Nitriding is a heat-treating process that diffuses nitrogen into the surface of a metal to create a case-hardened surface. The processes are thus similar to case-hardening but performed at a lower temperature. The advantage with nitriding is mainly the reduced distortion behavior compared to carburizing and still give a high surface strength and ductile core. However, since the process is performed at lower temperature, the same case depth as for carburizing will take considerable time to reach. Nitriding can also increase the corrosion resistance of a component. Typical applications are small gears, crank shafts and wear parts.

Ovako standard

EN-standard*

Typical analysis

 

 

C

Si

Mn

Cr

Mo

Ni

Other

225

18CrMnMo8-4*

0.2

0.3

0.9

1.9

0.5

0.3

 

277

16CrNiMo9-5-2*

0.2

0.1

1.3

2.2

0.5

0.5

V

327

40CrMo4

0.4

0.3

0.7

1.0

0.2

 

 

398

32CrMoV12

0.3

0.2

0.5

3.0

1.0

 

V

6130

21CrMoV5-7*

0.2

0.3

0.6

1.3

0.7

 

V

Hybrid 50

X10NiCrAlMoV5-5-2-1*

0.1

0.1

0.3

5.0

0.7

5.0

Al

Hybrid 55

X20NiCrAlMoV6-5-2-1*

0.2

0.1

0.3

5.0

0.7

6.0

Al, V

Hybrid 60

X20NiCrAlMoV6-5-2-1*

0.3

0.1

0.3

5.0

0.7

6.0

Al, V

This is a selection of our standard program. The steel grades above can all be made as BQ-Steel, IQ-Steel or M-Steel.

  • Designation followed by “F” is not an official EN standard grade but named according to the rules in EN 10027.

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Related Reading

STEEL GRADES

Quenching and Tempering Steel

Steels for quenching and tempering have a carbon level of 0.25-0.60% and can be both unalloyed and low-alloyed. Alloyed grades also contain chromium, nickel and molybdenum.

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STEEL GRADES

Spring Steel

Spring steel is used in the manufacture of springs for automotive and industrial suspension, generally using low-alloy manganese, medium/high-carbon steel with a very high yield strength.

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STEEL GRADES

Case-Hardening Steel

Steels for carburizing and case hardening typically have a relatively low carbon level, 0.10-0.25% C, and are used when there is a demand for varying properties, such as for components in transmissions.

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