4j78 Iron Nickel Alloy Sheet – Reliable Manufacturer of Iron Nickel Alloy Sheet in China

The 4j78 Iron Nickel Alloy Sheet is a high-performance material known for its excellent precision, stability, and effective resistance to temperature changes. This alloy is widely used in applications requiring minimal thermal expansion and excellent magnetic properties. Its unique blend of elements and precise manufacturing techniques make it a preferred choice in industries such as aerospace, electronics, and precision instruments.

Price: Contact Us for a Custom Quote

For pricing and quotes regarding the 4j78 Iron Nickel Alloy Sheet, please contact us directly. Flexible pricing terms are available based on order size and delivery needs.

Specifications of 4j78 Iron Nickel Alloy Sheet

Thickness: 0.1mm to 10mm
Width: Up to 1000mm
Surface Treatment: Polished, annealed, or customized finishes available
Tolerances: Precision tolerances available upon request

Features (Advantages)

High thermal expansion stability
Excellent magnetic permeability
Superior resistance to corrosion and oxidation
Outstanding machinability and weldability

Applications

The 4j78 Iron Nickel Alloy Sheet is extensively used in the following industries and applications:

Aviation and aerospace components
Precision instruments and measurement devices
Electronics, including relay parts and magnetic shielding
Automotive industry for specialized components

Chemical Composition

Element	Percentage (%)
Nickel (Ni)	77.5-78.5
lron (Fe)	Balance
Carbon (C)	≤ 0.05
Silicon (Si)	≤ 0.30
Manganese (Mn)	≤ 0.40
Sulfur (S)	≤ 0.015
Phosphorus (P)	≤ 0.020

Mechanical Properties

Property	Value
Tensile Strength	520-620 MPa
Yield Strength	260-300 MPa
Elongation	≥30%
Hardness (HB)	135-165
Modulus of Elasticity	140 GPa

Chemical Properties

The 4j78 Iron Nickel Alloy Sheet exhibits excellent resistance to mild acids and alkalis. It performs reliably in neutral or slightly acidic environments but is not recommended for highly acidic or alkaline conditions. This alloy complies with environmental regulations, ensuring safe use in various settings.

Things to Note (Limitations)

High-Temperature Limits: Prolonged exposure above 400°C may affect dimensional stability.
Aggressive Environments: Not suitable for highly corrosive or saline conditions.
Magnetism: Slightly magnetic properties may interfere with sensitive electronic applications.
Machining Challenges: Requires specialized tools for precise cutting due to hardness.

Corrosion Data

Environment	Resistance Level
Atmospheric (Dry)	Excellent
Atmospheric (Humid)	Good
Mild Acids (pH > 4)	Good
Strong Acids (pH < 4)	Poor
Mild Alkalis	Good
Saltwater	Poor

Welding and Fabrication Tips

Welding Methods: TIG, MIG, and resistance welding are recommended for 4j78 Iron Nickel Alloy Sheet.
Forming Techniques: Cold forming, bending, and stamping are effective due to the alloy’s ductility.
Machining: Use carbide tools and low-speed cutting to avoid work hardening.
Heat Treatment: Annealing at 850°C enhances workability and reduces internal stresses.

Customer Reviews

Frequently Asked Questions

Q: What makes 4j78 Iron Nickel Alloy superior to similar materials?

A: Its low thermal expansion and high magnetic permeability make it ideal for applications needing precision and stability.

Q:Can it be used in cryogenic environments?

A: Yes, it performs exceptionally well in cryogenic applications due to its thermal stability.

Q: How does this differ from standard invar materials?

A: The 4j78 sheet is specifically tailored for tighter tolerances and enhanced magnetic properties compared to traditional invar.

Q: What is the difference between 4j78 Iron Nickel Alloy Sheet and other invar plates?

A: The 4j78 alloy offers a specific nickel content (78%) for optimal thermal stability, distinguishing it from other iron–nickel alloys with varying compositions.

Q: What industries use 4j78 Iron Nickel Alloy Sheet?

A: Aerospace, electronics, telecommunications, and scientific research are primary users.