Incoloy Alloy UNS N08825 Encapsulated Control Line Bright Annealed
Seamless
HYDRAULIC CONTROL LINE APPLICATIONS
STAINLESS STEEL AND HIGH NICKEL ALLOYS COILED TUBING SOLUTIONS
MEILONG is an important manufacturer in premium coiled seamless &
welded tubular solutions for oil and gas applications. In an
endeavor to increase its presence in subsea, MEILONG has extended
its offer by developing a highly innovative tubular solution for
umbilical projects.
MEILONG has developed a strong and unique expertise in premium
quality tubes to answer the most stringent specifications of its
customers. Based on this expertise in high pressure, and extremely
high pressure tubes, MEILONG’s state-of-art factory is exclusively
dedicated to the manufacturing and supply of super duplex and high
nickel alloys tubes for corrosive downhole applications and is now
ready to offer the highest specifications for your toughest
challenges.
High quality polymeric jackets/encapsulations provide added
protection
Core tubing is evaporated with the latest thermoplastic elastomeric
compounds designed to outlast the life of most project tubing
installations by reducing the possibility of corrosion and
mechanical damage. They can stand up to a wide range of chemical
inhibitors and seawater. Most jackets are manufactured from fire
retardant, all-weather, abrasion-resistant compound, designed to
remain strong and flexible through wide ranges of temperatures and
pressures.
PVC
PP (polypropylene)
SP (Santoprene)
F46 (FEP)
Nylon
Incoloy Alloy N08825, Chemical composition
| Element | Composition, % |
| Chromium | 19.5-23.5 |
| Nickel | 38.0-46.0 |
| Ferrous | 22.0 min. |
| Molybdenum | 2.5-3.5 |
| Manganese | 1.00 max. |
| Silicon | 0.50 max. |
| Carbon | 0.050 max. |
| Sulfur | 0.030 max. |
| Aluminum | 0.20 max. |
| Titanium | 0.6-1.2 |
| Copper | 1.5-3.0 |
Application: Very good sour well and chloride stress corrosion
cracking resistance.
Tensile strength, min.: 85000psi (586MPa)
Yield strength, min.: 35000psi (240MPa)
Elongation in 2 in., min.: 30%
Application
Incoloy Alloy N08825 seam welded pressure tubing in the heat
treated condition is typically used in oil and natural gas wells
for chemical injection applications. In such applications, it is
commonly reffered to as capillary tubing and is free-hanging
(self-supporting) inside the production casing. The chemicals being
injected are often used to enhance production flow rates, inhibit
corrosion or scaling and/or de-water. The tubing is frequently
supplied as 5,000 to 35,000 ft. coils on a wooden reel, depending
on size.
Description
Incoloy Alloy N08825 is a titanium-stabilized austenitic
nickel-iron-chromium alloy with additions of molybdenum and copper.
The chemical composition of the alloy is listed in Table 1. The
alloy is characterized by good resistance to stress-corrosion
cracking due to its nickel content (38.0 to 46.0) and satisfactory
resistance to pitting and crevice corrosion. Incoloy Alloy N08825
has shown good corrosion resistance in oil and gas production
environments containing hydrogen sulfide, carbon dioxide and
chlorides. Consult ISO 15156-3, Table A.14 for the limits regarding
material type 4c in hydrogen sulfide containing environments for
oil and gas production.
Standards and Specifications
ASTM B704, Standard Specification for Welded UNS N06625, UNS
N06219, and UNS N08825 Alloy Tubes, except in the as-cold worked
condition
ASTM B423, Standard Specification for UNS N08825 Seamless Pipe and
Tube
Meets the material limits for annealed and cold-worked, solid
solution, nickel-based alloys listed in ISO 15156-3 for material
type 4c in Table A.14.
Production Process
Welded & Redrawn Tubing
Strip splice welds join lengths of cold rolled strip to enable long
lengths between orbital welds (greater than 14,500 ft between
orbital welds is achievable). The strip is formed into a tubular
cross section and longitudinally seam welded using the gas tungsten
arc (GTAW) process. The tubing is first sunk to an intermediate
outside diameter, heat treated, and make the same process to obtain
the desired size.
Seamless & Redrawn Tubing
Seamless extruded tube hollows are drawn or drawn / sunk to final
size to produce seamless tubing coils 500 to 2,000 ft. long,
depending upon the size. The tubing is heat treated and joined by
orbital welding to achieve the desired length. The final material
condition of the tubing is heat treated.
Quality Assurance
Eddy current test (ECT)
Ultrasonic test
Hydrostatic test
Chemical composition analysis
Tensile test
Hardness test
Dimension & visual inspect
Metallographic analysis
Coiled Encapsulated Tubing (Bare Tubing Size)
| Imperial size | Metric size |
OD inch | WT inch | OD mm | WT mm |
| 1/4 (0.250) | 0.035 | 6.35 | 0.89 |
| 0.049 | 6.35 | 1.24 |
| 0.065 | 6.35 | 1.65 |
| 0.083 | 6.35 | 2.11 |
| 3/8 (0.375) | 0.035 | 9.53 | 0.89 |
| 0.049 | 9.53 | 1.24 |
| 0.065 | 9.53 | 1.65 |
| 0.083 | 9.53 | 2.11 |
| 1/2 (0.500) | 0.035 | 12.7 | 0.89 |
| 0.049 | 12.7 | 1.24 |
| 0.065 | 12.7 | 1.65 |
| 0.083 | 12.7 | 2.11 |
| 5/8 (0.625) | 0.049 | 15.88 | 1.24 |
| 0.065 | 15.88 | 1.65 |
| 0.083 | 15.88 | 2.11 |
Tubing length up to 32,808 feet (10,000 m)
For control line, chemical injection line, umbilicals
Available materials
Austenitic: 316L
Duplex: S31803, S32205
Super Duplex: S32750
Nickel alloy: N06625, N08825
Norm Equivalence
| Grade | UNS No | Euro norm | Japanese |
| No | Name | JIS |
| Alloy | ASTM/ASME | EN10216-5 | EN10216-5 | JIS G3463 |
| 316L | S31603 | 1.4404, 1.4435 | X2CrNiMo17-12-2 | SUS316LTB |
| 2205 | S31803 | 1.4462 | X2CrNiMoN22-5-3 | SUS329J3LTB |
| 2507 | S32750 | 1.4410 | X2CrNiMoN25-7-4 | |
| 625 | N06625 | 2.4856 | NiCr22Mo9Nb | |
| 825 | N08825 | 2.4858 | NiCr21Mo | |
