Our 4J45 Iron-Nickel Alloy Bar is a top choice for precision instrument and component fabrication. With 45% nickel and 55% iron, it boasts a low CTE of ~4.5 ppm/°C (20-300°C), keeping your components rock-steady through temperature changes. It’s strong, corrosion-resistant, and easy to machine, making it ideal for crafting high-accuracy parts. Whether you’re building gauges or optical systems, our 4J45 bar delivers the precision and reliability you need.

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The precision manufacturing sector is booming, with a projected CAGR of 5.7% through 2032, driven by advancements in aerospace, electronics, and automation. As industries push for smaller, more accurate components, low- Expansion Alloy s like our 4J45 bar are critical. Aerospace relies on them for optical and navigation systems, while electronics need stable materials for connectors and sensors. The rise of smart manufacturing and IoT is driving demand for precision instruments that can handle tight tolerances. Our 4J45 bar is designed to meet these trends with top-notch stability.

Elements		4J29	4J36
Carbon (C)	Not greater than	0.03	0.05
Sulfur (S)		0.02	0.02
Phosphorus (P)		0.02	0.02
Manganese (Mn)		≤0.50	0.20-0.60
Silicon (Si)		≤0.30	≤0.30
Nickel (Ni)		28.5-29.5	35.0-37.0
Chromium (Cr)		-	-
Cobalt (Co)		16.8-17.8	-
Iron (Fe)		Rest	Rest
Other Elements

Alloy Grade	20°C-100°C	20°C-300°C	20°C-500°C
4J36 Invar Alloy	1.2×10⁻⁶ /°C	2.5×10⁻⁶ /°C	-
4J29 Kovar Alloy	4.6×10⁻⁶ /°C	5.5×10⁻⁶ /°C	6.2×10⁻⁶ /°C

Alloy Grade	4J36 Invar Alloy	4J29 Kovar Alloy
Density (g/cm³)	8.1	8.2
Tensile Strength (MPa)	500-600	600-700
Yield Strength (MPa)	250-350	300-400
Hardness (HV)	150-200	200-250

Alloy Grade	4J36 Invar Alloy	4J29 Kovar Alloy
Electrical Resistivity (10⁻⁶ Ω·cm)	80	50
Thermal Conductivity (W/m·K)	10-12	16-18

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Our 4J45 Iron-Nickel Alloy Bar is a workhorse in precision fabrication. It’s used in high-accuracy gauges and meters, ensuring consistent readings in scientific and industrial settings. Optical instruments, like those in telescopes or microscopes, rely on its stability for precise alignment. In electronics, it’s perfect for temperature regulators and connectors that resist thermal distortion. Aerospace navigation systems also benefit from its low CTE, keeping components accurate in varying conditions. Wherever precision is critical, our 4J45 bar shines.

Comparison Table: 4J45 Iron-Nickel vs. 4J47 Nickel-Iron vs. Invar 4J36

Parameter	4J45 Iron-Nickel	4J47 Nickel-Iron	Invar 4J36
Composition	45% Ni, 55% Fe	47% Ni, 53% Fe	36% Ni, 64% Fe
CTE (ppm/°C, 20-300°C)	~4.5	~4.7	~1.2–1.5
Temperature Range	-40°C to 300°C	-40°C to 350°C	-50°C to 230°C
Curie Temperature	~400°C	~410°C	~279°C
Yield Strength (MPa)	~320	~330	~260–300
Tensile Strength (MPa)	~530	~540	~450–550
Density (g/cm³)	8.20	8.18	8.05
Applications	Precision gauges, optical instruments	Precision tooling, optical mounts	Aerospace tooling, composite molds
Corrosion Resistance	Good	Excellent	Moderate

We know the market’s full of alloy options, but our 4J45 Iron-Nickel Alloy Bar stands out for its quality and versatility. Our rigorous quality control ensures a consistent CTE and solid mechanical properties (yield strength ~320 MPa, tensile strength ~530 MPa). We offer customized bar sizes and forms to match your exact needs, with faster delivery than many alternatives. Our efficient production process keeps costs down without compromising quality, and our alloy’s balanced properties give it an edge in precision applications. With decades of expertise, we’re your trusted partner for high-performance alloy solutions.

Why Choose Our 4J45 Iron-Nickel Alloy Bar?

Our 4J45 Iron-Nickel Alloy Bar is built for precision instrument and component fabrication. Its low thermal expansion, durability, and corrosion resistance make it ideal for gauges, optical systems, and electronics. Whether you’re in aerospace, electronics, or advanced manufacturing, our bar ensures your components stay accurate and reliable. Contact us today to see how 4J45 can elevate your precision projects!

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About Us:

Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications. For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.

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FAQs

1. What is 4J45 Iron-Nickel Alloy Bar?
   It’s a nickel-iron alloy bar designed for precision instrument fabrication, offering low thermal expansion for high-accuracy components.

2. What are the key properties of 4J45?
   It has a CTE of ~4.5 ppm/°C (20-300°C), excellent dimensional stability, and good corrosion resistance, ideal for precision applications.

3. What industries use 4J45 Alloy Bar?
   Precision manufacturing, aerospace, electronics, and scientific instrumentation rely on it for stable, high-precision components.

4. What are common applications for 4J45?
   It’s used in precision gauges, optical instruments, temperature regulators, and electronic connectors requiring minimal thermal distortion.

5. How does 4J45 compare to other precision alloys?
   Its 45% nickel content offers a balanced CTE and strength, providing better stability than many similar alloys for precision fabrication.

6. What temperature range is 4J45 effective in?
   It maintains low thermal expansion from -40°C to 300°C, ensuring reliability in moderate temperature environments.

7. Is 4J45 weldable or machinable?
   Yes, it’s weldable and machinable with standard techniques, with slow speeds recommended for optimal precision.

8. How does 4J45 align with industry trends?
   It supports the demand for high-precision materials in aerospace, electronics, and automation, driven by trends in miniaturization and smart manufacturing.