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ASTM A369 Grade FPA vs. S20431 Stainless Steel

Both ASTM A369 grade FPA and S20431 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FPA and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 27
46
Fatigue Strength, MPa 180
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 240
500
Tensile Strength: Ultimate (UTS), MPa 380
710
Tensile Strength: Yield (Proof), MPa 240
350

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 400
890
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.5
Embodied Energy, MJ/kg 18
36
Embodied Water, L/kg 46
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
270
Resilience: Unit (Modulus of Resilience), kJ/m3 150
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 13
25
Strength to Weight: Bending, points 15
23
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 12
15

Alloy Composition

Carbon (C), % 0 to 0.25
0 to 0.12
Chromium (Cr), % 0
17 to 18
Copper (Cu), % 0
1.5 to 3.5
Iron (Fe), % 98.3 to 99.63
66.1 to 74.4
Manganese (Mn), % 0.27 to 0.93
5.0 to 7.0
Nickel (Ni), % 0
2.0 to 4.0
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.1 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.030