API-American Petroleum Institute.
The American Petroleum Institute, commonly referred to as API,is the largest U.S trade association for the oil and natural gas industry.It claims to represent about 400 corporations involved in production,refinement,distribution, and many other aspects of the petroleum industry.
API 5CT-89 CASING AND TUBING(API 5CT -89 /API5CT-89)
1.Chemical Composition
Grade |
Mfg. Process |
Chemical Composition(%) | ||||||||
C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
H-40 | S,E | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
J-55 | S,E | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
K-55 | S,E | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
N-80 | S,E | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
C-75-1 | S,E | 0.50Max | 0.45Max | 1.90Max | 0.030Max | 0.030Max | 0.50Max | 0.50Max | 0.15~0.40 | Cu 0.50Max |
C-75-2 | S,E | 0.43Max | 0.45Max | 1.90Max | 0.030Max | 0.030Max | – | – | – | – |
C-75-3 | S,E | 0.38Max | – | 0.75~1.00 | 0.030Max | 0.030Max | – | 0.80~1.10 | 0.15~0.25 | – |
C-75-9Cr | S | 0.15Max | 1.00Max | 0.30~0.60 | 0.20Max | 0.010Max | 0.50Max | 8.00~10.0 | 0.90~1.10 | Cu 0.25Max |
C-75-13Cr | S | 0.15~0.22 | 1.00Max | 0.25~1.00 | 0.20Max | 0.010Max | 0.50Max | 12.0~14.0 | – | Cu 0.25Max |
L-80-1 | S,E | 0.43Max | 0.45Max | 1.90Max | 0.030Max | 0.030Max | 0.25Max | – | – | Cu 0.35Max |
L-80-9Cr | S | 0.15Max | 1.00Max | 0.30~0.60 | 0.20Max | 0.010Max | 0.50Max | 8.00~10.00 | 0.90~1.10 | Cu 0.25Max |
L-80-13Cr | S | 0.15~0.22 | 1.00Max | 0.25~1.00 | 0.20Max | 0.010Max | 0.50Max | 12.0~14.0 | – | Cu 0.25Max |
C-90-1 | S | 0.35Max | – | 1.00Max | 0.20Max | 0.010Max | 0.99Max | 1.20Max | 0.75Max | – |
C-90-2 | S | 0.50Max | – | 1.90Max | 0.030Max | 0.010Max | 0.99Max | No Limit | No Limit | – |
C-95 | SpE | 0.45Max | 0.45Max | 1.90Max | 0.030Max | 0.030Max | – | – | – | – |
T-95-1 | S | 0.35Max | – | 1.20Max | 0.20Max | 0.010Max | 0.99Max | 0.40~1.50 | 0.25~0.85 | – |
T-95-2 | S | 0.50Max | – | 1.90Max | 0.030Max | 0.010Max | 0.99Max | – | – | – |
P-105 | S | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
P-110 | S | – | – | – | 0.030Max | 0.030Max | – | – | – | – |
Q-125-1 | S,E | 0.35Max | – | 1.00Max | 0.20Max | 0.010Max | 0.99Max | 1.20Max | 0.75Max | – |
Q-125-2 | S,E | 0.35Max | – | 1.00Max | 0.20Max | 0.20Max | 0.99Max | No Limit | No Limit | – |
Q-125-3 | S,E | 0.50Max | – | 1.90Max | 0.20Max | 0.20Max | 0.99Max | No Limit | No Limit | – |
Q-125-4 | S,E | 0.50Max | – | 1.90Max | 0.030Max | 0.20Max | 0.99Max | No Limit | No Limit | – |
2.Mechanical Properties
Grade | Tensile Test MPa or N/mm2 | Remaks (Similar to JIS) |
Possibility Temperature | |
Min Yield Point | Tensile Strength | |||
H-40 | 276~552 | 414Min | – | |
J-55 | 379~552 | 517Min | – | |
K-55 | 379~552 | 655Min | – | |
N-80 | 552~758 | 689Min | – | |
C-75-1 | 517~620 | 655Min | – | |
C-75-2 | 517~620 | 655Min | – | |
C-75-3 | 517~620 | 655Min | – | |
C-75-9Cr | 517~620 | 655Min | – | |
C-75-13Cr | 517~620 | 655Min | – | |
L-80-1 | 552~655 | 655Min | – | |
L-80-9Cr | 552~655 | 655Min | – | |
L-80-13Cr | 552~655 | 655Min | – | |
C-90-1 | 620~724 | 690Min | – | |
C-90-2 | 620~724 | 690Min | – | |
C-95 | 655~758 | 724Min | – | |
T-95-1 | 655~758 | 724Min | – | |
T-95-2 | 655~758 | 724Min | – | |
P-105 | 724~931 | 827Min | – | |
P-110 | 758~965 | 862Min | – | |
Q-125-1 | 860~1035 | 930Min | – | |
Q-125-2 | 860~1035 | 930Min | – | |
Q-125-3 | 860~1035 | 930Min | – | |
Q-125-4 | 860~1035 | 930Min | – |
OCTG API Plain End Casing Standards : ISO 11960 / API 5CT / 5B Used in : oil and gas exploitation dimensions : according to the table.
