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ASTM A369 Grade FP9 vs. AISI 420F Stainless Steel

Both ASTM A369 grade FP9 and AISI 420F stainless steel are iron alloys. Both are furnished in the annealed condition. They have a very high 95% of their average alloy composition in common. There are 32 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 FP9 and the bottom bar is AISI 420F stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
18
Fatigue Strength, MPa 160
270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Shear Strength, MPa 300
460
Tensile Strength: Ultimate (UTS), MPa 470
740
Tensile Strength: Yield (Proof), MPa 240
430

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 600
760
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 10
3.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
7.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.0
Embodied Energy, MJ/kg 28
28
Embodied Water, L/kg 87
100

Common Calculations

PREN (Pitting Resistance) 12
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
480
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
27
Strength to Weight: Bending, points 17
23
Thermal Diffusivity, mm2/s 6.9
6.8
Thermal Shock Resistance, points 13
27

Alloy Composition

Carbon (C), % 0 to 0.15
0.3 to 0.4
Chromium (Cr), % 8.0 to 10
12 to 14
Iron (Fe), % 87.1 to 90.3
82.4 to 87.6
Manganese (Mn), % 0.3 to 0.6
0 to 1.3
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.5 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35