TUSPIPE-LOGO-TIANJIN-UNITED-STEEL-PIPE-CO.,-LTD

API 5L X65

API-5L-X65-LINE-PIPE

API 5L X65

API 5L X65 line pipe is a petroleum and natural gas transport supply pipeline. The material for the API 5L X65 line pipe is steel grade. The pipeline is mostly used in the petroleum and oil and gas industries. With this being said, the API 5L X65 material gives the pipeline a very high resistance to crack propagation. In addition, the API 5L X65 line pipe has good weldability properties. This is because the chemistry of the API 5L X65 material is very basic. When it comes to welding, this steel grade has very good toughness levels at low temperatures. Lastly, this material also has good resistance to wear and tear. This makes the API 5l X60 line pipe perfect for use in high-pressure environments and crude oil transportation.

The American Petroleum Institute API 5L specification is for line pipes used in pipelines for transporting oil, natural gas, and water. The specification covers two types of line pipes: seamless and welded. Seamless pipes are made from a single piece of metal, while welded pipes are made by joining together pieces of metal. The specification covers a wide range of diameter sizes, from two inches to 60 inches. In addition, the specification covers several grades of pipe, from low-carbon steel to high-yield strength steel. The API 5L specification is widely used in the oil and gas industry because it provides a reliable and consistent way to transport these materials.

Why choose tuspipe?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Application of API 5L X65 Line Pipe

API 5L X65 line pipe is used in a variety of industry applications, most commonly in the petroleum and natural gas industries. It is also used for transport and supply purposes in other industries. The pipe is made from steel, and it is designed to be strong and durable. The thickness of the pipe walls varies depending on the application. For example, thicker walls are typically used for high-pressure applications. The pipes can be either welded or seamless, and they are usually cut to length before being installed. API 5L X65 line pipe is a versatile product that can be used in a variety of industries and applications.

Different Levels of API 5L X65 Line Pipe

- API 5L X65 PSL-1

API 5L X65 PSL-1 Pipe is a standard carbon steel material used in a variety of tree kinds and for general purpose applications (No corrosion environment but in high-pressure pipelines required certain mechanical properties). As a result, it has much higher concentrations of C, Mn, Si, P, and S than the other two varieties. (When the concentration of these chemical components is smaller, the steel is purer.) The minimum yield strength is 450 Mpa (65300 psi), while the minimum tensile strength is 535 Mpa (65300 psi) (77600 psi).

- API 5L X65 PSL-2

API 5L X65 PSL-2 (also known as API 5L X65Q.M or L450Q/M) has a lower value for C, Si, Mn, P, and S than API 5L X65 PSL-1. C, Si, Mn, P, and S have lower values than API 5L X65 PSL-1. Because PSL-2 needs CEq to be less than 0.43 and CEpcm to be less than 0.25. (Ceq stands for carbon equivalent, and it affects the welding ability and strength of steel.) As a result, the mechanical strength of API 5L X65 PSL-2 Pipe (welded and seamless) is limited to the following maximum values: yield strength 450 – 600 Mpa (65300 psi to 87000 psi), tensile strength 535 to 760 Mpa (65300 psi to 87000 psi) (77600 psi to 110200 psi)

- API 5L X65 Sour Service

API 5L X65 sour service pipe (X65QS/MS, L415QS/MS), C maximum is 0.10, Mn maximum is 1.45, Si maximum is 0.45, P maximum is 0.020, S maximum is 0.002, V maximum is 0.10, Nb maximum is 0.08, Ti maximum is 0.06, CEPcm maximum is 0.22. It is necessary to maintain rigorous control over the chemical composition of sour service line pipe. So, to protect the pipe from corrosive conditions such as H2S, low carbon, and low CEPcm values will lower the martensite, which is susceptible to H bubble, so improving the corrosive resistance to H2S Furthermore, P and S should be less than those of standard line pipes. The mechanical strength of these steel line pipes is the same as that of API 5L X65 PSL2 steel line pipes.

API 5L X65 Pipe Chemical Composition

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

Steel GradeMass fraction, % based on heat and product analyses a,g
CMnPSVNbTi
max bmax bmaxmaxmaxmaxmax
Welded Pipe
X650.261.450.30.3fff

a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%,
b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; and up to a maximum of 2.00% for grade L485 or X70.,
c. Unless otherwise agreed NB + V ≤ 0.06%,
d. Nb + V + TI ≤ 0.15%,
e. Unless otherwise agreed.,
f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%,
g. No deliberate addition of B is permitted and the residual B ≤ 0.001%

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

Steel GradeMass fraction, % based on heat and product analysesCarbon Equiv a
CSiMnPSVNbTiOtherCE IIWCE Pcm
max bmaxmax bmaxmaxmaxmaxmaxmaxmax
Welded Pipe
X65M0.120.451.60.0250.015gggh,l0.430.25

a. SMLS t>0.787”, CE limits shall be as agreed. The CEIIW limits applied if C > 0.12% and the CEPcm limits apply if C ≤ 0.12%,
b. For each reduction of 0.01% below the specified maximum for C, an increase of 0.05% above the specified maximum for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; up to a maximum of 2.00% for grades ≥ L485 or X70, but ≤ L555 or X80, and up to a maximum of 2.20% for grades > L555 or X80.,
c. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and MO ≤ 0.50%,
j. B ≤ 0.004%,
k. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.55%, and MO ≤ 0.80%,
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%.

