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What’s The Difference Between API 5L Gr.B And A106 Gr.B?

Shaanxi World Iron & Steel Co.,Ltd | Updated: Jun 19, 2018

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


API 5L Gr.b(L245) pipe come from API Spec 5L Specification for Line Pipe with the application of gas, water and oil transportation. Standard Line Pipe has grade designation A and B. API 5L Grade b pipe can be two of API 5L product service level (PSL),that’s is API 5L Gr.B PSL1 and API 5L Gr.B PSL2.


ASTM A106(S/A 106) pipe is the standard specification for seamless carbon steel pipe for high-temperature and pressures service. ASTM A106 pipe including three grades:ASTM A106 Grade A,ASTM A106 Grade B,ASTM A106 Grade C. ASTM A106 grade B Pipe is used in power plants, boilers, petrochemical plants, oil and gas refineries, and ships where the piping must transport fluids and gases that exhibit high pressures and temperatures.


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 A106 grade B and API 5L Gr.B PSL 1 in chemical and physical property:

Chemical Requirement


C max %

Mn max%

S max %

Si min %

Cr max %

Cu max %

A106 Gr.B







API 5L Gr.B/L245







Tensile Requirement:


Tensile Strength Mpa

Yield Strength Mpa

Elongation %

A106 Gr.B




API 5L Gr.B/L245





The two pipe specifications overlap but vary. A Pipe may or may not meet both API 5L Gr.b and A106 Gr.b. Equivalent standards of them listed below:




 Other standards

API 5L Line Pipe B/L245

EN 10216-1 P265

EN 10217-1 P265

BS 3601 430

A106 Gr.B

EN 10216-2 P265GH


BS 3601 430


When connected API 5L Gr.b or A106 Gr.b steel pipe, some fitting and flanges may be intersubstituted and interchangeable. If you are you also Looking for Carbon Steel Pipe Fittings ASTM A234 WPB, ASTM A105 carbon steel pipe fittings such as pipe fittings, flanges, fasteners and gaskets. WORLD IRON STEEL is a good vendor, we stocks and supplies full range of API 5L Grade B Seamless Pipes and Welded Pipes, A106 Gr.B seamless pipes with plenty quantity and cheap price,welcome to call fro us.

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