Product Description
API Spec 5ST Conventional Stainless Coiled Tubing Flexible Tubing
Coiled tubing, also known as flexible tubing or CT, is a long continuous string of tubing spooled on a large reel. Normally it is made from low carbon alloy steel and ranges in diameter from 8 feet to 12feet. Coiled tubing can be straightened prior to being inserted into the wellbore and recoiled to spool back on the reel later.
The reason why CT is enjoying more popularity both home and abroad is that it has the following benefits:
Safe and high operating efficiency
Fewer personnel needed at the site
Easy to operate and save cost
Smaller environmental footprint
Constantly pumping fluids through when running and retrieving the coil
Our company is specialized in the production of coiled tubing of various materials and specifications, products in line with the industry's highest standards. Equipped with rich industry experience and mature production lines, our products are exquisite in workmanship and advanced in technology. Complete in size and specification, our tube can meet various operating conditions.
Our conventional coiled tubing raw material has low content of sulfur and phosphorus, uniform microstructure, suitable mechanical properties, the flexion ratio of steel coil is lower than 0.80, and the strength performance difference of different parts is within 50MPa. All mechanical properties meet API Spec 5ST specification and have excellent fatigue resistance.
The steel grade and size information covered are as follows:
Type: Conventional coiled tubing(CT)
Advantages: high-strength, excellent fatigue resistance.
Reference material: CT70 CT80 CT90 CT110 CT110
Standard: API Spec 5ST
OD: 3/4 " ~ 3 1/2" (19.1 mm to 88.9 mm)
Thickness: 0.075 " ~ 0.3" (1.9mm~7.6mm)
Users can choose the required material and steel grade according to the operating conditions. The dimensions can be customized according to API Spec 5ST or user requirements.
Chemical composition requirements for carbon steel low alloy steel coiled tubing
| Chemical Composition (%) |
| Material |
standard |
C |
Mn |
P |
S |
Si |
| CT70 |
API 5ST |
0.16 |
1.20 |
0.025 |
0.005 |
0.50 |
| CT80 |
0.16 |
1.20 |
0.020 |
0.005 |
0.50 |
| CT90 |
0.16 |
1.20 |
0.020 |
0.005 |
0.50 |
| CT100 |
0.16 |
1.65 |
0.025 |
0.005 |
0.50 |
| CT110 |
0.16 |
1.65 |
0.025 |
0.005 |
0.50 |
Mechanical properties of carbon steel and low alloy steel coiled tubing
| Grade |
Min. Yield strength |
Max. Yield strength |
Min. Tensile strength |
Max. hardness HRC |
| psi |
Mpa |
psi |
MPA |
psi |
Mpa |
tube body &weld seam |
| CT70 |
70,000 |
(483) |
80,000 |
552 |
80,000 |
552 |
22 |
| CT80 |
80,000 |
(552) |
90,000 |
620 |
88,000 |
607 |
22 |
| CT90 |
90,000 |
(620) |
100,000 |
689 |
97,000 |
669 |
22 |
| CT100 |
100,000 |
(689) |
|
|
108,000 |
758 |
28 |
| CT110 |
110,000 |
(758) |
|
|
115,000 |
793 |
30 |
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