API 5L pipeline steel pipe
Steel grade: L360 or X52 (PSL1)
Chemical composition requirements:
C: ≤0.28(seamless) ≤0.26(welded)
Mn: ≤1.40
P: ≤0.030
S: ≤0.030
Cu: 0.50 or less
Ni: ≤0.50
Cr: ≤0.50
Mo: ≤0.15
*V+Nb+Ti: ≤0.15
* Manganese content can be increased by 0.05% for every 0.01% reduction in carbon content, up to a maximum of 1.65%
Mechanical properties requirements:
Yield strength: ≥360Mpa
Tensile strength: ≥460Mpa
Weld tensile strength of welded steel pipe: ≥460Mpa
Elongation: ≥1940* AXC0.2/4600.9 , where AXC is the cross-sectional area of the tensile sample
Outer diameter tolerance of steel pipe:
| Outer diameter D mm | End outside diameter deviation mm | |
| Seamless steel pipe | Welded steel pipe | |
| < 60.3 | -0.8, +0.4 | |
| 60.3 D or less 168.3 or less | -0.4, +1.6 | |
| 168.3 < D≤610 | ±0.005D, but maximum ±1.6 | |
| 610 < D≤1422 | + / - 2.0 | + / - 1.6 |
| > 1422 | By agreement | |
Wall thickness tolerance of steel pipe:
| Wall thickness t mm | Tolerance mm |
| Seamless steel pipe | |
| 4.0 or less | +0.6, -0.5 |
| 4 < t < 25 | +0.150t, -0.125t |
| 25 or higher | +3.7 or +0.1t, whichever is larger -3.0 or -0.1t, take larger |
| Welded tube | |
| 5.0 or less | + / - 0.5 | |
| 5.0 | < t < 15 | Plus or minus 0.1 t |
| 15 | or more | + / - 1.5 |
Steel grade: L360N or X52N (PSL2)
Chemical composition requirements:
C: ≤0.24
Si: ≤0.45
Mn: ≤1.40
P: ≤0.025
S: ≤0.015
V: ≤0.10
Nb: ≤0.05
Ti: ≤0.04
Cu: ≤0.50
Ni: ≤0.30
Cr: ≤0.30
Mo: ≤0.15
V+Nb+Ti: ≤0.15
* Manganese content can be increased by 0.05% for every 0.01% reduction in carbon content, up to a maximum of 1.65%.
* No intentional addition of boron is allowed, residual B≤0.001%
Carbon equivalent :
CEP cm : ≤0.25
CEIIW : ≤0.43
* Use CE when the carbon content is greater than 0.12%, and use CE IIW whenP cm the carbon content is less than or equal to 0.12%.
CEP cm = C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B
If the result of the smelting analysis of B is less than 0.0005%, then there is no need to include the analysis of element B in the product analysis, and the B content can be treated as zero in the carbon equivalent CEP cm calculation.
CEIIW =C+Mn/6 (C+Mo+V)/5+(Ni+Cu)/ 15
Mechanical properties requirements:
Yield strength: 360-530Mpa
Tensile strength: 460-760Mpa
Yield ratio: ≤0.93 (only applicable to D > 323.9mm steel pipe)
Weld tensile strength of welded steel pipe: ≥460Mpa
Minimum elongation: = 1940* AXC0.2/4600.9 , where AXC is the cross-sectional area of the tensile sample.
CVN impact test of tube
Test temperature 0 。C
| Specify an outside diameter of D mm | Full size CVNAbsorbed energy KVJ |
| 508 or less | 27 |
| > 508 to 762 | 27 |
| > 762 to 914 | 40 |
| > 914 to 1219 | 40 |
| > 1219 to 1422 | 40 |
| > 1422 to 2134 | 40 |
Outer diameter tolerance of steel pipe:
| Outer diameter D mm | End outside diameter deviation | |
| Seamless steel pipe | Welded steel pipe | |
| < 60.3 | -0.4, +0.8 | |
| 60.3 D or less 168.3 or less | -0.4, +1.6 | |
| 168.3 < D=610 | ±0.005D, but maximum ±1.6 | |
| 610 < D=1422 | + / - 2.0 | + / - 1.6 |
| > 1422 | By agreement | |
Wall thickness tolerance of steel pipe:
| Wall thickness t mm | Tolerances |
| Seamless steel pipe | |
| 4.0 or less | +0.6, -0.5 |
| 4 < t < 25 | +0.150t, -0.125t |
| 25 or higher | +3.7 or +0.1t, whichever is larger
-3.0 or -0.1t, take larger |
| Welded pipe | |
| 5.0 or less | + / - 0.5 |
| 5.0 < t < 15 | Plus or minus 0.1 t |
| 15 or more | + / - 1.5 |
Post time: Sep-26-2023
