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SAE-AISI 4340 Steel vs. ACI-ASTM CB30 Steel

Both SAE-AISI 4340 steel and ACI-ASTM CB30 steel are iron alloys. They have 80% of their average alloy composition in common. There are 27 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 4340 steel and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
500
Tensile Strength: Yield (Proof), MPa 470 to 1150
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 430
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
21
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.7
2.3
Embodied Energy, MJ/kg 22
33
Embodied Water, L/kg 53
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
18
Strength to Weight: Bending, points 22 to 33
18
Thermal Diffusivity, mm2/s 12
5.6
Thermal Shock Resistance, points 20 to 38
17

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.3
Chromium (Cr), % 0.7 to 0.9
18 to 21
Copper (Cu), % 0
0 to 1.2
Iron (Fe), % 95.1 to 96.3
72.9 to 82
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0 to 2.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040