Dimension:OD: 114.3-508mm WT: 5.21-16.13mm
Grade:Casing：J55, K55, N80-1,N80-Q, L80-1, L80-9Cr,L80-13Cr,C95, P110,Q125.
Thread types:STC,LTC,BTC etc
Standards and Technical Conditions for Supply:API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells
Casings are used for fixing the well wall or down hole, which have wider diameters, can he divided into conductor casings, technical casings and Oil casings.
API SPEC 5CT well casing is utilized in fixing the well wall or down hole, which has wider diameters. API SPEC 5CT can be divided into conductor casing, technical casing and oil casing.
API 5CT Casing | Range 1 | Range 2 | Range 3 |
4.88~7.62 | 7.62~10.36 | 10.36~14.63 |
Casing&tubing and their colors:
Labels | OD(mm) | WT(mm) | J55/K55 | N80 | L80 | C90/T95 | P110 | Q125 | |
4 1/2 | 9.5 | 114.3 | 5.21 | PS | – | – | – | – | – |
10.5 | 114.3 | 5.69 | PSB | – | – | – | – | – | |
11.6 | 114.3 | 6.36 | PSLB | PLB | PLB | PLB | PLB | – | |
13.5 | 114.3 | 7.37 | – | PLB | PLB | PLB | PLB | – | |
15.1 | 114.3 | 8.56 | – | – | – | – | PLB | PLB | |
5 | 11.5 | 127 | 5.59 | PS | – | – | – | – | – |
13 | 6.43 | PSLB | – | – | – | – | – | ||
15 | 7.52 | PSLBE | PLBE | PLBE | PLBE | PLBE | – | ||
18 | 9.19 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
21.4 | 11.10 | – | PLB | PLB | PLB | PLB | PLB | ||
23.2 | 12.14 | – | PLB | PLB | PLB | PLB | PLB | ||
24.1 | 12.7 | – | PLB | PLB | PLB | PLB | PLB | ||
5 1/2 | 14 | 139.7 | 6.20 | PS | – | – | – | – | – |
15.5 | 6.98 | PSLBE | – | – | – | – | – | ||
17 | 7.72 | PSLBE | PLBE | PLBE | PLBE | PLBE | – | ||
20 | 9.17 | – | PLBE | PLBE | PLBE | PLBE | – | ||
23 | 10.54 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
26.8 | 12.7 | – | – | – | P | – | – | ||
29.7 | 14.27 | – | – | – | P | – | – | ||
32.6 | 15.88 | – | – | – | P | – | – | ||
35.3 | 17.45 | – | – | – | P | – | – | ||
38 | 19.05 | – | – | – | P | – | – | ||
40.5 | 20.62 | – | – | – | P | – | – | ||
43.1 | 64.14 | – | – | – | P | – | – | ||
6 5/8 | 20 | 168.28 | 7.32 | PSLB | |||||
24 | 8.94 | PSLBE | PLBE | PLBE | PLBE | PLBE | – | ||
28 | 10.59 | – | PLBE | PLBE | PLBE | PLBE | – | ||
32 | 12.06 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
7 | 20 | 177.8 | 6.91 | PS | |||||
23 | 8.05 | PSLBE | PLBE | PLBE | PLBE | – | – | ||
26 | 9.19 | PSLBE | PLBE | PLBE | PLBE | PLBE | – | ||
29 | 10.6 | PLBE | PLBE | PLBE | PLBE | ||||
32 | 11.51 | PLBE | PLBE | PLBE | PLBE | ||||
35 | 12.65 | PLBE | PLBE | PLBE | PLBE | PLBE | |||
38 | 13.72 | PLBE | PLBE | PLBE | PLBE | PLBE | |||
7 5/8 | 26.4 | 193.67 | 8.33 | PSLBE | PLBE | PLBE | PLBE | – | – |
29.7 | 9.52 | – | PLBE | PLBE | PLBE | PLBE | – | ||
33.7 | 10.92 | – | PLBE | PLBE | PLBE | PLBE | – | ||
39 | 12.7 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
42.8 | 14.27 | – | PLB | PLB | PLB | PLB | PLB | ||
45.3 | 15.11 | – | PLB | PLB | PLB | PLB | PLB | ||
47.1 | 15.88 | – | PLB | PLB | PLB | PLB | PLB | ||
8 5/8 | 24 | 219.08 | 6.71 | PS | – | – | – | – | – |
28 | 7.72 | – | – | – | – | – | – | ||
32 | 8.94 | PSLBE | – | – | – | – | – | ||
36 | 10.16 | PSLBE | PLBE | PLBE | PLBE | – | – | ||
40 | 11.43 | – | PLBE | PLBE | PLBE | PLBE | – | ||
44 | 12.70 | – | PLBE | PLBE | PLBE | PLBE | – | ||
49 | 14.15 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
9 5/8 | 36 | 244.48 | 8.94 | PSLB | – | – | – | – | – |
40 | 10.03 | PSLBE | PLBE | PLBE | PLBE | – | – | ||
