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Grade FDSiCr Steel vs. ASTM A387 Grade 91 Class 2

Both grade FDSiCr steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is grade FDSiCr steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 580
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 80
75
Tensile Strength: Ultimate (UTS), MPa 1930
670

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 410
600
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 48
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
37
Embodied Water, L/kg 48
88

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 69
24
Strength to Weight: Bending, points 44
22
Thermal Diffusivity, mm2/s 13
6.9
Thermal Shock Resistance, points 58
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0.5 to 0.6
0.080 to 0.12
Chromium (Cr), % 0.5 to 0.8
8.0 to 9.5
Copper (Cu), % 0 to 0.12
0
Iron (Fe), % 96.5 to 97.8
87.3 to 90.3
Manganese (Mn), % 0.5 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 1.2 to 1.6
0.2 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010