API 5L X42 Pipe

API 5L X42 is a specification of pipes used for transportation of oil, gas and water under high temperatures. The pipes are used in natural gas industries, oil refineries and in water lines. These have a minimum yield strength of 42000PSI and a minimum tensile strength of 60000PSI. There are variations of the pipes that are made in seamless and welded conditions. Also there are plain ended, belled-end, threaded and through the flowline pipes available. There are two product specification levels available, the PSL1 and the PSL2. PSL1 is the commonly used while PSL2 comes with added mechanical properties. API 5L X42 PSL2 and the API 5L X42 PSL1 both could be hot rolled, seamless or welded. Their nominal bore size ranges from 3/8 inches to 30 inches. Their pressure ratings and wall thicknesses differ with the schedules and there are schedules 20 through XXS and heavier in API 5L Grade X42. There are different grades such as API 5L X42 Grade B which specify their mechanical properties for different applications. The HIC Tested X42 pipes are resistant to hydrogen embrittlement. The standard ISO 3183 L290 Grade X42 has to undergo this test as part of the quality control procedure. They can come with epoxy coating, 3LPE coating or color coating as well.

X42 Carbon Steel Pipe Specification Chart


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 X42, ASTM A106/ A53/ A333 Grade 6/ API 5L GR.B X42
Standard ASTM A106/A106M, GB13296-91, GB9948, ANSI/API API 5CT, ISO3183, EN10296, ASTM A53/A53M, ASTM A333/A333M, 5L, ASTM, GB/T3091, ASME B36.10, GB/T9711 GB/T14976, ASTM A139, GB/T14975
PSL Level
  • Grade A25 X42 PSL1
  • Grade B X42 PSL2
Pipe End Types
  • X42 PSL1 : Plain, threaded, special coupling pipe, bevelled
  • X42 PSL2 : Plain-end
PSL1 Grade
  • Grade A
  • Grade B
Length 6-12 meters
Test procedure involves SSC, DWT, H2 SERVICE, CVN impact, IBR, NACE MR0175, TM0177, TM0284, Hardness, HIC
Material Equivalent
Material Origins US, European, Russian, Japanese, Korean, Indian, Ukraine
Mill Test Certificate (MTC) EN 10204/3.1B

Basic types of API 5L X42 PSL1/2 Pipe

API 5l X42 PSL2 Pipe

API 5l X42 PSL2 Pipe

Saw, Hsaw, Sawh Welded Steel Pipe

X42 Seamless Pipe

X42 Seamless Pipe

High Yield, Fluid Sour Service Line Pipes

X42 Carbon Steel Pipe

X42 Carbon Steel Pipe

Steel Piles, Piling, Helical Steel Pipe

X42M PSL2 meaning

Grade Letter Delivery Condition
X42M "M" letter means Thermomechanical rolled or thermomechanical formed

What is X42Q PSL2 pipe?

Grade Letter Delivery Condition
X42Q "Q" letter means Quenched and tempered

What "N" defines in X42N PSL2 Pipe?

N define the delivery condition in X42N PSL2 Pipe, if required normalizing formed, normalized or normalized and tempered or Normalizing rolled Pipe in any grade so it comes with "N" marking.

Grade Letter Delivery Condition
X42N "N" letter means normalized or normalized and tempered, Normalizing rolled, normalizing formed

What is PSL2 X42R Pipe?

Grade Letter Delivery Condition
X42R / BR "R" letter means As-rolled

What is X42 USC Unit grade?

ISO 3183 L290 pipe / L290Q / L290N / L290M

Is X42 Linepipe easily repairable?

PSL2 Repair by welding of Pipe body, plate and skelp is Prohibited but PSL1 are Repairable Permitted by agreement.

API 5L X42 PSL2 Pipe Coating Services

API 5L X42 PSL2 Pipe Coating Types

API 5L Grade X42 Pipe Equivalent grades table

Werkstoff Nr. European Number API Spec Equivalent material grade
StE 285 1.0486 - API 5L Gr X42  A53 Gr. B, A106 Gr. B, API 5L Gr. B X42
High Yield Pipe
StE 290.7 1.0484 L290NB API 5L Gr X42 -

API 5L X42 PSL1 Pipeline Chemical Composition Table


C (Maximum)

Mn (Maximum)

P (Maximum)

S (Maximum)

C (Maximum)

Mn (Maximum)

P (Maximum)

S (Maximum)









X42 Steel Mechanical Behaviour

X42 PSL 2 Pipe Body of SMLS and Welded Pipes Tensile Properties Seam for Welded Pipe
Yield Stress a Tensile Stress a Ratio a,c Elongation Tensile Stress d
Rt0,5  PSI Minimum Rm  PSI Minimum R10,5IRm (in 2in) Rm (psi)
Af %
Min. Max. Min. Max. Max. Min. Min.
42,100 71,800 60,200 95,000 0.93 f 60,200

API 5L X42 Pipe Specific Temperature Range

Hot-coated Grade with epoxy powder Temperature
X42 PSL1/2 200°C

Grade B X42 Pipe Pressure Rating Chart

290 Mpa 42100 Psi

Difference between API 5L X42 PSL2 and PSL1

Product Level Specification for Grade X42 X42 PSL 1 X42 PSL 2
Charpy Testing Not required Mendentery for all grades
Seamless NDT Testing In case of SR4 SR4 required
Requirement of Certification In case of SR15 required (SR 15.1)
Traceable Traceable only until all tests are passed, unless SR15 is specified Traceable after completion of tests (SR 15.2) mandatory
Hydrostatic Testing Mendentery Mendentery

Uses and Applications of X42 Line Pipe

  • Oil and gas refineries
  • Onshore industry
  • Offshore industry
  • Sour services
Application of X42 Line Pipe
  • All external pipe coating and internal pipe-lining are must be 100% visually inspected which complies with API 5L Annex E.

In Line Pipe Crude oil flows at a speed of 3 miles per hour.