API 5L X52 PSL1, PSL2 steel pipe

What is API 5L X52 pipe

API 5L X52 pipe is also L360 pipe (Line Pipe in 360 Mpa yield strength).

It is a medium grade in the API 5L and ISO 3183 specifications, used for the oil and gas transportation systems in the pipeline systems.

X52 pipe pressure rating (Mechanical Strength) for seamless and ERW, LSAW types

API 5L grade X52 (L360 pipe) the yield strength minimum at 52220 Psi 360 Mpa, it’s the meaning that we call this grade in the API 5L X52 or L360. Tensile strength is 66700 Psi and 460 Mpa.

Then we have a question, is the x52 pipe pressure rating in seamless type is same with welded (ERW, LSAW) types?

The answer is: In case manufacturing type in X52 seamless steel pipe or welded (ERW and LSAW), the tensile strength and yield strength is the same.  More over, this is specified in API 5L specifications.

Higher grades of the steel line pipes means higher pressure ratings. Therefore, the bigger hydraulic test pressure would be applied for the same outer diameter and wall thickness.

In case the working conditions require bigger pressure, then you have to increase the wall thickness of the steel pipes, or use higher grades of the API.

And as a medium grade in API 5L, X52 performance is better than Grade X46, X42, and Grade B. It is a second big requirements in oil and gas pipe systems.

X52 / L390 pipe chemical composition

Under X52 seamless pipe type, API 5L Grade X52 or L360 steel line pipe chemical content is same with API 5L grade X42 or L320.

To be specified in details: Maximum content for C 0.28%, Mn 1.4%, P 0.030%, S 0.030%, V+Nb+Ti ≤ 0.15%; Copper maximum is 0.50%, nickel maximum 0.50%, chromium 0.50%, Molybdenum 0.15%.

It shall be noted that,

For grades higher or equal to X52/L360, these elements Cu, Ni, Cr shall not be added on any purpose.

And for 0.01% reduce of the specified maximum content of C, an increase of 0.05% of Mn is allowed, until maximum of 1.65%. (This rule is applied for grades equal to and higher than Grade B or L245, but lower or equal to X52 or L360)

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