
API 5L X56 is a specification for seamless steel pipe and welded steel pipe, primarily used for transportation of oil and gas in the petroleum industry. It belongs to the API 5L specification series, which defines standards for various grades of line pipes. X56 indicates a specific grade with a minimum yield strength of 56,000 psi (386 MPa) and a minimum tensile strength of 71,000 psi (490 MPa). The API 5L X56 carbon steel pipe undergo testing and inspection to ensure they meet the specified requirements for mechanical properties, chemical composition, and dimensional tolerances.
STANDARD OF API 5L GR.X56 seamless steel pipe
Standard |
Grade |
Chemical Composition(%) |
Tensile STrength(min) |
Yield Strength(min) |
|||
C Mn P S |
Mpa |
Mpa |
|||||
API 5L PSL1 |
A |
0.22 |
0.90 |
0.030 |
0.030 |
335 |
210 |
B |
0.28 |
1.20 |
0.030 |
0.030 |
415 |
245 |
|
X42 |
0.28 |
1.30 |
0.030 |
0.030 |
415 |
290 |
|
X46 |
0.28 |
1.40 |
0.030 |
0.030 |
435 |
320 |
|
X52 |
0.28 |
1. 40 |
0.030 |
0.030 |
460 |
360 |
|
X56 |
0.28 |
1.40 |
0.030 |
0.030 |
490 |
390 |
|
X60 |
0.28 |
1.40 |
0.030 |
0.030 |
520 |
415 |
|
X65 |
0.28 |
1.40 |
0.030 |
0.030 |
535 |
450 |
|
X70 |
0.28 |
1.40 |
0.030 |
0.030 |
570 |
485 |
|
Standard |
Grade |
Chemical Composition(%) |
Tensile STrength |
Yield Strength |
|||
C Mn P S |
Mpa |
Mpa |
|||||
API 5L PSL2 |
B |
0.24 |
1.20 |
0.025 |
0.015 |
415-655 |
245-450 |
X42 |
0.24 |
1.30 |
0.025 |
0.015 |
415-655 |
290-495 |
|
X46 |
0.24 |
1.40 |
0.025 |
0.015 |
435-655 |
320-525 |
|
X52 |
0.24 |
1. 40 |
0.025 |
0.015 |
460-760 |
360-530 |
|
X56 |
0.24 |
1. 40 |
0.025 |
0.015 |
490-760 |
390-545 |
|
X60 |
0.24 |
1. 40 |
0.025 |
0.015 |
520-760 |
415-565 |
|
X65 |
0.24 |
1.40 |
0.025 |
0.015 |
535-760 |
450-600 |
|
X70 |
0.24 |
1.40 |
0.025 |
0.015 |
570-760 |
485-635 |
|
X80 |
0.24 |
1. 40 |
0.025 |
0.015 |
625-825 |
555-705 |
DIMENSION TOLERANCES OF API 5L GR.X56 seamless steel pipe
Types |
Types |
Uses |
|
Hot rolled |
OD |
<50 |
±0.50mm |
≥50 |
±1% |
||
WT |
<4 |
±12. 5% |
|
≥4~20 |
+15%, - 12. 5% |
||
>20 |
±12. 5% |
||
Cold drawn |
OD |
6~10 |
±0. 20mm |
10~30 |
±0. 40mm |
||
30~50 |
±0. 45 |
||
>50 |
±1% |
||
WT |
≤1 |
±0. 15mm |
|
>1~3 |
+15%, - 10% |
||
>3 |
+12.5%, - 10% |
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