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Steel Grade Data for Engineers

This material data sheet provides information on the Cromobolt steel grade SB9240. It has the following key points: 1. Cromobolt SB9240 has a chemical composition that conforms to ISO 898-1 standards for fasteners with 8.8 or 10.9 properties. 2. It is suitable for quenching and tempering to achieve the required 90% martensite content up to diameters of 64mm. 3. The mechanical properties include a minimum yield strength of 940MPa and tensile strength between 1050-1140MPa after quenching and tempering.

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Yonas Dwiananta Yuwono
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715 views2 pages

Steel Grade Data for Engineers

This material data sheet provides information on the Cromobolt steel grade SB9240. It has the following key points: 1. Cromobolt SB9240 has a chemical composition that conforms to ISO 898-1 standards for fasteners with 8.8 or 10.9 properties. 2. It is suitable for quenching and tempering to achieve the required 90% martensite content up to diameters of 64mm. 3. The mechanical properties include a minimum yield strength of 940MPa and tensile strength between 1050-1140MPa after quenching and tempering.

Uploaded by

Yonas Dwiananta Yuwono
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Material data sheet Cromobolt

Steel grade SB9240


Last revised: Wed, 07 Jun 2017 09:15:31 GMT

42CrMo6* All

General Information
The chemical composition of 42CrMo6*, CROMOBOLT, conforms to the requirements in ISO 898-1:2013 for fasteners to 8.8 or 10.9 properties.
The material is suitable for quenching and tempering to 8.8 or 10.9 properties. Required 90% martensite in the core area of the material is achieved
up to 64 mm diameter by oil quenching.
* Designation followed by "*" is not an official EN standard grade but named according to the rules in EN 10027.

Similar designations
Cromobolt

Chemical composition
Variant Cast Di Weldability C% Si % Mn % P% S% Cr % Ni % Mo % Cu % Al %
CEV 0.9max Min 0.40 0.15 0.80 - - 1.20 0.35 0.30 - 0.015
SB9240 CC
Pcm 0.57max Max 0.44 0.35 1.00 0.015 0.015 1.30 0.45 0.35 0.25 0.035
CEV 0.94max Min 0.40 0.15 0.75 - - 1.40 - 0.15 - -
Cromobolt, 6116 CC 8.44
Pcm 0.58max Max 0.45 0.35 0.90 0.025 0.025 1.60 - 0.30 - -

Mechanical Properties
Dimension Yield strength min Tensile strength Elongation A5 Reduction of area Impact (ISO-V)
Variant Condition Format Hardness
[mm] [MPa] [MPa] [%] Zmin [%] strengthmin
Round
SB9240 +QT 15 < 64 940** 1050-1140 9 - - -
bar
Cromobolt, Round
+QT < 80 940 1040-1200 9 48 304-361 HB -40 °C 27 J (long)
6116 bar
Rp0.2 * Reh, ** Rel

Transformation temperatures
Temperature °C
MS 311
AC1 747
AC3 793

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 Specific heat capacity 50/100°C Thermal conductivity Ambient Electrical resistivityAmbient temperature
(µm/m°K) (J/kg°K) temperature (W/m°K) (µΩm)
12 460 - 480 40 - 45 0.20 - 0.25

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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.

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