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Last revised: Wed, 04 Dec 2024 16:05:49 GMT

20MnCr5

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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®

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 %
236Q	IC		CEV 0.73_max	Min	0.17	0.10	1.10	-	-	1.00	0.10	-	-	0.050
236Q	IC		Pcm 0.38_max	Max	0.22	0.25	1.30	0.025	0.002	1.20	0.25	0.08	0.25	0.200
236F	IC		CEV 0.79_max	Min	0.17	0.20	1.10	-	0.015	1.10	-	-	-	0.020
236F	IC		Pcm 0.4_max	Max	0.22	0.35	1.40	0.025	0.025	1.30	0.25	0.08	0.30	0.040
MC212	CC	3.11	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
20MnCr5 +H EN ISO 683-3	Std		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

Heat treatment recommendations

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging		850 - 1 200	Slowly or in air
Annealing	+A	670 - 710	Slowly (15°C/h) until 600°C
	+FP	950 - 1 000	Quickly to following stage
	+FP	630 - 650	Keeping about 3 hours, after that: in air
Normalizing		860 - 890	In air
Stress relieve annealing		650 - 680	In air
Carburizing		860 - 900	In air
Hardening		830 - 870	Quenching in oil or water
Tempering		150 - 200	In air

Heat Treatment Guide generated Graphs

The following graphs are generated from a theoretical model. For further info see the Heat treatment guide module. Select a specific grade version for individual display.

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

Steel cleanliness

Micro inclusions - steel grade 236F									Macro inclusions - 236F
Applied standard	ASTM E45								Applied standard		ISO 3763 (Blue fracture)
Sampling	ASTM A295								Sampling		Statistical testing on billets.
Maximum average limits	A		B		C		D		Limits		< 2,5 mm/dm²
	Th	He	Th	He	Th	He	Th	He
	2.5	1.5	1.5	0.5	0	0	0.5	0.5

Micro inclusions - steel grade 236Q									Macro inclusions - 236Q
Applied standard	DIN 50602 K1								Applied standard	ISO 3763 (Blue fracture)	10 M Hz UST (Ovako internal procedure)
Sampling	Six random samples from final product dimension								Sampling	Statistical testing on billets
Limits	The limit is dimension dependent. The average rating of six samples should not exceed the limits given in the graph.								Limits	< 1 mm/dm²	< 10 defects/dm³ > 0,2 mm FBH

IQ

SUSTAINABILITY-ENVIRONMENTAL IMPACT DATA

At Ovako sustainability and reduction of our environmental impact is a major focus in everything we do.
Further information is found here.

Steel works	Hofors	Smedjebacken	Imatra
CO2e/kg	120	62	76

To get the full picture of our products environmental impact we have to look at all of our CO₂ emission sources.
Not only the steel work Scope 1-2 itself, but all operations downstream in our production, heating and heat treatment furnaces etc (full scope 1-2) as well as all the emission from input material, eg. alloys, scope 3.

Steel Grade	Format	Condition	Scope 1-3 (CO2e kg /1000 kg steel)	Climate compensated Net emission = Scope 3 (CO2e kg /1000 kg steel) Scope 1 - 2 = 0 (compensated)
236	Round bar	+AR	608	209
236	Round bar	+FP	612	211
236	Tube,wall	+AR	630	232
236	Tube,wall	+FP	632	235

Other properties (typical values)

Youngs module (GPa)	Poisson´s ratio (-)	Shear module (GPa)	Density (kg/m3)
210	0.3	80	7800
Average CTE 20-300°C (µm/m°K)	Specific heat capacity 50/100°C (J/kg°K)	Thermal conductivity Ambient temperature (W/m°K)	Electrical resistivityAmbient temperature (µΩm)
12	460 - 480	40 - 45	0.20 - 0.25

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.

General information
Chemical composition
Transformation temp.
Heat treatment
HTG Graphs
Hardenability
Sustainability