| Customization: | Available |
|---|---|
| Application: | Aviation, Electronics, Industrial, Medical, Chemical |
| Standard: | JIS, GB, DIN, ASTM, AISI |
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EN 10095 Standard Bright Finish Incoloy 825 Nickel Based Alloy Rod for Phosphoric acid evaporators
Incoloy 825 is highly resistant to corrosion. It has a high nickel content, sufficient to resist chloride ion stress corrosion cracking, and a very stable austenite structure. The levels of molybdenum and copper enable the alloy to resist reducing agents and acids. Chromium gives resistance to oxidising conditions, such as nitric acid solutions, nitrates and oxidising salts. The alloy is titanium stabilised to resist pitting and intergranular attack after fabrication, particularly welding, which includes heating in the critical sensitisation temperature range (650°C - 760°C).
Incoloy 825 is approved for pressure vessel operating temperatures up to 525°C (AS1210, AS4041), 538°C (ASME Boiler & Pressure Vessel Code, Sections I, III, VIII, IX, Cases 1936, N-188). Brittle phases may form in alloy 825 at temperatures above ~ 540°C, so it is not normally used at these temperatures, where creep-rupture properties would be design factors.
Typical Applications of Incoloy Alloy 825 include:
Table 1. Chemical composition of Incoloy Alloy 825 (ASTM B163 - Heat exchanger tube)
|
Element |
% |
Element |
% |
|
Nickel |
38.0 - 46.0 |
Carbon |
0.05 max |
|
Chromium |
19.5 - 23.5 |
Manganese |
1.0 max |
|
Molybdenum |
2.5 - 3.5 |
Sulfur |
0.03 max |
|
Copper |
1.5 - 3.0 |
Silicon |
0.5 max |
|
Titanium |
0.6 - 1.2 |
Aluminium |
0.2 max |
|
Iron |
22.0 min (~33%) |
Table 2. Typical room temperature tensile properties (not for design. Consult the relevant material or product specification for design values)
|
Form |
Condition |
0.2% Proof Stress |
Tensile Strength |
Elong |
|
Tube |
Annealed |
440 |
770 |
35 |
|
Tube |
Cold drawn |
880 |
1000 |
15 |
|
Bar |
Annealed |
325 |
690 |
45 |
|
Plate |
Annealed |
340 |
660 |
45 |
|
Sheet |
Annealed |
420 |
760 |
39 |
Figure 1. High temperature tensile properties of annealed Incoloy 825 bar.
The outstanding property of Incoloy 825 is its corrosion resistance. In reducing & oxidising conditions, Incoloy 825 resists general corrosion, pitting & crevice corrosion, intergranular corrosion and stress corrosion cracking. It is particularly useful in sulphuric & phosphoric acids, sulphur containing flue gases, sour gas and oil wells and sea water.
Incoloy 825 can be readily hot or cold worked. Hot working should be in the range 870 - 1180°C, finishing at 870 - 980°C. For maximum corrosion resistance hot worked parts should be stabilise annealed before use. The alloy is easier to cold form than stainless steels.
ASTM specifications for Incoloy Alloy 825.
|
Specification |
Title |
|
B163 |
Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes |
|
B423 |
Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* Seamless Pipe and Tube |
|
B424 |
Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip |
|
B425 |
Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825) |
|
B704 |
Welded UNS N06625 and UNS N08825 Alloy Tubes |
|
B705 |
Nickel-Alloy (UNS N06625 and N08825) Welded Pipe |
|
B751 |
General Requirements for Nickel and Nickel Alloy Welded Tube |
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