API SPEC 5L is a 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 PSL2 X42 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B.

Application: gas, water and oil transportation in both oil and natural gas.
Mechanical Properties of Steel According to API 5L PSL2 X42

API 5L PSL2 X42 pipe Size:

  • Outer Dimensions.: 6 mm – 219 mm
  • Wall Thickness: 1.0 mm – 30 mm
  • Length: max 12 meters


  • Pipes are supplied:
  • Black, bear or Internal and External Anti-corrosion
  • External varnished with black or clear lacquer

Impact test

Min.(joules) Min.(joules)
27 20

Pipes are supplied with marking according to standard and customer request.Marking:

  • Marking is paint on the ends of pipes. The same data, as well as additional information per
  • request of client, is indicated on the bundles tags.


  • Pipes are supplied in hexahedral bundles or round bundles tied with steel strip. Weight of bundle up to 5000 kg upon request of customer. Each bundle is furnished with three tags.

Chemical composition(%) API 5L PSL2 X42

See the table below for the standard available grades.

Grade C Mn P S Si V Nb Ti CEpcm
(max) (max) (max) (max) (max) (max) (max) (max) (max)
X42 0.24 1.2 0.025 0.015 0.4 0.06 0.05 0.04 0.25

Mechanical requiremnts of API 5L PSL2 X42

Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5L PSL2 X42 245-495 415-760


Line pipe mechanical testing usually omits Reduction of Area (RA) measurement reporting, and Charpy V-Notch (CVN) testing. This prevents use of this pipe as body material above 36 ksi yield strength for API Spec 6A equipment without retesting for Reduction of Area, and in the case of low temperature service, Charpy V-Notch testing as well.

  • 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

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