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SAE-AISI 4140 Steel vs. Grade TDSiCr Steel

Both SAE-AISI 4140 steel and grade TDSiCr steel are iron alloys. Their average alloy composition is basically identical. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is grade TDSiCr steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
590
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
1950

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
410
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.2
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 51
48

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 38
70
Strength to Weight: Bending, points 22 to 30
45
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 20 to 32
58

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.5 to 0.6
Chromium (Cr), % 0.8 to 1.1
0.5 to 0.8
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 96.8 to 97.8
96.6 to 97.8
Manganese (Mn), % 0.75 to 1.0
0.5 to 0.9
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
1.2 to 1.6
Sulfur (S), % 0 to 0.040
0 to 0.020