43.5 | 11.05 | – | PLBE | PLBE | PLBE | PLBE | |||
47 | 11.99 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
53.5 | 13.84 | – | PLBE | PLBE | PLBE | PLBE | PLBE | ||
58.4 | 15.11 | – | PLB | PLB | PLB | PLB | PLB | ||
10 3/4 | 40.5 | 273.05 | 8.89 | PSB | – | – | – | – | – |
45.5 | 10.16 | PSBE | – | – | – | – | – | ||
51 | 11.43 | PSBE | PSBE | PSBE | PSBE | PSBE | – | ||
55 | 12.57 | – | PSBE | PSBE | PSBE | PSBE | – | ||
60.7 | 13.84 | – | – | – | PSBE | PSBE | PSBE | ||
65.7 | 15.11 | – | – | – | PSB | PSB | PSB | ||
113/4 | 47 | 298.45 | 9.53 | PSB | – | – | – | – | – |
54 | 11.05 | PSB | – | – | – | – | – | ||
60 | 12.42 | PSB | PSB | PSB | PSB | PSB | PSB | ||
13 3/8 | 48 | 339.72 | 8.38 | – | – | – | – | – | – |
54.5 | 9.65 | PSB | – | – | – | – | – | ||
61 | 10.92 | PSB | – | – | – | – | |||
68 | 12.19 | PSB | PSB | PSB | PSB | PSB | – | ||
72 | 13.06 | – | PSB | PSB | PSB | PSB | PSB | ||
16 | 75 | 406 | 11.13 | PSB | – | – | – | – | – |
84 | 12.57 | PSB | – | – | – | – | – | ||
109 | 16.66 | P | P | P | – | P | P | ||
20 | 94 | 508 | 11.13 | PSLB | – | – | – | – | – |
30 | 96 | 762 | 16.13 | PSLB | – | – | – | – | – |
P-Plain end; S-Short round thread; L-Long round thread; B-Buttress thread; E-Extreme line; | |||||||||
API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells
Mechanical Properties
Grade | 类型Type | Total elongation under load % | Yield Strength M pa | Tensile strength min Mpa | Hardness | Specified wall thickness mm | Allowable hardness variation | ||
HRC | |||||||||
min | max | HRC | HBW | ||||||
J55 | – | 0.5 | 379 | 552 | 517 | – | – | – | – |
K55 | – | 0.5 | 379 | 552 | 655 | – | – | – | – |
N80 | 1 | 0.5 | 552 | 758 | 689 | – | – | – | – |
Q | 0.5 | 552 | 758 | 689 | – | – | – | – | |
M65 | – | 0.5 | 448 | 586 | 586 | 22 | 235 | – | – |
L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | – | – |
9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | – | – | |
13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | – | – | |
C90 | 1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | ≤12.70 | 3.0 |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | 12.71-19.04 | 4.0 | |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | 19.05-25.39 | 5.0 | |
1、2 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | ≥25.4 | 6.0 | |
C95 | – | 0.5 | 655 | 724 | 724 | – | – | – | – |
T95 | 1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | ≤12.70 | 3.0 |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | 12.71-19.04 | 4.0 | |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | 19.05-25.39 | 5.0 | |
1、2 | 0.5 | 655 | 724 | 724 | 25.4 | 255 | ≥25.4 | 6.0 | |
P110 | – | 0.6 | 758 | 965 | 862 | – | – | – | – |
Q125 | All | 0.65 | 862 | 1034 | 931 | b | – | ≤12.70 | 3.0 |
All | 0.65 | 862 | 1034 | 931 | b | – | 12.71-19.04 | 4.0 | |
All | 0.65 | 862 | 1034 | 931 | b | – | ≥19.05 | 5.0 | |
Chemical Composition
Standard | Grade | Composition（%） | ||||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | AIs | ||
API SPEC 5CT | J55 | 0.34～0.39 | 0.20～ | 1.25～1.50 | ≤0.020 | ≤0.015 | ≤0.15 | ≤0.20 | ≤0.20 | ≤0.020 | ||
K55· | ||||||||||||
N80 | 0.34～0.38 | 0.20～ | 1.45～1.70 | ≤0.020 | ≤0.015 | ≤0.15 | / | / | / | 0.11 | ≤0.020 | |
L80 | 0.15～0.22 | ≤1.00 | 0.25～1.00 | ≤0.020 | ≤0.010 | 12.0～ | ≤0.20 | ≤0.20 | / | / | ≤0.020 | |
P110 | 0.26～0.35 | 0.17～ | 0.40～0.70 | ≤0.020 | ≤0.010 | 0.80～ | ≤0.20 | ≤0.20 | 0.15 | ≤0.08 | ≤0.020 | |