Cobalt 27KX alloy alloyed with nickel and chromium

For the manufacture of rotors and stators of electrical machines and other magnetic circuits operating at ordinary and high temperatures and under mechanical loads.

Classification

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

Chemical composition

Standard	Si, %	Mn, %	Co, %	Cr, %	Ni, %	P, %	C, %	S, %
Standard	Si, %	Mn, %	Co, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 10994-74	< 0.25	0.2–0.4	26.5–28	0.3–0.6	< 0.3	< 0.015	< 0.04	< 0.015

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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	220		7980	0.2
100		10.7

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					590	295	20
Tape				cold-work	1080		2

Magnetic properties

Rolling	$H_c$ , $A/m$	$\mu_{max}$ , $MH/m$	$B_{1000}$ , $T$
Rolling	$H_c$ , $A/m$	$\mu_{max}$ , $MH/m$	$B_{1000}$ , $T$
Tape	0.012–0.016	12000–14000	3300–3400

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Tape	GOST 10994-74	raw, cold rolling, thin, Transverse	210–220

Limit operating modes

Standard	Температура, °C
Standard	Температура, °C
GOST 10994-74	< 600

Analogues

Russia	USA
Russia	USA
Сплав ЭП685	Сплав Hiperco 27Alloy

Standards

Standard	Description
Standard	Description
GOST 10994-74
GOST 10160-75	GOST 10160-75

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Si	%	Silicon
Mn	%	Manganese
Co	%	Cobalt
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

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)

Description of magnetic properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$H_c$	$A/m$	Magnetic coercivity (not more)
$\mu_{max}$	$MH/m$	Magnetic permeability (not more)
$B_{1000}$	$T$	Magnetic induction (not less) in a magnetic field while magnetic field strength is 1000 A/m