EN 1.7321 (20MoCr4) Chromium-Molybdenum Steel
Other Steels
ferrite-pearlite annealed (FP)
Property Overview
Density7.9g/cm³
Elastic Modulus190GPa
Tensile Strength540MPa
Yield StrengthUnknown
Brinell Hardness160HB
Maximum Service Temperature410°C
Chemical Composition
C
0.17 to 0.23%
CR
0.3 to 0.6%
MO
0.4 to 0.5%
MN
0.7 to 1.0%
SI
0 to 0.3%
P
0 to 0.025%
S
0 to 0.025%
CU
0 to 0.25%
FE
97.1 to 98.4%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Tensile Strength: Ultimate (UTS)
540 MPa
Hardness
Brinell Hardness
160
Physical
Density
7.9 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
410 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
45 W/m-K
Thermal Diffusivity
12 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
16 points
Electrical
Electrical Conductivity: Equal Volume
7.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.3 % IACS
Calculated
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
19 points
Environmental
Base Metal Price
2.5 % relative
Embodied Carbon
1.5 kg CO 2 /kg material
Embodied Energy
20 MJ/kg
Embodied Energy
20 MJ/kg 8.7 x 10 3 BTU/lb
Embodied Water
50 L/kg
Embodied Water
50 L/kg 5.9 gal/lb
Registered Designations & Aliases
1.73211.732120MoCr420MoCr4EN 1.7321 (20MoCr4) Chromium-Molybdenum Steel
Standards
EN 10084 EN 10084: 2008 Case hardening steels. Technical delivery conditions
EN 10263-3 EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels
EN 10263-3 EN 10263-3: Steel rod, bars and wire for cold heading and cold extrusion - Part 3: Technical delivery conditions for case hardening steels