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Chemical compositions of casing pipe Standard Grade Chemical compositions(%) API SPEC 5CT J55 C Si Mn P S Cr Ni Cu Mo V K55 0.34~0.39 0.20~0.35 1.25~1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 / / N80 0.34~0...