API Spec 5L pipeline steel pipes are mainly used for gas, water and oil transportation in oil and gas industry.

API 5L standard material grade: PSL-1, PSL-2.

Properties of pipeline steel pipe API 5L Gr B or L245 - chemical composition:
Pipeline steel pipe API 5L Gr B or L245 chemical composition requirements: PSL-1 grade: pipeline 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 grade: 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%.

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%.

Properties of pipeline steel pipe API 5L Gr B or L245 - mechanical property:
Tensile test requirements of pipeline steel pipe API 5L Gr B or L245:
PSL-1 grade: yield strength ≥ 245MPa, tensile strength ≥ 425MPa
PSL-2 grade: yield strength 245MPa - 450MPa, tensile strength 415MPa - 655MPa, yield ratio ≤ 0.93.