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ASTM A369 Grade FP21 vs. R60705 Alloy

ASTM A369 grade FP21 belongs to the iron alloys classification, while R60705 alloy belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is R60705 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
98
Elongation at Break, % 20
18
Fatigue Strength, MPa 160
290
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 74
37
Tensile Strength: Ultimate (UTS), MPa 470
540
Tensile Strength: Yield (Proof), MPa 240
430

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Specific Heat Capacity, J/kg-K 470
270
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 13
6.3

Otherwise Unclassified Properties

Density, g/cm3 7.8
6.7
Embodied Water, L/kg 61
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
90
Resilience: Unit (Modulus of Resilience), kJ/m3 150
950
Stiffness to Weight: Axial, points 13
8.1
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 17
22
Strength to Weight: Bending, points 17
22
Thermal Diffusivity, mm2/s 11
9.5
Thermal Shock Resistance, points 14
63

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.050
Chromium (Cr), % 2.7 to 3.4
0 to 0.2
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 94.3 to 96.2
0 to 0.2
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.8 to 1.1
0
Niobium (Nb), % 0
2.0 to 3.0
Nitrogen (N), % 0
0 to 0.025
Oxygen (O), % 0
0 to 0.18
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0
Zirconium (Zr), % 0
91 to 98