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Material data sheet

Steel grade

Last revised: Tue, 07 Feb 2023 13:41:02 GMT

General Information

40NiCrMo7-3 is a quench and tempering steel with high toughness. Used for large axles, machine componenets etc. that require high tensile strength and high toughness. Can be flame or induction hardened.

6514 in intended for ASTM A320 L43 fasteners in low-temperature service.

Ovako 355B The grade is inside the SAE 4340 specification but is slightly enhanced with Vanadium for improved tempering resistance. The grade has a low controlled sulphur content to ensure machinability yet with a high sulphidic cleanliness. Oxygen content is kept low for high oxidic cleanliness. The steel is of Bearing Quality cleanliness (BQ).

Through hardenability corresponding to a bar with approx. Ø100mm (oil quenching)

Delivered in as-rolled, soft annealed, normalized or quench and tempered condition

BQ-Steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

Similar designations

AISI 4340

Valid for variant 6514

Steel cleanliness

         Micro inclusions steel grade 355B        Macro inclusions steel grade 355B 
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   < 2,5 mm/dm  
Th  He  Th  He  Th  He  Th  He 
 2,0  1,5  0,8 0,1   0  0  0,5 0,4 

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.