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Expansion K93603 / 4J28 Pipes Super Invar Alloy for Ultra Low Thermal Expansion and Precision Thermal Stability
Expansion K93603 / 4J28 Pipes Super Invar Alloy for Ultra Low Thermal Expansion and Precision Thermal Stability
Specifications
Brand Name :
NikTech
Model Number :
4J28
Certification :
ISO 9001:2015
Place of Origin :
China
MOQ :
150kgs
Price :
Negotiatable
Payment Terms :
L/C,T/T,Western Union
Supply Ability :
300 Ton per Month
Delivery Time :
2-30days
Packaging Details :
Wooden Crate
Primaryuse :
Thermal Expansion Applications
Coefficientofthermalexpansion :
High
Type :
Nickel Strips
Testing Facility :
Accept third party testing such as SGS
Applications :
Used in precision instruments, thermostats, and bimetallic strips
Yield Strength :
240-450 MPa
Magneticproperties :
Non-magnetic or weakly magnetic
Thermal Conductivity :
10-20 W/mK
Description
Expansion K93603 / 4J28 Pipes Ultra Low Expansion Alloy

Expansion K93603 / 4J28 Pipes are precision iron-nickel-cobalt alloy pipes engineered for applications where extremely low thermal expansion is critical. Known internationally as Super Invar Alloy, this material was developed to achieve significantly lower dimensional change than conventional Invar alloys during temperature fluctuations.

The addition of cobalt optimizes the crystal structure and reduces thermal expansion across a practical operating temperature range, making Expansion K93603 / 4J28 Pipes an ideal choice for precision engineering systems. These pipes are widely utilized in aerospace tooling, optical platforms, metrology equipment, semiconductor production systems, and scientific instrumentation where dimensional accuracy directly influences performance.

Specifications
ParameterValue
Outside Diameter6 mm - 168 mm
Wall Thickness0.5 mm - 15 mm
LengthUp to 6000 mm
SurfaceBright Annealed, Pickled
FormSeamless Pipe / Welded Pipe
StandardsASTM F1684, UNS K93603, GB/T 15002
Chemical Composition
ElementContent (%)
Nickel (Ni)31.5 - 33.0
Cobalt (Co)4.0 - 6.0
Iron (Fe)Balance
Carbon (C)≤ 0.05
Manganese (Mn)≤ 0.50
Silicon (Si)≤ 0.30
Phosphorus (P)≤ 0.02
Sulfur (S)≤ 0.02
Mechanical Properties
PropertyValue
Tensile Strength≥ 490 MPa
Yield Strength≥ 240 MPa
Elongation≥ 30%
Hardness≤ 160 HB
Physical Properties
PropertyValue
Density8.15 g/cm³
Melting Range1425 - 1450°C
Thermal Conductivity13.5 W/m*K
Elastic Modulus141 GPa
Electrical Resistivity0.78 µΩ*m
Mean Coefficient of Thermal Expansion (20-100°C)Approx. 0.6 × 10⁻⁶/K
Key Features
  • Extremely low thermal expansion coefficient
  • Excellent dimensional stability during temperature changes
  • Suitable for ultra-precision engineering systems
  • Good machinability and fabrication performance
  • Reliable behavior under repeated thermal cycling
  • Ideal for optical, aerospace, and metrology applications
Applications

Precision Measuring Equipment: Used in metrology frames, calibration systems, and coordinate measuring devices.

Aerospace Tooling: Applied in precision fixtures and thermal-stable aerospace structures.

Optical Systems: Suitable for telescope supports, laser equipment, and optical alignment assemblies.

Semiconductor Manufacturing: Used in wafer processing equipment and precision positioning systems.

Scientific Instrumentation: Applied in vacuum devices and laboratory equipment requiring dimensional stability.

Frequently Asked Questions
What is the main advantage of Expansion K93603 / 4J28 Pipes?

Their ultra-low thermal expansion coefficient helps maintain dimensional accuracy under temperature variation.

Are Expansion K93603 / 4J28 Pipes the same as Super Invar?

Yes. UNS K93603 is internationally known as Super Invar Alloy and corresponds closely to Chinese grade 4J28.

Where are Expansion K93603 / 4J28 Pipes commonly used?

They are widely used in aerospace, optics, semiconductor manufacturing, metrology, and scientific equipment.

Can Expansion K93603 / 4J28 Pipes be machined?

Yes. The alloy offers good machinability for precision components and assemblies.

Why are Expansion K93603 / 4J28 Pipes used in measurement systems?

Because they minimize dimensional changes caused by temperature fluctuations, improving measurement accuracy.

Surface & Delivery Options
  • Surface: bright annealed, pickled
  • Form: seamless pipe, welded pipe
  • Packaging: moisture-proof wrapping with reinforced export wooden cases
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Expansion K93603 / 4J28 Pipes Super Invar Alloy for Ultra Low Thermal Expansion and Precision Thermal Stability

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Product Detail
Brand Name :
NikTech
Model Number :
4J28
Certification :
ISO 9001:2015
Place of Origin :
China
MOQ :
150kgs
Price :
Negotiatable
Contact Supplier
Expansion K93603 / 4J28 Pipes Super Invar Alloy for Ultra Low Thermal Expansion and Precision Thermal Stability

Wuxi Nickel Alloy New Material Technology Co., Ltd

Verified Supplier
2 Years
jiangsu, wuxi
Since 2002
Business Type :
Manufacturer
Main Products :
Monel Alloy, Inconel Alloy, Resistance Alloy
Total Annual :
20000000-80000000
Employee Number :
50~500
Certification Level :
Verified Supplier
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