| After-sales Service: | Support |
|---|---|
| Warranty: | Support |
| Type: | Seamless |
| Technique: | Hot Rolled |
| Material: | Carbon Steel |
| Surface Treatment: | Black |
| Samples: |
|---|
Suppliers with verified business licenses
Audited Supplier 
The special oil pipe is mainly used for drilling oil and gas Wells and conveying oil and gas. Oil casing is mainly used to support the well wall during drilling and after completion to ensure the drilling process and the normal operation of the entire well after completion. The oil casing is the lifeblood of the oil well. Due to different geological conditions, the downhole stress state is complex, and the combined action of tensile, compressive, bending and torsional stress acts on the pipe body, which puts forward higher requirements for the quality of the casing itself. If the casing itself is damaged for some reason, it can lead to the loss of production or even the abandonment of the entire well.
1. Specification range: Outer diameter: 114.3MM-508MM (4 1/2"--20") Wall thickness: 5.21MM-16.13MM(9.5PPF--133PPF)
2. Material: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc
3. Implementation standards: API 5CT, GB, ISO11960, GOST
4. Buckle type categories: STC, LTC, BTC, XC and Premium connection
5. Length: R1, R2, R3
6. Detection: NDT etc related rules of API 5CT and 5B
7. Type: seamless steel pipe, straight seam steel pipe
Chemical compositions of casing pipe
| Standard | Grade | Chemical compositions(%) | |||||||||
| API SPEC 5CT | J55 | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V |
| K55 | 0.34~0.39 | 0.20~0.35 | 1.25~1.50 | ≤0.020 | ≤0.015 | ≤0.15 | ≤0.20 | ≤0.20 | / | / | |
| N80 | 0.34~0.38 | 0.20~0.35 | 1.45~1.70 | ≤0.020 | ≤0.015 | ≤0.15 | / | / | / | 0.11~0.16 | |
| L80 | 0.15~0.22 | ≤1.00 | 0.25~1.00 | ≤0.020 | ≤0.010 | 12.0~14.0 | ≤0.20 | ≤0.20 | / | / | |
| P110 | 0.26~0.395 | 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 | |
| Grade | Type | Total elongation under load (%) |
Yield strength (min)Mpa |
Yield strength (max)Mpa |
Tensile strength min Mpa |
Hardness Max (HRC) |
Hardness Max (HBW) |
| 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 | - | - |
| L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 |
| L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 |
| L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 |
| C90 | - | 0.5 | 621 | 724 | 689 | 25.4 | 255 |
| C95 | - | 0.5 | 655 | 758 | 724 | - | - |
| T95 | - | 0.5 | 655 | 758 | 724 | 25.4 | 255 |
| P110 | - | 0.6 | 758 | 965 | 862 | - | - |
| Q125 | All | 0.65 | 862 | 1034 | 931 | - | - |
Casing Pipe Manufacturing Process:
Steel ingot heating → hydraulic punching → reheating → extension → periodic rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection
1. An annular heating furnace is required for ingot heating;
2. Punching and reheating with hydraulic press;
3. The oil casing plant uses a two-roller guide plate extension machine for extension;
4. Re-use a disc heating furnace for periodic rolling, and use a non-entry furnace for reheating, cooling, straightening, pipe cutting, and inspection.
Q1. How can I request a product sample?
A. The samples are free. We are also responsible for the freight of samples. Please send your adress and your telephone namber by email.
Q2. How can I request a product catalog?
A The hard copies of cataloges are free but freight should be collected. Please send courier account number by email. You are suggested to request a PDF catalog.
Q3. What's your payment terms?
A One is T/T 30% before production and 70% against copy of B/L; the other is irrevocable L/C 100% at sight.
Q4. What's your trade terms?
A FOB, CNF (CFR), CIF, EXW
Q5. When can i receive the goods?
A 20 days of production lead time from receive the down payment, remaining time depends on where the destination port located.
Q6. How long is the quality guarantee?
A. All of our product have a period of quality guarantee since time of shipment. please contact us for more details.
Suppliers with verified business licenses
Audited Supplier 
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