Size Designation |
Weight Designation |
OD Diameter |
Wall Thickness | Type of End Finish for Various Frades |
PlainEnd Weight |
|||||||||
4 1/2 | mm | in | mm | in | H40 | J55 | K55 | M65 | N80 | L80 | P110 | Kg/m | lb/ft | |
9.50 | 114.3 | 4.500 | 5.210 | 0.224 | P | P | P | P | – | – | – | 14.02 | 9.41 | |
10.50 | 4.500 | 5.690 | 0.205 | – | P | P | P | – | – | – | 15.24 | 10.24 | ||
5 | 11.50 | 127.00 | 5.000 | 5.690 | 0.220 | – | P | P | P | – | – | – | 16.74 | 11.24 |
13.00 | 6.430 | 0.253 | – | P | P | P | – | – | – | 19.12 | 12.84 | |||
15.00 | 7.520 | 0.296 | – | P | P | P | P | P | P | 22.16 | 14.88 | |||
18.00 | 9.190 | 0.362 | – | – | – | P | P | P | P | 26.70 | 17.95 | |||
5 1/2 | 14.00 | 139.70 | 5.5000 | 6.200 | 0.244 | P | P | P | P | – | – | – | 20.41 | 13.71 |
15.50 | 6.980 | 0.275 | – | P | P | P | – | – | – | 22.85 | 15.36 | |||
17.00 | 7.720 | 0.304 | – | P | P | P | P | P | P | 25.13 | 16.89 | |||
20.00 | 9.170 | 0.361 | – | – | – | P | P | P | P | 29.52 | 19.83 | |||
23.00 | 10.540 | 0.415 | – | – | P | P | P | P | 33.57 | 22.56 | ||||
6 5/8 | 20.00 | 168.28 | 6.625 | 7.320 | 0.288 | – | P | P | P | P | P | – | 29.06 | 19.51 |
24.00 | 8.940 | 0.352 | – | P | P | P | P | P | P | 35.13 | 23.60 | |||
28.00 | 10.590 | 0.417 | – | – | – | P | P | P | P | 41.18 | 27.67 | |||
32.00 | 12.060 | 0.475 | – | – | – | P | P | P | P | 46.46 | 31.23 | |||
7 | 23.00 | 177.8 | 7.000 | 8.050 | 0.317 | – | P | P | P | P | P | – | 33.70 | 22.65 |
26.00 | 9.191 | 0.362 | – | P | P | P | P | P | P | 38.21 | 25.69 | |||
29.00 | 10.360 | 0.408 | – | – | P | P | P | P | 42.78 | 28.75 | ||||
32.00 | 11.510 | 0.453 | – | – | P | P | P | P | 47.20 | 31.70 | ||||
35.00 | 12.650 | 0.498 | – | – | – | P | P | P | 51.52 | 34.61 | ||||
38.00 | 13.720 | 0.540 | – | – | – | – | P | P | P | 55.52 | 37.39 | |||
7 5/8 | 26.40 | 193.68 | 7.625 | 8.330 | 0.300 | – | P | P | P | P | P | – | 38.08 | 25.59 |
29.70 | 9.520 | 0.328 | – | – | P | P | P | P | 43.24 | 29.06 | ||||
33.70 | 10.920 | 0.375 | – | – | – | P | P | P | P | 49.22 | 33.07 | |||
39.00 | 12.700 | 0.430 | – | – | – | – | P | P | P | 56.68 | 38.08 | |||
