Alloy 46 superalloy
Alloy 46(UNS K94600, NiLo46) controls expansion alloy, 46% nickel composition, and balance iron for a variety of electronic applications, especially for glass and ceramic seals.
The controlled expansion alloy contains 46% Ni/Fe balance; Used in a variety of electronic applications, especially for glass and ceramic seals.
Alloy 46 Purpose
Used for making iron nickel cobalt alloy strip, bar, plate and pipe with hard glass.
It is suitable for electric vacuum devices such as transmitting tube, oscillation tube, ignition tube, transistor, tube seal plug and relay shell.
With a certain coefficient of linear expansion in the temperature range of 20℃-450℃, it can be firmly sealed with hard glass.
Grade & Chemical Composition (see Table 1)
Table 1 Grade & Alloy 46 Chemical Composition
| Grade | Chemical Composition (%) | ||||||||
| C | P | S | Mn | Si | Ni+Co+Cu | Co | Cu | Fe | |
| ≤ | |||||||||
| 4J46 | 0.05 | 0.020 | 0.020 | 0.40 | 0.30 | 45.0～46.0 | 5.0～6.0 | 3.0～4.0 | Balance |
Notes:
1、Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of nickel, cobalt and copper are allowed to deviate from the stated range.
2、The shape and dimensions of the alloys are in compliance with GB/T14985.
Physical Property (see Table 2)
Table 2 Alloy 46 coefficient of linear expansion
| Grade | Heat treatment of samples | Average coefficient of linear expansion | ||
| 20～300°C | 20～400°C | 20～500°C | ||
| 4J46 | Heat to 850～900°C in a protective atmosphere or in vacuum condition, hold for 1 hour, and then cool to 300℃ at a rate less than 300℃/h | 5.5～6.5 | 5.6～6.6 | 7.0～8.0 |
Notes:
1. The Vickers hardness of the annealed strip (sheet) should be no more than 170.
2. For the unannealed strip (sheet) delivered, after heat treat at 900℃, and then hold for 30 min, the Vickers hardness should be no more than 170.
Typical Property (see Table 3—Table 6)
Table 3 Alloy 46 coefficient of linear expansion
| Grade | Average coefficient of linear expansion in different temperature, ā/(10-6/K) | |||||
| 20～100℃ | 20～200℃ | 20～300℃ | 20～400℃ | 20～500℃ | 20～600℃ | |
| 4J46 | 6.8 | 6.5 | 6.4 | 6.4 | 7.9 | 9.3 |
Table 4 Alloy 46 Mechanical Property
| Grade | Heat treatment temperature,℃ | Tensile strength, sb/MPa | Tensile stretch, δ(%) | Vickers hardness | Grain size |
| 4J46 | 750 | 527.5 | 34.8 | 137.4 | 7 |
| 850 | 510 | 35.4 | 134.6 | 6 | |
| 950 | 483.5 | 36.7 | 128.1 | 6～5 | |
| 1050 | 466.5 | 34.3 | 125.6 | 5～4 |
Table 5 Alloy 46 Magnetic Property
| Grade | magnetic induction | remanent magnetic induction/ Br/T | coercivity | maxmum perameability | |
| B10/T | Bl00/T | ||||
| 4J46 | 1.58 | 1.6l | 0.31 | 2.96 | 55.5 |
Table 6 Other Propertise of the Alloy
| Grade | modulus of elasticity | Resistivity | thermal conductivity200℃/[W/(m•K)] | Density/(g/cm3) |
| 4J46 | 137500 | 0.54 | 20.1 | 8.18 |
