API 5L X56/ISO 3183 L390 Line pipe


Mill Plant: BAO STEEL
Specification: API 5L /ISO 3183
Processing: Seamless / ERW Welded /LSAW /SSAW/ HSAW
Outer Diameters for Seamless: 1/2” – 24”
OD for ERW: Up to 24”
OD for LSAW: 16” to 48”
OD for SSAW/HSAW: Up to 100”
Pipe Thickness: SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XS, SCH XXS
Pipe Length: Single Random, Double Random & Required Length, Custom Size – 12 Meter
End Finishes: Square Cut, Threaded, Coupled, Beveled

The API 5L and ISO 3183 covers seamless and welded steel line pipe for the petroleum and natural gas industries as transportation pipe conveying gas, water, and oil. API 5L X56 or ISO 3183 L390 Line pipe is a commonly used grade line pipe for oil and gas pipeline transmissions. WIHO Metals is a professional supplier of API 5L X56 PSL1 /PSL2 and its equivalent material ISO 3183 L390 steel pipe, we provide the line pipe from BAO STEEL with a competitive price, also processing with internal & external coating like Black paint, varnished, Fusion Bonded Epoxy(FBE coating), 3-Layer polyethylene(3LPE) coating and all lined pipe on steel pipes to meet your requirements. We offer scheduled options, including schedule 40 and schedule 80 as well as non-scheduled sizes.


API 5L X56 Equivalent ASTM and ISO Material

API 5L Line pipe specifications
Material Grade PSL1 ASTM A106/A53 Grade B or ISO 3183 L390
Material Grade PSL2 L390N or X56N
L390Q or X56Q
L390M or X56M


API 5L X56 PSL1 Chemical Composition

Grades C Si Mn S V Nb Ti
X56 PSL 1(Seamless) 0.28 / 1.40 0.030 0.030 d d
X56 PSL1(Welded) 0.26 / 1.40 0.030 0.030 d d

API 5L X56 PSL2 Chemical Composition

Grades C Si Mn S V Nb Ti
X56N PSL2 0.24 0.45 1.4 0.025 0.015 0.05 0.04
X56Q PSL2 0.18 0.45f 1.5 0.025 0.015 0.05 0.04
X56M PSL2 0.22 0.45f 1.4 0.025 0.015 d d

API 5L X56 PSL1/PSL2 Mechanical Property

Grades Yield Strength, psi Tensile Strength, psi Elongation, in 2in
API 5L PSL1(X56) 56,600 71,100 c
API 5L PSL2(X56N,X56Q,X56M) 56,600-79,000 71,100-110,200 f



WIHO METALS is a steel carbon line pipe supplier covered by API 5L in grades A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80. We also stock a full range of API 5L and its equivalent material ISO 3183 line pipe in seamless and welded processes. For more information on our extensive Steel Pipe inventory, please contact us or fill in the form below.

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