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Material data sheet

Steel grade

Last revised: Thu, 23 Feb 2023 16:19:39 GMT

General Information

16NiCrS4 is an case hardening steel with good dimension stability, high toughness and improved machinability.

Ovako 146S is an ingot cast steel. The chemical composition is well controlled to give the steel a controlled hardenability towards the high end (HH). It has reduced silicon content for reduced propensity for internal oxidation during carburizing. Regulated sulphur content ensures good machinability properties.

4730 is an contious cast steel. The chemical composition is well controlled to give the steel a controlled hardenability towards the low end (HL). For improved machinability this steel is processed according to our M-Steel concept.


The basis for the concept is that non-metallic inclusions are modified and controlled with calcium treatment in a way to minimize tool wear and to maximize chip control in machining operations. Our M-Steel treatment can be applied to any steel grade. 

Similar designations

SS 2511, 16NCD5 (AFNOR), 637 A 16 (BS), 16NC6 (AFNOR), BS 637M17 M

146S: Jominy hardenability according to ASTM A255. Average value with +/- standard deviation.

EN ISO 683-3 data is showing the +H version. 

Heat treatment

Carburizing response


Tempering response

Fatigue properties

Steel cleanliness

Micro inclusions   Macro inclusions
Applied standard ASTM E45 Applied standard

ISO 3763

(Blue fracture)

Sampling ASTM A295 Sampling Statistical testing on billets

Maximum average


A B C D Limits < 5 mm/dm2
Th He Th He Th He Th He
2,5 1,5 1,0 0,5 0 0 0,5 0,5

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.