Suzhou Vanforge Metals Co., Ltd. |
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Incoloy Alloy UNS 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
Alloy UNS 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 UNS 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. 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.
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 | WT | OD | WT |
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 |