High yield carbon steel API 5L PSL2 X60QS line pipes are mainly used in conveying products such as oil or gas from offshore plants to refineries, especially in the petroleum and the hydrocarbon and natural gas industries. Both the PSL 1 and 2 are specs that cover seamless as well as welded steel line pipe from grades X42 through X80. The numbers after the ‘X’ indicate the pipe's minimum yield strength that is produced in PSI terms. For API 5L X60 seamless pipes and welded pipes, the minimum yield strength is 60,200 psi. In conversion to Mpa, the yield strength of these API 5L X60 ERW pipes can be about 415 Mpa. Hence these carbon steel pipes are often referred to as L415 pipes.
In order to make the X60 line pipes material resilient to crack propagation, these pipes are often coated. Unlike the PSL1, most API 5L X60 Pipe Suppliers note that the PSL 2 is a standard which is much stricter in comparison to PSL1. For instance, API 5L PSL2 X60QS line pipes also have additional testing requirements, which are inclusive of non-destructive inspection of seamless products, CVN testing along with certification to SR15, as well as mandatory trace-ability throughout the entire production process.
API 5L PSL2 X60QS line pipe specification
| Standard |
Specification for Line Pipe(ANSI/API specification 5L - 44th Edition, October 1, 2007) |
| Line pipe sizes |
Nominal Pipe Size 1/2" to 48 " O.D. |
| Wall thickness |
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XS, SCH XXS, All API 5L X60QS Pipe Thickness available |
| Pipe ends |
Plain, Bevel, Screwed, Threaded l245 pipe |
| Manufacturing types |
Seamless / ERW / Welded / Fabricated / CDW |
| Application & uses |
Conveying gas, water, oil, and other liquids |
The technical data of API 5L PSL2 X60QS line pipeIt is given based on API Spec 5L-2007 version. Below are the chemical composition and mechanical properties of seamless type and welded type API 5L PSL2 line pipe.
Chemical composition(a, %) of API 5L PSL2 X60QS steel pipe
| C max. |
Si max. |
Mn max. |
P max. |
S max. |
V max. |
Nb max. |
Ti max. |
Other |
| 0.16 |
0.45 |
1.65 |
0.020 |
0.003 |
0.08 |
0.05 |
0.04 |
g,i,j |
g, Nb+V+Ti≤0.15;
i, If agreed, Mo≤0.35;
j, If agreed, Cr≤0.45.
Mechanical properties of of API 5L PSL2 X60QS steel pipe
| Pipe grade |
Yield Strength, Rt0.5 (MPa) |
Tensile Strength, Rm(MPa) |
Ratio Rt0.5/Rm max. |
| L415QS or X60QS |
415 to 565 |
520 to 760 |
0.93 |
API 5L PSL2 X60QS steel pipe acceptable delivery condition API 5L PSL2 X60QS line pipes are delivered in quenched and tempered (Q) state.
Available pipe tests for API 5L PSL2 X60QS line pipeChemical composition analysis(product analysis)
Tensile tests
Hydro-static test
Bend test
Flattening test
CVN impact test for PSL2 line pipe
MT magnetic particle testing
NDT non-destructive testing
API 5L PSL2 X60QS steel pipe is available in seamless pipe and welded pipe, mainly used for pipeline transportation systems in the petroleum and natural gas industries. API 5L PSL2 X60QS line pipe is suitable for oil and gas transmission, structural application, and mechanical components.
