KOVAR Control expasnion alloy ASTM F15
Also known as Rodar, Kovar is a registered trademark that refers to a low expansion alloy that is composed of iron, nickel, cobalt and trace amounts of the elements manganese, silicone and carbon. Kovar was specifically formulated as a sealing alloy for glass and ceramic materials (specifically for compatibility with the thermal expansion characteristics of borosilicate glass).
The alloy is first melted using Vacuum Induction Melting (VIM) techniques. A secondary melt operation, Electro Slag Remelt (ESR), is then employed to further remove impurities and improve overall homogeneity.
| Commerical Trdae Name |
KOVAR |
| Material |
Nickel-Cobalt-Iron Alloy |
| Specification |
ASTM F15-04(2013) UNS K94610 |
| Melting |
VIM+ESR |
| Application |
hard glass to metal seals |
FORMS MANUFACTURED
| Forms |
Dimension Range |
Condition |
| Rod |
DIA≤500MM |
Hot-Rolled or Forged |
| Strip |
T0.015MM，Width650Max |
Cold-Rolled |
| Sheet |
T1.0MM，Width1500Max |
Cold-Rolled or Hot-rolled |
| Plate |
T6.0MM，Width2500Max |
Hot-Rolled |
| Wire |
DIA≥0.1MM |
Cold-drawn |
Chemical Composition，%
| Ni |
Co |
Si |
Mn |
C |
Al |
Mg |
Zr |
Ti |
Cu |
Cr |
Mo |
Fe |
| 28.5-29.5 |
16.8-17.8 |
≤0.2 |
≤0.5 |
≤0.04 |
≤0.1 |
≤0.1 |
≤0.1 |
≤0.1 |
≤0.2 |
≤0.2 |
≤0.2 |
Bal |
Physical Properties
| Density, lb/cu in |
0.302 |
| Specific Gravity |
8.36 |
| Curie Temp,°C |
435 |
| Melting Point,°C |
1449 |
| Electrical Resistivity,mm2/m |
49 |
| Thermal Conductivity,BTU-in/sq. ft-hr- |
120 |
| Specific Heat ,ppm/°C (25°C to 450°F) |
5.3 |
Coefficients of Thermal Expansion
| Temperature Range, °C |
Average Linear Coefficient of Thermal Expansion, µm/m·°C |
| 300 to 400 |
4.6-5.2 |
| 300 to 450 |
5.1-5.5 |
Typical Coefficient of Thermal Expansion
| Temperature Range, °C |
Average Linear Coefficient of Thermal Expansion, µm/m·°C |
| 300 to 400 |
5.0 |
| 300 to 450 |
5.3 |
Typical Mechanical Properties
|
Tensile Strength
Rm MPa
|
Yield Strength
Rp0.2 MPa
|
Elongation
A/%
|
Reduction Section
Z/%
|
Hardness
Hv
|
| 548 |
385 |
42.5 |
78 |
166 |
Important Notice
1. Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only.
2. Sample Policy
Kovar are available in many shapes and dimensions,supplying semi-finished products in forms of Strip,plate & Rods.The samples are big enough (typically about 200mm in length for strip or plate) to get an understanding of the material characteristics, meanwhile custom-made sample order available ! small quantity accepted.
3. Payment Terms
30% T/T in advance ,balance before shippment.
4. Who you talking to
Mr. Paul (Designation :Foreign Trade Manager)
WeChat & Phone No: +86 (0)13669288752 (24 Hours)
Skype: alloynickel
Tel: +86 29 3366 9103 ( 08:30-17:30,Beijing Time. Mr.Paul ,Excellent Engilsh & Mandarin)
Fax: +86 29 3369 8670
Http:// www.alloynickel.com
