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SAE-AISI 8645 Steel vs. Grade TDSiCrV Steel

Both SAE-AISI 8645 steel and grade TDSiCrV steel are iron alloys. They have a very high 99% of their average alloy composition in common. 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 8645 steel and the bottom bar is grade TDSiCrV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
630
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 600 to 670
2100

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
420
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 39
47
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.3
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
1.9
Embodied Energy, MJ/kg 20
26
Embodied Water, L/kg 50
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
75
Strength to Weight: Bending, points 20 to 22
47
Thermal Diffusivity, mm2/s 10
13
Thermal Shock Resistance, points 18 to 20
63

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.5 to 0.7
Chromium (Cr), % 0.4 to 0.6
0.5 to 1.0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 96.5 to 97.7
96.1 to 97.8
Manganese (Mn), % 0.75 to 1.0
0.4 to 0.9
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
1.2 to 1.7
Sulfur (S), % 0 to 0.040
0 to 0.020
Vanadium (V), % 0
0.1 to 0.25