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API 5L pipe
API 5L pipe
API 5L pipe
API 5L pipe

API 5L for water gas oil coal well oil drill pipe

API 5L pipe is carbon steel pipe used for oil and gas transmissions, it includes the pipes manufactured in seamless and welded (ERW, SAW).
Product introduction

API 5L pipe is carbon steel pipe used for oil and gas transmissions, it includes the pipes manufactured in seamless and welded (ERW, SAW). Materials covers API 5L Grade B, X42, X46, X52, X56, X60, X65, X70, X80 PSL1 & PSL2 onshore, offshore and sour services. API 5L the implementation standard of steel pipe for pipeline transportation system and specification for line pipe.

Grades: API 5L Grade B, X42, X52, X56, X60, X65, X70, X80
Product Specification Level: PSL1, PSL2, onshore and offshore sour services
Outer Diameter Range: 1/2” to 2”, 3”, 4”, 6”, 8”, 10”, 12”, 16 inch, 18 inch, 20 inch, 24 inch up to 40 inch.
Thickness Schedule: SCH 10. SCH 20, SCH 40, SCH STD, SCH 80, SCH XS, to SCH 160
Manufacturing Types: Seamless (Hot Rolled and Cold Rolled), Welded ERW (Electric resistance welded), SAW (Submerged Arc Welded) in LSAW, DSAW, SSAW, HSAW
Ends Type: Beveled ends, Plain ends
Length Range: SRL (Single Random Length), DRL (Double Random Length), 20 FT (6 meter), 40FT (12 meter)or customized
Protection Caps in plastic or iron
Surface Treatment: Natural, Varnished, Black painting, FBE, 3PE (3LPE), 3PP, CWC (Concrete Weight Coated) CRA Clad or Lined


API 5L Pipe Standard Scope

In API SPEC 5L 46th 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.


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.


Different Manufacturing Types

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

Technical data
Chemical Analysis Standard
Class Grade C Si Mn P S V Nb Ti
max max max max max max max max
ISO 3181
PSL1 L245 or B 0.26 - 1.20 0.030 0.030 - - -
L290 or X42 0.26 - 1.30 0.030 0.030 - - -
L320 or X46 0.26 - 1.40 0.030 0.030 a,b a,b b
L360 or X52 0.26 - 1.40 0.030 0.030 b b b
L390 or X56 0.26 - 1.40 0.030 0.030 b b b
L415 or X60 0.26 - 1.40 0.030 0.030 c c c
L450 or X65 0.26 - 1.45 0.030 0.030 c c c
L485 or X70 0.26 - 1.65 0.030 0.030 c c c

Mechanical Properties
Class Grade Yield Strength
Yield Strength
min max min max max
PSL2 L245R or BR
L245N or BN
L245Q or BQ
L245M or BM
245 450 415 655 0.93
L290R or X42R
L290N or X42N
L290Q or X42Q
L290M or X42M
290 495 415 655 0.93
L320N or X46N
L320Q or X46Q
L320M or X46M
320 525 435 655 0.93
L360N or X52N
L360Q or X52Q
L360M or X52M
360 530 460 760 0.93
L390N or X56N
L390Q or X56Q
L390M or X56M
390 545 490 760 0.93
L415N or X60N
L415Q or X60Q
L415M or X60M
415 565 520 760 0.93
L450Q or X65Q
L450M or X65M
450 600 535 760 0.93
L485Q or X70Q
L485M or X70M
485 635 570 760 0.93
L555Q or X80Q
L555M or X80M
555 705 625 825 0.93
L625M or X90M
L625Q or X90Q
625 775 695 915 0.95
L690M or X100M
L690Q or X100Q
690 840 760 990 0.97
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