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ASTM A369 Grade FP21 vs. SAE-AISI 1090 Steel

Both ASTM A369 grade FP21 and SAE-AISI 1090 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 (2, 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 1090 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
220 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
11
Fatigue Strength, MPa 160
320 to 380
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
72
Shear Strength, MPa 300
470 to 570
Tensile Strength: Ultimate (UTS), MPa 470
790 to 950
Tensile Strength: Yield (Proof), MPa 240
520 to 610

Thermal Properties

Latent Heat of Fusion, J/g 260
240
Maximum Temperature: Mechanical, °C 470
400
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
50
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 23
19
Embodied Water, L/kg 61
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
82 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 150
730 to 1000
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
28 to 34
Strength to Weight: Bending, points 17
24 to 27
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 14
25 to 31

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.85 to 1.0
Chromium (Cr), % 2.7 to 3.4
0
Iron (Fe), % 94.3 to 96.2
98 to 98.6
Manganese (Mn), % 0.3 to 0.6
0.6 to 0.9
Molybdenum (Mo), % 0.8 to 1.1
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0 to 0.050