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SAE-AISI 4140 Steel vs. AWS BAu-1

SAE-AISI 4140 steel belongs to the iron alloys classification, while AWS BAu-1 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is AWS BAu-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 73
40
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
210

Thermal Properties

Latent Heat of Fusion, J/g 250
150
Melting Completion (Liquidus), °C 1460
1020
Melting Onset (Solidus), °C 1420
990
Specific Heat Capacity, J/kg-K 470
290
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Density, g/cm3 7.8
13

Common Calculations

Stiffness to Weight: Axial, points 13
4.7
Stiffness to Weight: Bending, points 24
12
Strength to Weight: Axial, points 25 to 38
4.5
Strength to Weight: Bending, points 22 to 30
6.1
Thermal Shock Resistance, points 20 to 32
8.5

Alloy Composition

Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.8 to 1.1
0
Copper (Cu), % 0
61.9 to 63
Gold (Au), % 0
37 to 38
Iron (Fe), % 96.8 to 97.8
0
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Residuals, % 0
0 to 0.15