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Alloy 34НКД

Designation

Name The value
Designation GOST Cyrillic 34НКД
Designation GOST Latin 34HKD
Transliteration 34NKD
The chemical elements 34NiCoД

Description

Alloy 34НКД applies: for proizvodstva bars hot rolled and forged, forgings used for the manufacture of parts of instruments high precision, low CTE, requiring constancy of size and operating in the temperature range from minus 196 °C to plus 100 °C.

Standards

Name Code Standards
Sectional and shaped rolling В32 TU 14-1-5029-91
Metal forming. Forgings В03 TU 14-1-5048-91

Chemical composition

Standard C S P Mn Si Ni Fe Cu B Ti Co
TU 14-1-5029-91 ≤0.03 ≤0.01 ≤0.01 ≤0.1 ≤0.1 34-35 The rest 0.2-0.4 ≤0.008 ≤0.1 1.5-2
Fe is the basis.
According to TU 14-1-5029-91 the chemical composition is given for the alloy 34KKD-VI. Titanium and boron are introduced by calculation and chemical analysis are not determined, but the calculated data are recorded in the quality document. Deviations from the mass fraction of nickel minus 0,50% are allowed.

Physical characteristics

Temperature a, 10-6 1/°С
100 ≤10

A description of the physical symbols

Name Description
a The coefficient of linear expansion

Technological properties

Name The value
Microstructure The presence of a martensitic transformation when cooled to a temperature of minus 196 °C (frost) are not allowed.
Features of heat treatment Bars hot rolled and forged on the other 14-1-5029-91 are supplied without heat treatment. CTE is determined on samples annealed by mode: Quenching in water from 830-850 °C + Vacation at 290-310 °C (aging for 1 h) arbitrary cooling - with furnace or container.

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