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Grade FDC Steel vs. Grade VDSiCr Steel

Both grade FDC steel and grade VDSiCr 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 FDC steel and the bottom bar is grade VDSiCr steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 510
590
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Reduction in Area, % 42
48
Shear Modulus, GPa 80
80
Tensile Strength: Ultimate (UTS), MPa 1680
1950

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
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
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
70
Strength to Weight: Bending, points 40
45
Thermal Diffusivity, mm2/s 14
12
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 0.12
0 to 0.060
Iron (Fe), % 98 to 99.4
96.6 to 97.8
Manganese (Mn), % 0.5 to 1.2
0.5 to 0.9
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.1 to 0.35
1.2 to 1.6
Sulfur (S), % 0 to 0.025
0 to 0.020