What is the difference between X52 and X65 pipe

X52 and X65 pipe are pipeline steels under API SPEC 5L specification, which provides standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries. API 5L X52 and X65 pipe cover seamless and welded steel line pipe. What is the difference between X52 and X65 pipe? Below we make a comparison of chemical composition and mechanical properties difference between X52 and X65 pipe.

Chemical composition difference between X52 and X65 pipe:

Grade	C	Si	Mn	P	S	V	Nb	Ti
API 5L X52	0.16	0.45	1.65	0.02	0.01	0.07	0.05	0.04
API 5L X65	0.16	0.45	1.65	0.02	0.01	0.09	0.05	0.06

Mechanical properties difference between X52 and X65 pipe:

Grade	Yield Strength	Tensile Strength	Yield to Tensile	Elongation
Grade	min. (KSI)	min. (KSI)	Ratio (max)	%
API 5L X52	52	66	0.93	21
API 5L X65	65	77	0.93	18

From above, we can know the difference especially the strength difference between X52 and X65 pipe is obvious. The alloy elements such as V, Ti of X65 pipe is higher than that of X52 pipe. Consequently, the X65 pipe strength is higher than X52 pipe strength.

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