PSL-1 grade:
Pipeline pipe X42/L290 steel grade: C≤0.28%, Mn≤1.30%, P≤0.030%, S≤0.030%, Nb+V+Ti≤0.06%, Cu≤0.50%, Ni≤0.50%, Cr≤0.50%, Mo≤0.15%
PSL-2 grade:
Line pipe L290N/X42N steel grade: C ≤ 0.24%, Mn ≤ 1.20%, P ≤ 0.025%, S ≤ 0.015%, Nb ≤ 0.05%, V ≤ 0.06%, Ti ≤ 0.04%, Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30%, Mo ≤ 0.15%, B ≤ 0.004%.
Line pipe L290M/X42M grade: C≤0.22%, Mn≤1.30%, 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 standard X42/L290 material tensile test requirements:
PSL-1 grade: yield strength ≥290MPa, tensile strength ≥415MPa
PSL-2 grade: yield strength -290MPa ~ 495MPa, tensile strength: 415MPa ~ 655MPa, yield ratio ≤ 0.93
