API 5CT C90 Type1 Casing For Sour Service
C90 Type 1 oil casing is a high-strength casing manufactured using a seamless steel pipe production process, primarily utilized in the intermediate-to-deep sections of oil and gas wells. Its core manufacturing process involves hot rolling or cold drawing to form the pipe, followed by quenching and tempering heat treatment to enhance mechanical properties, and finally, precision threading and sealing surface treatment to ensure connection reliability. This process effectively balances the material's compressive strength and corrosion resistance, complies with the API 5CT standard, and is capable of withstanding complex downhole environments.
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API 5CT C90 Type 1 Casing is a high-strength, controlled-yield steel grade specifically engineered for Sour Service (H2S environments). It belongs to Group 2 of the API 5CT specification. The "Type 1" designation refers to a specific chemical and heat-treatment (Quench & Temper) process that ensures the material has a fine-grained, fully martensitic structure, providing maximum resistance to Sulfide Stress Cracking (SSC).
API 5CT C90 Type 1 Specification
| Parameter | Details |
| Standard | API Spec 5CT (ISO 11960) |
| Grade | C90 |
| Type | Type 1 (Cr-Mo alloy) |
| Service Condition | Sour Service (Anti-H2S) / NACE MR0175 compliant |
| Manufacturing Process | Seamless (SML) |
| Heat Treatment | Full length Quenched and Tempered (Q+T) |
| Product Specification Level | PSL1, PSL2, or PSL3 |
API 5CT C90 Type 1 Casing Color Code
In accordance with API 5CT, the identification color for C90 is Purple.
| Grade | Paint Band on Pipe | Paint Band on Coupling |
| C90 Type 1 | Purple (One band) | Purple (Solid color) |
API 5CT C90 Type 1 Chemical Composition (%)
C90 requires a Chromium-Molybdenum (Cr-Mo) alloy base to ensure hardenability and SSC resistance.
| C | Mn | P (max) | S (max) | Si (max) | Cr | Mo | Ni (max) |
| 0.15 - 0.35 | 0.40 - 1.20 | 0.020 | 0.010 | 0.45 | 0.80 - 1.50 | 0.15 - 0.85 | 0.25 |
API 5CT C90 Type 1 Mechanical Properties
The yield strength is strictly capped to ensure the material is not too hard, which would increase the risk of cracking.
| Property | Value (Imperial) | Value (Metric) |
| Yield Strength (min) | 90,000 psi | 621 MPa |
| Yield Strength (max) | 105,000 psi | 724 MPa |
| Tensile Strength (min) | 100,000 psi | 689 MPa |
| Hardness (max) | 25.4 HRC | 255 HBW / 270 HV |
| Elongation | Calculation based on
A=1940×A0.2/U0.9 |
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API 5CT C90 Type 1 Casing Tolerances
| Item | Tolerance |
| Outside Diameter (OD) |
≤4-1/2": ± 0.031" | >4-1/2": -0.5% to +1% OD |
| Wall Thickness | -12.5% (No maximum limit) |
| Weight (Single Joint) | -3.5% to +6.5% |
| Straightness | Max 0.2% of total length |
API 5CT C90 Type 1 Casing Connections
C90 casing is usually provided with standard API threads or high-performance premium connections.
| Connection Type | Abbreviation | Description |
| Short Round Thread | STC | API Standard |
| Long Round Thread | LTC | API Standard (Most common for C90) |
| Buttress Thread | BTC | High tension strength |
| Premium Connection | VAM, Tenaris, etc. | Gas-tight metal-to-metal seals |
API 5CT C90 Type 1 Casing Size Chart (Common Sizes)
| OD (Inches) | Weight (lb/ft) | Wall Thickness (in) | Drift Diameter (in) |
| 4-1/2" | 11.60 / 13.50 | 0.250 / 0.290 | 3.875 / 3.795 |
| 5-1/2" | 17.00 / 20.00 | 0.304 / 0.361 | 4.767 / 4.653 |
| 7" | 26.00 / 29.00 | 0.362 / 0.408 | 6.151 / 6.059 |
| 9-5/8" | 47.00 / 53.50 | 0.472 / 0.545 | 8.525 / 8.379 |
Grade C90 Type 1 Drilling Tube Dimensions (Metric - MM)
| OD (mm) | Wall Thickness (mm) | Internal Diameter (mm) | Drift Diameter (mm) |
| 114.30 | 6.35 / 7.37 | 101.60 / 99.56 | 98.42 / 96.39 |
| 139.70 | 7.72 / 9.17 | 124.26 / 121.36 | 121.08 / 118.19 |
| 177.80 | 9.19 / 10.36 | 159.42 / 157.08 | 156.24 / 153.90 |
| 244.48 | 11.99 / 13.84 | 220.50 / 216.80 | 216.53 / 212.83 |
Testing & Inspection of API 5CT C90 Type 1 Casing
To ensure resistance to H2S, C90 undergoes rigorous quality control.
| Test Name | Requirement | Frequency |
| Hydrostatic Test | Mandatory (100% pipes) | Every joint |
| Tensile Test | Verify Yield/Tensile strength | Once per lot/heat |
| Hardness Test | Crucial (Max 25.4 HRC) | 100% or as per PSL |
| Flattening Test | Checks ductility | Every lot |
| NDT (Non-Destructive) | UT (Ultrasonic) or Magnetic Particle | Mandatory for PSL2/PSL3 |
| SSC Test | NACE TM0177 (Mandatory for Type 1) | Periodic / Per heat |
GNEE API 5CT Gr. C90 Casing Pipes Factory
API 5CT Grade C90 Oil Well Drilling Tube Test and Inspection
FAQ
How to size casing pipe?
The inside diameter of the casing pipe shall be: at least 4-inches greater than the outside diameter of the carrier pipe joints or couplings for carrier pipe less than 6- -inches in diameter; and at least 6-inches greater than the outside diameter of the carrier pipe joints or couplings for carrier pipe 6-inches
What size is API casing?
Common API steel grades for steel casing:
Common sizes of casing include: 4½", 5", 5½", 6⅝", 7", 7⅝", 8⅝", 9⅝", 10¾", 11¾", 13⅜", 16", 18⅝", 20", etc. Common wall thickness series: such as 5.21 mm, 6.35 mm, 7.72 mm, 9.17 mm, 10.36 mm, etc.
What is the standard length of casing pipe?
Manufactured as per IS:12818 standards, the solid wall plain casing pipe and ribbed screen pipe are available in standard length of 3 mts.
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