Super Invar Alloy Plate – Fe-Ni-Co Ultra Low Expansion Alloy
Product Short Description
Super Invar, also known as Invar 32-5 or Fe-Ni-Co ultra low expansion alloy, is a precision controlled expansion alloy designed for applications requiring extremely high dimensional stability under temperature changes. Compared with standard Invar 36, Super Invar offers an even lower coefficient of thermal expansion within a limited temperature range, making it suitable for precision instruments, optical systems, scientific equipment, aerospace fixtures and high-stability tooling.
SASA ALLOY supplies Super Invar plates, sheets, cut plates and customized machined materials according to customer requirements. Products can be supplied with chemical composition analysis, mechanical testing, dimensional inspection, PMI testing, surface inspection, EN 10204 3.1 material certificate and full heat number traceability.
- Product Name: Super Invar Plate – Ultra Low Expansion Fe-Ni-Co Alloy
- Material Grade: Super Invar / Invar 32-5 / Fe-Ni-Co Alloy
- Product Type: Ultra Low Expansion Controlled Expansion Alloy Plate
- Main Feature: Extremely low thermal expansion and excellent dimensional stability
- Applications: Precision instruments, optical systems, aerospace fixtures, scientific equipment and high-stability tooling
Product Parameters
| Item | Specification |
|---|---|
| Product Name | Super Invar Plate – Ultra Low Expansion Fe-Ni-Co Alloy |
| Material Grade | Super Invar / Invar 32-5 / Fe-Ni-Co Alloy |
| Material Type | Nickel-Iron-Cobalt Ultra Low Expansion Alloy |
| Product Form | Plate, Sheet, Strip, Flat Bar, Cut Plate, Machined Plate, Custom Machining Parts |
| Thickness | 0.5 mm – 100 mm or customized |
| Width | 100 mm – 2000 mm or customized |
| Length | 500 mm – 6000 mm or cut to size |
| Surface Condition | Hot Rolled, Cold Rolled, Pickled, Polished, Ground, Machined |
| Standard | ASTM, UNS, EN, DIN, JIS, GB or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional Inspection, Surface Inspection |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, Shearing, Grinding, CNC Machining, Custom Size Processing |
Chemical Composition
The chemical composition of Super Invar is designed to achieve ultra low thermal expansion performance. The following values are for general reference only. Final composition should be confirmed according to the applicable standard, purchase order and mill test certificate.
| Element | Ni | Co | Fe | C | Mn | Si | P | S | Cu | Cr |
|---|---|---|---|---|---|---|---|---|---|---|
| Content % | 31.0 – 33.0 | 4.0 – 6.0 | Balance | ≤0.05 | ≤0.60 | ≤0.30 | ≤0.020 | ≤0.020 | ≤0.30 | ≤0.25 |
Mechanical Properties
Mechanical properties of Super Invar plate may vary depending on thickness, heat treatment condition, cold working ratio and final application requirements. SASA ALLOY can provide mechanical test reports according to customer specifications.
| Condition | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Annealed / Typical | 450 – 650 MPa | 240 – 350 MPa | 25% min | According to condition | Approx. 8.1 g/cm³ |
| Cold Worked / Custom | According to order | According to order | According to order | According to order | Approx. 8.1 g/cm³ |
Note: For Super Invar applications, coefficient of thermal expansion, thermal stability, dimensional accuracy and heat treatment condition are often more important than conventional strength values.
Common Size Table
| Thickness | Width | Length | Surface | Availability |
|---|---|---|---|---|
| 0.5 – 3.0 mm | 100 – 1000 mm | 500 – 3000 mm | Cold Rolled / Pickled | Stock / Production |
| 3.0 – 10 mm | 300 – 1500 mm | 1000 – 4000 mm | Hot Rolled / Pickled | Stock / Production |
| 10 – 30 mm | 500 – 2000 mm | 1000 – 6000 mm | Hot Rolled / Ground | Production |
| 30 – 100 mm | According to order | According to order | Machined / Ground | Made to Order |
Different Specifications Comparison
| Type | Thickness Range | Surface Condition | Typical Use |
|---|---|---|---|
| Super Invar Sheet | 0.5 – 6 mm | Cold Rolled / Pickled / Polished | Precision instrument parts, optical support parts, small components |
| Super Invar Plate | 6 – 100 mm | Hot Rolled / Ground / Machined | Optical platforms, aerospace fixtures, scientific equipment and tooling |
| Super Invar Cut Plate | Customized | Cut / Ground / Machined | Custom machining blanks and precision components |
| Super Invar Precision Plate | According to drawing | Ground / CNC Machined | High stability optical systems, measuring equipment and scientific instruments |
Equivalent Standards and International Names
Super Invar is known by different names in international markets. Customers may search for Super Invar, Invar 32-5, Fe-Ni-Co alloy, ultra low expansion alloy or controlled expansion alloy plate.
| Country / Standard | Common Name | Equivalent Grade |
|---|---|---|
| Commercial Name | Super Invar | Ultra Low Expansion Alloy |
| Fe-Ni-Co System | Invar 32-5 | Fe-Ni-Co Controlled Expansion Alloy |
| Industrial Name | Super Invar 32-5 | Precision Low Expansion Alloy |
| Application Name | Ultra Low Expansion Alloy | High Stability Precision Alloy |
| Custom Specification | Customer Drawing / Technical Requirement | Super Invar Equivalent |
Production Process Flow
The production process of Super Invar plate requires strict control of chemical composition, melting quality, rolling condition, annealing process and dimensional accuracy to ensure ultra low expansion performance and long-term stability.
