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X80 steel


API 5L X80 steel plate/pipes is one mainly of Steel for large diameter pipes. API 5L X80 steel plate/pipes with good low temperature toughness was developed and the buckling behavior ofAPI 5L X80 steel plate/pipeswas investigated through large scale deformation tester. X80 is a grade of steel for large diameter pipes under America. The minimum tensile strength is 551 MPa.


X80 API5L Material#1.8978 Comparison of steel grades
 EN10208-2     L555MB

  Chemical analysis -% by  mass*

Grades Material
C max Si max Mn. max P max S max AL min Mo max Ni max Nb max
X80 1.8978 0.08 0.26 1.75 0.011 0.0005 0.03 0.27 0.22 0.070

Mechanical Propertities

 Grade  Permissible yield
 point  ratio 
 Yield Strength
 Tensile Strength
% (min)
 X80   ≤ 0.90     555  625 - 700     20