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SAE-AISI 4340M Steel vs. C69400 Brass

SAE-AISI 4340M steel belongs to the iron alloys classification, while C69400 brass belongs to the copper alloys. There are 29 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 C69400 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 6.0
17
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
42
Shear Strength, MPa 1360
350
Tensile Strength: Ultimate (UTS), MPa 2340
570
Tensile Strength: Yield (Proof), MPa 1240
270

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 430
170
Melting Completion (Liquidus), °C 1440
920
Melting Onset (Solidus), °C 1400
820
Specific Heat Capacity, J/kg-K 480
410
Thermal Conductivity, W/m-K 38
26
Thermal Expansion, µm/m-K 13
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
6.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
27
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 1.9
2.7
Embodied Energy, MJ/kg 26
44
Embodied Water, L/kg 55
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
80
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
340
Stiffness to Weight: Axial, points 13
7.4
Stiffness to Weight: Bending, points 25
19
Strength to Weight: Axial, points 84
19
Strength to Weight: Bending, points 51
18
Thermal Diffusivity, mm2/s 10
7.7
Thermal Shock Resistance, points 70
20

Alloy Composition

Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.7 to 1.0
0
Copper (Cu), % 0
80 to 83
Iron (Fe), % 93.3 to 94.8
0 to 0.2
Lead (Pb), % 0
0 to 0.3
Manganese (Mn), % 0.65 to 0.9
0
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0
Silicon (Si), % 1.5 to 1.8
3.5 to 4.5
Sulfur (S), % 0 to 0.012
0
Vanadium (V), % 0.050 to 0.1
0
Zinc (Zn), % 0
11.5 to 16.5
Residuals, % 0
0 to 0.5