40KNM iron-based alloy doped with cobalt and nickel

Chemical composition

Fe	Iron	Rest
Co	Cobalt	24.5 — 26.0
Si	Silicon	<0.3
Mn	Manganese	0.3 — 0.6
Mo	Molybdenum	3.8 — 4.2
Ni	Nickel	39.3 — 40.7
S	Sulfur	<0.02
C	Carbon	<0.03
P	Phosphorus	<0.02

Domestic analogues

EP656

40NKMP (included in 2 standards)

For cores of constant inductance coils, filter chokes, broadband transformers; The alloy has anisotropy of magnetic properties, low residual magnetic induction and constant magnetic permeability in a wide range of fields. Technical requirements — according to GOST 10160−75 Precision magnetically soft alloys. Technical conditions GOST 10994−74 Precision alloys. Stamps.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Co, %	Ni, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Co, %	Ni, %	P, %	C, %	S, %	Mo, %
GOST 10994-74	28.13–32.1	< 0.3	0.3–0.6	24.5–26	39.3–40.7	< 0.02	< 0.03	< 0.02	3.8–4.2

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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	180		8550	0.55
100		11

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					540	145	50
Tape				cold-work	980	980	4

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Tape			110

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
Co	%	Cobalt
Ni	%	Nickel
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)