Alloy 34НКД

Designation

Name	The value
Designation GOST Cyrillic	34НКД
Designation GOST Latin	34HKD
Transliteration	34NKD
By 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
Bars and shapes	В32	TU 14-1-5029-91
Processing of metals by pressure. 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	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/°C
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.