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  • Cangzhou Steel Pipe Group (CSPG) Co., Ltd.
  • ADD:No.92 Jiefang East Rd., Cangzhou City, Hebei Province, China
  • TEL:+86-31-75673271
  • MOBILE:+8615373302068
  • E-MAIL:ella@cnspipe.com
  • API 5L X52 Spiral Welded Pipe

    API 5L is the implementation standard of steel pipe for pipeline transportation system and specification for line pipe. So how much do you know about API 5L pipe and why it is getting so popular and important in pipeline industries? Here we will do a brief introduction of API 5L pipe and related...
    Product Details:

    Product Name:

    Api 5l X42 X60 X65 X70 X52 800mm Large Diameter Ssaw Carbon Spiral Welded Steel Pipe/Lsaw/ssaw Spiral Welded Steel Pipe




    Wall Thickness

    SCH30,SCH40,STD,XS,SCH80,SCH160,XXS etc.



    Steel material

    Q195 → Grade B, SS330,SPHC, S185
    Q215 → Grade C,CS Type B,SS330, SPHC
    Q235 → Grade D,SS400,S235JR,S235JO,S235J2


    JIS A5525, DIN 10208, ASTM A252, GB9711.1-1997


    USed For Structure, Accessorize And Construction



    End protector

    1) Plastic pipe cap
    2) Iron protector

    Surface Treatment

    1) Bared
    2) Black Painted (varnish coating)
    3) With Oiled
    4) 3 PE, FBE


    Electronic Resistance Welded (ERW )
    Electronic Fusion Welded (EFW)
    Double Submerged Arc Welded (DSAW)



    Welded Line Type



    With Hydraulic Testing, Eddy Current, Infrared Test

    Section Shape



    1) Bundle,
    2) In Bulk,
    3) Clients' Requirements


    1) Container
    2) Bulk carrier

    API  5L is the implementation standard of steel pipe for pipeline transportation system and specification for line pipe. So how much do you know about API 5L pipe and why it is getting so popular and important in pipeline industries?

    Here we will do a brief introduction of API 5L pipe and related standard specifications with below aspects:

    Standard Scope

    Manufacturing types

    Different Grades (Covers B, X42, X46, X52, X60, X65, X70)

    Delivery condition (R, N, Q, M means)

    Product Specification Level (PSL1 and PSL2)

    Material specifications (Chemical and Mechanical)

    Test Mehtods

    Tolerances on pipe diameters, wall thickness,  out-of-roundness

    Common defects

    Line pipe history and milestones


    API 5L pipe  standard scope

    In API SPEC 5L 2012 edition, it is defined the scope as:”Requirements for the manufacture of two product specification level (PSL1 and PSL2) of seamless and  welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries. This standard is not applicable to cast pipe.”

    In a word, API 5L pipe is the carbon steel pipe applied to the oil and gas transmission system. Meanwhile, other fluids like steam, water, slurry also  could adopt the API 5L standard for the transmission purposes.

    Different  manufacturing type

    API 5L specification covers the manufacturing types in welded and seamless.

    And  welded pipe common types are spiral submerged arc welded pipe (SSAW), straight  seam submerged arc welding pipe(LSAW), and resistance welded pipe (ERW).

    Check here for the differences between the ERW, LSAW, and SSAW pipe.

    On  the other hand, seamless manufacturing type usually for the small diameters pipe, (the pipe diameter is less than 150 mm or 6 inch, the seamless steel pipe is more applied than steel pipe in welded.)

    For  your info, there are also big diameters seamless pipe. By hot rolled  manufacturing process we could get seamless pipe diameters at most 20 inch (508  mm). But if you need the seamless pipe more than 20&rdquo, we can get it through hot  expanding processes, maximum diameters to 40 inch 1016 mm.

    API 5L pipe  manufacturing development

    Besides  Seamless and ERW, SAW manufacturing technologies, in the earliest years the API 5L steel pipe also could be made in furnace lap-welded (deleted in API 5L in 1962).

    As  the development of pipeline steel plate making technology, pipe forming and  welding technology also has been much improved, so a lot of ERW pipe and SAW pipe used in the pipeline constructions.

    Specially for the big diameter steel pipe, SAW pipe gains a great advantage. With less raw material cost, simplified and uniform production procedures, welded steel pipe has taken the first place in oil and gas line pipe industries.

    API 5L covers Different grades

    API 5L steel line pipe adopts different steel grades, generally are Gr. B, X42, X46, X52, X56, X60, X65, X70, X80. Some manufacturers are capable of  manufacturing steel grade up to X100 and X120. As the steel line pipe grades higher, more strictly control on the carbon equivalent control, and higher mechanical strength performances.

    More  over, for the same grade API 5L pipe, seamless and welded chemical elements content is different, which welded pipe is required more strictly and lower on Carbon and Sulfur.

    By different delivery condition, there are also As-rolled, normalizing rolled, thermomechanical rolled, normalizing formed, normalized, normalized and  tempered, quenched and tempered.

    Delivery  Conditions for each steel grades


    To be continue:


    For intermediate grades, API 5L pipe grade shall be in one of following description format:

    a. The letter L followed by the specified minimum yield strength in Mpa. For example, L290 (X42) means the minimum yield strength is 290 Mpa. In case of PSL2 pipe, Suffix letter (R, N, Q or M) shall be added to describe the delivery condition;

    b. The letter X followed by a two or three digital number equal to the minimum yield strength in 1000 psi rounded down to the nearest integer and, for PSL2 pipe, the letter describing the delivery condition (R, N, Q, or M) consist with the above formats.

    Letter R: As rolled

    Letter N: Normalizing rolled, Normalized formed, Normalized

    Letter Q: Tempered and quenched

    Letter M: Thermomechanical rolled or thermomechanical formed

    Product  specification level (PSL1 and PSL2 in API 5L)

    What is PSL

    PSL is the abbreviation of product specification level. The product specification  level can be divided into PSL1 and PSL2, it also could be deemed as quality  level.

    PSL1 and PSL2  differences

    Please click here for the differences between PSL1 and PSL2 pipes.


    PSL1 and PSL2 are not only different for testing requirements, but also for chemical composition and mechanical properties.

    PSL1 is more strict than PSL2 in chemical composition, tensile properties, impact work, nondestructive testing and other indicators.

    For more details please click here for Differences between API 5L PSL1 and PSL2. 

    Impact performance

    PSL1 does not require impact performance, and PSL2 need to do except X80.

    Non-destructive test

    PSL1  does not require non-destructive test, where PSL2 required non-destructive test.

    (NDT:  Non-destructive inspection and testing. It is to use radiographic, ultrasonic  or other methods (not to breaking the material) in API 5L standard, to reveal  pipe defects, imperfections.)

    API 5L pipe material specification

    Material specification including chemical composition and mechanical properties for PSL1  and PSL2 pipe.

    Line pipe chemical composition

    Chemical composition for PSL1 line pipe with wall thickness ≤ 25.0 mm (0.984 inch)

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