Kovar (ASTM F-15) expansion alloy strip ex-stock

Introduction

Kovar is a Ni-Fe alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular of the controlled expansion alloys for hermetic sealing applications.

Character

Kovar alloy is magnetic at all temperatures below the Curie point. Magnetic properties will depend upon heat treatment; the lower the hardness, the higher the permeability values and lower hysteresis loss.

Density: 8.36g/cm3

Curie Temp: 435°C(815°F)

Application

Kovar is widely used in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.

Equal grades

4J29(China grade), ASTM F-15, NILO K, Pernifer 2918, Rodar, Dilvar P1, UNS K94610, 29-17 alloy

Chemical composition

C≤0.020, Ni≤29.0, Si≤0.20, Mn≤0.30, Co≤17.0, Fe=remainder

Standards

ASTM F-15

Forms available at A-one Alloy

Plate, sheet, strip, wire, rod, bar, forging, tube, pipe, capillary, square pipe, and parts

Delivery

Huge stock of strip, bar and wire in stock. Fast delivery with 5 days for customized size. Delivery of other products please confirm with A-one Alloy.