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API 5L X65 Pipe

One of the most popular pipes is the API 5L X65 Carbon Steel, on account of its low alloying cost due to the use of only 2 materials i.e. carbon and iron. Usually, API 5L X65m made from carbon steel have a hard and tough disposition. And the higher content of carbon version of the API 5L Grade X65q gives it much better heat resisting properties. Although most of the properties of the API 5L Grade X65q tend to remain similar, depending on the technique used to produce these pipes, there are small changes advised by many manufacturers. For instance, in the API 5L X65 Dsaw Pipe, submerged welding is performed both inside as well as outside the pipes. This kind of welding process conducted on the API 5L Grade X65 PSL2 protects the carbon steel from getting contaminated by impurities in the air.

API 5L X65 Pipe

Moreover, any pipe that uses welding as a method for joining such as the API 5L X65 Erw is advised to have a reduced content of carbon to facilitate successful welding operations. While the API 5L X65 Seamless Pipes if produced by cold drawing has a much better dimensional stability and a smoother surface. But if these pipes were to be produced from the API 5L X65 Material via hot forming, the corrosion resistance would be much better. Since the API 5L X65 PSL2 has stricter policies regarding not only its chemistry, but also mechanical properties and testing parameters, the API 5L X65 Pipe is well suited to be used for applications involving high pressure such as Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Hydrocarbon Industries & Refineries along with Bearings, Boilers and Automobiles.

API 5L X65 Pipe Specification Format

Pipe Type ERW LSAW SSAW
Range of Sizes 1/2” NB – 60” NB
ERW 1/2” NB – 24” NB
Pipe End Plain end, Bevel end
Wall Thick. SCH20, SCH30,SCH10, STD, SCHXS, SCH80, SCH100, SCH40, SCH60, SCH120, SCH140, SCH160, XXS DIN, JIS
LSAW / DSAW 16’OD TO 54′ OD (8 MM TO 50 MM THK)
Standard API, ASTM, ISO 3183, ASME
SAW 16” NB – 100” NB
PSL Level
  • X65 PSL 1
  • X65 PSL 2
Test HIC / SSC TEST, NACE MR0175 / TM0177 / TM0284, H2 SERVICE, IBR etc.

Check out X65 pipe

Grade X65 pipe is one of the premium class material and it has two specification levels of PSL1 and PSL2. Minimum tensile strength of X65 PSL1 pipe is 535 Mpa.

Wall Thickness Chart of X65 Seamless Pipes

Wall Thk. ERW 2.11mm-24.61mm
LSAW 8mm-50mm
SSAW 6mm-25.4mm

API 5L X65 Pipe Composition Standard

Grade Composition, %
C max Mn max P S max V max Nb max Ti max
min max
B 0.28 1.2 0.03 0.03 c.d c,d d
X65 0.28 1.4 0.03 0.03 f f f

Mechanical Strength of API 5L Grade X65 ERW Pipe

Material Equivalent of API 5L X65 Carbon Steel Pipe

ASTM API 5L Product Specification Level of line pipe
Material Grade PSL1 L450 or x65
Material Grade PSL2 L450Q or X65Q
L450M or X65M

Yield Strength of API 5L X65 pipe

Grade Yield Strength Tensile Strength Yield to Tensile Elongation
min. (KSI) min. (KSI) Ratio (max) %
API 5L X65 Pipe 65 77 0.93 18
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