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SAE-AISI 4340M Steel vs. ACI-ASTM CA28MWV Steel

Both SAE-AISI 4340M steel and ACI-ASTM CA28MWV steel are iron alloys. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (6, 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 CA28MWV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
11
Fatigue Strength, MPa 690
470
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 2340
1080
Tensile Strength: Yield (Proof), MPa 1240
870

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 430
740
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
4.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
5.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
11
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
3.1
Embodied Energy, MJ/kg 26
44
Embodied Water, L/kg 55
100

Common Calculations

PREN (Pitting Resistance) 2.2
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1920
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
38
Strength to Weight: Bending, points 51
30
Thermal Diffusivity, mm2/s 10
6.6
Thermal Shock Resistance, points 70
40

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.2 to 0.28
Chromium (Cr), % 0.7 to 1.0
11 to 12.5
Iron (Fe), % 93.3 to 94.8
81.4 to 85.8
Manganese (Mn), % 0.65 to 0.9
0.5 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0.9 to 1.3
Nickel (Ni), % 1.7 to 2.0
0.5 to 1.0
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0.050 to 0.1
0.2 to 0.3