ASTM A369 Grade FP21 vs. SAE-AISI 4620 Steel
Both ASTM A369 grade FP21 and SAE-AISI 4620 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is SAE-AISI 4620 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 140 | |
150 to 210 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 20 | |
16 to 27 |
Fatigue Strength, MPa | 160 | |
260 to 360 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 74 | |
73 |
Shear Strength, MPa | 300 | |
320 to 420 |
Tensile Strength: Ultimate (UTS), MPa | 470 | |
490 to 680 |
Tensile Strength: Yield (Proof), MPa | 240 | |
350 to 550 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
250 |
Maximum Temperature: Mechanical, °C | 470 | |
410 |
Melting Completion (Liquidus), °C | 1470 | |
1460 |
Melting Onset (Solidus), °C | 1430 | |
1420 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 41 | |
47 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
7.3 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
8.4 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 4.0 | |
3.2 |
Density, g/cm3 | 7.8 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 1.8 | |
1.6 |
Embodied Energy, MJ/kg | 23 | |
22 |
Embodied Water, L/kg | 61 | |
50 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
100 to 120 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
330 to 800 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 17 | |
17 to 24 |
Strength to Weight: Bending, points | 17 | |
18 to 22 |
Thermal Diffusivity, mm2/s | 11 | |
13 |
Thermal Shock Resistance, points | 14 | |
15 to 20 |
Alloy Composition
Carbon (C), % | 0.050 to 0.15 | |
0.17 to 0.22 |
Chromium (Cr), % | 2.7 to 3.4 | |
0 |
Iron (Fe), % | 94.3 to 96.2 | |
96.4 to 97.4 |
Manganese (Mn), % | 0.3 to 0.6 | |
0.45 to 0.65 |
Molybdenum (Mo), % | 0.8 to 1.1 | |
0.2 to 0.3 |
Nickel (Ni), % | 0 | |
1.7 to 2.0 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.035 |
Silicon (Si), % | 0 to 0.5 | |
0.15 to 0.35 |
Sulfur (S), % | 0 to 0.025 | |
0 to 0.040 |