API 5L GR.B PSL 1

This International Standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.

API 5L Gr.B Seamless steel pipes

Gr.B Seamless steel pipes

The Chemical Composition(%) of API 5L Gr.B PSL1

Mass fraction, based upon heat and product analysis a
Seamless pipe
C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.20 0.030 0.030 c,d c,d d
Welded pipe
C Mn P S V Nb Ti
maxb max.b max. max. max. max. max.
0.28 1.20 0.030 0.030 c,d c,d d
0.26 1.20 0.030 0.030 c,d c,d d

Note:

  • 0.50% maximum for copper, 0.50% maximum for nickel, 0.50% maximum for chromium, and 0.15% maximum for molybdenum.
  • For each reduction of 0.01% below the specified maximum concetration for carbon, an increase of 0.05% above the specified maximum concentration for manganese is permissible, up to a maximum of 1.65%
  • unless otherwise agreed, the sum of the niobium and vanadium contents shall be ≤0.06%.
  • The sum of the niobium ,vanadium and titanium concentratons shall be ≤0.06%.
  • Unless otheriwse agreed.
  • Unless otherwise agreed, the sum of niobium, vanadium and titanium concentrations shall be ≤ 0.15%

Mechanical requirements of API 5L Gr.B PSL1:

Y.S T.S ELONGATION
Mpa(psi) Mpa(psi)
min min min
245(35 500) 415(60 200) 28%

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