In high-precision electronics and aerospace applications, matching the thermal expansion of metal components with glass or ceramic parts is critical. Kovar Round Bars offer an ideal solution with their specially controlled low thermal expansion properties. Trusted by engineers, fabricators, and procurement teams across chemical, marine, aerospace, oil & gas, and power industries, these bars from Aurico Alloys LLP enable reliability, longevity, and performance where precision matters most.
Table of Contents:
Kovar (UNS K94610, ASTM F15, Alloy K) is an iron-nickel-cobalt alloy expertly engineered to maintain dimensional stability over varying temperatures. Its coefficient of thermal expansion closely matches glass and ceramic, making it essential for hermetic seals in electronic packages, vacuum tubes, aerospace instrumentation, and medical devices. Kovar also offers excellent corrosion resistance and machinability, supporting durable and precise fabrication.
Aurico Alloys LLP supplies Kovar round bars in multiple sizes ranging from 3mm to 150mm diameters with finishes including cold drawn, ground, polished, and bright annealed. Each batch is accompanied by comprehensive test certification to ASTM F15, full batch traceability, and compliant with EN, DIN, and ISO standards supporting global projects in aerospace, electronics, and chemical processing industries.
Compared to other alloys, Kovar’s unique balanced composition minimizes thermal stresses and improves seal integrity in electronic packaging and aerospace components, thereby reducing failure rates and maintenance costs. This proven material helps hardware stores, OEM manufacturers, and engineers confidently select the perfect alloy for critical environments.
High-quality Kovar Round Bars ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | Kovar (UNS K94610, ASTM F15, Alloy K) |
| Standards | ASTM F15 / AMS 7727 / DIN 17745 / Werkstoff 1.3981 |
| Diameter Range | 3mm – 150mm |
| Length | 100mm – 4000mm |
| Finish | Cold drawn, bright annealed, polished, ground |
| Delivery | Full MTC, batch traceability, export packaging |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | K94610 |
| Coefficient of expansion (30-400 °C) | 4.60-5.20 µm/m·°C (Acceptance limit per ASTM F15 Section 11.1 - not a typical value) |
| Coefficient of expansion (30-450 °C) | 5.10-5.50 µm/m·°C (Acceptance limit per ASTM F15 Section 11.1 - not a typical value) |
| Rod and bar specification | ASTM F15 / AMS 7727 |
Identifiers and physical constants for Kovar. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico Alloys LLP stocks Kovar round bars with varied diameters and finishes ready for fast shipping to electronics, aerospace, chemical, and marine projects globally with certified traceability and quality assurance.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Iron (Fe) | 53 nominal - adjusted to meet the Table 4 expansion limits | |
| Nickel (Ni) | 29 nominal - adjusted to meet the Table 4 expansion limits | |
| Cobalt (Co) | 17 nominal - adjusted to meet the Table 4 expansion limits | |
| Manganese (Mn) | — | 0.50 |
| Silicon (Si) | — | 0.20 |
| Carbon (C) | — | 0.04 |
| Aluminium (Al) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Magnesium (Mg) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Zirconium (Zr) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Titanium (Ti) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Copper (Cu) | — | 0.20 |
| Chromium (Cr) | — | 0.20 |
| Molybdenum (Mo) | — | 0.20 |
Composition for Kovar. Figures given as a range or a maximum are limits and those marked nominal are not; none of them are measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Density (g/cm³) | 8.1 |
| Tensile Strength (MPa) | 520 – 750 |
| Yield Strength (MPa) | 340 – 490 |
| Elongation (%) | 52 – 65 |
| Hardness (HB) | 123 – 321 |
| Melting Point (°C) | 1400 – 1450 |
| Coefficient of Thermal Expansion (10⁻⁶/°C) | 5.6 – 6.5 (20-400°C) |
Applications & Benefits
- Hermetic seals in electronic packages and integrated circuits
- Glass-to-metal seals in vacuum tubes, sensors, and aerospace components
- High precision instruments and medical devices requiring thermal expansion matching
- Telecommunications hardware and microwave tubes
- Chemical industry components exposed to thermal cycling
- Marine and aerospace structural parts requiring dimensional stability
FAQ & Industry Insights
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Kovar Round Bars from Aurico Alloys LLP provide the ultimate solutions for precision, thermal expansion matching, and certified quality in electronics, aerospace, marine, and chemical industries. Are your high-precision components secured with the trusted reliability of Kovar?