X20NiCrAlMoV6-5-2-1*

General Information

Hybrid Steel® is a low carbon steel containing a number of carefully controlled alloying elements, most importantly nickel, chromium, aluminium, molybdenum and vanadium. These enable it to develop its full properties after aging at elevated temperature (500–620°C). The chromium and aluminium content also improves corrosion resistance. The variant 197A is offered under the name Hybrid Steel 50 and the variant 297A is offered under the name Hybrid Steel 55 and the variant 397A is offered under the name Hybrid Steel 60.

Hybrid Steel 50 - Engineering steel.

Hybrid Steel 55 - Engineering steel.

Hybrid Steel 60 - Bearing steel.

Maximum hardess after aging: Hybrid Steel 50, 50HRC. Hybrid Steel 55, 55HRC. Hybrid Steel 60, 60HRC.

Hybrid Steel offers superior mechanical and fatigue strength compared to conventional steel grades at elevated temperatures.

Excellent elevated temperature strength
Flexible hardness, achieved by an aging treatment in the temperature range 500–620°C
Extremely good dimensional stability when aging is applied
High uniformity of properties also for large components
Good weldability, no preheating necessary
Corrosion resistance comparable to AISI 440C

The density for these grades is 7582 kg/m3.

* Designation followed by "*" is not an official EN standard grade but named according to the rules in EN 10027.

Similar designations

X20NiCrAlMoV6-5-2-1, X30NiCrAlMoV6-5-2-1 , Ovako197A, Ovako297A, Ovako397A

Variant	Cast		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	V %	Al %
Hybrid Steel 50, 197A	IC	Min	0.01	-	0.15	-	-	4.80	4.80	0.60	-	2.000
Max	0.12	0.20	0.50	0.015	0.001	5.20	5.20	0.80	0.100	2.400
Hybrid Steel 55, 297A	IC	Min	0.16	-	0.20	-	-	4.80	5.80	0.60	0.450	2.000
Max	0.20	0.20	0.50	0.015	0.001	5.20	6.20	0.80	0.550	2.400
Hybrid Steel 60, 397A	IC	Min	0.25	-	0.20	-	-	4.80	5.80	0.60	0.450	2.000
Max	0.31	0.20	0.50	0.015	0.001	5.20	6.20	0.80	0.550	2.400

Variant

Cast

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

V %

Al %

Hybrid Steel 50, 197A

Min

0.01

0.15

4.80

0.60

2.000

Max

0.12

0.20

0.50

0.015

0.001

5.20

0.80

0.100

2.400

Hybrid Steel 55, 297A

Min

0.16

0.20

4.80

5.80

0.60

0.450

2.000

Max

0.20

0.50

0.015

0.001

5.20

6.20

0.80

0.550

2.400

Hybrid Steel 60, 397A

Min

0.25

0.20

4.80

5.80

0.60

0.450

2.000

Max

0.31

0.20

0.50

0.015

0.001

5.20

6.20

0.80

0.550

2.400

Variant	Condition	Format	Yield strength min [MPa]	Tensile strength [MPa]	Elongation A₅ [%]	Hardness
Rp_0.2 * R_eh, ** R_el
Hybrid Steel 50, 197A	+AR	All formats	847	1151 typical	14.11	350 HV typical
+AG, at 450°C	All formats	1102	1355 typical	13.32	430 HV typical
+AG, at 550°C	All formats	1431	1582 typical	4.01	500 HV typical
Hybrid Steel 55, 297A	+AR	All formats	1136	1515 typical	12.89	450 HV typical
+AG, at 450°C	All formats	1320	1639 typical	11.27	500 HV typical
+AG, at 550°C	All formats	1706	1890 typical	10	600 HV typical
Hybrid Steel 60, 397A	+AR	All formats	1283	1819 typical	12.18	560 HV typical
+AG, at 450°C	All formats	1504	1918 typical	11.53	600 HV typical
+AG, at 550°C	All formats	1803	2405 typical	3.52	700 HV typical

Variant

Condition

Format

Yield strength min [MPa]

Tensile strength [MPa]

Elongation A₅ [%]

Hardness

Rp_0.2 * R_eh, ** R_el

Hybrid Steel 50, 197A

+AR

All formats

847

1151 typical

14.11

350 HV typical

+AG, at 450°C

All formats

1102

1355 typical

13.32

430 HV typical

+AG, at 550°C

All formats

1431

1582 typical

4.01

500 HV typical

Hybrid Steel 55, 297A

+AR

All formats

1136

1515 typical

12.89

450 HV typical

+AG, at 450°C

All formats

1320

1639 typical

11.27

500 HV typical

+AG, at 550°C

All formats

1706

1890 typical

600 HV typical

Hybrid Steel 60, 397A

+AR

All formats

1283

1819 typical

12.18

560 HV typical

+AG, at 450°C

All formats

1504

1918 typical

11.53

600 HV typical

+AG, at 550°C

All formats

1803

2405 typical

3.52

700 HV typical

	Temperature °C
MS	350
AC1	800
AC3	950

Temperature °C

350

AC1

800

AC3

950

Treatment	Condition	Temperature cycle	Cooling/quenching
As-rolled	+AR	Hybrid steel 50, Hardness 350HV
Soft annealing	+A	Hybrid Steel 50, 800°C/3h, Hardness 260HV	Slow cooling from 800°C to 600°C, <20°C/h
Hardening	+Q	Hybrid Steel 50, 950°C /45 min, Hardness 350HV	Air cool or quench in oil
Aging	+AG	Hybrid Steel 50, 500-620°C 1-20h. Hardness 300-500HV
As-rolled	+AR	Hybrid steel 55, Hardness 450HV
Soft annealing	+A	Hybrid Steel 55, 800°C/3h, Hardness 280HV	Slow cooling from 800°C to 600°C, <20°C/h
Hardening	+Q	Hybrid Steel 55, 950°C /45 min, Hardness 450HV	Air cool or quench in oil
Aging	+AG	Hybrid Steel 55, 500-620°C 1-20h. Hardness 400-600HV
As-rolled	+AR	Hybrid Steel 60, Hardness 550HV
Soft annealing	+A	Hybrid Steel 60, 800°C/3h, Hardness 300HV	Slow cool from 800°C to 600°C <20°C/h
Hardening	+Q	Hybrid Steel 60, 1020°C/45 min, Hardness 550HV	Air cool or quench in oil
Aging	+AG	Hybrid Steel 60, 500-620°C 1-20h, Hardness 430-700HV

Treatment

Condition

Temperature cycle

Cooling/quenching

As-rolled

+AR

Hybrid steel 50, Hardness 350HV

Soft annealing

Hybrid Steel 50, 800°C/3h, Hardness 260HV

Slow cooling from 800°C to 600°C, <20°C/h

Hardening

Hybrid Steel 50, 950°C /45 min, Hardness 350HV

Air cool or quench in oil

Aging

+AG

Hybrid Steel 50, 500-620°C 1-20h. Hardness 300-500HV

As-rolled

+AR

Hybrid steel 55, Hardness 450HV

Soft annealing

Hybrid Steel 55, 800°C/3h, Hardness 280HV

Slow cooling from 800°C to 600°C, <20°C/h

Hardening

Hybrid Steel 55, 950°C /45 min, Hardness 450HV

Air cool or quench in oil

Aging

+AG

Hybrid Steel 55, 500-620°C 1-20h. Hardness 400-600HV

As-rolled

+AR

Hybrid Steel 60, Hardness 550HV

Soft annealing

Hybrid Steel 60, 800°C/3h, Hardness 300HV

Slow cool from 800°C to 600°C <20°C/h

Hardening

Hybrid Steel 60, 1020°C/45 min, Hardness 550HV

Air cool or quench in oil

Aging

+AG

Hybrid Steel 60, 500-620°C 1-20h, Hardness 430-700HV

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

X20NiCrAlMoV6-5-2-1*

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

Heat Treatment Guide generated Graphs

Hybrid Steel

Yield Strength at Elevated Temperatures

Aging Characteristics

Fracture Toughness (K1C)

Nitiriding

Oxidation Resistance

Corrosion Resistance

Welding

Distortion Hybrid Steel 55

Machining recommendations Hybrid Steel 55

Thermal Properties

Other properties (typical values)

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