套管和油管用无缝钢管
套管和油管用无缝钢管标准:API SPEC 5CT —— 美国石油学会标准用途:用于油井用套管和油管的无缝钢管主要生产钢管牌号:J55、K55、N80、L80、P110等尺寸公差: 钢管种类外径(D)壁厚(S)冷拔管钢管外径(mm)允许偏差(mm)允许偏差(mm)<114.30.79-12.5%114.3-0.5%,+1%力学性能:标准牌号抗拉强度(MPa)屈服强度(MPa)伸长率(%)硬度API
尺寸公差:
钢管种类 | 外径(D) | 壁厚(S) | |
冷拔管 | 钢管外径(mm) | 允许偏差(mm) | 允许偏差(mm) |
<114.3 | ±0.79 | -12.5% | |
≥114.3 | -0.5%,+1% |
力学性能:
标准 | 牌号 | 抗拉强度(MPa) | 屈服强度(MPa) | 伸长率(%) | 硬度 |
API SPEC 5CT | J55 | ≥517 | 379~552 | 查表 | |
K55 | ≥517 | ≥655 | |||
N80 | ≥689 | 552~758 | |||
L80(13Cr) | ≥655 | 552~655 | ≤241HB | ||
P110 | ≥862 | 758~965 |
化学成分:
标准 | 牌号 | 化学成分(%) | ||||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | Als | ||
API SPEC 5CT | J55K55 (37Mn5) | 0.34~0.39 | 0.20~0.35 | 1.25~1.50 | ≤0.020 | ≤0.015 | ≤0.15 | ≤0.20 | ≤0.20 | ≤0.020 | ||
N80 (36 Mn2V) | 0.34~0.38 | 0.20~0.35 | 1.45~1.70 | ≤0.020 | ≤0.015 | ≤0.15 | 0.11~0.16 | ≤0.020 | ||||
L80(13Cr) | 0.15~0.22 | ≤1.00 | 0.25~1.00 | ≤0.020 | ≤0.010 | 12.0~14.0 | ≤0.20 | ≤0.20 | ≤0.020 | |||
P110 (30CrMo) | 0.26~0.35 | 0.17~0.37 | 0.40~0.70 | ≤0.020 | ≤0.010 | 0.80~1.10 | ≤0.20 | ≤0.20 | 0.15~0.25 | ≤0.08 | ≤0.020 |