API 5L Line Pipes Mechanical Properties

Line pipe grade designations come from API 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. 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), e.g. X60 for pipe having a minimum yield strength of 60 ksi. See the table below for the standard available grades.

Line Pipe Mechanical Properties

API 5L Grade	Yield Strength	Tensile Strength	Yield to Tensile Ratio	Elongation
	min.	min.	(max.)	min.
	(ksi)	(ksi)		1%
A	30	48	0.93	28
B	35	60	0.93	23
X42	42	60	0.93	23
X46	46	63	0.93	22
X52	52	66	0.93	21
X56	56	71	0.93	19
X60	60	75	0.93	19
X65	65	77	0.93	18
X70	70	82	0.93	17
X80	80	90	0.93	16

API 5L 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.

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API 5L Line Pipes Mechanical Properties