79NM (79NMP)

For cores of small transformers, chokes and relays.

For cores of small transformers, chokes and relays, operating in weak fields, magnetic shields. In small thicknesses (0.05 to 0.02 mm) — for cores of pulse transformers, magnetic amplifiers and solid-state relays

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Precision alloys	Soft Magnetic Precision Alloys

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Ti, %	Cu, %	Ni, %	Al, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Ti, %	Cu, %	Ni, %	Al, %	P, %	C, %	S, %	Mo, %
GOST 10994-74	13.73–16.8	0.3–0.5	0.6–1.1	< 0.15	< 0.2	78.5–80	< 0.15	< 0.02	< 0.03	< 0.02	3.8–4.1

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	210		8600	0.55
100		10.5

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Tape					490	145	50
Tape				cold-work	1030	980	3

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Tape		cold-work	210
Tape			120

Standards

Standard	Description
Standard	Description
GOST 10994-74

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
Al	%	Aluminium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$E\cdot 10^{9}$	$MPa$	Elastic modulus
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)
$\rho$	$\frac{kg}{m^3}$	The density of the material
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)