DIN 2.4858 Super Alloy
DIN 2.4858 equivalent to Incoloy 825, it is composed of addition of molybdenum, copper, and titanium into its nickel-iron-chromium base. The extra metals give Incoloy 825 exceptional resistance against corrosion, even more so than other nickel alloys. It displays more resistance in aqueous conditions compared to Incoloy 800. The molybdenum and copper added to the nickel content also gives the metal protection against environments that usually reduce metals, such as sulfuric and phosphoric acids. Because of this, Incoloy 825 is commonly utilized in acidic environments, such as the pickling industry, pollution control and disposal of radioactive wastes.
The metal is pliable under both hot and cold working practices, however there are temperature limitations. Heat working should fall between 1600-2150° F. However, too far above this temperature range can result in structural changes within the metal, and should be avoided in situations where creep is disastrous. As for cold working, Incoloy 825 is more pliable under cold working than many stainless steels and so may be preferred over them.
Chemical Composition:
| C | Si | Mn | P | S | Cr | Mo | Ni | Ti | Cu | AL | Co |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤ | ≤ | ≤ | ≤ | ≤ | 19,50 | 2,50 | 38,00 | 0,60 | 1,50 | ≤ | ≤ |
| 0,025 | 0,50 | 1,00 | 0,02 | 0,015 | 23,50 | 3,50 | 46,00 | 1,20 | 3,00 | 0,20 | 1,00 |
Physical properties:
| Property | Value |
|---|---|
| Density: lb/in2 | 0,294 |
| Hardness: HB | 135-165 |
| Permeability at 20°C/68°F | 1,004 |
| Temperature T °C/F (°C/F) | Specific heat J / kgK (Btu / lb °F) | Thermal conductivity W/mK (Btu·in / ft2·h·°F) | Electric resistance µΩ · cm (Ω circ mill / ft) | Modulus of elasticity kN/mm2 (103 ksi) | Expansion rate from 70°F bis T 10-6 / K (10-6 / °F) |
|---|---|---|---|---|---|
| 20/68 (93/200) | 440 (0105) (110) | 10,8 (73) | 11,2 | 195(28,7) (27,4) | |
| 100/212 | 462 | 2,4 | 114 | 190 | 14,1 |
| 200/392 (204/400) | 488 (0,117) | 14,1 (98) | 118 (710) | 185 (26,8) | 14,9 (8,3) |
| 400/762 (427/800 | 540 (0,131) | 16,9 (120) | 124 (751) | 174 (25,0) | 15,6 (8,7) |
| 500/932 (538/1000) | 565 (0,137 | 18,3 (131) | 126 (761) | 168 (23,8) | 15,8 (8,8) |
| 700/1292 (760/1400) | 615 (0,153) | 21 (155) | 127 (765) | 154 (21,2) | 16,7 (9,5) |
| 900/1652) 982(1800) | 680 (0,167) | 25,7 (192) | 129 (782) | 130 (17,3) | 17,6 (9,9) |
| 1000/1832 | 710 | 28,1 | 130 | 119 | 17,9 |
Mechanical properties (20°C / 68°F):
| Yield strength RP 0,2 (MPa) | >=235 | ||
|---|---|---|---|
| Yield strength RP 1,0 (MPa) | 265 | ||
| Tensile strength- (ksi | 100 | ||
| Elongation (%) | 45 | ||
| Impact energy ISO-V bei RT--längs (J/cm2) bei RT- quer (J /cm2) | >=150 >= 100 | ||
Temperature information:
| Application area | ||
|---|---|---|
| Operation temperature | -321 ºF to 1022 ºF | |
| Soft annealing | ||
|---|---|---|
| Working temperature | 1688 ºF to 1796 ºF | |
| Explanation report | cooling by water | |
| Processing informations | preferably 1700°F | |
| Solution heat treatment | ||
|---|---|---|
| Working temperature | 2102 ºF to 1652 ºF | quick cooling air/water |
| Explanation report | when reaching 1652°F re-heating is required | |
| Processing informations | heat oven to must value and insert component hold for approx. 60 min per 4" thickness | |