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
CIS, Russia, Ukraine Precision alloys Soft Magnetic Precision Alloys

Chemical composition

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

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
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
Tape 590 295 20
Tape cold-work 1080 2

Magnetic properties

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
Tape GOST 10994-74 raw, cold rolling, thin, Transverse 210–220

Limit operating modes

Standard Температура, °C
GOST 10994-74 < 600

Analogues

Russia USA
Сплав ЭП685 Сплав Hiperco 27Alloy

Standards

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

Description of chemical elements

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
$$E\cdot 10^{9}$$ $$MPa$$ 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
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\sigma_{P}$$ $$MPa$$ Proportionality limit
$$\epsilon_L$$ % Elongation at break (longitudinal)

Description of magnetic properties

Parameter Units of measurement Description
$$H_c$$ $$A/m$$ 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