4J40 Corrosion Resistant Alloy Rod Iron Nickel Cobalt Alloy
KX 4J40 Corrosion Resistant Alloy Light Rod On Expansion Alloy
Product Description and Application
4J40 is also known as Alloy 40
4J40 is Fe-Ni-Co ternary alloy and its curie point is above 300℃. The alloy has a low expansion coefficient in the temperature range of -20 ~ 300℃, and the transformation from austenite (γ) to martensite (M) does not occur until -60℃. The alloy is mainly used in the manufacture of highly precise instrument parts and electronic devices requiring sizes in the temperature range of -50 to 300℃
Process Performance and Requirements
- Product Fusion Process
Vacuum Induction Furnace(VIM) and Electroslag Remelting Furnace(ESR)
- Product Chemical Composition
| Alloy Grade | Chemical Composition (mass fraction)(％) | ||||||||
| C | Si | P | S | Mn | Cu | Ni | Co | Fe | |
| ≤ | |||||||||
| 4J40 | 0.05 | 0.15 | 0.02 | 0.02 | 0.25 | --- | 32.4～33.4 | 7.0～8.0 | Rem |
- Product Linear Expansion Coefficient
| Alloy Grade | Sample Heat Treatment Institution | Average coefficient of linear expansionα(10-6/ K) | |
| 20～100℃ | 20～300°C | ||
| 4J40 | The semi-finished sample was heated to 840±10°C, hold for 1 hour, water quenched, and then the sample was processed into finished sample. Heat preservation 1 hour at 315±l0℃ with furnace cooling or air cooling | ～ | ≤2.0 |
- Product Typical Average Linear Expansion Coefficient
| Alloy Grade |
Average Coefficient of Linear Expansion α(10-6/ K) |
|||||
| 20～50℃ | 20～100℃ | 20～200℃ | 20～300℃ | 20～400℃ | 20～500℃ | |
| 4J40 | 1.4 | 1.3 | 1.2 | 1.7 | 4.5 | ～ |
- Productive Process
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Professional Customization
| 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 |
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