8 5/8 | 24.00 | 219.80 | 8.625 | 6.710 | 0.264 | – | P | P | P | – | – | – | 35.14 | 23.60 |
28.00 | 7.720 | 0.304 | P | – | – | P | – | – | – | 40.24 | 27.40 | |||
32.00 | 8.940 | 0.352 | P | P | P | P | – | – | – | 46.33 | 31.13 | |||
36.00 | 10.160 | 0.400 | – | P | P | P | P | P | – | 52.35 | 35.17 | |||
40.00 | 11.430 | 0.450 | – | – | – | P | P | P | P | 58.53 | 39.33 | |||
44.00 | 12.700 | 0.500 | – | – | – | – | P | P | P | 64.64 | 43.43 | |||
49.00 | 14.150 | 0.557 | – | – | – | – | P | P | P | 71.51 | 48.04 | |||
9 5/8 | 36.00 | 244.48 | 9.625 | 8.940 | 0.350 | P | P | P | P | – | – | – | 51.93 | 34.89 |
40.00 | 10.030 | 0.395 | – | P | P | P | P | P | – | 57.99 | 38.97 | |||
43.50 | 11.050 | 0.435 | – | – | – | P | P | P | P | 63.61 | 42.73 | |||
47.00 | 11.990 | 0.472 | – | – | – | P | P | P | P | 68.75 | 46.18 | |||
53.50 | 13.840 | 0.545 | – | – | – | – | P | P | P | 78.72 | 52.90 | |||
58.40 | 15.110 | 0.595 | – | – | – | – | P | P | P | 85.47 | 57.44 | |||
10 3/4 | 32.75 | 273.05 | 10.750 | 7.090 | 0.279 | P | – | – | – | – | – | – | 46.50 | 31.23 |
40.50 | 8.890 | 0.350 | P | P | P | P | – | – | – | 57.91 | 38.91 | |||
45.50 | 10.160 | 0.400 | – | P | P | P | – | – | – | 65.87 | 44.26 | |||
51.00 | 11.430 | 0.450 | – | P | P | P | P | P | P | 73.75 | 49.55 | |||
55.50 | 12.570 | 0.495 | – | – | – | P | P | P | P | 80.75 | 54.26 | |||
60.70 | 13.840 | 0.545 | – | – | – | – | – | – | P | 88.47 | 59.45 | |||
65.70 | 15.110 | 0.595 | – | – | – | – | – | P | P | 96.12 | 64.59 | |||
47.00 | 9.530 | 0.375 | – | P | P | P | – | – | – | 69.94 | 45.60 | |||
11 3/4 | 54.00 | 298.45 | 11.750 | 11.050 | 0.435 | – | P | P | P | – | – | – | 78.32 | 52.62 |
60.00 | 12.420 | 0.489 | – | P | P | P | P | P | P | 87.61 | 58.87 | |||
65.00 | 13.560 | 0.534 | – | – | – | – | P | P | P | 95.27 | 64.03 | |||
13 3/8 | 48.00 | 339.72 | 13.375 | 8.380 | 0.330 | P | – | – | – | – | – | – | 68.48 | 46.02 |
54.50 | 9.560 | 0.380 | – | P | P | P | – | – | – | 78.55 | 52.79 | |||
61.00 | 10.920 | 0.430 | – | P | P | P | – | – | – | 88.55 | 59.50 | |||
68.00 | 12.190 | 0.480 | – | P | P | P | P | P | P | 98.46 | 66.17 | |||
72.00 | 13.060 | 0.514 | – | – | – | – | P | P | P | 105.21 | 70.67 |