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Incoloy 825 (UNS N08825) is a nickel-iron-chromium austenitic alloy. By adding elements such as molybdenum, copper and titanium, it has excellent corrosion resistance, high temperature strength and processing performance. The material is designed to cope with complex corrosive environments (such as the coexistence of acidic, oxidizing and reducing media) and is widely used in the chemical industry, marine engineering and energy fields.
ASME SB 424 UNS N08825 plate supplier
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Chemical composition of Incoloy 825
The chemical composition of Incoloy 825 is based on nickel (38–46%), supplemented by chromium (19.5–23.5%), molybdenum (2.5–3.5%), copper (1.5–3.0%) and iron (balance), and titanium (0.6–1.2%) is added as a stabilizing element.
Physical and mechanical properties of Alloy 825 Plate
Incoloy 825 has a density of 8.14 g/cm3, a melting point range of 1370–1400°C, and a thermal expansion coefficient (20–100°C) of 14.2 μm/m·°C. Typical mechanical properties of annealed sheets include tensile strength ≥586 MPa, yield strength ≥241 MPa, elongation ≥30%, and hardness ≤200 HB. Its high temperature strength can still maintain more than 70% of the room temperature strength at 540°C, making it suitable for manufacturing high temperature and high pressure equipment.
Cold forming of incoloy alloy 825
Annealed sheets can be cold processed by stamping, bending, etc., but intermediate annealing (980–1030°C, water cooling) is required when the deformation exceeds 15% to avoid cracks caused by cold work hardening.
Hot working process of alloy 825 uns n08825
The hot forging or hot rolling temperature is recommended to be controlled at 1150–1200°C, and the final forging temperature is not less than 900°C. Rapid cooling is required after processing to prevent carbide precipitation.
Welding of 2.4858 alloy 825
GTAW (argon arc welding) or SMAW (manual arc welding) is recommended, and ENiCrMo-3 or Inconel 625 welding wire is selected as welding material. Low heat input (≤1.5 kJ/mm) is required during welding, and the interlayer temperature is controlled below 150°C. No heat treatment is required after welding, but pickling is required to remove the oxide scale.
Performance comparison with similar materials
VS 316L stainless steel: Incoloy 825 has a corrosion resistance of more than 10 times in an acidic environment containing chloride ions, but the cost is about 4–5 times that of 316L.
VS Hastelloy C276: C276 performs better in strong reducing acids (such as hydrochloric acid), but Incoloy 825 is more cost-effective in oxidation-reduction mixed media (such as sulfuric acid + nitric acid).
VS 254 SMO super stainless steel: 254 SMO has a higher PREN value (≥43), but Incoloy 825 has more outstanding high temperature strength and resistance to sulfide stress corrosion.
