API 5CT J55 Casing: Specification, Applications, Pricing Guide & RFQ Support
API 5CT J55 casing is a low-strength OCTG (Oil Country Tubular Goods) grade manufactured in accordance with the latest API Specification 5CT and ISO 11960 standards. It is widely used in shallow, low-pressure oil, gas, water, and geothermal wells, where cost efficiency and basic structural integrity are the primary procurement requirements.
For quotation, stock availability, or MTC documents, please submit your inquiry at the end of this page.
1. What Is API 5CT J55 Casing?
J55 is a Group 1 carbon steel casing grade defined under API 5CT.
The designation "55" represents a minimum yield strength of 55 ksi (379 MPa).
It is designed for:
- Shallow oil & gas wells
- Low-pressure formations
- Water wells and geothermal wells
- Non-corrosive (non-H₂S) environments
J55 is commonly used as:
- Casing (wellbore structural support)
- Tubing (production string inside casing)
2. Mechanical Properties (API 5CT Standard)
| Property | Value |
|---|---|
| Yield Strength | 379 – 552 MPa |
| Minimum Tensile Strength | ≥ 517 MPa |
| Elongation | API 5CT formula-based |
| Hardness | ≤ 197 HB |
3. Chemical Composition (Controlled Elements Only)
API 5CT does not define fixed chemical composition for J55.
| Element | Requirement |
|---|---|
| P (Phosphorus) | ≤ 0.030% |
| S (Sulfur) | ≤ 0.030% |
| C / Mn / Si | Controlled by manufacturer to achieve required mechanical properties |
| Cr / Ni / Cu | Trace residual elements with strict upper limits |
4. Dimensions, Weight & Length Standards
| Item | Specification |
|---|---|
| OD Range | 4 1/2" – 13 3/8" |
| Larger OD (welded application) | up to 16" (water well/civil use) |
| Wall Thickness | 3.18 – 16.13 mm |
| Weight Range | API 5CT dimensional table (varies by OD & WT) |
Standard Lengths
| Range | Length |
|---|---|
| R1 | 4.88 – 7.62 m |
| R2 | 7.62 – 10.36 m |
| R3 | 10.36 – 14.63 m |
Custom cutting available according to project drawings.
Check Stock Availability & Delivery Time for Your Project Now
5. Thread Types (API 5B Standard)
- STC (Short Thread Casing)
- LTC (Long Thread Casing)
- BTC (Buttress Thread Casing)
- Premium connections (custom engineered systems)
All connections must comply with API 5CT dimensional and coupling compatibility requirements.
6. Manufacturing Types
Seamless J55 Casing (Recommended for Oil & Gas)
- No weld seam
- Higher structural integrity
- Preferred for drilling operations
- Common for PSL2 requirements
Welded J55 Casing (ERW / LSAW)
- Lower cost option
- Used mainly for water wells & civil engineering
- Requires strict weld seam inspection and qualification testing
7. PSL1 vs PSL2
PSL defines product specification requirements including inspection, testing frequency, and traceability, not only inspection level.
| Item | PSL1 | PSL2 |
|---|---|---|
| NDT | Visual inspection | Full UT / EMI / MPI |
| Impact Test | Not required | Required (project specified) |
| Traceability | Basic | Full heat number traceability |
| Application | Water wells | Oil & gas drilling projects |
8. API Tolerances
| Item | Tolerance |
|---|---|
| Outer Diameter | ±0.79 mm / ±1% |
| Wall Thickness | -12.5% only |
| Weight per pipe | +6.5% / -3.5% |
Negative wall thickness tolerance is strictly controlled per API 5CT.
9. Applications & Limitations
Applications
- Shallow oil & gas wells
- Water wells
- Low-pressure gas wells
- Geothermal wells
- Foundation casing projects
Limitations
J55 is NOT suitable for:
- Deep or high-pressure wells
- H₂S / CO₂ corrosive environments
- High collapse load formations
- Thermal recovery wells
10. Why Choose J55 Casing Pipe
- Lowest-cost API casing grade for shallow wells
- Good machinability and threading performance
- Fully compatible with API standard accessories
- Stable global availability and fast delivery
- Suitable for large-scale water well projects
11. RFQ Guide
To provide accurate pricing, please confirm:
- Outer diameter & wall thickness
- Thread type (STC / LTC / BTC)
- PSL level (PSL1 or PSL2)
- Quantity (tons or meters)
- Delivery term (FOB / CIF / EXW)
- Destination port
MOQ: 1 × 20GP container (approx. 25–27 tons)
Delivery time: 15–45 days depending on specification & stock
12. Quality Assurance & Certification
We provide full documentation support:
- API 5CT monogram license products
- ISO 9001 certified manufacturing system
- EN 10204 3.1 Mill Test Certificate (MTC)
- Heat number traceability reports
- Third-party inspection (SGS / BV / TUV available)
13. Frequently Asked Questions (FAQ)
Q1: What is the difference between J55 and K55?
J55 and K55 share the same yield strength range, but K55 may have higher tensile performance depending on manufacturing control and specification requirements.
Q2: Can J55 be used as tubing?
Yes. J55 is applicable for both casing and tubing applications in shallow wells.
Q3: Is PSL2 necessary?
For oil & gas drilling projects, PSL2 is strongly recommended due to stricter inspection and traceability.
Q4: Is welded J55 acceptable?
Yes for water wells, but seamless casing is preferred for oil & gas drilling applications.
Q5: Can J55 be used in sour service wells?
No. Use L80 or CRA corrosion-resistant grades instead.
Q6: How to verify J55 casing upon delivery?
Check API color coding, dimensional tolerance, and verify MTC 3.1 certificate with heat number traceability.
14. Get a Quote (RFQ / Inquiry)
If you are sourcing API 5CT J55 casing pipe for oil, gas, water, or geothermal projects, please send us your requirements.
We will provide:
✔ Competitive factory pricing within 12–24 hours
✔ Technical datasheet & API specification confirmation
✔ MTC sample report
✔ Stock availability & lead time
✔ Shipping cost to destination port
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