American standard API 5L Gr. B MS steel

API 5L generally refers to pipeline pipes, which transport oil, steam, and water extracted from the ground to oil and natural gas industry enterprises. Pipeline pipes include seamless pipes and welded steel pipes, with flat ends, threaded ends, and socket ends at the pipe ends; The connection methods include welding, coupling connection, socket connection, etc.

Pipeline steel standard: API SPEC 5L.
Purpose of pipeline steel: Used for gas, water, and oil transportation in the petroleum and natural gas industries.

API 5L standard material grade: PSL-1, PSL-2
Chemical composition requirements for API 5L Gr. B MS steel material:
PSL-1 level:
Pipeline pipe L245/B steel grade: C ≤ 0.28%, Mn ≤ 1.20%, P ≤ 0.030%, S ≤ 0.030%, Nb+V+Ti ≤ 0.15%, Cu ≤ 0.50%, Ni ≤ 0.50%, Cr ≤ 0.50%, Mo ≤ 0.15%

PSL-2 level:
Pipeline pipe L245N/BN steel grade: C ≤ 0.24%, Si ≤ 0.40%, Mn ≤ 1.20%, P ≤ 0.025%, S ≤ 0.015%, Nb+V+Ti ≤ 0.06%, Ti ≤ 0.04%, Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15%, B ≤ 0.004%

Pipeline L245M/BM grade: C ≤ 0.22%, Si ≤ 0.45%, Mn ≤ 1.20%, P ≤ 0.025%, S ≤ 0.015%, Nb ≤ 0.05%, V ≤ 0.05%, Ti ≤ 0.04%, Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15%, B ≤ 0.004%

API 5L Gr. B MS steel material tensile test requirements:
PSL-1 grade: yield strength ≥ 245MPa, tensile strength ≥ 425MPa
PSL-2 grade: yield strength 245MPa-450MPa, tensile strength: 415MPa-655MPa, yield ratio ≤ 0.93.