SAE-AISI 4718 (G47180) Ni-Cr-Mo Steel
Alloy Steels
Property Overview
Density7.9g/cm³
Elastic Modulus190GPa
Tensile Strength510MPa
Yield Strength370MPa
Brinell Hardness150HB
Maximum Service Temperature420°C
Chemical Composition
C
0.16 to 0.21%
CR
0.35 to 0.55%
NI
0.9 to 1.2%
MO
0.3 to 0.4%
MN
0.7 to 0.9%
SI
0.15 to 0.35%
P
0 to 0.035%
S
0 to 0.040%
FE
96.3 to 97.4%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
24 %
Fatigue Strength
270 MPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Shear Strength
330 MPa
Tensile Strength: Ultimate (UTS)
510 MPa
Tensile Strength: Yield (Proof)
370 MPa
Hardness
Brinell Hardness
150
Physical
Density
7.9 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
420 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
39 W/m-K
Thermal Diffusivity
10 mm 2 /s
Thermal Expansion
11 µm/m-K
Thermal Shock Resistance
17 points
Electrical
Electrical Conductivity: Equal Volume
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m 3
Resilience: Unit (Modulus of Resilience)
360 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Environmental
Base Metal Price
3.0 % relative
Embodied Carbon
1.6 kg CO 2 /kg material
Embodied Energy
21 MJ/kg
Embodied Energy
21 MJ/kg 9.1 x 10 3 BTU/lb
Embodied Water
51 L/kg
Embodied Water
51 L/kg 6.1 gal/lb
Registered Designations & Aliases
G47180SAE-AISI 4718 (G47180) Ni-Cr-Mo Steel
Standards
ASTM A752 ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel