20NiCrMo2-2

General Information

Ovako 152 is a high cleanliness case hardening steel used for bearing, transmission components and other highly stressed applications. There are three versions of the grade.

152A / 20NiCrMoS2 - variant with regulated sulphur content for enhanced machinability

152C / 20NiCrMo2 - variant with enhanced hardenability

152G / 20NiCrMo2 - Bearing Steel Quality (BQ) variant

BQ-Steel^®

(Bearing Quality) is a bearing quality clean steel optimized for fatigue strength by a strict control of steel cleanliness. BQ-steel is also ideal for new design solutions in a wide array of demanding applications outside the bearing industry that require longer performance and higher loads. The BQ-steel offer is the result of the Ovako clean steel program. Purity of production means that the material has significantly smaller inclusions compared to conventional steel and, as a result, the fatigue strength of the steel is increased dramatically. Use of the material allows components to be manufactured in smaller sizes. The BQ-steel has for decades been the problem-solver.

For additional Heat Treatment Data, please visit the Heat Treatment Guide.

BQ-Steel^®

BQ-steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

Similar designations

20NiCrMo2, 20NiCrMoS2, 8620, 8620H, 1.6522, 1.6523, 1.6526, SS2506

Variant	Cast	Di	Weldability		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %
152A	IC		CEV 0.65_max	Min	0.18	0.20	0.65	-	0.015	0.40	0.40	0.15
Pcm 0.38_max	Max	0.23	0.35	0.90	0.025	0.035	0.70	0.70	0.25
152C	IC	2.21	CEV 0.63_max	Min	0.21	0.25	0.84	-	0.008	0.56	0.55	0.18
Pcm 0.37_max	Max	0.23	0.35	0.90	0.025	0.015	0.60	0.60	0.21
152G	IC		CEV 0.64_max	Min	0.19	0.20	0.70	-	0.008	0.40	0.40	0.15
Pcm 0.37_max	Max	0.23	0.35	0.90	0.015	0.015	0.60	0.70	0.25
20NiCrMo2-2 +H	Std		CEV _max	Min	0.17	-	0.65	-	0.020	0.35	0.40	0.15
Pcm _max	Max	0.23	0.40	0.95	0.025	0.040	0.70	0.70	0.25
20NiCrMo2-2 EN ISO 683-3	Std		CEV _max	Min	0.17	0.15	0.65	0.000	0.000	0.35	-	0.15
Pcm _max	Max	0.23	0.40	0.95	0.025	0.035	0.70	-	0.25

Variant

Cast

Weldability

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

152A

CEV 0.65_max

Min

0.18

0.20

0.65

0.015

0.40

0.15

Pcm 0.38_max

Max

0.23

0.35

0.90

0.025

0.035

0.70

0.25

152C

2.21

CEV 0.63_max

Min

0.21

0.25

0.84

0.008

0.56

0.55

0.18

Pcm 0.37_max

Max

0.23

0.35

0.90

0.025

0.015

0.60

0.21

152G

CEV 0.64_max

Min

0.19

0.20

0.70

0.008

0.40

0.15

Pcm 0.37_max

Max

0.23

0.35

0.90

0.015

0.60

0.70

0.25

20NiCrMo2-2 +H

Std

CEV _max

Min

0.17

0.65

0.020

0.35

0.40

0.15

Pcm _max

Max

0.23

0.40

0.95

0.025

0.040

0.70

0.25

20NiCrMo2-2 EN ISO 683-3

Std

CEV _max

Min

0.17

0.15

0.65

0.000

0.35

0.15

Pcm _max

Max

0.23

0.40

0.95

0.025

0.035

0.70

0.25

Variant	Condition	Format	Dimension [mm]	Hardness
Rp_0.2 * R_eh, ** R_el
152A	+AR	Round bar	40 < 80	230 HB typical
+A	Round bar	40 < 80	212 HB typical
152G	+AR	Round bar	40 < 70	230 HB typical
+A	Round bar	40 < 70	212 HB typical

Variant

Condition

Format

Dimension [mm]

Hardness

Rp_0.2 * R_eh, ** R_el

152A

+AR

Round bar

40 < 80

230 HB typical

Round bar

40 < 80

212 HB typical

152G

+AR

Round bar

40 < 70

230 HB typical

Round bar

40 < 70

212 HB typical

	Temperature °C
MS	405
AC1	723
AC3	812

Temperature °C

405

AC1

723

AC3

812

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging	+U	800-1200C	In air
Normalizing	+N	860-890C	In air
Soft annealing	+SA	600-670 2h	In air
Carburizing	+C	850-930C Carbon potential se diagram
Quench & Tempering	+QT	Q/T 840-890C Hardening of as-carburized component 780-830C	In oil
Tempering	+T	160-250C	In air

Treatment

Condition

Temperature cycle

Cooling/quenching

Hot forging

800-1200C

In air

Normalizing

860-890C

In air

Soft annealing

+SA

600-670 2h

In air

Carburizing

850-930C Carbon potential se diagram

Quench & Tempering

+QT

Q/T 840-890C Hardening of as-carburized component 780-830C

In oil

Tempering

160-250C

In air

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

Youngs module (GPa)

Poisson´s ratio (-)

Shear module (GPa)

Density (kg/m3)

210

0.3

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)

460 - 480

40 - 45

0.20 - 0.25

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Material data sheet

Steel grade

20NiCrMo2-2

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

Heat Treatment Guide generated Graphs

Hardenability

Carburizing response - Ovako 152G

Other properties (typical values)

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