Material data sheet Last revised: Thu, 11 Feb 2021 13:49:20 GMT
Steel grade
20MnCr5 All
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.
For additional Heat Treatment Data, please visit the Heat Treatment Guide.
Similar designations
20MnCrS5, 1.7147, 20MnCr4, 1.7149
Transformation temperatures
Temperature °C
MS 385
AC1 731
AC3 831
Heat treatment recommendations
Treatment Condition Temperature cycle Cooling/quenching
850 - 1 200 Slowly or in air
Hot forging
670 - 710 Slowly (15°C/h) until 600°C
Annealing +A
950 - 1 000 Quickly to following stage
+FP
630 - 650 Keeping about 3 hours, after that: in air
+FP
860 - 890 In air
Normalizing
650 - 680 In air
Stress relieve annealing
860 - 900 In air
Carburizing
830 - 870 Quenching in oil or water
Hardening
150 - 200 In air
Tempering
Hardenability
The hardenability is estimated from cast analysis. The hardenability can be verified with the end quench test if
agreed on enquire and order.Jominy hardenability of Ovako 236F: Measured average value with +/-standard
deviation.
Carburizing response Heat treatment
Other
properties
(typical values)
Steel cleanliness
Micro inclusions - steel grade 236F Macro inclusions - 236F
ISO 3763
Applied
ASTM E45 Applied standard
standard (Blue fracture)
Statistical testing on
Sampling ASTM A295 Sampling
billets.
A B C D
Maximum
Th He Th He Th He Th He
average Limits < 2,5 mm/dm2
limits
2.5 1.5 1.5 0.5 0 0 0.5 0.5
Micro inclusions - steel grade 236Q Macro inclusions - 236Q
ISO 3763 10 M Hz UST
Applied Applied
DIN 50602 K1 (Blue (Ovako internal
standard standard
fracture) procedure)
Sampling Six random samples from final product dimension Sampling Statistical testing on billets
The limit is dimension dependent. The average rating of six
< 10 defects/dm3
samples should not exceed the <1
Limits Limits
mm/dm2 > 0,2 mm FBH
limits given in the graph.
Youngs module (GPa) Poisson´s ratio (-) Shear module (GPa) Density (kg/m3)
210 0.3 80 7800
Average CTE 20-300°C Specific heat Thermal conductivity Ambient Electrical resistivityAmbient
(µm/m°K) capacity 50/100°C (J/kg°K) temperature (W/m°K) temperature (µΩm)
12 460 - 480 40 - 45 0.20 - 0.25
IQ Contact us
Would you like to know more about our offers? Don´t
hesitate to contact us:
Via e-mail: info@ovako.com
Via telephone: +46 8 622 1300
For more detailed information please
visit http://www.ovako.com/en/Contact-Ovako/
Disclaimer
The information in this document is for illustrative purposes only. The data and examples are only general recommendations and not a
warranty or a guarantee. The suitability of a product for a specific application can be confirmed only by Ovako once given the actual
conditions.The purchaser of an Ovako product has the responsibility to ascertain and control the applicability of the products before
using them. Continuous development may necessitate changes in technical data without notice. This document is only valid for Ovako
material. Other material, covering the same international specifications, does not necessarily comply with the properties presented in
this document.
