API 5L X65 line pipe application range

Feb 04, 2024

API 5L X65 line pipe application range

API 5L X65 line pipe is designed to be the most economical and safest method of transporting oil and natural gas. A significant proportion of accidents caused by pipeline failures are due to corrosion. Plastic deformation can change the mechanical properties of these pipes, and the corrosion behavior of the steel during plastic deformation is important to avoid failure.

The meaning of API 5L X65 Q PSL2 level:

X65 Minimum Yield Strength: 450 MPa (65,300 psi) at pipe body

Q-Delivery conditions: +N normalizing rolling + Q quenching and tempering; Q refers to the heat treatment process of quenching + tempering

Psl: PSL refers to the product specification level, where PSL2 offers a wider range of chemical compositions and has a mandatory minimum fracture toughness.

Delivery condition for API 5L X65 Line Pipe

PSL	Delivery Condition	Pipe grade
PSL1	As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered	X42, X46, X52, X56, X60, X65, X70
PSL 2	Quenched and tempered	BQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q
	Thermomechanical rolled or thermomechanical formed	BM, X42M, X46M, X56M, X60M, X65M, X70M, X80M

Chemical Composition for API 5L X65 PSL 1 pipe with t ≤ 0.984”

Steel Grade	Mass fraction, % based on heat and product analyses a,g
	C	Mn	P	S	V	Nb	Ti
	max b	max b	max	max	max	max	max
Seamless Pipe
X65	0.28 e	1.40 e	0.3	0.3	f	f	f
Welded Pipe
X65	0.26 e	1.45 e	0.3	0.3	f	f	f
f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%,

Chemical Composition for API 5L X65 PSL 2 pipe with t ≤ 0.984”

Steel Grade	Mass fraction, % based on heat and product analyses																		Carbon Equiv a
	C		Si		Mn		P		S		V		Nb		Ti		Other		CE IIW		CE Pcm
	max b		max		max b		max		max		max		max		max		Other		max		max
Seamless and Welded Pipe
X65Q	0.18f		0.45f		1.70f		0.025		0.015		g		g		g		h,l		0.043		0.25
Welded Pipe
X65M		0.12f		0.45f		1.60f		0.025		0.015		g		g		g		h,l		0.043	0.25
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%, l. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001% .

Mechanical properties for API 5L X65

Pipe Grade	Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1			Seam of Welded Pipe
	Yield Strength a	Tensile Strength a	Elongation	Tensile Strength b
	Rt0,5 PSI Min	Rm PSI Min	(in 2in Af % min)	Rm PSI Min
X65	65,300	77,500	c	77,500
c. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:

Pipe Grade	Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2						Seam of Welded Pipe
	Yield Strength a		Tensile Strength a		Ratio a,c	Elongation	Tensile Strength d
	Rt0,5 PSI Min		Rm PSI Min		R10,5IRm	(in 2in)	Rm (psi)
						Af %
	Minimum	Maximum	Minimum	Maximum	Maximum	Minimum	Minimum
X65Q,X65M	65,300	87,000	77,600	110,200	0.93	f	76,600
f. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:

Bend test

No cracks shall occur in any portion of the test piece and no opening of the weld shall occur.

Flattening test

Acceptance criteria for flattening test shall be:

EW pipes D<12.750 in:

X60 with T 500in. There shall be no opening of the weld before the distance between the plates is less than 66% of the original outside diameter. For all grades and wall, 50%.

For pipe with a D/t > 10, there shall be no opening of the weld before the distance between the plates is less than 30% of the original outside diameter.

For other sizes refer to the full API 5L specification.

CVN impact test for PSL2

Many PSL2 pipe sizes and grades require CVN. Seamless pipe is to be tested in the body. Welded pipe is to be tested in the body, pipe weld and heat-affected zone. Refer to the full API 5L specification for the chart of sizes and grades and required absorbed energy values.

Surface

All surfaces have been 100% visually inspected. The surface condition complies with API 5L Annex E.

External surface of pipe shall be coated with a layer of varnish.

NDT

All pipes will be ultrasonic tested on pipe body and pipe end as per API 5L Annex E, Table E.2 and para E.3.3.

Coverage:

longitudinal: 100% of the pipe surface

pipe ends not scanned by automatic ultrasonic system shall be inspected by manual UT or Magnetic Particle Examination.

Hydrostatic test

Test pressure may not exceed 2970 psi in accordance to API 5L requirements

Holding time: minimum 5 seconds

Certification and traceability

All dimensions will be supplied with a 3.2 certificate according to EN 10204, endorsed by recognized and independent inspection agency. Marking shall be in SI units (X65) accordance with API requirements & mill standard.

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