● 用途:用于石油、天然气工业中的气、水、油输送用于油井中抽取石油或天然气。套管用作油气井的井壁。  API 5CT 尺寸偏差项目允许偏差外径管体D≤101.60mm±0.79mmD≥114.30mm +1.0%         -0.5%  壁厚-12.5%重量单根+6.5%+3.5%车载量-1.75     机械性能纲级屈服强度(MPa)抗拉强度(MPa)延伸率最低最高最低最低PsiMpaPsiMpaPsiMpaHRCHBWJ-55550003798000055275000517--K-55550003798000055295000655--N-808000055211000758100000689--L-80-180000552950006559500065523241C-909000062110500072410000068925.4255C-9595000655110000758105000724--T-959500065511000075812500072425.4255P-110110000758140000965100000862--M-6565000448850005861000006892223580 SS830005709900068010000068923241BG80T80000552110000758100000689--BG110T110000758140000965125000862--          长度项目范围1范围2范围3油管6.10-7.32m8.53-9.75m-套管4.88-7.62m7.62-10.36m10.36-14.63m    标准牌号化学成分（％）   CSiMnPSCrNiCuMoVAlsAPI SPEC 5CTJ55K55(37Mn5)0.34～0.390.20～0.351.25～1.50≤0.020≤0.015≤0.15≤0.20≤0.20  ≤0.020N80(36 Mn2V)0.34～0.380.20～0.351.45～1.70≤0.020≤0.015≤0.15   0.11～0.16≤0.020L80(13Cr)0.15～0.22≤1.000.25～1.00≤0.020≤0.01012.0～14.0≤0.20≤0.20  ≤0.020P110,(30CrMo)0.26～0.350.17～0.370.40～0.70≤0.020≤0.0100.80～1.10≤0.20≤0.200.15～0.25≤0.08≤0.020