Case hardening entails the treatment of a finished component in a carburizing atmosphere at a high temperature, typically 850–950°C, which increases the carbon content at the surface of the component. The carburized layer is typically 0,5–1,0 mm deep but can be deeper. Following carburization, the part is quenched and thereby hardened. During quenching the carburized layer is transformed to martensite with hardness determined by the carbon content. The result is thus a component with a hard surface and a comparably soft core. Typical components made out of carburizing steel, are gears in transmissions.

 

EN-standard

Ovako

Typical analysis

   

C

Si

Mn

Cr

Mo

Ni

Other

16MnCr5

234, 4306

0.16

0.2

1.2

1.0

 

 

 

20MnCr5

236, 4326

0.20

0.2

1.3

1.2

 

 

 

18CrMo8-5*

225

0.18

0.3

0.8

1.8

0.5

 

 

20MoCr4

124

0.20

0.2

0.8

0.5

0.4

 

 

20NiCrMo2-2

152, 4548

0.20

0.3

0.9

0.6

0.2

0.5

 

16NiCrS4

146, 4730

0.16

0.1

1.0

1.1

 

0.8

 

20NiCrMo7

157

0.20

0.2

0.6

0.5

0.2

1.7

 

18CrNiMo7-6

159, 4761

0.18

0.2

0.7

1.7

0.3

1.6

 

12NiCr14-6*

245

0.13

0.3

0.5

1.5

0.1

3.3

 

18NiCrMo14-6

255

0.18

0.3

0.5

1.4

0.2

3.3

 

22NiCrMo12-5*

253

0.14

0.2

0.6

1.2

0.2

2.9

 

24NiCrMo15-5*

256

0.24

0.3

0.7

1.2

0.3

3.6

 

20NiMo9-7*

158

0.20

0.1

0.3

0.4

0.7

2.3

 

30MoCrV20-7*

499

0.30

0.2

0.3

1.7

1.8

 

V

16CrMnNiMo9-5-2*

277

0.16

0.2

1.3

2.1

0.5

0.5

V

EN-standard designation followed by “*” is not an official EN standard grade but named according to the rules in EN 10027.

 

 

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