EN 1.7709 (21CrMoV5-7) Steel
Other Steels
quenched and tempered
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength780MPa
Yield Strength620MPa
Brinell Hardness230HB
Maximum Service Temperature440°C
Chemical Composition
C
0.17 to 0.25%
CR
1.2 to 1.5%
NI
0 to 0.6%
MO
0.55 to 0.8%
MN
0.4 to 0.8%
SI
0 to 0.4%
P
0 to 0.025%
S
0 to 0.030%
V
0.2 to 0.35%
AL
0 to 0.030%
FE
95.2 to 97.5%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
18 %
Fatigue Strength
410 MPa
Impact Strength: V-Notched Charpy
71 J
Poisson's Ratio
0.29
Reduction in Area
68 %
Shear Modulus
73 GPa
Shear Strength
480 MPa
Tensile Strength: Ultimate (UTS)
780 MPa
Tensile Strength: Yield (Proof)
620 MPa
Hardness
Brinell Hardness
230
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
440 °C
Melting Completion (Liquidus)
1470 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
33 W/m-K
Thermal Diffusivity
8.9 mm 2 /s
Thermal Expansion
11 µm/m-K
Thermal Shock Resistance
26 points
Electrical
Electrical Conductivity: Equal Volume
7.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Calculated
PREN (Pitting Resistance)
3.6
Resilience: Ultimate (Unit Rupture Work)
130 MJ/m 3
Resilience: Unit (Modulus of Resilience)
1000 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
27 points
Strength to Weight: Bending
24 points
Environmental
Base Metal Price
3.4 % relative
Embodied Carbon
2.3 kg CO 2 /kg material
Embodied Energy
32 MJ/kg
Embodied Energy
32 MJ/kg 14 x 10 3 BTU/lb
Embodied Water
56 L/kg
Embodied Water
56 L/kg 6.7 gal/lb
Registered Designations & Aliases
1.77091.770921CrMoV5-721CrMoV5-7EN 1.7709 (21CrMoV5-7) Steel
Standards
EN 10269 EN 10269: 1999 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10269 EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10269 EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties Creep-Resistant Steels, Fujio Abe et al. (editors), 2008 Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005