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S43940 Stainless Steel vs. ASTM A369 Grade FPA

Both S43940 stainless steel and ASTM A369 grade FPA are iron alloys. They have 81% 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 S43940 stainless steel and the bottom bar is ASTM A369 grade FPA.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
110
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 21
27
Fatigue Strength, MPa 180
180
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 310
240
Tensile Strength: Ultimate (UTS), MPa 490
380
Tensile Strength: Yield (Proof), MPa 280
240

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 890
400
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
52
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.4
Embodied Energy, MJ/kg 38
18
Embodied Water, L/kg 120
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
89
Resilience: Unit (Modulus of Resilience), kJ/m3 200
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
13
Strength to Weight: Bending, points 18
15
Thermal Diffusivity, mm2/s 6.8
14
Thermal Shock Resistance, points 18
12

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.25
Chromium (Cr), % 17.5 to 18.5
0
Iron (Fe), % 78.2 to 82.1
98.3 to 99.63
Manganese (Mn), % 0 to 1.0
0.27 to 0.93
Niobium (Nb), % 0.3 to 0.6
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.1 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.035
Titanium (Ti), % 0.1 to 0.6
0