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Rulon Bearings

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Ovako 20MnCr5 236F Steel
Categories: Metal; Ferrous Metal; Alloy Steel

Material Notes: General Information:20MnCr5 is a case-hardening steel with low carbon content but good hardenability reaching good wear resistance due to high surface hardness after hardening. The small grain size benefits in good ductility and fatigue strength. Suitable for gearboxes and axle gears. Ovako 236F is a standard variant with controlled sulphur content for consistent machining properties. Ovako 236Q is an IQ (isotropic quality) variant.

IQ-Steel: (Isotropic Quality) is an isotropic quality ultra clean steel. IQ-Steel is optimized for fatigue strength by a strict control of steel cleanliness. IQ-Steel, a further development of BQ-Steel, is an isotropic and ultra clean steel with properties that match re melted steels. Based on thousands of examinations by Ovako into the effects of defects on fatigue performance, the metallurgy of IQ-Steel is purer and far more consistent than conventional grades, and designed specifically to perform well in multi axial loading. This enables the manufacturing of lighter, slimmed down components like gears, bearings and other critical parts. The steels are helping our customers to achieve new design solutions and implement higher standards of finished product performance. Key to these practical advantages are Ovako’s own unique, clean and consistent modern steelmaking processes that remove harmful inclusions and impurities from within the steel. IQ-Steels contain smaller and more fragmented inclusions and can handle much higher mechanical forces in all directions than conventional steels. IQ-Steels are newer, but already now well established in high pressure automotive applications. Modern diesel engines, with high and cyclic injection pressures, have proven to be an ideal application. Transmission components are another emerging area of strong interest.

Information provided by Ovako

Key Words: 20MnCrS5, 1.7147, 20MnCr4
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Physical PropertiesOriginal ValueComments
Density 7.80 g/cc
 
Mechanical PropertiesOriginal ValueComments
Modulus of Elasticity 210 GPa
Poissons Ratio 0.30
Shear Modulus 80.0 GPa
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.00000200 - 0.00000250 ohm-cm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 12.0 µm/m-°C
@Temperature 20.0 - 300 °C
Specific Heat Capacity 0.460 - 0.480 J/g-°C
@Temperature 50.0 - 100 °C
Thermal Conductivity 40.0 - 45.0 W/m-KAmbient temperature
Transformation Temperature 385 °CMS
 731 °CAC1
 831 °CAC3
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 0.020 - 0.040 %
Carbon, C 0.17 - 0.22 %
Chromium, Cr 1.1 - 1.3 %
Iron, Fe 96.41 - 97.4 %As Balance
Manganese, Mn 1.1 - 1.3 %
Molybdenum, Mo <= 0.080 %
Nickel, Ni <= 0.25 %
Phosphorus, P <= 0.025 %
Silicon, Si 0.20 - 0.35 %
Sulfur, S 0.015 - 0.025 %
 
Descriptive Properties
WeldabilityCEV 0.79max
 Pcm 0.4max

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NOVAKO132 / 234431

Master Bond adhesives

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