SAE-AISI 4140 (SCM440, G41400) Cr-Mo Steel
Alloy Steels
annealed
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength740MPa
Yield Strength660MPa
Brinell Hardness200HB
Maximum Service Temperature420°C
Chemical Composition
C
0.38 to 0.43%
CR
0.8 to 1.1%
MO
0.15 to 0.25%
MN
0.75 to 1.0%
SI
0.15 to 0.35%
P
0 to 0.035%
S
0 to 0.040%
FE
96.8 to 97.8%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
26 %
Fatigue Strength
480 MPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Shear Strength
470 MPa
Tensile Strength: Ultimate (UTS)
740 MPa
Tensile Strength: Yield (Proof)
660 MPa
Hardness
Brinell Hardness
200
Physical
Density
7.8 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
43 W/m-K
Thermal Diffusivity
12 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
22 points
Electrical
Electrical Conductivity: Equal Volume
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
180 MJ/m 3
Resilience: Unit (Modulus of Resilience)
1140 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Environmental
Base Metal Price
2.4 % relative
Embodied Carbon
1.5 kg CO 2 /kg material
Embodied Energy
20 MJ/kg
Embodied Energy
20 MJ/kg 8.5 x 10 3 BTU/lb
Embodied Water
51 L/kg
Embodied Water
51 L/kg 6.1 gal/lb
Registered Designations & Aliases
G41400SAE-AISI 4140 (SCM440, G41400) Cr-Mo SteelSCM440
Standards
ASTM A322 ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
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 ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades 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