Ovako 18CrNiMo7-6 4761 MbCN 216 Steel, +A

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Ovako 18CrNiMo7-6 4761 MbCN 216 Steel, +A
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel
Material Notes:	General Information: 18CrNiMo7-6 is a case hardening steel with high toughness. There are a number of variants with high cleanliness requirements. All variants possess tighter composition ranges compared to the standard. One variant is produced with the quality class IQ (isotropic quality). This ensures a very low number of elongated sulphide inclusions which will give more isotropic properties. The high oxidic cleanliness will enable the steel to meet the same high cleanliness demands as for re-melted qualities. Grade 159A - Variant with low sulphur content and high cleanliness demands Grade 159B - Variant with controlled sulphur content for consistent machinability and +H hardenability Grade 159Q - Isotropic properties (IQ) and better fatigue strength due to higher cleanliness levels, and a finer size and distribution of non-metallic inclusions Grade 159X - Variant with controlled sulphur content for consistent machinability and +H hardenability Grade 159S - Variant with increased sulphur content. Grade 4761(MoCN216) - Low sulphur variant of ImatraIQ-SteelIQ-Steel® is an isotropic quality ultra clean steel optimized for high fatigue strength under multi axial loading. Information provided by Ovako
Key Words:	1.6587, AISI4820, DIN17CrNiMo6, 18CND6
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Physical Properties	Original Value	Comments

Density	7.80 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	<= 229 @Thickness 25.0 - 160 mm
Modulus of Elasticity	210 GPa
Poissons Ratio	0.30
Shear Modulus	80.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000200 - 0.00000250 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	12.0 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.460 - 0.480 J/g-°C @Temperature 50.0 - 100 °C
Thermal Conductivity	40.0 - 45.0 W/m-K	Ambient temperature
Transformation Temperature	410 °C	MS
	726 °C	AC1
	833 °C	AC3

Component Elements Properties	Original Value	Comments
Carbon, C	0.15 - 0.21 %
Chromium, Cr	1.5 - 1.8 %
Iron, Fe	94.61 - 96.1 %	As Balance
Manganese, Mn	0.50 - 0.90 %
Molybdenum, Mo	0.25 - 0.35 %
Nickel, Ni	1.4 - 1.7 %
Phosphorus, P	0.00 - 0.015 %
Silicon, Si	0.10 - 0.40 %
Sulfur, S	<= 0.015 %

Descriptive Properties
Weldability	CEV 0.79_max
	Pcm 0.36_max

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