MakeItFrom.com
Menu (ESC)

SAE-AISI 4340M Steel vs. ACI-ASTM CG8M Steel

Both SAE-AISI 4340M steel and ACI-ASTM CG8M steel are iron alloys. They have 69% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
45
Fatigue Strength, MPa 690
280
Impact Strength: V-Notched Charpy, J 18
110
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 2340
550
Tensile Strength: Yield (Proof), MPa 1240
300

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1020
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
4.1
Embodied Energy, MJ/kg 26
56
Embodied Water, L/kg 55
160

Common Calculations

PREN (Pitting Resistance) 2.2
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
210
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
220
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
19
Strength to Weight: Bending, points 51
19
Thermal Diffusivity, mm2/s 10
4.3
Thermal Shock Resistance, points 70
12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.7 to 1.0
18 to 21
Iron (Fe), % 93.3 to 94.8
58.8 to 70
Manganese (Mn), % 0.65 to 0.9
0 to 1.5
Molybdenum (Mo), % 0.35 to 0.45
3.0 to 4.0
Nickel (Ni), % 1.7 to 2.0
9.0 to 13
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.5
Sulfur (S), % 0 to 0.012
0 to 0.040
Vanadium (V), % 0.050 to 0.1
0