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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