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SAE-AISI 4340 Steel vs. C87800 Brass

SAE-AISI 4340 steel belongs to the iron alloys classification, while C87800 brass belongs to the copper alloys. There are 28 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 4340 steel and the bottom bar is C87800 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 12 to 22
25
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
42
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
590
Tensile Strength: Yield (Proof), MPa 470 to 1150
350

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 430
170
Melting Completion (Liquidus), °C 1460
920
Melting Onset (Solidus), °C 1420
820
Specific Heat Capacity, J/kg-K 470
410
Thermal Conductivity, W/m-K 44
28
Thermal Expansion, µm/m-K 13
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
6.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
7.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
27
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 1.7
2.7
Embodied Energy, MJ/kg 22
44
Embodied Water, L/kg 53
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
130
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
540
Stiffness to Weight: Axial, points 13
7.4
Stiffness to Weight: Bending, points 24
19
Strength to Weight: Axial, points 24 to 45
20
Strength to Weight: Bending, points 22 to 33
19
Thermal Diffusivity, mm2/s 12
8.3
Thermal Shock Resistance, points 20 to 38
21

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Antimony (Sb), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.050
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.7 to 0.9
0
Copper (Cu), % 0
80 to 84.2
Iron (Fe), % 95.1 to 96.3
0 to 0.15
Lead (Pb), % 0
0 to 0.15
Magnesium (Mg), % 0
0 to 0.010
Manganese (Mn), % 0.6 to 0.8
0 to 0.15
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.010
Silicon (Si), % 0.15 to 0.35
3.8 to 4.2
Sulfur (S), % 0 to 0.040
0 to 0.050
Tin (Sn), % 0
0 to 0.25
Zinc (Zn), % 0
12 to 16
Residuals, % 0
0 to 0.5