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SAE-AISI 1038 Steel vs. S43940 Stainless Steel

Both SAE-AISI 1038 steel and S43940 stainless steel 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 (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1038 steel and the bottom bar is S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 20
21
Fatigue Strength, MPa 220 to 350
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 370 to 390
310
Tensile Strength: Ultimate (UTS), MPa 590 to 640
490
Tensile Strength: Yield (Proof), MPa 320 to 540
280

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 400
890
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
3.4

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
2.6
Embodied Energy, MJ/kg 18
38
Embodied Water, L/kg 46
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 100
86
Resilience: Unit (Modulus of Resilience), kJ/m3 270 to 790
200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 23
18
Strength to Weight: Bending, points 20 to 21
18
Thermal Diffusivity, mm2/s 14
6.8
Thermal Shock Resistance, points 19 to 20
18

Alloy Composition

Carbon (C), % 0.35 to 0.42
0 to 0.030
Chromium (Cr), % 0
17.5 to 18.5
Iron (Fe), % 98.6 to 99.05
78.2 to 82.1
Manganese (Mn), % 0.6 to 0.9
0 to 1.0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6