Non-magnetic fixed expansion porcelain sealing alloy in 4J78 standard (YB/T5233-93).
Compared with other non-magnetic porcelain sealing alloys, Expanded alloy 4J78 Plate has low magnetic permeability and low expansion coefficient, so it is called non-magnetic constant expansion porcelain sealing alloy. Adding small amounts of copper to the alloy can improve its processability. It has moderate linear thermal expansion coefficient in the range from room temperature to 600°C, no magnetic corrosion, and high strength and toughness.
Specifications |
In stock, can be customized according to customer requirements |
Form |
Plate,Strip,Bar,Wire |
Classification |
Expanded alloy |
Densit（g/cm³） |
Magnetic permeability(16kA/m) |
Thermal conductivity/w/(m.k) |
Resistivity℃)/（Ω.mm2/m) |
Tensile strength MPa |
Yield strength（MPa） |
Elongation |
Elastic modulus MPa |
9.38 |
1.001 |
16.7-16.7 |
117 |
869 |
353 |
54 |
222*103 |
C |
P |
S |
Mn |
Si |
Mo |
Cu |
Ni |
≤0.05 |
≤0.02 |
≤0.20 |
≤0.40 |
≤0.30 |
20.0-22.0 |
≤1.5 |
Balance |
Expanded alloy 4J78 Plateis widely used in the aerospace field to manufacture engine parts, turbine blades, combustion chambers, and other key components to improve the performance and reliability of aircraft.
Expanded alloy 4J78 Plateoccupies an important position in the petrochemical industry and is used to manufacture chemical equipment, catalysts, pipelines, etc. To cope with the working environment of high temperature, high pressure, and corrosive media.
Expanded alloy 4J78 Plateis also widely used in the power supply field to manufacture high-temperature thermocouples, electric heaters, and other power supply equipment to meet the needs of power systems for high-temperature environments.
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.
Machine cutting
Sheet cutting
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Bar and structural cutting
polishing
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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