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api5l gr.b pipes 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. grades covered by api 5l specification are a,b and “x” grades x42,x46,x52,x56,x60,x65,x70, x80.the two digit number following the “x” indicates the minimum yield strength (in 000’s psi) of pipe produced to this grade.
astm a106(s/a 106) pipe is the standard specification for seamless carbon steel pipe for high-temperature and pressure 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 is used in oil and gas transportation. both of them can be welded, but the most of a106 gr. b pipe is seamless. here are some tiny details about a106 grade b and api 5l gr. b psl 1 in chemical and physical property:
standards | c max % | mn max% | s max % | si min % | cr max % | cu max % |
a106 gr. b | 0.30 | 0.29-1.06 | 0.035 | 0.10 | 0.40 | 0.40 |
api 5l gr.b/l245 | 0.28 | 1.20 | 0.030 | / | 0.50 | 0.50 |
tensile requirement
standards | tensile strength mpa | yield strength mpa | elongation % |
a106 gr. b | ≥415 | ≥240 | 20 |
api 5l gr.b/l245 | ≥415 | ≥245 | 23 |
the two kinds of pipe specifications overlap but vary a little. a pipe may or may not meet both api 5l gr.b and a106 gr.b. equivalent standards of them listed below:
standard | seamless | welded | 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 |
