What is the difference between API 5L Gr.B and A106 Gr.B?

Feb 20, 2020

API 5L Gr.B and A106 Gr.B are both carbon steel that are used in oil and gas transportation. Both of them can be welded, but the most of A106 Gr.B pipe are seamless. Here are some tiny details about API 5L Gr.B and A106 Gr.B in chemical and mechanical property:

Chemical composition

Grade	C max	Mn max	S max	Si max	Cr max	Cu max
API 5L Gr.B	0.28	1.20	0.03	/	0.50	0.50
A106 Gr.B	0.30	0.29-1.06	0.035	0.10	0.40	0.40

Mechanical properties

Grade	Tensile Mpa	Yield Mpa	Elongation %
API 5L Gr.B	≥415	≥245	23
A106 Gr.B	≥415	≥240	20

Equivalent standard

Grade	Seamless	Welded	Other grade
API 5L Gr.B	EN 10216-1 P265	EN 10217-1 P265	BS 3601 430
A106 Gr.B	EN 10216-2 P265GH	/	BS 3601 430

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