API 5L Grade B Pipe

The API 5L Grade B specification includes welded and seamless pipes. The electric resistant weld ERW pipes range from ½ inches to 24 inches in diameter whereas the seamless pipes range from ½ inches to 60 inches in diameter. The wall thicknesses vary depending on the schedules of these pipes. There are schedules 20 through XXS and heavier with up to 250mm wall thickness in this range of pipes. There are two product specification levels within grade B. The API 5L PSL1 Grade B and the API 5L PSL2 Grade B are in use but the PSL1 is the most used one. The PSL2 has slightly higher mechanical properties than PSL1. The NACE MR0175 covers this specification and therefore makes it applicable for corrosion resistant applications. The uses of these pipes can be seen in oil, natural gas and petroleum industries. The yield strength of Grade B pipe is at 240MPa minimum and the tensile strength is at a minimum of 415MPa. The API 5L Gr.B Carbon Steel pipes could be plain, beveled screwed or threaded. The length also varies from random, double random to required lengths. Hot rolling and cold drawing methods are applied in production of these pipes and they could be used in engineering purposes and power generation applications as well.

API 5L Grade B material Dimensions Standard and Specification


Seamless/ SAW/ ERW / LSAW / DSAW

2" to 24" O.D.


Wall Thickness

Schedule 10 to 160, STD, XS, XXS


Pipe End

Plain, Bevelled

Standard and Dimensions
Trade Name API SPEC 5L ISO 3183 PSL1 / PSL2 Grade B / Grade A
Producing Standard ASTM, ASTM A106/A106M, GB/T3091, 5L, GB/T9711 ASTM A139, ANSI/API GB13296-91, EN10296, ASME B36.10, API 5CT, ASTM A53/A53M, ISO3183, GB/T14975, ASTM A333/A333M, GB9948, GB/T14976
PSL Designate
  • Grade A25 X42 PSL1
  • Grade B X42 PSL2
Pipe End Type Abbreviations
  • X42 PSL1 : Plain, threaded, special coupling pipe, bevelled
  • X42 PSL2 : Plain-end
PSL1 Grade
  • Grade A
  • Grade B
Various Processes LW, LFW, SMLS, SAWH, SAWL, HFW
Length 6-12 meters
Testing method H2 SERVICE, CVN impact, NACE MR0175, SSC, TM0177, Hardness, HIC, DWT, TM0284, IBR
Steel material
Material Origins European, Korean, Ukraine, Indian, Japanese, Russian, US
Mill Test Certificate (MTC) EN 10204/3.1B

Common types of API 5L Gr.B PSL2 / PSL1

API 5L Grade B Pipe

API 5L Grade B Pipe

Seamless Line Pipe and Steel Piles

API 5L Grade B Seamless Pipe

API 5L Grade B Seamless Pipe

Hsaw/ Dsaw / Welded Steel Line Pipe

API 5L Grade B Line Pipe

API 5L Grade B Line Pipe

High Yield Sour Service Line Pipes / Sawh Pipeline, Piling

API 5L Grade A Vs B

Check the composition and mechanical defference between Grade A and Grade B Line Pipe

Grade A vs Grade B Seamless Line Pipe

Grade C Mn P S V Nb Ti
max b max b max max max max max
A 0.22 0.9 0.3 0.3
B 0.28 1.2 0.3 0.3 c,d c,d d

Grade A vs Grade B Welded Line Pipe

Grade C Mn P S V Nb Ti
max b max b max max max max max
A 0.22 0.9 0.3 0.3
B 0.26 1.2 0.3 0.3 c,d c,d d

API 5L Grade A vs Grade B PSL1 Seamless & Welded Line Pipe Mechanical Properties

Grade Tensile Strength - Pipe Body of Seamless and Welded Pipes PSL 1 Welded Pipe's Seam
Yield Stress A Tensile Stress A Elongation Tensile Stress B
Rt0,5 PSI Minimum Rm PSI Minimum (in 2in Af % Minimum) Rm PSI Minimum
Gr.A 30,500 48,600 c 48,600
G. B 35,500 60,200 c 60,200

Is API 5L Grade B Linepipe Repairable?

In API 5L Grade B only PSL 1 are repaired as per agreement between the purchaser and the manufacturer but Gr.B PSL2 linepipe not allowed to repair.

Different types of pipeline coatings

Different types of pipeline coatings

Pipeline equivalent



ERW / Welded



EN 10216-1 P265

EN 10217-1 P265

BS 3601 430

SA106 Gr.B

EN 10216-2 P265GH


BS 3601 430

Chemical Composition


C max %

Mn max%

S max %

Si min %

Cr max %

Cu max %

A106 Grade B







API 5L Grade B







Mechanical Properties


 Mpa Tensile Stress

 Mpa Yield Stress

Elongation %

A106 Grade B




API 5L Grade B




Pipe Coating Technical Chart

Coating Standard Thickness Temperature Range
DIN 30670 1.8-3.0 mm -60 °С to 60 °С
NFA 49710 1.2-3.5 mm -60 °С to 60 °С
CAN/CSA Z 245/21-02 2.0-3.5 mm -60 °С to 60 °С
Shell DEP 2.5-3.7 mm -60 °С to 60 °С
DNV RP-106 As per client specification As per client specification
DIN 30678 1.8-2.5 mm -20 °С to 60 °С
NFA 4911 1.2-2.5 mm -20 °С to 60 °С
Projects and tenders Max. 1400 microns -60 °С to 80 °С
API 5L2 (RP5L2) min. 50 microns -20 °С to 60 °С
ISO 15741 60-100 microns -20 °С to 60 °С

Application and Uses

  • Refinery Piping
  • Gas transmission lines
  • Underground oil and gas transmissions
  • Oil spills
Application and Uses
  • PSL means Product Specification Level, PSL2 Pipe is used where fracture toughness required for critical stress applications. PSL2 also have vast chemical composition than PSL1.

Pipelines are Easy to repair and producing time is less.