Both API 5L Gr.B Steel pipes and ASTM A106 Gr.B steel pipes are carbon steel pipes and are used for oil and gas transportation. Both of them can be welded, but ASTM A106 Gr.B pipes are seamless pipes.
API 5L Gr.B steel pipes are derived from API Spec 5L specification for line pipe,and they are suitable for the transportation of gas,oil and water. API 5L Gr.B steel pipes include two kind of service level:PSL1 and PSL2. PSL1 is a standard quality for line pipe, and PSL2 contains additional chemical,mechanical properties,and testing requirements.
ASTM A106(S/A 106) steel pipes are the standard specification for seamless carbon steel pipe for high-temperature and pressure service. ASTM A106 steel pipe includes 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.
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