Alloy 38NKD (38NKD-VI)

Designation

Name The value
Designation GOST Cyrillic 38НКД
Designation GOST Latin 38HKD
Transliteration 38NKD
By chemical elements 38NiCoД
Name The value
Designation GOST Cyrillic 38НКД-ВИ
Designation GOST Latin 38HKD-BI
Transliteration 38NKD-VI
By chemical elements 38NiCoД-ВIr

Description

Alloy 38NKD used: for the manufacture of vacuum-tight junctions with glass marks P-6, С72−4 and sapphire.

Note

Alloy with an average value of CTE.
Alloy with a CTE (7,0−7,8)·10-6 deg-1 in the temperature range from minus 60 to plus 400 °C.

Standards

Name Code Standards
Classification, nomenclature and General rules В30 GOST 10994-74
Tape В34 GOST 14080-78
Wire, steel, alloy В73 GOST 14081-78, TU 14-1-3177-81
Bars and shapes В32 GOST 14082-78, TU 14-11-245-88
Blanks. Of the workpiece. Slabs В31 TU 14-1-3904-84

Chemical composition

Standard C S P Mn Si Ni Fe Cu Co
GOST 10994-74 ≤0.05 ≤0.015 ≤0.015 ≤0.4 ≤0.3 37.5-38.5 Rest 4.5-5.5 4.5-5.5
Fe is the basis.

Physical characteristics

Temperature r, kg/m3 a, 10-6 1/°C
20 8200 -
-100 - 84
-80 - 84
-60 - 84
-40 - 84
-20 - 85
100 - 86
200 - 81
300 - 79
400 - 78
500 - 88
600 - 101
700 - 115
800 - 120

A description of the physical symbols

Name Description
r Density
a The coefficient of linear expansion

Technological properties

Name The value
The temperature of the inflection point ≥390 °C