A quick guide to Incoloy

The Incoloy 825 pipe is highly corrosion resistant. It has a high content of nickel, enough to withstand chloride ion stress corrosion cracking and a very robust austenite structure. The molybdenum and copper levels allow the alloy to withstand reducing agents and acids. Chromium provides resistance to oxidizing conditions, such as solutions for nitric acid, nitrates, and oxidizing salts. The alloy is stabilized titanium to withstand pitting and intergranular attack after manufacture, particularly welding, which requires heating in the critical temperature range of sensitization (650 ° C – 760 ° C).

Alloy 825 provides excellent corrosion resistance by sulphuric and phosphoric acids and is also the most cost-effective alloy serving sulphuric acids. This alloy can be supplied by Austral Wright Metals as plate, sheet, string, bar, pin, wire, tube, pipe, fittings, fasteners.

A guide to Incoloy 825 Pipe

For pressure vessel operating temperatures of up to 525 ° C (AS1210, AS4041), 538 ° C (ASME Boiler & Pressure Vessel Code, Sections I, III, VIII, IX, Cases 1936, N-188) is authorized Incoloy 825. The Brittle phases which form at temperatures above ~540 ° C in alloy 825, so it is typically not used at those temperatures where the creep-rupture properties are design factors.

Corrosion resistance

The outstanding characteristic of Incoloy 825 is its resistance to corrosion. In color, 825 is resistant to general corrosion, pitting & crevice corrosion, intergranular corrosion, and stress corrosion cracking in reducing & oxidizing conditions. In sulphuric & phosphoric acids, sulfur-containing flue gases, sour gas and oil wells, and seawater, it is especially useful.


Incoloy 825 can operate easily hot or cold. Hot work should be in the 870-1180 ° C range, finishing at 870-980 ° C. Before use, hot-worked pieces should be cooled before use for optimum corrosion resistance. The alloy reacts more readily too cold than stainless steel.

Alloy 825 contains > 40 percent Ni which ensures corrosion cracking resistance against stress. Regulated adding titanium prevents intergranular corrosion, which could otherwise occur at high temperatures. Additions of molybdenum and copper allow it to withstand a reduction in environments such as sulphuric and phosphoric acids, hence its widespread usage in various end uses of the chemical process industry.

A bit more about Incoloy 800 Tube

It is used in Oil and Gas wellheads, risers, pipes, casing, and tubing because of the combination of strong corrosion resistance and working temperature range.

Chemical process industry applications include thermowells and monitors, pump and valve components, hydrogen and ethylene furnaces, and fertilizer and ammonia plant components. Typical components include vessels for seawater handling, ammonium sulfate, pickling acids, sulphuric and phosphoric acids.

The best material of Incoloy 825 Tube

Incoloy 825 Tube is also certified for operating temperatures of pressure vessels up to 525 ° C (AS1210, AS4041), 538 ° C (ASME Boiler & Pressure Vessel Code, Sections I, III, VIII , IX, Cases 1936, N-188)In Alloy 825, Brittle phases can form at temperatures above ~540 ° C, so they are not usually used at these temperatures, where the creep-rupture properties are design factors.

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