2.4856 Similar name: UNS N06625, N06625, NC22DNb, GH3625
2.4856 is a Ni-Cr-based solid solution strengthened deformed superalloy with chromium, molybdenum and niobium as the main solid solution strengthened elements. The maximum operating temperature is 950℃. Excellent corrosion resistance to various corrosive media in oxidation and reduction environment, excellent point corrosion resistance and crevice corrosion resistance, and no stress corrosion cracking caused by chloride, excellent corrosion resistance to inorganic acids, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and the mixed acid of sulfuric acid and hydrochloric acid, etc. Excellent resistance to the corrosion of various inorganic acid mixed solution, temperature up to 40℃, in all concentrations of hydrochloric acid solution can show good corrosion resistance, good workability and weldability, no cracking sensitivity after welding, with the wall temperature of -196 ~ 450℃ pressure vessel manufacturing certification, used in organic chemical processes containing chloride.
Process Performance and Requirements
Vacuum Induction Furnace(VIM) and Electroslag Remelting Furnace(ESR)
- Product Chemical Composition
| Alloy | % | Ni | Cr | Mo | Nb | Fe | Al | Ti | C | Mn | Si | Co | P | S |
| 2.4856 | Min | Rem | 20 | 8 | 3.15 | | | | | | | | | |
| Max | | 23 | 10 | 4.15 | 5 | 0.4 | 0.4 | 0.1 | 0.5 | 0.5 | 1 | 0.015 | 0.015 |
- Product Physical Property
| Density | 8.44/cm3 |
| Melting Point | 1290-1350℃ |
| Magnetic Energy | Nil |
- Product Mechanical Property
| Standard Number | Variety | Heat Treatment | Room-temperature Property | Stress Rupture Property |
| MPa | MPa | % | % | Hardness | MPa | r/h | % |
| ≥ | ≤ | | ≥ |
| GJB 3165A Liaoxin 7-0023 | Hot-rolled and Forged Rod | (950-1030)℃/AC or WQ | 830 | 410 | 30 | TEST | HB290 | 114 | 23 | 15 |
| GJB 3317A | Hot-rolled Plate | (950-1030)℃/AC | 830 | 410 | 30 | TEST | HV305 | 114 | 23 | 15 |
| Liaoxin 7-0038 | Cold-rolled Sheet | (950-1030)℃/AC or (1090-1200)℃/AC | 830 | 410 | 30 | --- | HV305 | 114 | 23 | 15 |
| Q/3B 4080 | Pipe | (960-1030)℃/AC or WQ | 825 | 415 | 35 | --- | HRC25 | --- | ---- | --- |
- Product Heat Treatment Institution
Rods and forgings,(1090~1200)℃x(1.5~2)h/WQ;
Wire,(1090-1200)℃/≥Air cooling rate,d≤3mm,heat preservation(9~15)min;d3mm~5mm,heat preservation(15~20)min;
hot rolled steel plate,(950~1030)℃/AC,HB≤305hV;
Pipe,(960~1030)℃/AC或 or WQ
| Cold-drawn Wire | ¢0.3~¢18mm(Delivery in rolls or trays) |
| Hot-Rolling Wire | ¢5.5~¢20mm(Delivery in rolls) |
| Strip | thickness 0.1~4.5*width 6~350mm(Supply in rolls or straight strips) |
| Smooth Forged Rod on a Lathe | ¢60~350mm,L800-2500mm |
| Hot-rolled Burnishing | ¢20~80mm,L1000-5000mm |
| Cold Drawn and Burnishing | ¢2.5~18mm,L1000-8000mm |
| Seamless Tube | ¢1~275mm,wall thickness 0.2~30,L1000-8000mm |
