4J42 alloy pipe iron-nickel fixed expansion alloy is a series of fixed expansion alloys that can match soft glass and ceramics with different expansion coefficients within a given temperature range by adjusting the nickel content. Its expansion coefficient and Curie point increase with the nickel content. And increase. This alloy is a widely used sealing structural material in the electric vacuum industry.
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Specifications |
In stock, can be customized according to customer requirements |
|
Form |
Plate,Strip,Bar,Wire |
|
Classification |
Expanded alloy |
|
Alloy |
C |
Mn |
Si |
P |
S |
Al |
Co |
Ni |
Fe |
|
4J50 |
0.05 |
0.80 |
0.30 |
0.020 |
0.020 |
0.10 |
1.0 |
49.5-50.5 |
balance |
4J50 thermal properties: 4J50 melting temperature range: the melting temperature of the alloy is about 1430°C; 4J50 thermal conductivity λ=16.7W/(m·°C); 4J50 specific heat capacity: the specific heat capacity of the alloy is 502J/(kg?°C).
4J50 linear expansion coefficient: average linear expansion coefficient of alloy specified by the standard
|
20～300℃ |
20～400℃ |
20～450℃ |
|
9.2～10.0 |
9.2～9.9 |
- |
4J50 density ρ=8.21g/cm3; 4J50 electrical properties resistivity ρ=0.44μΩ·m
|
/10-6℃-1 |
|
|
|
|
|
|
|
|
20～100℃ |
20～200℃ |
20～300℃ |
20～350℃ |
20～400℃ |
20～450℃ |
20～500℃ |
20～600℃ |
|
9.8 |
9.8 |
9.5 |
9.4 |
9.4 |
9.4 |
9.7 |
10.6 |
4J50 magnetic properties: 4J50 Curie point Tc=500℃; 4J50 alloy magnetic properties:
At 4000A/m, the residual magnetic induction intensity Br=1.03T, and the coercive force Hc=10A/m.
4J50 chemical properties alloy has good corrosion resistance in the atmosphere, fresh water and sea water.
|
H/(A/m) |
8 |
16 |
24 |
40 |
80 |
|
B/T |
0.29 |
0.64 |
0.74 |
0.83 |
0.94 |
|
H/(A/m) |
160 |
400 |
800 |
2000 |
4000 |
|
B/T |
1.06 |
1.20 |
0.30 |
1.44 |
1.50 |
4J50 heat treatment system The heat treatment system of the expansion coefficient performance test sample stipulated in the standard: heat the sample to 900℃±20℃ in a hydrogen atmosphere, keep it for 1 hour, and cool it to below 200℃ at a speed of no more than 5℃/min.
4J50 Application Overview and Special Requirements 4J50 is a typical grade of glass-sealed alloy. It has been used in aviation factories for a long time and has stable performance.
4J50 alloy is mainly used to make precision impedance diaphragms, wet reed and dry reed relays, precision length measurement, and sealing with corresponding soft glass.
The selected sealing material should be matched to the expansion coefficient of the alloy in the application. The grain size should be controlled during heat treatment to ensure that the material has good deep-drawing tensile properties. When using forged or rolled materials, the air tightness of the materials should be strictly inspected.
The manufacturing process of stainless steel and alloys involves multiple steps to transform raw materials into flat,rectangular sheets or plates made of stainless steel and alloys. Here are a few key steps for stainless steel and alloys:
Molten stainless steel and alloys are cast into large ingots or billets through a casting process.
During the hot rolling process,the thickness of the steel ingot is gradually reduced and elongated to form long strips or coils.
Annealing involves heating stainless steel and alloys to a specific temperature and then slowly cooling it.
Cold rolling is carried out through rolling mills to reduce thickness to meet customer specifications.
Wuxi Walmay Metal Co,Ltd is a comprehensive processing group of Alloy Steel、Forged Parts Fitting、Titanium Alloy、Stainless Steel、Special Welding Wireseries， and more than 800 specifications.
Our group has been engaged in the domestic and global market for more than ten years with rich steel experience and can offer professional advice for customers inapplications with different materials.
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Heat treatment and annealing: Wuxi Walmay Metal can heat treat certain 400 series stainless steels.
Material Reliability Identification (PMI): Wuxi Walmay Metal can complete this testing in-house.
Ut Testing: Ultrasonic testing (UT) uses high-frequency sound energy to inspect and measure stainless steel products.
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