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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)

<114.3

±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




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