Annealed Nickel Alloy Incoloy 825 Tubing , UNS N08825 Round Steel Tubing
Description
Nickel Alloy 825 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. Alloy 825 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.
Application
Nickel Alloy 825 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.
Nickel Alloy 825, 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%
Meilong is a supplier of welded and redrawn, seamless and redrawn coiled tubing which are made from corrosion-resistant austenitic, duplex, super duplex stainless steels and nickel alloy grades. We have been specializing in manufacturing coiled tubing used in the oil and gas industry.
Tubing for Control Lines
A direct hydraulic control umbilical provides direct hydraulic control of each valve on a subsea christmas tree, through a bundle of tubes from the topsides hydraulic power unit (HPU) to the subsea tree. No electrical power or signal is required. Actuation of valves is by the supply of hydraulic power to the relevant tube. This is accomplished by opening the relevant valve on the manifold located on the topsided HPU. This type of umbilical is limited to subsea production systems with short offsets to the host and few trees.
Thanks to the experience and expertise gained in the production and inspection, the tubes supplied by Meilong fully meet stringent quality requirements of the oil & gas industries. The tubing deployed in the umbilicals used in aggressive subsea and downhole conditions.
Tubing for Chemical Injection
One of the main challenges in the upstream processes of the oil and gas industry is to protect pipeline and process equipment against waxes, scaling and asphalthane deposits. The engineering disciplines involved in flow assurance play an essential part in mapping the requirements that reduce or prevent loss of production due to pipeline or process equipment blockage. Steel tubing from Meilong is applied to umbilicals and chemical injection systems play an effective role in chemical storage and delivery at an optimizing flow assurance.
Our tubing is characterized with integrity and quality to be specially used in subsea conditions in the industries of oil and gas extraction.
Manufacturing Process and Resultant Properties
Strip splice welds join lengths of cold rolled strip to enable long lengths between orbital welds (greater than 14,500 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 plug-redrawn to an intermediate outside diameter, heat treated, and make the same process circulation to achieve the desired size and length.
Nondestructive Testing (NDT)
Eddy current testing (ECT) is performed on the longitudinally seam welded tubing and strip splice welds at intermediate size in the as-heat treated condition. Those strip splice welds detected by ECT at intermediate size in the as-heat treated condition. Yield pressure hydro static testing is performed on the heat treated tubing at final size.
Quality Assurance
Eddy current test (ECT)
Ultrasonic test
Hydrostatic test
Chemical composition analysis
Tensile test
Hardness test
Dimension & visual inspect
Metallographic analysis
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.
Coiled Tubing Size
| Imperial size | Metric size |
| OD inch | WT inch | OD mm | WT mm |
| 1/8 (0.125) | 0.028 | 3.18 | 0.71 |
| | 0.035 | 3.18 | 0.89 |
| 3/16 (0.188) | 0.028 | 4.76 | 0.71 |
| | 0.035 | 4.76 | 0.89 |
| | 0.049 | 4.76 | 1.24 |
| 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 |
| 3/4 (0.75) | 0.065 | 19.05 | 1.65 |
| | 0.083 | 19.05 | 2.11 |
| 1 | 0.065 | 25.4 | 1.65 |
| | 0.083 | 25.4 | 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 | |
Product Tags:
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Annealed Nickel Alloy Incoloy 825 Tubing , UNS N08825 Round Steel Tubing Images
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