SAE-AISI 4340 (SNCM439, G43400) Ni-Cr-Mo Steel
Alloy Steels
annealed
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength690MPa
Yield Strength470MPa
Brinell Hardness220HB
Maximum Service Temperature430°C
Chemical Composition
C
0.38 to 0.43%
CR
0.7 to 0.9%
NI
1.7 to 2.0%
MO
0.2 to 0.3%
MN
0.6 to 0.8%
SI
0.15 to 0.35%
P
0 to 0.035%
S
0 to 0.040%
FE
95.1 to 96.3%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
22 %
Fatigue Strength
330 MPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Shear Strength
430 MPa
Tensile Strength: Ultimate (UTS)
690 MPa
Tensile Strength: Yield (Proof)
470 MPa
Hardness
Brinell Hardness
220
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
430 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
44 W/m-K
Thermal Diffusivity
12 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
20 points
Electrical
Electrical Conductivity: Equal Volume
7.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m 3
Resilience: Unit (Modulus of Resilience)
590 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Environmental
Base Metal Price
3.5 % relative
Embodied Carbon
1.7 kg CO 2 /kg material
Embodied Energy
22 MJ/kg
Embodied Energy
22 MJ/kg 9.6 x 10 3 BTU/lb
Embodied Water
53 L/kg
Embodied Water
53 L/kg 6.4 gal/lb
Registered Designations & Aliases
G43400SAE-AISI 4340 (SNCM439, G43400) Ni-Cr-Mo SteelSNCM439
Standards
ASTM A752 ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel
ASTM A752 ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010 Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993