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Ovako 18CrNiMo7-6 159A 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 PropertiesOriginal ValueComments
Density 7.80 g/cc
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength 980 - 1270 MPa
@Thickness 63.0 mm
 1080 - 1320 MPa
@Thickness 30.0 mm
Tensile Strength, Yield >= 690 MPa
@Thickness 63.0 mm
 >= 780 MPa
@Thickness 30.0 mm
Elongation at Break 8.0 %
@Thickness 30.0 mm
 8.0 %
@Thickness 63.0 mm
Modulus of Elasticity 210 GPa
Poissons Ratio 0.30
Shear Modulus 80.0 GPa
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.00000200 - 0.00000250 ohm-cm
 
Thermal PropertiesOriginal ValueComments
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-KAmbient temperature
Transformation Temperature 410 °CMS
 726 °CAC1
 833 °CAC3
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.15 - 0.19 %
Chromium, Cr 1.6 - 1.8 %
Iron, Fe 94.69 - 95.9 %As Balance
Manganese, Mn 0.50 - 0.95 %
Molybdenum, Mo 0.25 - 0.35 %
Nickel, Ni 1.5 - 1.7 %
Phosphorus, P <= 0.015 %
Silicon, Si 0.10 - 0.30 %
Sulfur, S <= 0.0050 %
 
Descriptive Properties
WeldabilityCEV 0.91max
 Pcm 0.4max

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Ovako 18CrNiMo7-6 159Q Steel, Hardening

NOVAKO100 / 234399

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