API 5L X56 Line Pipe


Nominal Pipe Size 1/2″ to 48 ” O.D;

Length:5- 12 Meter lengths;

Wall Thickness – Schedule 10 through 160, STD, XS, XXS;

Product Specification Level (PSL) : PSL 1,PSL 2;

Manufacturing process: SSAW, LSAW, ERW welded/ Seamless;

Ends: Plain, beveled ends and threaded ends.

The American Petroleum Institute specification API 5L is designed for transportation systems in the petroleum and natural gas industries for conveying gas, water, and oil. API 5L X56 is a steel grade of API 5L which specifies the manufacture of two product levels (PSL1 and PSL2) line pipe. WLD Steel is one of the large manufacturers, suppliers of  API 5L steel pipe, we also provide internal & external coating like Black paint, varnished, FBE coating, 3LPE coating and all lined pipe on steel pipes as per the customers’ requirement. WLD steel supply and manufactured a large inventory of  API 5L X56 steel pipe in PSL1 and PSL2.

API 5l X56 Psl1 Equivalent

API 5L Specification for line pipe
Material Grade PSL2 L390N or X56N
L390Q or X56Q
L390M or X56M
Material Grade PSL1 L390 or x56

API 5L Grade X56 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
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 Grade X56 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

Differences between API 5L X56 PSL 1 and PSL 2

Charpy testing None required Required for all grades
Nondestructive inspection of seamless Only when the purchaser specifies   SR4 SR4 mandatory
Certification Certificates when specified per SR15 Certificates (SR 15.1) mandatory
Traceability Traceable only until all tests are passed, unless SR15 is specified Traceable after completion of tests (SR 15.2) mandatory
Hydrostatic Test Required Required