Nickel Alloy Incoloy 925 UNS N09925
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Incoloy 925 (UNS N09925) is an age hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy's chemical composition is designed to provide a combination of high strength and excellent corrosion resistance. The nickel content is sufficient for protection against chloride-ion stresscorrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy's chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reaction during heat treatment.
Chemical Composition:
| Cr | Ni | Mo | Co | Nb (+Ta) | Ti | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
| Min | 19.5 | 42 | 2.5 | 0.08 | 1.9 | 1.5 | 0.1 | |||||||||
| Max | 22.5 | 46 | 3.5 | 0.5 | 2.4 | 3 | 0.025 | 1 | 0.35 | 0.02 | 0.003 | Bal | 0.5 |
Mechanical Properties:
| 0.2% Proof Stress | 758-965 N/mm2 | 110-140 ksi |
| Tensile Strength | 965 N/mm2 | 140 ksi |
| Elongation, 5.65√S0 and 4D | 18% | |
| Reduction of Area | 25% | |
| Hardness | 38 HRC max. | |
| Impact Strength(-60oC) Longitudinal | 47J av (43J min) | 35 ft.lb av (32 ft.lb min) |
Physical Properties:
| Density (Kg.m-1) | 8080 |
| Magnetic Permeability (20°C) | 1.001 |
| Young's Modulus (N/mm2) | 199 |
| Specific Heat, 20°C (J/(g.K)) | 435 |
| Electrical Resistivity, 20°C (Ω-m) | 1.17x10-6 |
| Electrical Conductivity, 20°C (mΩ/mm2) | 0.25 (1.48% IACS) |
| Thermal conductivity, 20°C (W/(m.K)) | 12 |
| Mean coefficient of thermal expansion, 20-100°C (m/m/K) | 13.2x10-6 |
Properties Of Nickel Alloy 925
- Protection in oxidizing and reducing atmosphere
- Resistance to chloride ion stress-corrosion cracking
- Excellent resistance to pitting and crevice corrosion
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