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Material data sheet

Steel grade

Last revised: Mon, 27 Nov 2023 15:18:57 GMT

General Information

C55 is a carbon steel for general purposes found in three variants in EN ISO 683-1. 

510A is an ingot casted steel. High hardness (approx. 60HRC) and high strength can be achieved after hardening due to the relatively high carbon content. The steel is suitable for various type of applications where high strength is needed

056K is a low alloyed steel for quench and tempering. Used for machine parts etc. Can be induction or flame hardened

8665 is a continuous casted variant meeting all three of the EN ISO standards.  


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

Similar designations

C54, C55E - 1.1203, C55R - 1.1209, 070M55 (BS970), ASTM/SAE 1055, SS 1655, C55R, Cf53, 1.1213

Cr+Ni+Mo ≤ 0.63

Data valid for Ovako 510A.

C55 ISO 683-1 shows the Jominy band for C55E/C55R +H


Steel cleanliness

Micro inclusions - 510A   Macro inclusions - 510A
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 1.5 0.5 0 0 1.0 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.