20 MN CR 5
20 MN CR 5
20 MN CR 5
All
20MnCr5
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.
IQ-Steel®
IQ-Steel® is an isotropic quality ultra clean steel optimized for high fatigue strength under multi axial loading.
Similar designations
20MnCrS5, 1.7147, 20MnCr4, 1.7149
Chemical composition
Variant Cast Di Weldability C% Si % Mn % P % S% Cr % Ni % Mo % Cu % Al %
CEV 0.73max Min 0.17 0.10 1.10 - - 1.00 0.10 - - 0.050
236Q IC
Pcm 0.38max Max 0.22 0.25 1.30 0.025 0.002 1.20 0.25 0.08 0.25 0.200
CEV 0.79max Min 0.17 0.20 1.10 - 0.015 1.10 - - - 0.020
236F IC
Pcm 0.4max Max 0.22 0.35 1.40 0.025 0.025 1.30 0.25 0.08 0.30 0.040
CEV max Min 0.17 0.15 1.10 - - 1.00 - - - 0.020
MC212 CC 3.11
Pcm max Max 0.22 0.40 1.40 0.025 0.035 1.30 - - 0.30 0.040
CEV max Min 0.17 0.15 1.10 - - 1.00 - - - -
20MnCr5 +H EN ISO 683-3 Std
Pcm max Max 0.22 0.40 1.40 0.025 0.035 1.30 - - 0.40 -
Transformation temperatures
Temperature °C
MS 385
AC1 731
AC3 831
500
236Q 20MnCr5
236F 20MnCr5
400
Hardness (Hv)
300
200
100
0
100 200 300 400 500 600 700
236Q 20MnCr5 - Rm
1500 236Q 20MnCr5 - Rp.02
236F 20MnCr5 - Rm
236F 20MnCr5 - Rp.02
Strength (MPa)
1000
500
0
100 200 300 400 500 600 700
400
Hardness (Hv)
300
200
100
0
0 10 20 30 40 50
Depth (mm)
Hardenability
50
40
Hardness, HRC
30
20
10
0
10 20 30 40 50
Distance, mm
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.
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
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
IQ
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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.