Alloy 825 / Incoloy 825
Alloy 825 is a nickel-iron-chromium alloy containing molybdenum, copper and titanium. It is used where resistance to reducing acids, pitting, intergranular attack and stress-corrosion cracking is required.
Alloy 825 / Incoloy 825 Information
Alloy 825 is a nickel-iron-chromium alloy containing molybdenum, copper and titanium. It is used where resistance to reducing acids, pitting, intergranular attack and stress-corrosion cracking is required.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | N08825 |
|---|---|
| Correct Trade Family | INCOLOY alloy 825 |
| Material Type | Ni-Fe-Cr-Mo-Cu corrosion-resistant alloy |
| Common / Applicable Specification | ASTM B424 (plate/sheet/strip) |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Alloy 825 / Incoloy 825 Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Nickel | Ni | 38.0–46.0 |
| Chromium | Cr | 19.5–23.5 |
| Iron | Fe | 22.0 min. |
| Molybdenum | Mo | 2.5–3.5 |
| Copper | Cu | 1.5–3.0 |
| Titanium | Ti | 0.6–1.2 |
| Carbon | C | 0.05 max. |
| Manganese | Mn | 1.0 max. |
| Silicon | Si | 0.50 max. |
Alloy 825 / Incoloy 825 Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | 586 min. | MPa |
| 0.2% Offset Yield Strength | 241 min. | MPa |
| Elongation | 30 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Alloy 825 / Incoloy 825 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 8.14 g/cm³ |
|---|---|
| Structure | Austenitic Ni-Fe-Cr alloy |
| Corrosion Behaviour | Good resistance to sulfuric and phosphoric acids and many chloride-containing environments. |
| Heat Treatment | Normally solution annealed. |
| Service Selection | Confirm actual acid concentration, temperature and contamination before selection. |
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