26
|
1.20
|
0.030
|
0.030
|
60
|
414
|
35
|
241
|
|
Grade X42
|
0.26
|
1.30
|
0.030
|
0.030
|
60
|
414
|
42
|
290
|
|
Grade X46
|
0.26
|
1.40
|
0.030
|
0.030
|
63
|
434
|
46
|
317
|
|
Grade X52
|
0.26
|
1.40
|
0.030
|
0.030
|
66
|
455
|
52
|
359
|
|
Grade X56
|
0.26
|
1.40
|
0.030
|
0.030
|
71
|
490
|
56
|
386
|
|
Grade X60
|
0.26
|
1.40
|
0.030
|
0.030
|
75
|
517
|
60
|
414
|
|
Grade X65
|
0.26
|
1.45
|
0.030
|
0.030
|
77
|
531
|
65
|
448
|
|
Grade X70
|
0.26
|
1.65
|
0.030
|
0.030
|
82
|
565
|
70
|
483
|
|
API 5L PIPE PSL2 Chemical and Mechanical Properties
|
|
API 5L PIPE
PSL2
|
Chemical Composition
|
Mechanical Property
|
|
C
(Max)
|
Mn
(Max)
|
P
(Max)
|
S
(Max)
|
Tensile
|
Yield
|
C. E. IMPACT ENERGY
|
|
Psi x 1000
|
Mpa
|
Psi x 1000
|
Mpa
|
PCM
|
IIW
|
J
|
FT/LB
|
|
Grade B
|
0.22
|
1.20
|
0.025
|
0.015
|
60 – 110
|
414 – 758
|
35 – 65
|
241 – 448
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X42
|
0.22
|
1.30
|
0.025
|
0.015
|
60 – 110
|
414 – 758
|
42 – 72
|
290 – 496
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X46
|
0.22
|
1.40
|
0.025
|
0.015
|
63 – 110
|
434 – 758
|
46 – 76
|
317 – 524
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X52
|
0.22
|
1.40
|
0.025
|
0.015
|
66 – 110
|
455 – 758
|
52 – 77
|
359 – 531
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X56
|
0.22
|
1.40
|
0.025
|
0.015
|
71 – 110
|
490 – 758
|
56 – 79
|
386 – 544
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X60
|
0.22
|
1.40
|
0.025
|
0.015
|
75 – 110
|
517 – 758
|
60 – 82
|
414 – 565
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X65
|
0.22
|
1.45
|
0.025
|
0.015
|
77 – 110
|
531 – 758
|
65 – 82
|
448 – 565
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X70
|
0.22
|
1.65
|
0.025
|
0.015
|
82 – 110
|
565 – 758
|
70 – 82
|
483 – 565
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
|
Grade X80
|
0.22
|
1.90
|
0.025
|
0.015
|
90 – 120
|
621 – 827
|
80 – 102
|
552 – 705
|
0.25
|
0.43
|
T/L 27/41
|
T/L 20/30
|
API
5L PSL1 VS.
API 5L PSL2
API
5L PSL1 and PSL2 are two
specification levels that differ in terms of chemical composition and test
requirements. The differences between PSL1 and PSL2 are outlined in the two
tables below:
|
PSL GRADE
|
C, a
|
Mn a
|
P
|
S
|
Si
|
V
|
Nb
|
Ti
|
Other
|
CEIIW
|
CEpcm
|
|
1
|
0.24
|
1.40
|
0.025
|
0.015
|
0.45
|
0.10
|
0.05
|
0.04
|
b,c
|
.043
|
0.025
|
|
2
|
0.28
|
1.40
|
0.03
|
0.03
|
–
|
b
|
b
|
b
|
–
|
–
|
–
|
|
Test Requirement
|
API 5L PSL1
|
API 5L PSL2
|
|
Charpy test
|
None required
|
Required for all grades
|
|
Seamless NDT test
|
Only if purchaser specifies SR4
|
SR4 mandatory
|
|
Certification
|
Certificates when specified per
SR15
|
Certificates (SR 15.1)
mandatory
|
|
Traceability
|
Traceable only until all tests
are passed, unless SR15 is specified
|
Traceable after completion of
tests (SR 15.2) mandatory
|
|
Hydrostatic Test
|
Required
|
Required
|
API
5L PIPE
WALL THICKNESS TOLERANCE (WT)
|
API 5L wall thickness t
mm
(in)
|
API 5L Pipes Tolerances
mm (in) mm
(in)
|
|
API 5L SMLS pipe
|
|
≤ 4,0 ( 0.157)
|
+ 0,6 (0.024)
– 0,5 (0.020)
|
|
> 4,0 ( 0.157) to < 25,0 (0.984)
|
+ 0,150
– 0,125
|
|
≥ 25,0 (0.984)
|
+3,7 (0.146) or + 0,1 t whichever is the
greater
– 3,0 (0.120) or – 0,1 t whichever is the greater
|
|
API 5L Welded pipe
|
|
≤ 5,0 (0.197)
|
± 0,5 (0.020)
|
|
> 5,0 (0.197) to <15,0 (0.591 )
|
± 0, 1 t
|
|
≥ 15,0 (0.591)
|
±1,5
(0.060)
|
