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| Mechanical pfroperties | Incoloy 825 | Inconel 625 |
|---|---|---|
| Density | 8.14 Mg/m3 | 8.44 g/cm3 |
| melting point | 1370-14000C | 1290-13500C |
| Permeability range at 200 oersted in 15.9 kA/m | 1.005 | 1.0006 |
| Curie temperature value in 0C | < -196 | -196 |
| Tensile strength in MPa | 586 | 827 |
| Yield strength in MPa | 241 | 414 |
| Specifications | Incoloy 825 | Inconel 625 |
|---|---|---|
| UNS number | NO8825 | NO6625 |
| WNR number | 2.4858 | 2.4856 |
| Welding consumables | Incoloy 825 | Inconel 625 |
|---|---|---|
| Fillers | 625 filler metal 686CPT filler metal |
INCONEL filler metal 625 INCOLOY 82 |
| Welding electrodes | 112 welding electrode 686CPT welding electrode |
INCONEL 112 welding electrode |
| Mechanical properties | 21°C | 93.3°C | 148.9°C | 204.4°C | 315.6°C | 371.1°C | 426.7°C | 537.8°C | 684.9°C | 982°C |
|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength range in MPa | 585 | 530 | 525 | 515 | 500 | 495 | 485 | - | - | - |
| Yield Strength 0.2% in MPa | 240 | 205 | 190 | 180 | 170 | 165 | 155 | - | - | - |
| Elongation value in % | 30 | - | - | - | - | - | - | - | - | - |
| Thermal expansion of coefficient in µm/m°C ** | - | 14.1 | 14.1 | 14.8 | 15.3 | 15.6 | 15.6 | 15.8 | 16 | - |
| Thermal Conductivity range in kcal/(hr.m.°C) | 9.55 | 10.578 | 10.578 | 11.868 | 13.224 | 14.534 | 14.534 | 15.652 | 16.856 | - |
| Elasticity modulus in GPa | 196 | 192 | 192 | 187 | 181 | 174 | 174 | 168 | 162 | 118 |
| Mechanical properties | 21°C | 204 °C | 316 °C | 427 °C | 538 °C | 649 °C | 760 °C | 871 °C |
|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength in MPa | 992.9 | 923.9 | 910.1 | 910.1 | 896.3 | 820.5 | 537.8 | 275.8 |
| Yield Strength 0.2% in MPa | 579.2 | 455.1 | 434.4 | 420.6 | 420.6 | 413.7 | 406.8 | 268.9 |
| Elongation range in % | 44 | 45 | 42.5 | 45 | 48 | 34 | 59 | 117 |
| Thermal expansion of coefficient µm/m⁰C |
- | 13.1 | 13.3 | 13.7 | 14 | 14.8 | 15.3 | 15.8 |
| Thermal Conductivity value in /kcal/(hr.m.°C) | 8.5 | 10.7 | 12.2 | 13.5 | 15 | 16.4 | 17.9 | 19.6 |
| Elasticity modulus in MPa | 2.07 | 1.93 | 1.93 | 1.86 | 1.79 | 1.65 | 1.59 | - |
| Chemical content | Incoloy 825 | Inconel 625 |
|---|---|---|
| Ni | 38.00-46.00% | 58.00% min. |
| Cr | 19.50-23.50% | 20.00-23.00% |
| Mo | 2.50-3.50% | 8.00- 10.00% |
| Fe | 22.00% min | 5.00% max |
| Nb + Ta | - | 3.15-4.15% |
| Co | - | 1.00% max |
| AL | 0.20% max | - |
| Si | 0.50% max | 0.50% max |
| Mn | 1.00% max | 0.50% max |
| Ti | 0.60-1.20% | 0.40% max |
| Ag | - | 0.40% max |
| C | 0.05% max | 0.10% max |
| S | 0.03% max | 0.01% max |
| P | - | 0.01% max |
| Cu | 1.50-3.00% | - |
| Content | Incoloy 825 | Inconel 625 |
|---|---|---|
| Sulphur (S) | <=0.03.0% | <=0.015% |
| Manganese (Mn) | <=1.00% | <=0.50% |
| Phosphorus (P) | - | <=0.015% |
| Sulfur- significant impact on transient performance | Inconel 625 strictly controls the sulfur content. |
| Manganese has low impact on transient properties but have major influence on the durability of the material. | Inconel 625 is better compared to Incoloy 825 in durability and transient properties. |
| Phosphorus content segregate to form a harmful phase which is affect the material performance and consumes large percentage of niobium to hinder strengthening | Incoloy 825 strictly controls the Phosphorus content but in Inconel 625 phosphorus content should be strictly controlled. |
| Content | Incoloy 825 | Inconel 625 |
|---|---|---|
| Iron (Fe) | >=22.0% | <=5.0% |
| Nickel (Ni) | 38.0-46.0% | >=58.0% |
| Molybdenum | 2.5-3.5% | 8.0-10.0% |
| More iron content reduces cost and corrosion resistance | Incoloy 825 are less expensive and exhibit low corrosion resistance |
| High nickel content provides more corrosion resistance | Inconel 625 exhibit strong corrosion resistance compared to Incoloy 825 |
| More Molybdenum content | Inconel 625 display excellent resistance to aggressive corrosions compared to Incoloy 825 |
Mechanical behaviour
| Content | Incoloy 825 | Inconel 625 |
|---|---|---|
| Niobium and Tantalum (Nb + Ta) | - | 3.15-4.15% |
| Molybdenum (Mo) | 2.5-3.5% | 8.0-10.0% |
| Niobium and tantalum provide strong solid solution strengthening effect. | Inconel 625 exhibit high mechanical strength compared to Incoloy 825 |
| High Mo content offer excellent strengthening effect | Inconel 625 has more stronger strengthening effect. |
