Product Description

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 

Payment Terms︰ T/T L/C

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