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Variants

Material data sheet

Steel grade

  • Ovako255
Last revised: Thu, 30 Jan 2020 15:57:58 GMT

General Information

Ovako 255 is a case hardening steel with high toughness used for bearing and transmission components. There are two different versions of the grade with high cleanliness requirements. The high hardenability ensures a through hardenability of large sections.

Variant 255G - Bearing quality (BQ) variant with low sulphur content and high cleanliness demands

Variant 255Q - Isotropic quality (IQ) with isotropic properties and improved fatigue strength due to higher cleanliness levels, and a finer size and distribution of non-metallic inclusions

 

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.

IQ-Steel® 

IQ-Steel® is an isotropic quality ultra clean steel optimized for high fatigue strength under multi axial loading.

 

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

Jominy hardenability according to ASTM A255. Average value with +/- standard deviation.

Steel cleanliness

Micro inclusions -  Steel grade 255G   Macro inclusions - 255G
Applied standard ASTM  45   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  
1.0 0.5 0.5 0.5 0 0 0.5 0.5  
 
Micro inclusions - Steel grade 255Q   Macro inclusions - 255Q
Applied standard DIN 50602  K1   Applied standard

10 M Hz UST

(Ovako internal standard)

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

< 10 defects/dm3

> 0,2 mm FBH

IQ

CCT

CCT

Carburizing

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.