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1.3981

Brand name

NILO® Alloy K, Pernifer® 2918, Korvar

Trade name

Alloy K

Standards

Material No.
1.3981
EN Designation
NiCo29-18
UNS
K94610
Alloy
K

Description

Alloy K / 1.3981 (Kovar) is a nickel-iron-cobalt alloy.

Special properties

Very low coefficient of expansion from -100° to 450°C.

Chemical Composition

C
%
≤ 0.05
Si
≤ %
0.03
Mn
≤ %
0.50
Ni
%
28.0-30.0
Co
%
17.0-18.0
Fe
%
Rest

Mechanical Properties 20°C

0.2% Yield strength Rp
≥ N/mm²
370
Tensile strength Rm
N/mm²
≥ 530
Elongation A5
≥ %
30
Modulus of elasticity
kN/mm²
160

Physical Properties 20°C

Density
g/cm³
8.3
Specific heat capacity
J/kg K
500
Thermal conductivity
W/m K
17.5
Electrical resistivity
Ω mm²/m
0.049

Suitable welding
filler materials

1.3981

Application

High-power transmitting valves, transistor leads and headers, integrated-circuit lead frames

Available forms for 1.3981 / ALLOY K

Sheets/Plates
Lieferform
Bars
Lieferform
Fittings
Lieferform
Forged / cast parts
Lieferform
Finished part (drawing)
Lieferform