mg steel® – MG technical ceramics GmbH & Co. KG

Steel as a material

High-speed spindle bearings, axial angular contact ball bearings (ZKLN) or thin section bearings

The precision of the spindle is crucial for the performance of a machine tool.

HQW

High speed spindle bearings

The precision of the spindle is crucial for the performance of a machine tool.

Axial angular contact ball bearings (ZKLN)

ZKLN bearings from HQW are double row angular contact thrust ball bearings with a contact angle of 60°.

Thin section bearings

For high performance applications where space and weight are important.

Comparison of mechanical and thermal properties

The table shows the typical material properties and serves as a comparison. This is not absolute engineering data for which we assume legal responsibility.

Characteristics	Ceramics	Tungsten carbide	Steel
Density	3.23 g/cm³	14.95 g/cm³	7.8 g/cm³
Hardness	~ 76 HRc	~ 76 HRc	~ 60-67 HRc
Flexural Strength(3 pt. 20°C)	1000 MPa	2600 MPa	2000 MPa (Zug)
Compressive strength	> 4000 MPa	6200 MPa	1400 MPa
Young's modulus	310 GPa	650 GPa	205 GPa
Poisson's ratio	0.27	0.22	0.29
Fracture toughness	7 MPa-√m	12 MPa-√m	70 MPa-√m
Thermal expansion	3.0 x 10-6/°C	5 x 10-6/°C	12.5 x 10-6/°C
Thermal conductivity	22 W/m-°C	100 W/m-°C	37 W/m-°C
Specific heat	0.68 J/g-°C	0.34 J/g-°C	0.50 J/g-°C
max. service temperature	1000 °C	450 °C	180 °C

Characteristics	Ceramics
Density	3.23 g/cm³
Hardness	~ 76 HRc
Flexural Strength(3 pt. 20°C)	1000 MPa
Compressive strength	> 4000 MPa
Young's modulus	310 GPa
Poisson's ratio	0.27
Fracture toughness	7 MPa-√m
Thermal expansion	3.0 x 10-6/°C
Thermal conductivity	22 W/m-°C
Specific heat	0.68 J/g-°C
max. service temperature	1000 °C

Characteristics	Tungsten carbide
Density	14.95 g/cm³
Hardness	~ 76 HRc
Flexural Strength(3 pt. 20°C)	2600 MPa
Compressive strength	6200 MPa
Young's modulus	650 GPa
Poisson's ratio	0.22
Fracture toughness	12 MPa-√m
Thermal expansion	5 x 10-6/°C
Thermal conductivity	100 W/m-°C
Specific heat	0.34 J/g-°C
max. service temperature	450 °C

Characteristics	Steel
Density	7.8 g/cm³
Hardness	~ 60-67 HRc
Flexural Strength(3 pt. 20°C)	2000 MPa (Zug)
Compressive strength	1400 MPa
Young's modulus	205 GPa
Poisson's ratio	0.29
Fracture toughness	70 MPa-√m
Thermal expansion	12.5 x 10-6/°C
Thermal conductivity	37 W/m-°C
Specific heat	0.50 J/g-°C
max. service temperature	180 °C

Further information

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