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Oil pipe enjoyed a high reputation throughout the world.It is widely exported to many countries. model number: J55,K55, N80, L80, P110 etc Mechanicalproperties Standard codes Models of steel tubes Tensity strength MPa Yield strength MPa Elongation Hardness API SPEC 5CT J55 ≥517 379552 check the table K55 ≥517 ≥655 N80 ≥689 552758 L80(13Cr) ≥655 552655 ≤241HB P110 ≥862 758965 Chemicalcomposition: Standard codes Models of steel tubes Chemical compositions C Si Mn P S Cr Ni Cu Mo V Als API SPEC 5CT J55K55 (37Mn5) 0.340.39 0.200.35 1.251.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 ≤0.020 N80 (36 Mn2V) 0.340.38 0.200.35 1.451.70 ≤0.020 ≤0.015 ≤0.15 0.110.16 ≤0.020 L80(13Cr) 0.150.22 ≤1.00 0.251.00 ≤0.020 ≤0.010 12.014.0 ≤0.20 ≤0.20 ≤0.020 P110 (30CrMo) 0.260.35 0.170.37 0.400.70 ≤0.020 ≤0.010 0.801.10 ≤0.20 ≤0.20 0.150.25 ≤0.08 ≤0.020