9 CR CoFeCr Soft Magnetic Alloy with high magnetic saturation and improved corrosion resistance

9 CR soft magnetic alloy is a cost-optimized cobalt-iron-chromium alloy with a higher saturation magnetic induction and significantly improved corrosion resistance compared to other cobalt-iron alloys.

Due to the high resistivity and high magnetic saturation, 9 CR alloy has better switching times and higher actuation than conventional chrome steels.

With these unique properties, 9 CR alloy is suitable for components and actuators with special requirements for corrosion resistance, such as gasoline or biofuel injectors in the automotive industry or solenoid valves for corrosive media operating with short switching times and high pressures.

Chemical composition

MAIN PROPERTIES

Saturation polarization of J_S = 1.80 T

High electrical resistivity of ρe= 0.79 µΩm

Excellent corrosion resistance in comparison to other CoFe alloys.

Cost-optimized CoFe alloy with low cobalt content of 9 wt%

TYPICAL APPLICATIONS

Actuator and solenoid valve applications in corrosive media

Physical properties

Density ρ:7.75g/cm³

Thermal conductivity (25 °C) λ:20W(m.K)

Thermal expansion coefficient (20-100°C)α:10.9x10^-6/K

Electrical resistivity ρ_e:0.79 μΩm

STATIC MAGNETIC PROPERTIES

Coercivity H_C:130 A/m

Saturation polarization Js: 1.80 T

Saturation magnetization BS at H = 40 kA/m:1.85T

Maximum permeability µ_max:3,000

Magnetostriction constant λ_S:+30PPM

Curie temperature T_C:800°C

Typical magnetic properties

Mechanical properties (final annealed)

Young's modulus E: 180 GPa

Yield strength Rp_0.2: 330 MPa

Tensile strength Rm: 490 MPa

Elongation A: 35%

Hardness: HV 170

Mechanical properties (hot rolled)

Yield strength Rp_0.2: 410MPa

Tensile strength R_m: 600MPa

Elongation A: 30%

Hardness: HV 240

Forms of supply

• Solid rods, diameters 12.5 – 100 mm

• Wire material, diameters 0.2-12 mm