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For precision capillary tube of metal materials, we have been working on it for more than 30 years.
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Alloy 28Material
Alloy 28, 28Cr, UNS N08028, W.Nr. 1.4563
Overview
Alloy 28, is a cold hardened nickel-based alloy intended for corrosion resistance in highly sour (H2S) environments with moderate chloride content, requiring high strength up to 350°F.Alloy28 offers increased resistance to the effects of H2S relative to stainless steels allowing its use as downhole tubular components, packers, and other subsurface equipment in sour wells with high-pressure and high-temperature (HPHT) conditions and Acid Gas Injection (AGI) wells. In addition, it has a high resistance to pitting and crevice corrosion in the presence of chlorides. However, all environmental factors, including H2S, CO2, temperature, pH, and chloride concentration, should be considered before final material selection.
Application
Alloy 28 is used in the chemical and petrochemical processing industry. Alloy 28 tubes are cold worked to high strength levels for downhole service in moderately corrosive deep sour gas wells.
Chemical Composition (wt% as per ASTM B622)
Material |
Fe |
Ni |
Cu |
Cr |
Mo |
Alloy 28 |
Balance |
30.0-34.0 |
0.6-1.4 |
26.0-28.0 |
3.0-4.0 |
Material |
C |
Mn |
Si |
P |
S |
Alloy 28 |
≤0.03 |
≤2.5 |
≤1.0 |
≤0.030 |
≤0.030 |
Mechanical Property
Alloy 28 in the solution annealed condition as per ASTM B668
Material |
Tensile strength ksi (MPa) |
Yield strength at 0.2 offset ksi (MPa) |
Elongation in 2” % min. |
Reduction of area % min. |
N08028 |
≥73 (500) |
≥31 (214) |
≥40 |
|
Available Process
(1) Hot formed, annealed, descaled
(2) Cold worked and bright annealed
(3) Cold worked, bright annealed, polished (MP, EP, CP etc.)
Common Tests
Chemical composition
Tension
Hardness
Flaring
Flange
Flattening
Micro structure
Hydrostatic
NDT
Intergranular Corrosion
Surface condition
Shape and dimension
Positive Material Identification
Product Forms
Form |
Size range |
Capillary tube |
OD 0.15 ~ 6.0 mm WT 0.015 ~ 1.5 mm |
Thin wall & Ultra thin wall seamless tube |
OD6.0 ~80.0 mm WT 0.05 ~4.5 mm |
Micro ID and heavy thick wall seamless tube |
OD3.0 ~50.0 mm ID 0.30 ~5.0 mm |
Precision conic seamless tube |
Bigger end: OD3.0 - 426.0mm Smaller end: OD2.5 - 346.0mm WT: 0.15 - 40.0mm |
HP /UHP BA+ tube EP tube |
OD 1.0 ~ 76 mm WT 0.10 ~ 10.0 mm |
Small caliber precision seamless tube |
OD6.0 ~89 mm WT 0.50 ~9.0 mm |
Profiled seamless tube |
Build to drawing Build to specification |