ncoloy alloy 825 uns n08825 bar Chemical Composition:
| Element | Content Range (wt%) |
|---|---|
| Nickel (Ni) | 38 - 46 |
| Chromium (Cr) | 19.5 - 23.5 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.5 - 3.5 |
| Copper (Cu) | 1.5 - 3.0 |
| Titanium (Ti) | 0.6 - 1.2 |
| Manganese (Mn) | Small amount with specific limits |
| Silicon (Si) | Small amount with specific limits |
| Carbon (C) | Small amount with specific limits |
| Phosphorus (P) | Small amount with specific limits |
| Sulfur (S) | Small amount with specific limits |
| Aluminum (Al) | Small amount with specific limits |
Mechanical Properties: In the annealed state, the typical ultimate tensile strength is not less than 586 MPa (85 ksi), the yield strength (0.2% offset) is not less than 241 MPa (35 ksi), and the elongation is not less than 30%.
| Physical Property | Value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting Point | 1370 - 1400 °C |
| Specific Heat | 0.105 BTU/lb•°F (440 J/kg•°C) |
| Coefficient of Thermal Expansion | 7.7x10⁻⁵ in/in/°F (13.9 mm/m/°C) in the range of 70 - 212 °F (20 - 100 °C) |
| Thermal Conductivity | 6.4 BTU/h - ft - °F (11.1 W/m - °K) at 70 °F (21 °C) |
| Elastic Modulus | 28.4x10³ ksi (196x10³ MPa) |
Corrosion Resistance:
It has excellent resistance to both oxidizing and reducing acids and alkali metals. The high nickel content provides effective resistance to stress - corrosion cracking. It shows good corrosion resistance in various media such as sulfuric acid, phosphoric acid, nitric acid, organic acids, and alkali metal solutions like sodium hydroxide, potassium hydroxide, and hydrochloric acid.
Applications: It is widely used in sulfuric acid pickling plant equipment, fuel element dissolvers, offshore product piping system components, seawater - cooled heat exchangers, paper industry pipe digesters, pipelines for wet sulfur dioxide gas, phosphoric acid production equipment, and LPG processing equipment.
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