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Grade TDSiCr Steel vs. SAE-AISI 8645 Steel

Both grade TDSiCr steel and SAE-AISI 8645 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 grade TDSiCr steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 590
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
73
Tensile Strength: Ultimate (UTS), MPa 1950
600 to 670

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 410
410
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 46
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 48
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 70
21 to 24
Strength to Weight: Bending, points 45
20 to 22
Thermal Diffusivity, mm2/s 12
10
Thermal Shock Resistance, points 58
18 to 20

Alloy Composition

Carbon (C), % 0.5 to 0.6
0.43 to 0.48
Chromium (Cr), % 0.5 to 0.8
0.4 to 0.6
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 96.6 to 97.8
96.5 to 97.7
Manganese (Mn), % 0.5 to 0.9
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 1.2 to 1.6
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040