Ovako 18CrNiMo7-6 159Q Steel, Hardening

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Ovako 18CrNiMo7-6 159Q Steel, Hardening
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	Metric	English	Comments

Density	7.80 g/cc	0.282 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength	980 - 1270 MPa @Thickness 63.0 mm	142000 - 184000 psi @Thickness 2.48 in
	1080 - 1320 MPa @Thickness 30.0 mm	157000 - 191000 psi @Thickness 1.18 in
Tensile Strength, Yield	>= 690 MPa @Thickness 63.0 mm	>= 100000 psi @Thickness 2.48 in
	>= 780 MPa @Thickness 30.0 mm	>= 113000 psi @Thickness 1.18 in
Elongation at Break	8.0 % @Thickness 30.0 mm	8.0 % @Thickness 1.18 in
	8.0 % @Thickness 63.0 mm	8.0 % @Thickness 2.48 in
Modulus of Elasticity	210 GPa	30500 ksi
Poissons Ratio	0.30	0.30
Shear Modulus	80.0 GPa	11600 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000200 - 0.00000250 ohm-cm	0.00000200 - 0.00000250 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	12.0 µm/m-°C @Temperature 20.0 - 300 °C	6.67 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.460 - 0.480 J/g-°C @Temperature 50.0 - 100 °C	0.110 - 0.115 BTU/lb-°F @Temperature 122 - 212 °F
Thermal Conductivity	40.0 - 45.0 W/m-K	278 - 312 BTU-in/hr-ft²-°F	Ambient temperature
Transformation Temperature	410 °C	770 °F	MS
	726 °C	1340 °F	AC1
	833 °C	1530 °F	AC3

Component Elements Properties	Metric	English	Comments
Carbon, C	0.16 - 0.19 %	0.16 - 0.19 %
Chromium, Cr	1.6 - 1.8 %	1.6 - 1.8 %
Iron, Fe	94.99 - 95.79 %	94.99 - 95.79 %	As Balance
Manganese, Mn	0.50 - 0.60 %	0.50 - 0.60 %
Molybdenum, Mo	0.25 - 0.35 %	0.25 - 0.35 %
Nickel, Ni	1.5 - 1.7 %	1.5 - 1.7 %
Phosphorus, P	<= 0.015 %	<= 0.015 %
Silicon, Si	0.20 - 0.35 %	0.20 - 0.35 %
Sulfur, S	<= 0.0020 %	<= 0.0020 %

Descriptive Properties
Weldability	CEV 0.86_max
	Pcm 0.39_max

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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