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Grade VDC Steel vs. Grade FDSiCr Steel

Both grade VDC steel and grade FDSiCr steel are iron alloys. Both are furnished in the hardened (H) condition. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is grade VDC steel and the bottom bar is grade FDSiCr steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 510
580
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Reduction in Area, % 50
42
Shear Modulus, GPa 80
80
Tensile Strength: Ultimate (UTS), MPa 1700
1930

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
48
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.2
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 47
48

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 60
69
Strength to Weight: Bending, points 40
44
Thermal Diffusivity, mm2/s 14
13
Thermal Shock Resistance, points 50
58

Alloy Composition

Carbon (C), % 0.6 to 0.75
0.5 to 0.6
Chromium (Cr), % 0 to 0.3
0.5 to 0.8
Copper (Cu), % 0 to 0.060
0 to 0.12
Iron (Fe), % 98.3 to 99.35
96.5 to 97.8
Manganese (Mn), % 0.5 to 1.0
0.5 to 0.9
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0.15 to 0.3
1.2 to 1.6
Sulfur (S), % 0 to 0.020
0 to 0.025