What is API X65 line pipe
API X65 pipe is a pipeline steel pipe that conforms to the American Petroleum Institute standard (API SPEC 5L), which is a widely used pipe in the oil and gas industry.Manufacturers of X65 pipe will produce the pipe in accordance with the API standards, which include requirements such as the mechanical properties of the pipe, its chemical composition, and the tolerances of the outside diameter and wall thickness.
Property
Tensile strength: at least 535 MPa
Yield strength: at least 450 MPa
Elongation: at least 19 per cent
Chemical composition
Carbon: not more than 0.16 per cent
Manganese: not more than 1.60 per cent
Phosphorus: not more than 0.020 per cent
Sulphur: not more than 0.010 per cent
Dimensional tolerances
Outside diameter: Tolerances vary according to size and are usually ±1.00% or better.
Wall Thickness: Tolerances may be +12.5% or -15.0% depending on wall thickness and outside diameter as specified in ASTM A53/A53M.
