Alloy 48NKH (ЭИ693)

Designation

Name The value
Designation GOST Cyrillic 48НХ
Designation GOST Latin 48HX
Transliteration 48NH
By chemical elements 48NiCr
Name The value
Designation GOST Cyrillic ЭИ693
Designation GOST Latin EI693
Transliteration EhI693
By chemical elements -

Description

Alloy 48NKH used: for the manufacture of vacuum-tight junctions with thermometric glass brands 16Ш, С72−4, etc.

Note

Alloy with an average value of CTE.
Alloy with a CTE (8,5−9,5)·10-6 deg-1 in the temperature range from -70 to + 450 °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
Bars and shapes В32 GOST 14082-78, TU 14-11-245-88
Steel pipes and fittings to them В62 GOST 14162-79, TU 14-159-165-87
Blanks. Of the workpiece. Slabs В31 TU 14-1-3904-84, TU 14-1-613-73
Pipes of ferrous metals and alloys, cast fittings to them В61 TU 14-3-225-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
GOST 10994-74 ≤0.05 ≤0.015 ≤0.015 0.3-0.6 0.7-1 ≤0.3 48-49.5 Rest ≤0.2
Fe is the basis.

Mechanical properties

Section, mm σU, MPa d5, %
Tubes of small dimensions (capillary) heat-treated or cold-worked in the state of delivery according to GOST 14162-79
≥392 ≥40
Cold-rolled steel strip according to GOST 14080-78 on delivery
0.1-2.5 ≤930 -

Description mechanical marks

Name Description
σU Limit short-term strength
d5 Elongation after rupture

Physical characteristics

Temperature r, kg/m3 a, 10-6 1/°C
20 8350 -
100 - 86
200 - 86
300 - 85
400 - 85
500 - 92
600 - 107
700 - 112
800 - 119

A description of the physical symbols

Name Description
Е The normal elasticity modulus
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
The temperature of the inflection point ≥410 °C