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material Selection | Select qualified nickel, iron and cobalt raw materials | Raw material certificate and traceability |
| Melting | Control alloy composition and impurity elements | Chemical composition analysis |
| Rolling | Hot rolling or cold rolling according to thickness | Thickness, flatness and surface control |
| Annealing | Heat treatment to improve structure and dimensional stability | Temperature and holding time control |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, certificate review |
Product Inspection
1. Chemical Composition Inspection
Chemical composition analysis is performed to verify nickel and cobalt content. For Super Invar plate, stable Fe-Ni-Co composition is important for ultra low expansion performance and material consistency.
2. Mechanical Properties Testing
Tensile strength, yield strength, elongation and hardness can be tested according to customer requirements. Mechanical testing helps confirm material reliability for precision industrial applications.
3. Dimensional Inspection
Thickness, width, length, flatness and tolerance are inspected before shipment to ensure that the Super Invar plate meets the purchase order or drawing requirements.
4. PMI Testing and Traceability
PMI testing can be used to verify material grade and prevent material mix-up. Heat number traceability and EN 10204 3.1 material certificate can be supplied with the shipment.
Product Packaging
SASA ALLOY provides export-grade packaging for Super Invar plates to protect the material during sea, air and land transportation.
- Protective Film: Applied to polished or machined surfaces to reduce scratches.
- Waterproof Wrapping: Used to protect plates from moisture during transport.
- Wooden Case Packaging: Suitable for cut plates and precision machined plates.
- Pallet Packing: Suitable for heavy plates and batch shipments.
- Clear Marking: Grade, heat number, size, quantity and customer PO number can be marked on labels.
Applications
Super Invar is widely used where extremely low thermal expansion and reliable dimensional stability are required. It is especially suitable for high precision scientific, optical and aerospace applications.
| Industry | Typical Applications | Why Super Invar Is Used |
|---|---|---|
| Precision Instruments | Measuring tools, calibration equipment, reference components | Ultra low expansion and excellent dimensional stability |
| Optical Systems | Optical benches, mirror supports, laser equipment parts | Maintains alignment under temperature changes |
| Aerospace | Fixtures, tooling plates, structural reference parts | Stable performance in precision assembly applications |
| Scientific Equipment | Laboratory instruments, metrology systems, precision platforms | Reduces thermal deformation and dimensional drift |
| High Stability Tooling | Molds, gauges, precision tooling and support structures | Reliable dimensional control under temperature variation |
Why Choose SASA ALLOY?
- Professional supplier of Super Invar / Invar 32-5 ultra low expansion alloy materials
- Customized thickness, width, length and cut-to-size service available
- Support for ASTM, UNS, EN, DIN, JIS, GB and customer specifications
- Material traceability with heat number control
- EN 10204 3.1 material certificate available
- Chemical analysis, mechanical testing, PMI testing and dimensional inspection support
- Export packaging suitable for international transportation
- Suitable for precision instruments, optical systems, aerospace fixtures and scientific equipment
FAQ
What is Super Invar?
Super Invar is an ultra low expansion Fe-Ni-Co alloy containing nickel, iron and cobalt. It is designed for applications requiring extremely high dimensional stability.
Is Super Invar better than Invar 36?
Super Invar offers lower thermal expansion than standard Invar 36 within a limited temperature range, making it more suitable for high precision optical, scientific and measuring equipment applications.
Can SASA ALLOY provide custom size Super Invar plate?
Yes. SASA ALLOY can supply Super Invar plate in customized thickness, width, length, cut-to-size plate and machined plate according to customer requirements.
What certificate can be supplied with Super Invar?
EN 10204 3.1 material certificate can be supplied. Chemical composition, mechanical properties, heat number and traceability information can be provided according to order requirements.
What are the main applications of Super Invar?
Super Invar is mainly used for precision instruments, optical systems, aerospace fixtures, scientific equipment, metrology systems and high-stability tooling.
Contact Us
If you are looking for Super Invar Plate, Invar 32-5 or customized ultra low expansion alloy materials, please contact SASA ALLOY with your required grade, size, standard, surface condition, quantity and inspection requirements. Our team can provide professional material solutions for precision alloy applications.
