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Wire, circle, covar® wire - 1.3981

Wire, circle, covar® wire - 1.3981

AvekGlob Company sells a wide range of rolled products (circle, bar, wire) at reasonable prices from the manufacturer, which is produced from the precision alloy Kovar®, (1.3981). The supplier guarantees the timely delivery of products to any address specified by the consumer.

Composition and application

This alloy belongs to the group of iron-nickel-cobalt alloys with a low coefficient of thermal expansion. The composition of the alloy is controlled within narrow limits to ensure accurate uniform properties of thermal expansion. Alloy grade Covar®, (1.3981) is used to produce sealed seals of various metals with glasses or ceramic materials.

The effectiveness of the application of the alloy in question is due to the fact that its expansion coefficient, which decreases with increasing temperature to the inflection point, corresponds to the rate of expansion of borosilicate glasses and alumina ceramics.

The alloy is also widely used in power and microwave tubes, transistors and diodes. In most Covar® integrated circuits, (1.3981) is used as a flat packing material and dual-channel packages.

The chemical composition of the alloy, which meets the technical requirements of the UNS K94610 standard, is presented in the table (iron — the rest):

Element C,% P,% S,% Mn,% Si,% Cu,% Cr,% Mo,% Ni,% Co,%
Content Not more than 0.03 Not more than 0.020 Not more than 0.020 Not more than 0.50 Not more than 0.30 Not more than 0.20 Not more than 0.20 Not more than 0.20 28.5… 29.5 16.8… 17.8

Buy at a reasonable price from the manufacturer of a circle, bar or wire from the alloy brand Covar®, (1.3981) offers the company AvekGlob. The supplier provides a guaranteed delivery of rolled metal to any point specified by the customer.


Basic physical characteristics of the alloy:

Density, kg / m 3 — 8170;

Melting point, 0 С — 1449;

The coefficient of thermal expansion in the temperature range 20… 800 0 С, μm / deg — 10,2;

Coefficient of thermal conductivity, W / megade — 17.3;

Modulus of elasticity, GPa — 138.

Basic mechanical characteristics of the alloy:

The limit of temporary resistance, MPa — 580… 720;

Yield strength, MPa — 320… 350;

Relative elongation,% — 30;

Rockwell hardness (scale B) — not more than 68.

Technological features of the alloy: the material is magnetic at temperatures below the Curie point (453 ° C). Mechanical machinability is good, the temperature range of forging is 780… 920 0 С.

Company Avecglob proposes to purchase at affordable prices from the manufacturer a circle, bar or wire, which are made of the alloy Covar®, (1.3981). The supplier ensures the immediate delivery of products to any point agreed by the customer.