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Material data sheet

Steel grade

Last revised: Fri, 17 Jun 2022 12:30:48 GMT

General Information

Ovako 225 is a steel specially designed for nitriding but is also suitable for carburizing or applications requiring quenched and tempered steels.

  • High nitriding rate
  • Suitable for nitriding, case carburizing or quench and tempering
  • Also suitable for applications require quenched and tempered steel in bars with diameter 25-160 mm.
  • Weldable under certain conditions

Variant 225A  -  Standard quality
Variant 225C  -  With a reduced sulphur content for a reduced number of sulphide inclusions 


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

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

Jominy hardenability according to ASTM A255. The graph shows the average values and standard deviation for 225A and range for 25CrMo4 according to EN 10083:2006. Same graph also valid for 225C.


Tempering response

Carburizing response

Nitriding response

Steel cleanliness

Micro inclusions - Ovako 225C  



Macro inclusions - Ovako 225C
Applied standard ASTM E45 Applied standard

ISO 3763

(Blue fracture)

Sampling ASTM A295 Sampling Statistical testing on billets




A B C D Limits < 5.0 mm/dm2
Th He Th He Th He Th He









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

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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.