API 5L X56

API 5L X56 Seamless & Welded Pipe
API 5L X56 Butt Weld Fittings
API 5L X56 Forged Fittings
API 5L X56 Manifold Fittings
API 5L X56 Flanges
API 5L X56 Specialty Items

API 5L X52 Industry Specifications Chemical Composition Yield Strength
min. (KSI)
Tensile Strength
min. (KSI)
Yield to Tensile
Ratio (max)
Elongation
%
ASTM A105, A106, A234, A333, A350, A420, A694,A860 C 0.16
Si 0.45
Mn 1.65
P 0.020
S 0.010
V 0.07
Nb
0.05
Ti
0.04
56 71 0.93 19

API 5L X56

Grade X56 indicates 56000 PSI minimum yield strength and 71000 PSI minimum ultimate tensile strength.

API Standard Specification for Line Pipe

The American Petroleum Institute specification API 5L addresses seamless and welded steel line pipe for pipeline transportation systems in the petroleum and natural gas industries.  API 5L is suitable for conveying gas, water, and oil.  

Specifications for API 5L adhere to the International Organization for Standardization ISO 3183, standardizing pipeline transportation systems within the materials, equipment and offshore structures for natural gas, petroleum, and petrochemical industries.  When authoring the standards, the technical committee recognized that there are two basic Product Specifications Levels (PSL) of technical requirements and therefore developed PSL 1 and PSL 2.  PSL 1 is a standard quality for line pipe where PSL 2 contains additional chemical, mechanical properties, and testing requirements. 

Grades covered by this specification are A25, A, B and "X" Grades X42, X46, X52, X56, X60, X65, X70, and X80.  The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade.