API 5CT K55 casing is one of the most cost‑effective OCTG grades widely used for oil, gas and water injection wells. Manufactured by Baotou Steel, this seamless casing meets API 5CT requirements with stable chemical limits and consistent mechanical performance: yield strength 379–552 MPa and minimum tensile strength ≥655 MPa.
We supply a full range of K55 casing sizes with STC, LTC and BTC thread connections. Every batch is subject to hydrostatic pressure testing, NDT and dimensional inspection to ensure wellbore integrity. It is an ideal option for non‑corrosive, shallow to medium‑depth well projects worldwide.
- Casing, Tubing & Casing Pipe
API 5CT K55 Casing Pipe OCTG Seamless Casing
Email:
sales@imristeel.com
Phone:
+86 13646172523
Quote Now
Product Detail
Chemical Component
Related Products
Product Detail
Product Name:
API 5CT K55 Casing Pipe OCTG Seamless Casing
Standard:
API 5CT / API 5B
Grade:
K55
Thickness:
3.5-60mm
Shape:
Round
Outer Diameter:
Ф114.3 – 406 mm
Place of Origin:
Inner Mongolia, China
Usage:
Transportation of oil and gas
Surface Treatment:
Hot Rolled
Tolerance:
WT: -12.5% / +15%
End:
Plain
End Protector:
HDPE crash cap or customized
length:
R1, R2, R3
Brand:
Baotou steel
Delivery Time:
Normally within 30-45 days and according to the quantity.
Chemistry Component
| Grade | Type | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | ||||
| Min | Max | Min | Max | Min | Max | Min | Max | Max | Max | Max | Max | Max | ||
| H40 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| J55 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| K55 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| N80 | 1 | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – | |
| N80 | Q | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| R95 | – | – | 0.45 | – | 1.90 | – | – | – | – | – | – | 0.030 | 0.030 | 0.45 |
| L80 | 1 | – | 0.43 | – | 1.90 | – | – | – | – | 0.25 | 0.35 | 0.030 | 0.030 | 0.45 |
| L80 | – | – | 0.15 | 0.30 | 0.60 | 0.90 | 1.10 | 8.00 | 10.0 | 0.50 | 0.25 | 0.020 | 0.010 | 1.00 |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1.00 | – | – | 12.0 | 14.0 | 0.50 | 0.25 | 0.020 | 0.010 | 1.00 |
| C90 | 1 | – | 0.35 | – | 1.20 | 0.25 | 0.85 | – | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
| T95 | 1 | – | 0.35 | – | 1.20 | 025 | 0.85 | 0.40 | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
| C110 | – | – | 0.35 | – | 1.20 | 0.25 | 1.00 | 0.40 | 1.50 | 0.99 | – | 0.020 | 0.005 | – |
| P110 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| Q125 | 1 | – | 0.35 | – | 1.35 | – | 0.85 | – | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
Mechanical Propert
| Grade | Type | Total under load Elongation % | Yield strength megapascal | Tensile strength megapascal | Hardness a, C Maximum | Specified OD mm | Allowable hardness Variation | ||
| Min | Max | Min | HRC | HBW | HRC | ||||
| H40 | – | 0.5 | 276 | 552 | 414 | – | – | – | – |
| J55 | – | 0.5 | 379 | 552 | 517 | – | – | – | – |
| K55 | – | 0.5 | 379 | 552 | 655 | – | – | – | – |
| N80 | 1 | 0.5 | 552 | 758 | 689 | – | – | – | – |
| N80 | Q | 0.5 | 552 | 758 | 689 | – | – | – | – |
| R95 | – | 0.5 | 655 | 758 | 724 | – | – | – | – |
| L80 | 1 | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 3Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
|
C90 |
– |
0.5 |
621 |
724 |
689 |
25.4 |
255 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05 to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
|
T95 |
– |
0.5 |
655 |
758 |
724 |
25.4 |
255 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05 to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
|
C110 |
– |
0.7 |
758 |
828 |
793 |
29 |
279 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05o to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
| P110 | – | 0.6 | 758 | 965 | 862 | – | – | – | – |
| Q125 | – | 0.65 | 862 | 1034 | 931 | b | – | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| ≥19.05 | 5.0 | ||||||||
Color Discrimination
| Grade | Type | Straps for products longer than 1.8 meters Quantity and color | Coupling color | |
| The whole coupling | Brand | |||
| H40 | No belt or black belt, to be selected by the manufacturer | not have | Same as for the pipeline | |
| J55 | A sea of green | Bright green | One white | |
| K55 | Two emerald green | Bright green | not have | |
| N80 | 1 | One red | red | not have |
| N80 | Q | One is red, the other emerald green | red | green |
| R95 | One brown | brown | not have | |
| L80 | 1 | One red, one brown | red | One brown |
| L80 | 3Cr | One red and one white | red | One white |
| L80 | 9Cr | One red, one brown, two yellow | not have | Two yellows |
| L80 | 13Cr | One red, one brown and one yellow | not have | One yellow |
| C90 | A purple one | purple | not have | |
| T95 | One silver | silvery | not have | |
| C110 | One white, two brown | white | Two brown | |
| P110 | One white | white | not have | |
| Q125 | One orange | orange | not have | |
Related products
Premium 136RE HH Grade Railway Rail
Read More 
API 5CT N80-1 Tubing Pipe With LTC Thread
Read More
API 5CT L80-1 Oil Casing for Sour Service
Read More
GB/T 3077-2015 Seamless Alloy Pipe 35CrMo Performance
Read More
GB/T 5310-2017 Seamless Alloy Steel Pipe 12Cr1MoV
Read More
API 5CT K55 Tubing With LC Thread Connection
Read More
GB/T 3077-2015 20Cr Seamless Alloy Steel Pipe
Read More
GB/T 17396 27SiMn Hydraulic Prop Pipe
Read More