The L555 (API 5L Grade X80) is an American classification of high strength pipeline steel. The minimum yield value (MPa) is 555, namely the small yield strength of line pipe is 80,000psi (552MPa). The L555 pipeline steel has high degree, high toughness, good weldability, certain resistance to HIC and SSC, and improves the pipeline steel grade. Can save construction costs.
Chemical composition (%)
Grades |
Material |
C max |
Si max |
Mn. max |
P max |
S max |
AL min |
Mo max |
Ni max |
Nb max |
|
number |
||||||||||
|
L555 |
1.8978 |
0.08 |
0.26 |
1.75 |
0.011 |
0.0005 |
0.03 |
0.27 |
0.22 |
0.07 |
Mechanical properties
Grade |
Permissible yield point ratio |
Yield Strength MPa(min) |
Tensile Strength MPa |
Elongation % (min) |
|
L555 |
= 0.90 |
555 |
625 – 700 |
20 |
L555 pipeline steel is mainly used in oil and gas pipelines.
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