Nickel Alloy N4 Chemical Composition (wt%):
Ni≥99.9%, C≤0.01%, Cu≤0.015%, Si≤0.03%, Mn≤0.002%, Mg≤0.01%, S≤0.001%, P≤0.001%, Fe≤0.04%, Pb/Bi/As/Sb/Cd/Sn≤0.001%, Zn≤0.005%, Total Impurities≤0.1%
Nickel Alloy N4 Processing Properties:
① Cold Working: Cold rolling, cold drawing, stamping; precision strip and wire, intermediate annealing required to remove hardening; control of deformation per pass.
② Hot Working: Temperature range 700-1200℃, hot rolling, forging. TIG welding or laser welding; inert gas protection; pre-weld oxide layer removal.
③ Machining: The material is relatively soft and sticky, which can easily lead to tool sticking and chip removal difficulties. Sharp tools are required. Low speed, high feed rate, and adequate cooling are recommended.
Nickel Alloy N4 heat treatment process：
| Heat treatment process | Core process parameters | Main functions and explanations |
| Annealing temperature | 650-850℃ | Eliminate work hardening and restore material plasticity |
| Heat preservation time | 1-2 hours | Ensure uniform heating of all parts of the workpiece and sufficient microstructure transformation |
| Cooling method | Air cooling or furnace cooling | Avoid the introduction of new internal stresses through rapid cooling |
Annealing Atmosphere Selection: Annealing in a hydrogen or vacuum environment is recommended. This effectively prevents nickel surface oxidation, eliminating the need for subsequent pickling steps and resulting in a smoother surface.
Expected Performance Changes: With proper annealing (e.g., holding at 650°C for 2 hours), the hardness of pure nickel N4 can be significantly reduced, while the elongation can be greatly improved, restoring excellent workability.
Typical performance characteristics of Nickel Alloy N4:
Mechanical properties of the board
| Status | Thickness/mm | Rm/Mpa | Rpo.2/M pa | A% |
| Soft state | ≤1.5 | >345 | >80 | >35 |
| Soft state | >1.5 | >345 | >80 | >40 |
| Hot-worked state | >4 | >345 | >80 | >30 |
| Cold-worked state | <2.5 | >490 | - | >2 |
Mechanical properties of bars
| State | Diameter (mm) | Rm/Mpa | A/% |
| Cold-worked state | 3-20 | ≥590 | ≥5 |
| >20-30 | ≥540 | ≥6 |
| >30-65 | ≥510 | ≥9 |
| Soft state | 3-30 | ≥380 | ≥34 |
| >30-65 | ≥345 | ≥35 |
| Hot-worked state | 32-60 | ≥345 | ≥25 |
| >60-254 | ≥345 | ≥20 |
Nickel Alloy N4 Application Areas:
Corrosion-resistant containers, experimental equipment, evaporator components for salt production and seawater desalination, battery cell tabs and busbars for power battery modules, reaction vessels, pipelines, vacuum tube components, caustic soda (NaOH) production equipment, organochlorine and fluoride production equipment, fatty acid processing equipment.