API 5L X65 Pipe Mechanical Properties

- Mechanical Properties for API 5L X65 PSL-1 Pipe

Pipe GradeTensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1Seam of Welded Pipe
Yield Strength aTensile Strength aElongationTensile Strength b
Rt0,5 PSI MinRm PSI Min(in 2in Af % min)Rm PSI Min
X6565,30077,500c77,500
a. For intermediate grade, the difference between the specified minimum tensile strength and the specified minimum yield for the pipe body shall be as given for the next higher grade.
b. For the intermediate grades, the specified minimum tensile strength for the weld seam shall be the same as determined for the body using footnote a.
c. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
equation-formula
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
– For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
– For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch)

- Mechanical Properties for API 5L X65 PSL-2 Pipe

Pipe GradeTensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2Seam of Welded Pipe
Yield Strength aTensile Strength aRatio a, cElongationTensile Strength d
Rt0,5  PSI MinRm  PSI MinR10,5IRm(in 2in)Rm (psi)
Af %
MinimumMaximumMinimumMaximumMaximumMinimumMinimum
X65Q, X65M65,30087,00077,600110,2000.93f76,600
a. For intermediate grade, refer to the full API5L specification.
b. for grades > X90 refers to the full API5L specification.
c. This limit applies for pies with D> 12.750 in
d. For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using foot a.
e. for pipe requiring longitudinal testing, the maximum yield strength shall be ≤ 71,800 psi
f. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
equation-formula
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
–  For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
–  For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
   U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch
g. Lower values fo R10,5IRm may be specified by agreement
h. for grades > x90 refers to the full API5L specification.

Dimensions and Sizes of API 5L X65 Line Pipe

Before purchasing an API 5L X65 line pipe, it is important to check the diameter and wall thickness of the pipe to ensure that it meets the required standards. The diameter and wall thickness of API 5L line pipes are specified in ISO 4200 and ASME B36.10M. These standards provide a guide for different size pipes and specify the wall thickness of each size. To check if a particular pipe meets the required standards, refer to these tables. Doing so will help to ensure that the pipe is the right size and has the correct wall thickness. By checking the diameter and wall thickness of the pipe, you can be sure that it meets the required standards and will be suitable for your needs.

API-5L-LINE-PIPE-ASME-B36.10M-SIZE-CHART

API 5L X65 Pipe Tolerance

O.D. ToleranceW.T. Tolerance
X65
D < 60.3mm+0.41/-0.40mmD < 73mm+15%/-12.5%
D ≥ 60.3m+0.75/-0.40mmD ≥ 73mm+15%/-12.5%

Test and inspection of API 5L X65 Line pipes

- Hydrostatic Test

Hydrostatic testing is a key quality control step in the production of API 5L line pipes. The purpose of the hydrostatic test is to ensure that the pipe can withstand the working pressure of the intended application. The test is carried out by filling the pipe with water and then applying pressure to it. If there are any leaks, they will be evident at this stage. The weld seam is also inspected for any signs of weakness. Once the hydrostatic test is complete, the pipe body is checked for any deformities. This ensures that the finished product meets all safety and quality standards.

- Bend Test

The bending test is a destructive test performed during the production of API 5L line pipes. The test specimen is a welded steel pipe with dimensions and tolerances specified in the relevant standard. The test is conducted by applying a load to the pipe until it cracks or fails. The results of the test are used to determine the quality of the weld and the suitability of the pipe for its intended purpose.

- Flattening Test

The flattening test is a destructive test that provides information about the deformation behavior of a sample when it is subjected to an external force. The test is performed by applying a steadily increasing force to the ends of a steel pipe until the pipe deformities or fails. The results of the test are used to determine the pipe’s yield strength, elastic limit, and ductility. The flattening test is often used in conjunction with the tensile strength and hardness tests to fully characterize the properties of a steel pipe. The flattening test is typically performed on welded steel pipes, as they are more likely to experience deformation during service. The test is also useful for assessing the quality of the weld and determining the location of any potential crack formation. The deformation that occurs during the flattening test can be longitudinal or circumferential, depending on the orientation of the applied force. In most cases, both types of deformation are of interest and both are measured.

- CVN Impact Test

The impact test is a vital quality control check during the production of the API 5L line pipe. Three main areas are tested: the pipe body, the weld seam, and the heat-affected zone. The impact test ensures that the pipe can withstand any sudden external forces that it may encounter in service. This could include being struck by heavy objects or being exposed to extreme temperatures. By testing the pipe to its limits, we can be confident that it will perform as expected in even the most challenging conditions. The impact test is just one of many quality checks that are carried out on API 5L line pipe during production, ensuring that it meets the highest standards.

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